Engineering Structures最新文献_第7页

Experimental study on the interfacial shear performance between macro basalt fibers reinforced UHPC as repair material and normal concrete

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-03-08 DOI: 10.1016/j.engstruct.2025.120044

Zhiyuan Chen , Xin Wang , Lining Ding , Kaidi Jiang , Fusheng Niu , Hua Wang , Zhishen Wu

The novel ultra high performance concrete (UHPC) reinforced with macro basalt fibers (MBFs), which has better performance of fiber distribution, electrochemical corrosion resistance and chloride resistance after cracking compared to UHPC with steel fibers, conforms to reinforce or repair marine structures. The interfacial performance between UHPC with MBFs and normal concrete (NC) urgently needs to be studied. Six kinds of UHPC, which were reinforced with MBFs, steel fibers and polypropylene (PP) fibers with various contents, were designed. A Double-sided direct shear test was conducted to study the effects of fibers in UHPC on the interfacial performance between UHPC and NC with different interface treatments. According to the test results, the interfacial shear strength (IFSS) between UHPC and NC increased and gradually approached the upper limit with the increasing fiber-UHPC bonding strength, content, aspect ratio and modulus of fibers. The interfaces processing method had a more significant influence on the IFSS compared to the fibers in UHPC. The group with two grooves had the highest IFSS of 6.57 MPa, representing a 242 % increase compared to the group with smooth interfaces. Semi empirical formulas fully considering the effects of fibers in UHPC were proposed based on tests results and cohesion, and it showed a reliable calculation accuracy with the prediction errors of most groups which were less than 15 %.

{"title":"Experimental study on the interfacial shear performance between macro basalt fibers reinforced UHPC as repair material and normal concrete","authors":"Zhiyuan Chen , Xin Wang , Lining Ding , Kaidi Jiang , Fusheng Niu , Hua Wang , Zhishen Wu","doi":"10.1016/j.engstruct.2025.120044","DOIUrl":"10.1016/j.engstruct.2025.120044","url":null,"abstract":"<div><div>The novel ultra high performance concrete (UHPC) reinforced with macro basalt fibers (MBFs), which has better performance of fiber distribution, electrochemical corrosion resistance and chloride resistance after cracking compared to UHPC with steel fibers, conforms to reinforce or repair marine structures. The interfacial performance between UHPC with MBFs and normal concrete (NC) urgently needs to be studied. Six kinds of UHPC, which were reinforced with MBFs, steel fibers and polypropylene (PP) fibers with various contents, were designed. A Double-sided direct shear test was conducted to study the effects of fibers in UHPC on the interfacial performance between UHPC and NC with different interface treatments. According to the test results, the interfacial shear strength (IFSS) between UHPC and NC increased and gradually approached the upper limit with the increasing fiber-UHPC bonding strength, content, aspect ratio and modulus of fibers. The interfaces processing method had a more significant influence on the IFSS compared to the fibers in UHPC. The group with two grooves had the highest IFSS of 6.57 MPa, representing a 242 % increase compared to the group with smooth interfaces. Semi empirical formulas fully considering the effects of fibers in UHPC were proposed based on tests results and cohesion, and it showed a reliable calculation accuracy with the prediction errors of most groups which were less than 15 %.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 120044"},"PeriodicalIF":5.6,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advancing the non-local damage approach for reinforced concrete structures: The Extended Gradient Damage Model

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-03-07 DOI: 10.1016/j.engstruct.2025.119970

Liang Xue , Ye Feng , Lu Hai , Xiaodan Ren , Jie Li

Objective simulation of reinforced concrete (RC) structure, which is insensitive to the mesh size and orientation, is still a challenging task in engineering. In response, this study combines the extended gradient damage (EGD) model with energy decomposition, focusing on predicting the failure behavior of RC with openings. The EGD model adopts a strategy of decoupling the cohesive laws and the damage evolution, thus solving the damage unloading problem inherent in the phase-field models and the gradient-enhanced damage models. Additionally, the EGD model allows for the flexible assignment of tensile and shear mechanical properties to materials. This flexibility eliminates the constraint in the fracture phase-field model that requires the tensile fracture energy to equal the shear fracture energy, thereby enabling more accurate predictions of failure in engineering structures. Since the EGD model diffuses the crack into a damage band that spans multiple elements, the prediction results are independent of the mesh size and shape. Complex fracture patterns can also be reproduced through energy decomposition. In order to efficiently model and predict the failure of RC structures, an explicitly parallel numerical algorithm is developed in this study and integrated into the commercial software ABAQUS. Finally, through a series of numerical examples, it is demonstrated that the EGD model can effectively predict the crack path and global response of RC structures.

{"title":"Advancing the non-local damage approach for reinforced concrete structures: The Extended Gradient Damage Model","authors":"Liang Xue , Ye Feng , Lu Hai , Xiaodan Ren , Jie Li","doi":"10.1016/j.engstruct.2025.119970","DOIUrl":"10.1016/j.engstruct.2025.119970","url":null,"abstract":"<div><div>Objective simulation of reinforced concrete (RC) structure, which is insensitive to the mesh size and orientation, is still a challenging task in engineering. In response, this study combines the extended gradient damage (EGD) model with energy decomposition, focusing on predicting the failure behavior of RC with openings. The EGD model adopts a strategy of decoupling the cohesive laws and the damage evolution, thus solving the damage unloading problem inherent in the phase-field models and the gradient-enhanced damage models. Additionally, the EGD model allows for the flexible assignment of tensile and shear mechanical properties to materials. This flexibility eliminates the constraint in the fracture phase-field model that requires the tensile fracture energy to equal the shear fracture energy, thereby enabling more accurate predictions of failure in engineering structures. Since the EGD model diffuses the crack into a damage band that spans multiple elements, the prediction results are independent of the mesh size and shape. Complex fracture patterns can also be reproduced through energy decomposition. In order to efficiently model and predict the failure of RC structures, an explicitly parallel numerical algorithm is developed in this study and integrated into the commercial software ABAQUS. Finally, through a series of numerical examples, it is demonstrated that the EGD model can effectively predict the crack path and global response of RC structures.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 119970"},"PeriodicalIF":5.6,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Behavior of shear connection in web-embedded U-shaped steel-concrete composite beams: Experimental and numerical study

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-03-07 DOI: 10.1016/j.engstruct.2025.120020

Wenxu Yan , Yuanlong Yang , Guobiao Lou , Yohchia Frank Chen

This paper presents a study on the longitudinal shear connection of a web-embedded U-shaped steel-concrete composite beam (WUSCCB). A push-out test of nine specimens was conducted, and a longitudinal shear bearing mechanism of WUSCCB flange-web interface was proposed. Different from conventional steel-concrete composite beams, the longitudinal shear force at WUSCCB flange-web interface is contributed by both the local compression between shear connectors and surrounding concrete and the longitudinal shear of concrete flange. A finite element analysis was also conducted, revealing the shear mechanism of embedded shear connectors. Subsequently, a parametric analysis including 39 models was carried out to investigate the effects of concrete strength and connector details on the shear resistance behavior, revealing that the width and thickness of connectors are the crucial factors of shear capacity. Based on the test and parametric analysis results, a shear connection design method is proposed. Finally, a finite element model of WUSCCB was developed to verify the design method by examining the relationship between WUSCCB flexural behavior and shear connection degree.

{"title":"Behavior of shear connection in web-embedded U-shaped steel-concrete composite beams: Experimental and numerical study","authors":"Wenxu Yan , Yuanlong Yang , Guobiao Lou , Yohchia Frank Chen","doi":"10.1016/j.engstruct.2025.120020","DOIUrl":"10.1016/j.engstruct.2025.120020","url":null,"abstract":"<div><div>This paper presents a study on the longitudinal shear connection of a web-embedded U-shaped steel-concrete composite beam (WUSCCB). A push-out test of nine specimens was conducted, and a longitudinal shear bearing mechanism of WUSCCB flange-web interface was proposed. Different from conventional steel-concrete composite beams, the longitudinal shear force at WUSCCB flange-web interface is contributed by both the local compression between shear connectors and surrounding concrete and the longitudinal shear of concrete flange. A finite element analysis was also conducted, revealing the shear mechanism of embedded shear connectors. Subsequently, a parametric analysis including 39 models was carried out to investigate the effects of concrete strength and connector details on the shear resistance behavior, revealing that the width and thickness of connectors are the crucial factors of shear capacity. Based on the test and parametric analysis results, a shear connection design method is proposed. Finally, a finite element model of WUSCCB was developed to verify the design method by examining the relationship between WUSCCB flexural behavior and shear connection degree.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 120020"},"PeriodicalIF":5.6,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Novel filler-free buckling-restrained steel energy dissipation devices: Cyclic behavior and failure mechanism

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-03-07 DOI: 10.1016/j.engstruct.2025.120032

Zhanhong Zhang , Bin Wang , Theodore L. Karavasilis , Peng Chen , Mengtao Wu

The concept of self-centering structures has emerged in recent years to enhance seismic resilience under strong earthquakes. In self-centering structural systems, seismic damage is typically designed to be concentrated on energy dissipation (ED) devices that can be easily repaired or replaced after an earthquake. Among various ED devices, buckling-restrained steel bar-type dissipaters have received widespread attention due to their excellent hysteresis behavior. Traditionally, these types of dissipaters are designed with a reduced section (i.e., fuse part) surrounded by a steel confining tube, and the gap between them is filled with grout or epoxy to prevent global buckling of the steel bar under tension–compression cyclic loading. However, there is no doubt that such design concept faces several challenges in practical applications, including grouting difficulties, low material utilization, and laborious machining due to the reduced section in the fuse part. To address these issues, this paper presents a novel type of filler-free buckling-restrained ED device to overcome the abovementioned limitations of conventional steel bar-type dissipaters. The design concept of the proposed ED devices was illustrated first. Subsequently, cyclic behavior and failure mechanism of the proposed ED devices were investigated experimentally under quasi-static cyclic loading. Test results show that all specimens exhibit satisfactory hysteresis loops with stable ED capability under different loading conditions. The failure modes of all specimens concentrate in the fuse parts, and there is no out-of-plane bending instability failure due to the constraint provided by the additional restrained sleeves. Moreover, a practical evaluation method was proposed to prevent the out-of-plane bending instability of the proposed devices in seismic applications.

{"title":"Novel filler-free buckling-restrained steel energy dissipation devices: Cyclic behavior and failure mechanism","authors":"Zhanhong Zhang , Bin Wang , Theodore L. Karavasilis , Peng Chen , Mengtao Wu","doi":"10.1016/j.engstruct.2025.120032","DOIUrl":"10.1016/j.engstruct.2025.120032","url":null,"abstract":"<div><div>The concept of self-centering structures has emerged in recent years to enhance seismic resilience under strong earthquakes. In self-centering structural systems, seismic damage is typically designed to be concentrated on energy dissipation (ED) devices that can be easily repaired or replaced after an earthquake. Among various ED devices, buckling-restrained steel bar-type dissipaters have received widespread attention due to their excellent hysteresis behavior. Traditionally, these types of dissipaters are designed with a reduced section (i.e., fuse part) surrounded by a steel confining tube, and the gap between them is filled with grout or epoxy to prevent global buckling of the steel bar under tension–compression cyclic loading. However, there is no doubt that such design concept faces several challenges in practical applications, including grouting difficulties, low material utilization, and laborious machining due to the reduced section in the fuse part. To address these issues, this paper presents a novel type of filler-free buckling-restrained ED device to overcome the abovementioned limitations of conventional steel bar-type dissipaters. The design concept of the proposed ED devices was illustrated first. Subsequently, cyclic behavior and failure mechanism of the proposed ED devices were investigated experimentally under quasi-static cyclic loading. Test results show that all specimens exhibit satisfactory hysteresis loops with stable ED capability under different loading conditions. The failure modes of all specimens concentrate in the fuse parts, and there is no out-of-plane bending instability failure due to the constraint provided by the additional restrained sleeves. Moreover, a practical evaluation method was proposed to prevent the out-of-plane bending instability of the proposed devices in seismic applications.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 120032"},"PeriodicalIF":5.6,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reinforcement-learning empowered adaptive piezoelectric metamaterial for variable-frequency vibration attenuation

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-03-07 DOI: 10.1016/j.engstruct.2025.120013

Wangpeng Huang , Wei Tang , Zhenwei Chen , Lihua Tang , Chong Chen , Longfei Hou

The complex environmental and variable-frequency excitation necessitate the adaptive capabilities of elastic metamaterials in vibration attenuation applications. This paper introduces an AI-empowered adaptive metamaterial featuring locally resonant units with each comprising a piezoelectric transducer, a voltage-controlled synthetic inductor and a digital control circuit. To overcome the frequency misalignment caused by uncertain variations in the equivalent capacitance of piezoelectric elements, a learning-based strategy is proposed for bandgap tuning to adapt to external changes. Specifically, a Twin Delayed Deep Deterministic policy gradient (TD3) agent is customized for the metamaterial tuning task, and a data-driven simulation environment is constructed based on it. Subsequently, the agent is trained offline to explore the optimal unified control strategy. To compensate for electrical differences among piezoelectric resonate units, a dual-stage strategy is tailored to deploy the learned policy. Experimental results confirm that the proposed method endows the metamaterial beam to achieve the optimal tuning of the vibration attenuation characteristics in the variable-frequency environment.

{"title":"Reinforcement-learning empowered adaptive piezoelectric metamaterial for variable-frequency vibration attenuation","authors":"Wangpeng Huang , Wei Tang , Zhenwei Chen , Lihua Tang , Chong Chen , Longfei Hou","doi":"10.1016/j.engstruct.2025.120013","DOIUrl":"10.1016/j.engstruct.2025.120013","url":null,"abstract":"<div><div>The complex environmental and variable-frequency excitation necessitate the adaptive capabilities of elastic metamaterials in vibration attenuation applications. This paper introduces an AI-empowered adaptive metamaterial featuring locally resonant units with each comprising a piezoelectric transducer, a voltage-controlled synthetic inductor and a digital control circuit. To overcome the frequency misalignment caused by uncertain variations in the equivalent capacitance of piezoelectric elements, a learning-based strategy is proposed for bandgap tuning to adapt to external changes. Specifically, a Twin Delayed Deep Deterministic policy gradient (TD3) agent is customized for the metamaterial tuning task, and a data-driven simulation environment is constructed based on it. Subsequently, the agent is trained offline to explore the optimal unified control strategy. To compensate for electrical differences among piezoelectric resonate units, a dual-stage strategy is tailored to deploy the learned policy. Experimental results confirm that the proposed method endows the metamaterial beam to achieve the optimal tuning of the vibration attenuation characteristics in the variable-frequency environment.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 120013"},"PeriodicalIF":5.6,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Risk-based optimum design of a device to simultaneously protect building columns against accidental impact, fire and progressive slab collapse

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-03-07 DOI: 10.1016/j.engstruct.2025.119983

Luiz Eduardo Gonçalves de Mattos, José Caio Couto Bezerra Carneiro, André Teófilo Beck

Recent studies on risk-based cost–benefit analysis of progressive collapse mitigation have shown that protection and strengthening measures should be effective and of limited cost, such that these measures have a net effect in reducing total expected costs, under low probability hazards. This sparked the idea of a device which could simultaneously protect building columns against fire and vehicular impact, and which could absorb the energy of collapsing slabs. This manuscript presents the proof-of-concept for such a device. The immediate target application is flat slab parking garages: flat slab buildings are particularly vulnerable to column loss events, and parking garages are exposed to significant fire and vehicular impact threats. The proposed device consists of cellular structures, known for their energy absorption and thermal insulation properties. Moreover, recent studies have shown that hazard probabilities play a major role in the optimal risk-based design for progressive collapse mitigation. Hence, the fire and vehicular impact hazard probabilities are treated as independent parameters in the analysis. Results show how the optimal protective device design changes with respect to such hazard probabilities. Results show the potential and effectiveness of the proposed device, while revealing new facets of structural system behavior under collapse propagation.

{"title":"Risk-based optimum design of a device to simultaneously protect building columns against accidental impact, fire and progressive slab collapse","authors":"Luiz Eduardo Gonçalves de Mattos, José Caio Couto Bezerra Carneiro, André Teófilo Beck","doi":"10.1016/j.engstruct.2025.119983","DOIUrl":"10.1016/j.engstruct.2025.119983","url":null,"abstract":"<div><div>Recent studies on risk-based cost–benefit analysis of progressive collapse mitigation have shown that protection and strengthening measures should be effective and of limited cost, such that these measures have a net effect in reducing total expected costs, under low probability hazards. This sparked the idea of a device which could simultaneously protect building columns against fire and vehicular impact, and which could absorb the energy of collapsing slabs. This manuscript presents the proof-of-concept for such a device. The immediate target application is flat slab parking garages: flat slab buildings are particularly vulnerable to column loss events, and parking garages are exposed to significant fire and vehicular impact threats. The proposed device consists of cellular structures, known for their energy absorption and thermal insulation properties. Moreover, recent studies have shown that hazard probabilities play a major role in the optimal risk-based design for progressive collapse mitigation. Hence, the fire and vehicular impact hazard probabilities are treated as independent parameters in the analysis. Results show how the optimal protective device design changes with respect to such hazard probabilities. Results show the potential and effectiveness of the proposed device, while revealing new facets of structural system behavior under collapse propagation.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 119983"},"PeriodicalIF":5.6,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bridge temperature data extraction and recovery based on physics-aided VMD and temporal convolutional network

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-03-06 DOI: 10.1016/j.engstruct.2025.119967

Lei Huang , Jingzhou Xin , Yan Jiang , Qizhi Tang , Hong Zhang , Simon X. Yang , Jianting Zhou

Temperature usually has a significant impact on the structural response, and may even mask the response caused by vehicle loads. Accurately extracting temperature effect of in-service bridges is crucial for the structural performance evaluation and maintenance schedule planning. However, the noise and sensor failure are frequently-occurred because of the complex service environment, and usually bring out serious problems such as poor quality and missing data, which may result in inaccurate acquisition of the temperature distribution of the structure. To this end, this paper proposes a method for extracting and recovering temperature data based on physics-aided Variational Mode Decomposition (VMD) and Temporal Convolutional Network (TCN). Firstly, the physical relationship between the structural temperature and the ambient temperature is employed to assist in determining the number of decomposition modes for the physics-aided VMD, thereby enabling the effective extraction of the temperature data (i.e., isolating the true temperature variations from noise and unusual fluctuations). Secondly, the extracted data from different channels strongly correlated with those data corresponding to the missing channel are utilized as inputs of TCN for taking into account both spatial and temporal data characteristics. Numerical examples based on the actual bridge monitoring data illustrates that the physics-aided VMD achieves the superior accuracy in temperature data extraction. On this basis, TCN-based data recovery outperforms Recurrent Neural Network and Long Short-Term Memory networks, with mean absolute error reductions of 45.5 % and 22.6 %, respectively. Additionally, statistical analysis and the Diebold-Mariano test are employed to comprehensively evaluate the recovery capability of the proposed method.

{"title":"Bridge temperature data extraction and recovery based on physics-aided VMD and temporal convolutional network","authors":"Lei Huang , Jingzhou Xin , Yan Jiang , Qizhi Tang , Hong Zhang , Simon X. Yang , Jianting Zhou","doi":"10.1016/j.engstruct.2025.119967","DOIUrl":"10.1016/j.engstruct.2025.119967","url":null,"abstract":"<div><div>Temperature usually has a significant impact on the structural response, and may even mask the response caused by vehicle loads. Accurately extracting temperature effect of in-service bridges is crucial for the structural performance evaluation and maintenance schedule planning. However, the noise and sensor failure are frequently-occurred because of the complex service environment, and usually bring out serious problems such as poor quality and missing data, which may result in inaccurate acquisition of the temperature distribution of the structure. To this end, this paper proposes a method for extracting and recovering temperature data based on physics-aided Variational Mode Decomposition (VMD) and Temporal Convolutional Network (TCN). Firstly, the physical relationship between the structural temperature and the ambient temperature is employed to assist in determining the number of decomposition modes for the physics-aided VMD, thereby enabling the effective extraction of the temperature data (i.e., isolating the true temperature variations from noise and unusual fluctuations). Secondly, the extracted data from different channels strongly correlated with those data corresponding to the missing channel are utilized as inputs of TCN for taking into account both spatial and temporal data characteristics. Numerical examples based on the actual bridge monitoring data illustrates that the physics-aided VMD achieves the superior accuracy in temperature data extraction. On this basis, TCN-based data recovery outperforms Recurrent Neural Network and Long Short-Term Memory networks, with mean absolute error reductions of 45.5 % and 22.6 %, respectively. Additionally, statistical analysis and the Diebold-Mariano test are employed to comprehensively evaluate the recovery capability of the proposed method.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"331 ","pages":"Article 119967"},"PeriodicalIF":5.6,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic response of concrete beams considering spatial variability of pitting corrosion damages subjected to impact loads

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-03-06 DOI: 10.1016/j.engstruct.2025.120026

Yu Liu , Yifei Hao , Hong Hao , Huawei Li , Yun Zhou

The spatially distributed pitting corrosion on steel rebar results in uneven loss of sections, deteriorating the material and bonding strength, thereby the resistance to dynamic loads of reinforced concrete (RC) members. Previous studies of the dynamic response of RC members under impact loads usually considered the structures in intact conditions. In the few studies that considered the corrosion deterioration, uniform corrosion damage was assumed, which might not reflect the actual corrosion damage conditions and thus might lead to inaccurate predictions of impact responses. This study numerically investigates the effects of pitting corrosion on the impact response of RC beams. The high-fidelity finite element model of corroded RC beams was established and validated in LS-DYNA. The loss of rebar and bonding interface and generation of rust expansion caused by spatially varying pittings in tensile rebar were considered. The dynamic response, reaction force, internal force, and damage mode were analysed. Effects of various factors, including corrosion degree, concrete strength, and impact energy were examined. It is found that the midspan displacement and internal force of RC beams change significantly with pitting corrosion damage under impact loads. Compared to the intact beam, the residual displacement increases by 63.9 % with an increase of corrosion degree of 20 %. Pitting corrosion also affects the impact force prominently after the first peak. The secondary peak becomes lower and the plateau phase duration becomes longer compared to the uncorroded beam. Punching shear failure is found in corroded beams, especially under high-intensity impact.

{"title":"Dynamic response of concrete beams considering spatial variability of pitting corrosion damages subjected to impact loads","authors":"Yu Liu , Yifei Hao , Hong Hao , Huawei Li , Yun Zhou","doi":"10.1016/j.engstruct.2025.120026","DOIUrl":"10.1016/j.engstruct.2025.120026","url":null,"abstract":"<div><div>The spatially distributed pitting corrosion on steel rebar results in uneven loss of sections, deteriorating the material and bonding strength, thereby the resistance to dynamic loads of reinforced concrete (RC) members. Previous studies of the dynamic response of RC members under impact loads usually considered the structures in intact conditions. In the few studies that considered the corrosion deterioration, uniform corrosion damage was assumed, which might not reflect the actual corrosion damage conditions and thus might lead to inaccurate predictions of impact responses. This study numerically investigates the effects of pitting corrosion on the impact response of RC beams. The high-fidelity finite element model of corroded RC beams was established and validated in LS-DYNA. The loss of rebar and bonding interface and generation of rust expansion caused by spatially varying pittings in tensile rebar were considered. The dynamic response, reaction force, internal force, and damage mode were analysed. Effects of various factors, including corrosion degree, concrete strength, and impact energy were examined. It is found that the midspan displacement and internal force of RC beams change significantly with pitting corrosion damage under impact loads. Compared to the intact beam, the residual displacement increases by 63.9 % with an increase of corrosion degree of 20 %. Pitting corrosion also affects the impact force prominently after the first peak. The secondary peak becomes lower and the plateau phase duration becomes longer compared to the uncorroded beam. Punching shear failure is found in corroded beams, especially under high-intensity impact.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 120026"},"PeriodicalIF":5.6,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Extensive experimental study on five types of paianta walls - StrongPa project

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-03-06 DOI: 10.1016/j.engstruct.2025.120003

Sometrey Mey , Ichiro Hirano , Andreea Dutu , Mihai Niste , Daniel Mocanescu , Shoichi Kishiki

Timber-framed houses are widely used worldwide, with structural variations influenced by geography and tradition. In Romania, paianta houses - a vernacular timber-framed structural system - feature different infill materials based on regional availability: i.e. timber logs in mountainous areas and clay-straw mixtures in plains. Given Romania's seismic risk, particularly from the Vrancea source, concerns about the seismic resilience of paianta houses have arisen. However, studies on their structural behavior remain limited, and no standardized evaluation method exists. The StrongPa project aims to develop strengthening techniques for paianta houses through extensive experimental testing. This paper presents the first part of experimental program which investigates the in-plane static loading behavior of timber-framed walls, constructed in line with traditional Romanian methods. Key findings indicate that infills significantly increase both stiffness and strength of the walls, bi-linearization of envelope curves using EN12512 method B showed better match to experimental results, energy dissipation calculated for both experimental results and bi-linearized curves reconfirmed that the method B is appropriate for walls with infills, damping ratios, and stiffness degradation were analyzed to compare structural performance among the different types of infills.

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引用次数: 0

Bond performance in reinforced concrete exposed to moderately-high sustained temperatures

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-03-06 DOI: 10.1016/j.engstruct.2025.120007

Shuo Liu , Wenzhong Zheng , Wenlong Tang , Ying Wang

Many reinforced-concrete structures often found in nuclear power plants, waste-treatment plants, and metallurgical and chemical factories, are exposed to moderately-high temperatures (generally not exceeding 350 °C) for long periods. Bar-concrete bond in such conditions, however, have received so far limited attention mostly because of the complexity of the tests. In this work, the bond performance in concrete-embedded ribbed bars under moderately-high sustained temperatures was experimentally and theoretically studied. The specimens tested have a bonded length-to-bar diameter ratio of 8.75 and a cover-to-bar diameter ratio of 5.75. The results show that especially above 200 °C bond strength and stiffness markedly decrease, while bar slip at the peak of the bond stress and bond energy-absorption capacity increase. As an example, a 24-h exposure to 350 °C causes a 18 % and 85 % decrease in bond strength and stiffness, respectively, while bar slip at the peak stress and bond energy-absorption capacity increase by 114 % and 41 %, respectively. At relatively small values of bar slip, the bond stress is mainly provided by chemical adhesion, and the bond stiffness is more sensitive to temperature changes. Similarly, higher temperatures (up to 350°C) primarily affect bond performance due to the mechanical degradation of the concrete, that changes also the profile of the bond stress and of the slip along the bonded length. According to theoretical analysis, the higher the temperature and the longer the heating process, the more pronounced the shift of the maximum bond stress away from the loaded end of the anchored bar. A formula for the calculation of bond strength and a bond-slip constitutive model under moderately-high sustained temperatures are proposed as well.

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引用次数: 0