Engineering Structures最新文献

英文中文

Full-coupled post-fire performance analysis of geopolymeric recycled aggregate concrete-filled steel tubular columns

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-13 DOI: 10.1016/j.engstruct.2025.119631

Kai Xiang , Xing-Yu Qu , Zhu Pan , Tian-Yi Song , Hongyuan Zhou , Qing-Hua Tan

This paper presents a numerical investigation into the post-fire performance of geopolymeric recycled aggregate concrete-filled steel tube (GRACFST) columns under a full-coupled fire and loading phase, including ambient temperature loading, heating, cooling, and post-fire loading. First, mechanical property models for passively confined geopolymeric recycled aggregate concrete (GRAC) in steel tubes were calibrated across the four temperature phases using existing test data. A refined finite element analysis (FEA) model was then developed and validated against existing test results, showing acceptable accuracy. This model was further extended to simulate a full-size GRACFST column, examining temperature distribution, deformation, stress development, load redistribution, and steel-concrete interaction. Using the proposed FEA model, a parameter analysis was conducted to identify key factors affecting fire resistance and post-fire bearing capacity. The results indicated that the column load ratio, section dimensions, and slenderness ratio significantly impact fire resistance, while post-fire bearing capacity is mainly influenced by column load ratio, heating time ratio, section dimensions, steel ratio, slenderness ratio, steel yield strength, and concrete compressive strength. Finally, simplified equations are proposed for fire design and post-fire evaluation of GRACFST columns.

{"title":"Full-coupled post-fire performance analysis of geopolymeric recycled aggregate concrete-filled steel tubular columns","authors":"Kai Xiang , Xing-Yu Qu , Zhu Pan , Tian-Yi Song , Hongyuan Zhou , Qing-Hua Tan","doi":"10.1016/j.engstruct.2025.119631","DOIUrl":"10.1016/j.engstruct.2025.119631","url":null,"abstract":"<div><div>This paper presents a numerical investigation into the post-fire performance of geopolymeric recycled aggregate concrete-filled steel tube (GRACFST) columns under a full-coupled fire and loading phase, including ambient temperature loading, heating, cooling, and post-fire loading. First, mechanical property models for passively confined geopolymeric recycled aggregate concrete (GRAC) in steel tubes were calibrated across the four temperature phases using existing test data. A refined finite element analysis (FEA) model was then developed and validated against existing test results, showing acceptable accuracy. This model was further extended to simulate a full-size GRACFST column, examining temperature distribution, deformation, stress development, load redistribution, and steel-concrete interaction. Using the proposed FEA model, a parameter analysis was conducted to identify key factors affecting fire resistance and post-fire bearing capacity. The results indicated that the column load ratio, section dimensions, and slenderness ratio significantly impact fire resistance, while post-fire bearing capacity is mainly influenced by column load ratio, heating time ratio, section dimensions, steel ratio, slenderness ratio, steel yield strength, and concrete compressive strength. Finally, simplified equations are proposed for fire design and post-fire evaluation of GRACFST columns.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"327 ","pages":"Article 119631"},"PeriodicalIF":5.6,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102718","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

Data-driven digital twin framework for large-scale dynamic structures based on model reduction and damage regression identification

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-13 DOI: 10.1016/j.engstruct.2025.119688

Hanxu Yang , Bo Yan , Kaiwen Wu , Yingbo Gao , Huachao Deng , Zhongbin Lv , Bo Zhang

A framework and construction method for data-driven digital twin of large-scale dynamic structures based on model order reduction (MOR) and damage regression identification are proposed. The Krylov subspace order reduction method is used to reduce the orders of the high-fidelity finite element (FE) models corresponding to the possible damaged states of the structure during service, and a reduced-order model library is then set up. Using the models in the library, the dynamic responses of the damaged structure are quickly computed. With the dynamic response dataset, the damage regression identification model of the structure is established by the MLP-ResNet algorithm and used to update the digital twin following the evolution of the damaged state of the structure. Combining the proper orthogonal decomposition (POD) and deep learning algorithm, a surrogate model for the Krylov subspace projection matrices of the reduced-order models corresponding to the identified damaged states which are not included in the reduced-order model library is established. Using the surrogate model, the projection matrices and the dynamic responses of the damaged structure can be quickly calculated. The efficiency of the digital twin driven by the sensor data is demonstrated by a physical frame structure experimentally and numerically, and the suitability of the method for a large-scale structure is illustrated with the digital twin of a transmission tower. However, the damaged states of a structure during service and the type of sensors and their assignment scheme should be designed specifically in applications.

{"title":"Data-driven digital twin framework for large-scale dynamic structures based on model reduction and damage regression identification","authors":"Hanxu Yang , Bo Yan , Kaiwen Wu , Yingbo Gao , Huachao Deng , Zhongbin Lv , Bo Zhang","doi":"10.1016/j.engstruct.2025.119688","DOIUrl":"10.1016/j.engstruct.2025.119688","url":null,"abstract":"<div><div>A framework and construction method for data-driven digital twin of large-scale dynamic structures based on model order reduction (MOR) and damage regression identification are proposed. The Krylov subspace order reduction method is used to reduce the orders of the high-fidelity finite element (FE) models corresponding to the possible damaged states of the structure during service, and a reduced-order model library is then set up. Using the models in the library, the dynamic responses of the damaged structure are quickly computed. With the dynamic response dataset, the damage regression identification model of the structure is established by the MLP-ResNet algorithm and used to update the digital twin following the evolution of the damaged state of the structure. Combining the proper orthogonal decomposition (POD) and deep learning algorithm, a surrogate model for the Krylov subspace projection matrices of the reduced-order models corresponding to the identified damaged states which are not included in the reduced-order model library is established. Using the surrogate model, the projection matrices and the dynamic responses of the damaged structure can be quickly calculated. The efficiency of the digital twin driven by the sensor data is demonstrated by a physical frame structure experimentally and numerically, and the suitability of the method for a large-scale structure is illustrated with the digital twin of a transmission tower. However, the damaged states of a structure during service and the type of sensors and their assignment scheme should be designed specifically in applications.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"327 ","pages":"Article 119688"},"PeriodicalIF":5.6,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102735","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

Analytical behaviour of concrete-encased concrete-filled steel tubular (CFST) member under combined compression and shear load

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-13 DOI: 10.1016/j.engstruct.2025.119616

Zhi-Cheng Yang, Lin-Hai Han, Wei Li

This paper presents finite element analysis of the concrete-encased concrete-filled steel tubular (CFST) members under combined compression and shear load. A finite element model is established and validated through previous experimental results. Based on the validated model, the shear behaviour of concrete-encased CFST member is analysed, including typical failure modes, shear-deflection relationship, axial force-deflection relationship and deformation. The stress analysis reveals the force transfer mechanism of the aforementioned member. Furthermore, the parametric analysis is conducted on key parameters related to the external reinforced concrete (RC) component, the internal CFST component and loading conditions. The influence of each parameter on the shear performance of the members is clarified. The results show that the proportion of shear deformation to total deformation is affected not only by the shear span-to-depth ratio but also by the specific positions along the shear span. The "hybrid effect" between the internal CFST and external RC is evident in two aspects: the external RC provides confinement for the internal CFST, particularly in the transverse position, and effective vertical transfer of shear load from the external RC to the internal CFST through the "vertical strut". Finally, a simplified calculation method for concrete-encased CFST member under combined compression and shear load is proposed.

{"title":"Analytical behaviour of concrete-encased concrete-filled steel tubular (CFST) member under combined compression and shear load","authors":"Zhi-Cheng Yang, Lin-Hai Han, Wei Li","doi":"10.1016/j.engstruct.2025.119616","DOIUrl":"10.1016/j.engstruct.2025.119616","url":null,"abstract":"<div><div>This paper presents finite element analysis of the concrete-encased concrete-filled steel tubular (CFST) members under combined compression and shear load. A finite element model is established and validated through previous experimental results. Based on the validated model, the shear behaviour of concrete-encased CFST member is analysed, including typical failure modes, shear-deflection relationship, axial force-deflection relationship and deformation. The stress analysis reveals the force transfer mechanism of the aforementioned member. Furthermore, the parametric analysis is conducted on key parameters related to the external reinforced concrete (RC) component, the internal CFST component and loading conditions. The influence of each parameter on the shear performance of the members is clarified. The results show that the proportion of shear deformation to total deformation is affected not only by the shear span-to-depth ratio but also by the specific positions along the shear span. The \"hybrid effect\" between the internal CFST and external RC is evident in two aspects: the external RC provides confinement for the internal CFST, particularly in the transverse position, and effective vertical transfer of shear load from the external RC to the internal CFST through the \"vertical strut\". Finally, a simplified calculation method for concrete-encased CFST member under combined compression and shear load is proposed.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"327 ","pages":"Article 119616"},"PeriodicalIF":5.6,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102732","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

Strain-based performance evaluation of planar flexural reinforced concrete walls

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-13 DOI: 10.1016/j.engstruct.2025.119643

Priyana Rajbhandari , Trevor Zhiqing Yeow , David Mukai , Susumu Kono

This study enables the prediction of seismic damage to planar flexural reinforced concrete (RC) walls by using a simple numerical tool. Strain limits for concrete and longitudinal reinforcement are established for the conceptual damage levels (damage levels I, II, III, and IV) outlined in the Japanese guidelines for post-earthquake damage evaluation. The strain limits are validated against experimental data from 27 previously tested RC wall specimens with different geometry-, section-, loading-, and material-related parameters, using a force-based beam-column element model with a modified Gauss-Radau plastic hinge integration rule and regularized material models. The results indicate that experimental damages at the drift ratio corresponding to the proposed strain limits align with the damage descriptions of the specified damage levels. The drifts at the proposed strain limits are compared with those obtained using the acceptance criteria for the three performance levels (IO, LS, and CP) in ASCE/SEI 41–23 to give a tentative understanding of their alignment with established performance standards.

{"title":"Strain-based performance evaluation of planar flexural reinforced concrete walls","authors":"Priyana Rajbhandari , Trevor Zhiqing Yeow , David Mukai , Susumu Kono","doi":"10.1016/j.engstruct.2025.119643","DOIUrl":"10.1016/j.engstruct.2025.119643","url":null,"abstract":"<div><div>This study enables the prediction of seismic damage to planar flexural reinforced concrete (RC) walls by using a simple numerical tool. Strain limits for concrete and longitudinal reinforcement are established for the conceptual damage levels (damage levels I, II, III, and IV) outlined in the Japanese guidelines for post-earthquake damage evaluation. The strain limits are validated against experimental data from 27 previously tested RC wall specimens with different geometry-, section-, loading-, and material-related parameters, using a force-based beam-column element model with a modified Gauss-Radau plastic hinge integration rule and regularized material models. The results indicate that experimental damages at the drift ratio corresponding to the proposed strain limits align with the damage descriptions of the specified damage levels. The drifts at the proposed strain limits are compared with those obtained using the acceptance criteria for the three performance levels (IO, LS, and CP) in ASCE/SEI 41–23 to give a tentative understanding of their alignment with established performance standards.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"327 ","pages":"Article 119643"},"PeriodicalIF":5.6,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Critical review of current wind turbine blades’ design and materials and their influence on the end-of-life management of wind turbines

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-13 DOI: 10.1016/j.engstruct.2025.119625

L.M. Martulli , M. Diani , G. Sabetta , S. Bontumasi , M. Colledani , A. Bernasconi

Wind energy will likely be an essential contributor to the sustainable energy transition. However, the environmental impact of the wind sector still suffers from a poor end-of-life management of the wind turbine components. Wind turbine blades are particularly sensitive to this issue: these components are made of different materials and sub-components, often difficult to separate, segment and recycle. As a result, wind turbine blades are still mostly landfilled. In this review, the main design features and materials of wind turbine blades are presented and connected to the difficulties and opportunities related to the end-of-life management of wind turbines. Considering the possibility of life extension, structural health monitoring and repairing strategies are also discussed. Overall, wind turbine blades are complex components, which require a significant advancement of the scientific and technological state of the art for an efficient and sustainable end-of-life management.

引用次数: 0

The vortex-induced vibration of a circular cylinder with helical grooves

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-13 DOI: 10.1016/j.engstruct.2025.119669

Xiangjun Wang , Yin Zhu , Hubin Yan , Peng Hu , Yan Han

A novel approach utilizing helical grooves is proposed to suppress the vortex-induced vibration of a circular cylinder. Initially, the influence of the depth, width and pitch of the helical grooves on the aerodynamic coefficients of a stationary rigid circular cylinder is numerically investigated at

Re \approx 6.8 \times 1 0^{4}

, where

Re

denotes the Reynolds number based on the cylinder diameter and the incoming flow velocity. Owing to the disturbance of the helical grooves, the spanwise convection in the wake is enhanced and the spanwise correlations of the pressure and vortices are reduced, so that the alternate shedding of vortices in the wake is suppressed. Therefore, the aerodynamic coefficients on the cylinder are reduced. With the optimal parameters, the average drag coefficient,

C d_{m e a n}

, is reduced by more than 33%, and the root-mean-square value of the lift coefficient,

C l_{r m s}

, is decreased by over 92%. For a spring-mounted cylinder with one-degree-of-freedom vibrations, the helical grooves can maximally reduce the amplitude of the VIV of a cylinder by up to 94.4%, Additionally, they can completely eliminate the frequency lock-in phenomenon. Then, the stable negative aerodynamic stiffness and damping cannot be maintained, thereby effectively suppressing the VIV.

{"title":"The vortex-induced vibration of a circular cylinder with helical grooves","authors":"Xiangjun Wang , Yin Zhu , Hubin Yan , Peng Hu , Yan Han","doi":"10.1016/j.engstruct.2025.119669","DOIUrl":"10.1016/j.engstruct.2025.119669","url":null,"abstract":"<div><div>A novel approach utilizing helical grooves is proposed to suppress the vortex-induced vibration of a circular cylinder. Initially, the influence of the depth, width and pitch of the helical grooves on the aerodynamic coefficients of a stationary rigid circular cylinder is numerically investigated at <span><math><mrow><mi>Re</mi><mo>≈</mo><mn>6</mn><mo>.</mo><mn>8</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>4</mn></mrow></msup></mrow></math></span>, where <span><math><mi>Re</mi></math></span> denotes the Reynolds number based on the cylinder diameter and the incoming flow velocity. Owing to the disturbance of the helical grooves, the spanwise convection in the wake is enhanced and the spanwise correlations of the pressure and vortices are reduced, so that the alternate shedding of vortices in the wake is suppressed. Therefore, the aerodynamic coefficients on the cylinder are reduced. With the optimal parameters, the average drag coefficient, <span><math><mrow><mi>C</mi><msub><mrow><mi>d</mi></mrow><mrow><mi>m</mi><mi>e</mi><mi>a</mi><mi>n</mi></mrow></msub></mrow></math></span>, is reduced by more than 33%, and the root-mean-square value of the lift coefficient, <span><math><mrow><mi>C</mi><msub><mrow><mi>l</mi></mrow><mrow><mi>r</mi><mi>m</mi><mi>s</mi></mrow></msub></mrow></math></span>, is decreased by over 92%. For a spring-mounted cylinder with one-degree-of-freedom vibrations, the helical grooves can maximally reduce the amplitude of the VIV of a cylinder by up to 94.4%, Additionally, they can completely eliminate the frequency lock-in phenomenon. Then, the stable negative aerodynamic stiffness and damping cannot be maintained, thereby effectively suppressing the VIV.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"327 ","pages":"Article 119669"},"PeriodicalIF":5.6,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102730","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

Concurrent optimization of truss structures and build directions for multi-axis additive manufacturing

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-13 DOI: 10.1016/j.engstruct.2025.119680

Jun Ye , Xiaoyang Lin , Hongjia Lu , Linwei He , Guan Quan , Cheng Huang , Paul Shepherd

Additive manufacturing (AM) has undergone rapid development over the past decade, yet printing parts with overhangs still poses a critical challenge, restricting the fabrication of components with arbitrary geometries. In structural optimization, incorporating overhang constraints can mitigate this issue. However, prior research has predominantly focused on 3-axis machines, leaving multi-axis capabilities insufficiently explored. These conventional 3-axis approaches often necessitate considerable trade-offs in structural material consumption. To overcome this, our study introduces a novel two-step optimization method tailored for multi-axis AM, which uses an optimized structure from traditional layout optimization as the starting point. The first step involves decomposing the design domain into multiple zones and solving a novel optimization problem to identify optimal local build directions for each zone, aiming to maximize the structure's printability. If the printability is still not satisfactory, we proceed to a second step, which refines the structure and build directions to minimize overhanging elements. Our examples validate the effectiveness of the proposed method, showing that the substantial performance sacrifices typically associated with 3-axis approaches are reduced to less than 7 % with our multi-axis AM-based approach.

{"title":"Concurrent optimization of truss structures and build directions for multi-axis additive manufacturing","authors":"Jun Ye , Xiaoyang Lin , Hongjia Lu , Linwei He , Guan Quan , Cheng Huang , Paul Shepherd","doi":"10.1016/j.engstruct.2025.119680","DOIUrl":"10.1016/j.engstruct.2025.119680","url":null,"abstract":"<div><div>Additive manufacturing (AM) has undergone rapid development over the past decade, yet printing parts with overhangs still poses a critical challenge, restricting the fabrication of components with arbitrary geometries. In structural optimization, incorporating overhang constraints can mitigate this issue. However, prior research has predominantly focused on 3-axis machines, leaving multi-axis capabilities insufficiently explored. These conventional 3-axis approaches often necessitate considerable trade-offs in structural material consumption. To overcome this, our study introduces a novel two-step optimization method tailored for multi-axis AM, which uses an optimized structure from traditional layout optimization as the starting point. The first step involves decomposing the design domain into multiple zones and solving a novel optimization problem to identify optimal local build directions for each zone, aiming to maximize the structure's printability. If the printability is still not satisfactory, we proceed to a second step, which refines the structure and build directions to minimize overhanging elements. Our examples validate the effectiveness of the proposed method, showing that the substantial performance sacrifices typically associated with 3-axis approaches are reduced to less than 7 % with our multi-axis AM-based approach.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"327 ","pages":"Article 119680"},"PeriodicalIF":5.6,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development and full-scale experimental evaluation of a novel replaceable fuses metallic damper with double-stage yield mechanism

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-13 DOI: 10.1016/j.engstruct.2025.119684

Anahita Azhang, Sayed Mahdi Zandi, Hossein Tajmir Riahi

This study introduces a novel Replaceable Fuses Metallic Damper (RFMD) with a double-stage yield mechanism, aiming to enhance the energy dissipation capacity of structures across multiple seismic levels. The RFMD, designed with two steel pieces as the main body and a series of mild steel round bars as energy absorbers, is intended for installation along the bracing element. The external part of the RFMD must be fixed, while the internal part, with one degree of translational freedom, acts like a sliding piston along its longitudinal axis. During tension and compression in the brace, the movement of the internal part leads to bending and axial plastic deformations in the bars, absorbing energy and providing damping for the structure. Furthermore, shifts in the boundary conditions of the fuses during the loading procedure result in a two-stage yielding mechanism. The performance of a series of full-scale RFMDs was carefully examined through displacement-control monotonic and cyclic tests, demonstrating consistent stable hysteretic behavior and proper ductility over numerous cycles with no sudden decrease in stiffness or strength. The damper enables easy replacement of its fuses, which could prevent the necessity of post-earthquake replacements if engineered to avoid bar failure during intended movement. Serving as a simple, practical, and cost-effective passive energy dissipation device, the RFMD offers adequate ductility and energy dissipation, making it valuable for protecting the key components of structures.

{"title":"Development and full-scale experimental evaluation of a novel replaceable fuses metallic damper with double-stage yield mechanism","authors":"Anahita Azhang, Sayed Mahdi Zandi, Hossein Tajmir Riahi","doi":"10.1016/j.engstruct.2025.119684","DOIUrl":"10.1016/j.engstruct.2025.119684","url":null,"abstract":"<div><div>This study introduces a novel Replaceable Fuses Metallic Damper (RFMD) with a double-stage yield mechanism, aiming to enhance the energy dissipation capacity of structures across multiple seismic levels. The RFMD, designed with two steel pieces as the main body and a series of mild steel round bars as energy absorbers, is intended for installation along the bracing element. The external part of the RFMD must be fixed, while the internal part, with one degree of translational freedom, acts like a sliding piston along its longitudinal axis. During tension and compression in the brace, the movement of the internal part leads to bending and axial plastic deformations in the bars, absorbing energy and providing damping for the structure. Furthermore, shifts in the boundary conditions of the fuses during the loading procedure result in a two-stage yielding mechanism. The performance of a series of full-scale RFMDs was carefully examined through displacement-control monotonic and cyclic tests, demonstrating consistent stable hysteretic behavior and proper ductility over numerous cycles with no sudden decrease in stiffness or strength. The damper enables easy replacement of its fuses, which could prevent the necessity of post-earthquake replacements if engineered to avoid bar failure during intended movement. Serving as a simple, practical, and cost-effective passive energy dissipation device, the RFMD offers adequate ductility and energy dissipation, making it valuable for protecting the key components of structures.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"327 ","pages":"Article 119684"},"PeriodicalIF":5.6,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102736","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

The influence of potential source parameters of novel near-fault synthetic ground motions on nonlinear cross-stream seismic response for high-arch dams based on conditional mean spectrum

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-13 DOI: 10.1016/j.engstruct.2025.119639

Tianran Zhang , Qiang Xu , Jianyun Chen , Yin Wang , Yongqian Qu , Bo Liu , Yue Fang

This paper aims to propose a novel artificial simulation method of near-fault (NF) ground motions considering different velocity pulse types in the time domain of the conditional mean spectrum (CMS), and to reveal the influence of the magnitude and distance (the two key source parameters) of NF earthquakes located in the potential source area near the engineering site of concrete high-arch dams on their nonlinear cross-stream dynamic behaviors based on the artificially synthesized NF impulsive seismic motions. Considering a constructed high-arch dam as the research object, this study adopted a complex dynamic behavior analysis method for arch dam-reservoir-foundation integral models. It comprehensively considered the nonlinearity of transverse joints, foundation radiation damping, and dam damage cracking, and compared the effects of three different types of NF earthquakes on the nonlinear responses of the dam. The research results indicate that the NF directional pulse motion (compared to other types of motion) has the greatest influence on the dynamic behavior of the dam under input conditions of large magnitude and short-distance NF ground motion. The response laws of different types of seismic motion (including directional pulse, fling-step pulse, and high-frequency non-pulse motions) generally show that when the distance of the earthquake motion is constant, the global damage volume ratio shows an exponential growth trend with an increase in magnitude, and the change trends in the damage indices for different types of motion are similar. Among the selected earthquake intensity measures, peak ground acceleration (PGA) strongly correlates with the deformation index of high-arch dams. Finally, a nonlinear damage index prediction model of a high-arch dam considering two-parameter variables is proposed, which provides a certain possibility for earthquake damage safety prediction of dam bodies.

{"title":"The influence of potential source parameters of novel near-fault synthetic ground motions on nonlinear cross-stream seismic response for high-arch dams based on conditional mean spectrum","authors":"Tianran Zhang , Qiang Xu , Jianyun Chen , Yin Wang , Yongqian Qu , Bo Liu , Yue Fang","doi":"10.1016/j.engstruct.2025.119639","DOIUrl":"10.1016/j.engstruct.2025.119639","url":null,"abstract":"<div><div>This paper aims to propose a novel artificial simulation method of near-fault (NF) ground motions considering different velocity pulse types in the time domain of the conditional mean spectrum (CMS), and to reveal the influence of the magnitude and distance (the two key source parameters) of NF earthquakes located in the potential source area near the engineering site of concrete high-arch dams on their nonlinear cross-stream dynamic behaviors based on the artificially synthesized NF impulsive seismic motions. Considering a constructed high-arch dam as the research object, this study adopted a complex dynamic behavior analysis method for arch dam-reservoir-foundation integral models. It comprehensively considered the nonlinearity of transverse joints, foundation radiation damping, and dam damage cracking, and compared the effects of three different types of NF earthquakes on the nonlinear responses of the dam. The research results indicate that the NF directional pulse motion (compared to other types of motion) has the greatest influence on the dynamic behavior of the dam under input conditions of large magnitude and short-distance NF ground motion. The response laws of different types of seismic motion (including directional pulse, fling-step pulse, and high-frequency non-pulse motions) generally show that when the distance of the earthquake motion is constant, the global damage volume ratio shows an exponential growth trend with an increase in magnitude, and the change trends in the damage indices for different types of motion are similar. Among the selected earthquake intensity measures, peak ground acceleration (PGA) strongly correlates with the deformation index of high-arch dams. Finally, a nonlinear damage index prediction model of a high-arch dam considering two-parameter variables is proposed, which provides a certain possibility for earthquake damage safety prediction of dam bodies.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"327 ","pages":"Article 119639"},"PeriodicalIF":5.6,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102733","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

A magnetostrictive tri-stable energy harvester utilizing a shared pre-magnetization field and analysis of its centrifugal effect

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-13 DOI: 10.1016/j.engstruct.2025.119644

Weiwei Dong, Huifang Liu, Quan Liang, Teng Ren, Chao Wang, Wenkai Xu, Yun Wang

Energy harvesting technology is an effective solution for passive power supply for structural health monitoring of rotating components. The group found that the tip magnetic mass block can enhance the pre-magnetized magnetic field and interact with the pre-magnetized magnet to form a symmetric tri-stable structure and present asymmetric potential energy trap characteristics. Based on this, this paper presents a magnetostrictive tri-stable rotational energy harvester with a shared pre-magnetization field for the first time. In addition, the influence of the centrifugal effect on the equivalent stiffness of a rotating cantilever beam in a nonlinear tri-stable system cannot be neglected. Still, there is a lack of relevant theories. In this paper, a dynamic model describing the influence of the centrifugal effect on the asymmetric force characteristics of the tri-stable structure is established, and the role of parameters such as installation angle and radius on the dynamic behavior of the cantilever beam is analyzed in depth. Theory and experiments show that adjusting the parameters of the tip magnetic mass block can improve the energy harvesting efficiency and broaden the frequency bandwidth of the tri-stable structure. The installation angle and radius significantly affect the system's adequate frequency bandwidth and harvesting capability. The research results provide a new solution for designing the tri-stable energy harvesting system and important theoretical guidance for optimizing the magnetostrictive rotational energy harvesting system.

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