Pub Date : 2023-07-13DOI: 10.31462/jseam.2023.02167194
Mu-Zi Zhao, D. Lehman, Xin Zhang, C. Roeder
The accuracy of the shear resistance design equation for concrete-filled steel tubes (CFSTs) is crucial to ensure the safety of CFST structures. However, the current design equations underestimate the test data, and cannot accurately predict the relative shear resistance of the steel and concrete fill. To solve this problem, this paper developed an advanced finite element model in the LS-Dyna program, which was validated using experimental results of CFST members failing in shear. A systematic parametric study was then conducted. The result showed that the contribution of the steel increased significantly with the strain-hardening ratio (F_u/F_y) while the contribution of concrete fill was greatly influenced by the internally reinforced ratio (ρ_int) and axial load level (P/P_0). These predictions were combined with the experimental results to develop a more accurate and reliable design expression for the shear strength of circular CFSTs.
{"title":"Evaluation and improvement of shear-strength expressions for circular concrete-filled steel tubes","authors":"Mu-Zi Zhao, D. Lehman, Xin Zhang, C. Roeder","doi":"10.31462/jseam.2023.02167194","DOIUrl":"https://doi.org/10.31462/jseam.2023.02167194","url":null,"abstract":"The accuracy of the shear resistance design equation for concrete-filled steel tubes (CFSTs) is crucial to ensure the safety of CFST structures. However, the current design equations underestimate the test data, and cannot accurately predict the relative shear resistance of the steel and concrete fill. To solve this problem, this paper developed an advanced finite element model in the LS-Dyna program, which was validated using experimental results of CFST members failing in shear. A systematic parametric study was then conducted. The result showed that the contribution of the steel increased significantly with the strain-hardening ratio (F_u/F_y) while the contribution of concrete fill was greatly influenced by the internally reinforced ratio (ρ_int) and axial load level (P/P_0). These predictions were combined with the experimental results to develop a more accurate and reliable design expression for the shear strength of circular CFSTs.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132635223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-13DOI: 10.31462/jseam.2023.02098116
Barbaros Atmaca, M. Arslan, M. Emiroğlu, A. Altunışık, S. Adanur, Aydin Demir, M. Günaydın, O. Kirtel, Tuba Tatar, V. Kahya, F. Sunca, F. Okur, K. Hacıefendioğlu, G. Dok, Hakan Öztürk, İ. Vural, Osman Güleş, A. F. Genç, Eren Demirkaya, Muhammet Yurdakul, Murat Nas, Y. E. Akbulut, Alihan Baltacı, B. Temel, H. B. Başağa, A. Saribiyik, Furkan Sen, Batuhan Aykanat, İrfan Ş. Öztürk, M. B. Navdar, F. Aydın, Kurban Öntürk, M. Utkucu, T. Akgül
Two major earthquakes occurred on the Eastern Anatolian Fault Line (EAF) on February 6, 2023, with an interval of nine hours. These earthquakes, measuring Mw 7.7 and Mw 7.6, were centered in the districts of Pazarcık and Elbistan in the province of Kahramanmaraş. They directly affected 11 provinces (Kahramanmaraş, Hatay, Adıyaman, Osmaniye, Gaziantep, Şanlıurfa, Malatya, Diyarbakır, Adana, Kilis, and Elazığ) in the Eastern and Southeastern Anatolia, caused significant loss of life and property. This study aims to present the field investigation and performance evaluation of engineering structures in the mentioned cities. The types of damages occurring in the reinforced concrete (RC) and masonry buildings, historical and industrial structures, bridges, and mosques were given in detail. According to the data of the Ministry of Treasury and Finance of Türkiye, it has been reported that the cost of these earthquakes is approximately 103.6 billion dollars, which corresponds to nine percent of Türkiye's national income expectation for 2023 and causes damage and losses of approximately six times more than the 1999 Marmara earthquake. In the areas affected by earthquakes, many of the errors determined by professionals from previous earthquakes still exist today.
{"title":"On the earthquake-related damages of civil engineering structures within the areas impacted by Kahramanmaraş earthquakes","authors":"Barbaros Atmaca, M. Arslan, M. Emiroğlu, A. Altunışık, S. Adanur, Aydin Demir, M. Günaydın, O. Kirtel, Tuba Tatar, V. Kahya, F. Sunca, F. Okur, K. Hacıefendioğlu, G. Dok, Hakan Öztürk, İ. Vural, Osman Güleş, A. F. Genç, Eren Demirkaya, Muhammet Yurdakul, Murat Nas, Y. E. Akbulut, Alihan Baltacı, B. Temel, H. B. Başağa, A. Saribiyik, Furkan Sen, Batuhan Aykanat, İrfan Ş. Öztürk, M. B. Navdar, F. Aydın, Kurban Öntürk, M. Utkucu, T. Akgül","doi":"10.31462/jseam.2023.02098116","DOIUrl":"https://doi.org/10.31462/jseam.2023.02098116","url":null,"abstract":"Two major earthquakes occurred on the Eastern Anatolian Fault Line (EAF) on February 6, 2023, with an interval of nine hours. These earthquakes, measuring Mw 7.7 and Mw 7.6, were centered in the districts of Pazarcık and Elbistan in the province of Kahramanmaraş. They directly affected 11 provinces (Kahramanmaraş, Hatay, Adıyaman, Osmaniye, Gaziantep, Şanlıurfa, Malatya, Diyarbakır, Adana, Kilis, and Elazığ) in the Eastern and Southeastern Anatolia, caused significant loss of life and property. This study aims to present the field investigation and performance evaluation of engineering structures in the mentioned cities. The types of damages occurring in the reinforced concrete (RC) and masonry buildings, historical and industrial structures, bridges, and mosques were given in detail. According to the data of the Ministry of Treasury and Finance of Türkiye, it has been reported that the cost of these earthquakes is approximately 103.6 billion dollars, which corresponds to nine percent of Türkiye's national income expectation for 2023 and causes damage and losses of approximately six times more than the 1999 Marmara earthquake. In the areas affected by earthquakes, many of the errors determined by professionals from previous earthquakes still exist today.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129717915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-30DOI: 10.31462/jseam.2023.01027044
Jay Prakash, Ayşe T. Daloglu
The teaching-learning optimization (TLBO) technique is applied to unbraced steel frames with semi-rigid beam-to-column connections and semi-rigid column-to-base connections. The algorithm for design produces optimized steel frames by choosing appropriate sections from a set of standard steel sections. These standard steel sections, including wide-flange profiles (W), are provided by the American Institute of Steel Construction (AISC). The first example is subjected to the displacement, inter-story drift, and stress constraints of AISC-Load and Resistance Factor Design (LRFD) regulations. In addition, the displacement and stress limitations of the AISC-Allowable Stress Design (ASD) standard and the geometric (size) requirements are implemented in the last two examples. In finite element analysis, optimal designs of three alternative unbraced frames are performed with and without semi-rigid beam-to-column and column-to-base plate connections. All optimization techniques are encoded in the high-level programming language C# version 17.4.4 to integrate with SAP2000 version 22's Open Application Programming Interface (OAPI). The analysis results indicate that the rigidity of connections is determining parameter in the weight optimization of unbraced steel frames.
{"title":"Teaching-learning-based optimization of unbraced steel frames with semi-rigid connections and column bases","authors":"Jay Prakash, Ayşe T. Daloglu","doi":"10.31462/jseam.2023.01027044","DOIUrl":"https://doi.org/10.31462/jseam.2023.01027044","url":null,"abstract":"The teaching-learning optimization (TLBO) technique is applied to unbraced steel frames with semi-rigid beam-to-column connections and semi-rigid column-to-base connections. The algorithm for design produces optimized steel frames by choosing appropriate sections from a set of standard steel sections. These standard steel sections, including wide-flange profiles (W), are provided by the American Institute of Steel Construction (AISC). The first example is subjected to the displacement, inter-story drift, and stress constraints of AISC-Load and Resistance Factor Design (LRFD) regulations. In addition, the displacement and stress limitations of the AISC-Allowable Stress Design (ASD) standard and the geometric (size) requirements are implemented in the last two examples. In finite element analysis, optimal designs of three alternative unbraced frames are performed with and without semi-rigid beam-to-column and column-to-base plate connections. All optimization techniques are encoded in the high-level programming language C# version 17.4.4 to integrate with SAP2000 version 22's Open Application Programming Interface (OAPI). The analysis results indicate that the rigidity of connections is determining parameter in the weight optimization of unbraced steel frames.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114686966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-30DOI: 10.31462/jseam.2023.01010026
Mehmet Firat Karapinar, Baris Gunes, B. Sayın
The current paper presents a seismic performance assessment of a low-story RC building through the time history analysis and a retrofitting proposal accordingly. The seismic analyses were repeated for the retrofitted building model and the effectiveness of the retrofitting proposal was determined. In the first stage of the study, the design project and material characteristics of the building were examined. Using these data, a 3D model of the building was prepared on the Midas Gen program. Next, a total of 11 earthquake records were selected and scaled for nonlinear time history analysis. Using the analysis results with the codes written on the Matlab program, the damage states of the load-bearing members were determined and the building’s performance was measured. The results indicated that some load-bearing members have insufficient strength and a retrofitting proposal was made accordingly. A building model was then prepared considering the retrofitting proposal and the retrofitted building model was found to satisfy controlled damage performance criteria envisaged in the local seismic code. It is believed that the methodology presented in this study can be effectively used in similar buildings with poor structural strength for identifying structural performance and selecting proper retrofitting practices.
{"title":"Nonlinear time history analysis of a low-story RC building: Comparison of the existing and retrofitted states","authors":"Mehmet Firat Karapinar, Baris Gunes, B. Sayın","doi":"10.31462/jseam.2023.01010026","DOIUrl":"https://doi.org/10.31462/jseam.2023.01010026","url":null,"abstract":"The current paper presents a seismic performance assessment of a low-story RC building through the time history analysis and a retrofitting proposal accordingly. The seismic analyses were repeated for the retrofitted building model and the effectiveness of the retrofitting proposal was determined. In the first stage of the study, the design project and material characteristics of the building were examined. Using these data, a 3D model of the building was prepared on the Midas Gen program. Next, a total of 11 earthquake records were selected and scaled for nonlinear time history analysis. Using the analysis results with the codes written on the Matlab program, the damage states of the load-bearing members were determined and the building’s performance was measured. The results indicated that some load-bearing members have insufficient strength and a retrofitting proposal was made accordingly. A building model was then prepared considering the retrofitting proposal and the retrofitted building model was found to satisfy controlled damage performance criteria envisaged in the local seismic code. It is believed that the methodology presented in this study can be effectively used in similar buildings with poor structural strength for identifying structural performance and selecting proper retrofitting practices.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128639807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-30DOI: 10.31462/jseam.2023.01045059
Gulten Tandogan Kibar, Esra Lakot Alemdag
Cross-laminated wood (CLT) material, which has many advantages, has been widely used in architectural designs as a building element and building material in recent years. It has been proven that CLT can also show high performance against ground vibrations, but it is also mentioned in the literature that some problems such as rupture, snagging, and breaking occur in the elements used in the connections of the walls to the floor and the ground. This study was conducted to examine the performance of fasteners used in CLT walls against lateral load. In this context, 4 CLT walls were produced and then 5 metal profiles were designed to be used in the connection of these walls with the foundation ground. CLT wall and connection profiles, created according to ASTM E 72 standards, have been tested in an experimental setup with different detail options. According to the test results, it was observed that some of the CLT walls and connection profiles showed high performance at maximum load, displacement, and stiffness values. As a result, it has been determined that the resistance of the CLT material against lateral earthquake load can be increased with the right fasteners, and the collapse time of the structure in the event of an earthquake can be indirectly extended.
交叉层合木(CLT)材料作为一种建筑构件和建筑材料，近年来在建筑设计中得到了广泛的应用，具有许多优点。事实证明，CLT也能表现出良好的抗地面振动性能，但在文献中也提到，在墙与地板和地面的连接中使用的元件会出现一些问题，如破裂、断裂和断裂。本研究的目的是检查CLT墙体中使用的紧固件抗侧载的性能。在这种情况下，制作了4个CLT墙，然后设计了5个金属型材，用于将这些墙与基础地面连接起来。根据ASTM E 72标准创建的CLT墙壁和连接型材已在具有不同细节选项的实验设置中进行了测试。根据试验结果，观察到一些CLT墙体和连接型材在最大荷载、位移和刚度值下表现出较高的性能。结果表明，选择合适的扣件可以提高CLT材料抗侧向地震荷载的能力，并可间接延长结构在地震作用下的倒塌时间。
{"title":"Strength of connection profiles used in cross-laminated timber walls under seismic load","authors":"Gulten Tandogan Kibar, Esra Lakot Alemdag","doi":"10.31462/jseam.2023.01045059","DOIUrl":"https://doi.org/10.31462/jseam.2023.01045059","url":null,"abstract":"Cross-laminated wood (CLT) material, which has many advantages, has been widely used in architectural designs as a building element and building material in recent years. It has been proven that CLT can also show high performance against ground vibrations, but it is also mentioned in the literature that some problems such as rupture, snagging, and breaking occur in the elements used in the connections of the walls to the floor and the ground. This study was conducted to examine the performance of fasteners used in CLT walls against lateral load. In this context, 4 CLT walls were produced and then 5 metal profiles were designed to be used in the connection of these walls with the foundation ground. CLT wall and connection profiles, created according to ASTM E 72 standards, have been tested in an experimental setup with different detail options. According to the test results, it was observed that some of the CLT walls and connection profiles showed high performance at maximum load, displacement, and stiffness values. As a result, it has been determined that the resistance of the CLT material against lateral earthquake load can be increased with the right fasteners, and the collapse time of the structure in the event of an earthquake can be indirectly extended.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114822017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-30DOI: 10.31462/jseam.2023.01070083
M. Arslan, Batuhan Aykanat, M. Emiroğlu
In this study, the fracture and mechanical behavior of glass fiber reinforced concrete (GFRC) are investigated comparatively. For this purpose, three-point bending tests were carried out on notched beams produced using GFRC with 1, 2, and 3 kg/m3 fiber contents and the dimension of 6, 12, and 24 mm to determine the fracture energy. Fracture energy values of the GFRC specimens were calculated by analyzing load versus crack mouth opening displacement (CMOD) curves. Compressive strength was determined using cube samples with the dimension of 150x150mm. Tensile strength and Modulus of elasticity were determined using notched beams with the dimensions of 48010050 mm. Also, notched beams were produced and tested in accordance with RILEM recommendations. In addition, microstructural analyses were performed based on Scanning Electron Microscopy and Energy-Dispersive X-ray Spectroscopy examinations. The results showed that the effects of fiber contents on fracture energy were very significant. However, the effect of fiber addition on the compressive strength and modulus of elasticity values was not significant.
{"title":"Effects of glass fiber usage on fracture energy and mechanical behavior of concrete: An experimental approach","authors":"M. Arslan, Batuhan Aykanat, M. Emiroğlu","doi":"10.31462/jseam.2023.01070083","DOIUrl":"https://doi.org/10.31462/jseam.2023.01070083","url":null,"abstract":"In this study, the fracture and mechanical behavior of glass fiber reinforced concrete (GFRC) are investigated comparatively. For this purpose, three-point bending tests were carried out on notched beams produced using GFRC with 1, 2, and 3 kg/m3 fiber contents and the dimension of 6, 12, and 24 mm to determine the fracture energy. Fracture energy values of the GFRC specimens were calculated by analyzing load versus crack mouth opening displacement (CMOD) curves. Compressive strength was determined using cube samples with the dimension of 150x150mm. Tensile strength and Modulus of elasticity were determined using notched beams with the dimensions of 48010050 mm. Also, notched beams were produced and tested in accordance with RILEM recommendations. In addition, microstructural analyses were performed based on Scanning Electron Microscopy and Energy-Dispersive X-ray Spectroscopy examinations. The results showed that the effects of fiber contents on fracture energy were very significant. However, the effect of fiber addition on the compressive strength and modulus of elasticity values was not significant.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129208263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-30DOI: 10.31462/jseam.2023.01060069
S. Saatci, Yonca Yasayanlar
Punching resistance in flat slab systems in reinforced concrete structures is often provided with drop panels or shear reinforcement around columns. Shear studs are effectively used in these structures as shear reinforcement. However, factory-made shear studs may not be available in all locations and small quantities for small projects. Therefore, cheap shear studs that can be manufactured from widely available materials in small quantities can be very useful in certain cases. In this study, shear studs manufactured from threaded bars, widely available in hardware stores, are used for providing punching resistance to flat slabs. Stud heads were formed with T-section nuts. Four slab specimens, two with shear studs and two without, were cast and tested under concentrated loads at their mid-point. The slabs had 2150×2150×150 mm dimensions and they were cast with two different longitudinal reinforcement ratios. Test results showed that manufactured shear studs significantly increased the load and deformation capacities of the slabs. Slabs with shear studs were able to show up to three times higher bending deformations and they were able to sustain up to 50% higher loads. The study has shown that these studs can be effectively used for punching strengthening purposes in flat plate systems or in other cases where punching resistance is needed.
{"title":"Efficiency of shear studs manufactured from threaded bars on the punching behavior of flat slabs","authors":"S. Saatci, Yonca Yasayanlar","doi":"10.31462/jseam.2023.01060069","DOIUrl":"https://doi.org/10.31462/jseam.2023.01060069","url":null,"abstract":"Punching resistance in flat slab systems in reinforced concrete structures is often provided with drop panels or shear reinforcement around columns. Shear studs are effectively used in these structures as shear reinforcement. However, factory-made shear studs may not be available in all locations and small quantities for small projects. Therefore, cheap shear studs that can be manufactured from widely available materials in small quantities can be very useful in certain cases. In this study, shear studs manufactured from threaded bars, widely available in hardware stores, are used for providing punching resistance to flat slabs. Stud heads were formed with T-section nuts. Four slab specimens, two with shear studs and two without, were cast and tested under concentrated loads at their mid-point. The slabs had 2150×2150×150 mm dimensions and they were cast with two different longitudinal reinforcement ratios. Test results showed that manufactured shear studs significantly increased the load and deformation capacities of the slabs. Slabs with shear studs were able to show up to three times higher bending deformations and they were able to sustain up to 50% higher loads. The study has shown that these studs can be effectively used for punching strengthening purposes in flat plate systems or in other cases where punching resistance is needed.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115086305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-30DOI: 10.31462/jseam.2023.01084097
Ayşegül Durmuş Demir
Reinforced concrete grouped silos-commonly employed in the industry to store granular materials- also needs to be designed in earthquake-prone areas. Silos experience a higher rate of structural failures than the majority of other types of construction. And one of the main causes of silo failure is the dynamic overpressures caused by stored materials under seismic loads. However, the principles determining loads on such structures and requirements for their structural analysis aren’t precisely specified in relevant codes of design. Instead of emphasizing grouped silos that interact strongly, the present dynamic design only concentrates on a single silo which can lead to unrealistic solutions for grouped silos. Therefore, it is necessary to determine the seismic behavior of grouped silos more accurately. This paper aims to investigate the seismic behavior of RC on-ground grouped silos compared to single ones by using a numerical model because of its adaptability, which allows for the analysis of a wide range of silo problems. In this context, a three-dimensional finite element model, that considered the interaction between stored material and silo wall as well as the continuity of the silo walls, was performed using ANSYS software. Two different aspect ratios and three different internal loading cases were taken into account for the parametric study to demonstrate their influences on dynamic overpressures and equivalent base shear forces in RC-grouped silos. It is concluded that designing the on-ground slender grouped silos with a high aspect ratio as individual single silos is unreasonable and may produce very low values for the base shear force.
{"title":"The behavior of the RC grouped silos under earthquake excitation according to different internal loadings","authors":"Ayşegül Durmuş Demir","doi":"10.31462/jseam.2023.01084097","DOIUrl":"https://doi.org/10.31462/jseam.2023.01084097","url":null,"abstract":"Reinforced concrete grouped silos-commonly employed in the industry to store granular materials- also needs to be designed in earthquake-prone areas. Silos experience a higher rate of structural failures than the majority of other types of construction. And one of the main causes of silo failure is the dynamic overpressures caused by stored materials under seismic loads. However, the principles determining loads on such structures and requirements for their structural analysis aren’t precisely specified in relevant codes of design. Instead of emphasizing grouped silos that interact strongly, the present dynamic design only concentrates on a single silo which can lead to unrealistic solutions for grouped silos. Therefore, it is necessary to determine the seismic behavior of grouped silos more accurately. This paper aims to investigate the seismic behavior of RC on-ground grouped silos compared to single ones by using a numerical model because of its adaptability, which allows for the analysis of a wide range of silo problems. In this context, a three-dimensional finite element model, that considered the interaction between stored material and silo wall as well as the continuity of the silo walls, was performed using ANSYS software. Two different aspect ratios and three different internal loading cases were taken into account for the parametric study to demonstrate their influences on dynamic overpressures and equivalent base shear forces in RC-grouped silos. It is concluded that designing the on-ground slender grouped silos with a high aspect ratio as individual single silos is unreasonable and may produce very low values for the base shear force.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131271514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-30DOI: 10.31462/jseam.2023.01001009
A. S. Tasligedik
Strength hierarchy assessment is a method developed to be able to identify the governing failure mechanisms at reinforced concrete (RC) beam-column joints. The main failures that can be identified in this method are: i) beam plastic hinge; ii) column plastic hinge/shear failure; iii) beam-column joint shear failure. Through the identification of the governing failure mode in a joint, the validity of the capacity design principles can be checked for the considered RC beam-column joint. The obtained observations can then be used in finding the most optimal repair/strengthening application. This method has been going through updates and developments in the last decade and new applications have emerged. In this article, a state-of-the-art summary of the procedure is reported with its most recent updates as well as its practical engineering applications.
{"title":"State-of-art summary of the strength hierarchy assessment and its applications","authors":"A. S. Tasligedik","doi":"10.31462/jseam.2023.01001009","DOIUrl":"https://doi.org/10.31462/jseam.2023.01001009","url":null,"abstract":"Strength hierarchy assessment is a method developed to be able to identify the governing failure mechanisms at reinforced concrete (RC) beam-column joints. The main failures that can be identified in this method are: i) beam plastic hinge; ii) column plastic hinge/shear failure; iii) beam-column joint shear failure. Through the identification of the governing failure mode in a joint, the validity of the capacity design principles can be checked for the considered RC beam-column joint. The obtained observations can then be used in finding the most optimal repair/strengthening application. This method has been going through updates and developments in the last decade and new applications have emerged. In this article, a state-of-the-art summary of the procedure is reported with its most recent updates as well as its practical engineering applications.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"45 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131716059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-31DOI: 10.31462/jseam.2022.04277288
G. Adıyaman
This study considers free vibration analysis of a porous functionally graded (FG) beam using a higher-order shear deformation theory (HSDT). The change in the material properties is described by a power law. The porosity distribution functions, one for even cases and two for uneven cases, are considered in the problem. The governing equations are derived utilizing Lagrange’s principle. The solution to the problem is carried out using FEM with a three-node and 12-DOF element. Dimensionless natural frequencies obtained in the present study are compared to those reported in four studies from the literature for validation purposes. The effect of material properties, porosity, and boundary conditions on the dimensionless neutral frequencies and mode shapes are investigated with the help of a parametric study.
{"title":"Free vibration analysis of a porous functionally graded beam using higher-order shear deformation theory","authors":"G. Adıyaman","doi":"10.31462/jseam.2022.04277288","DOIUrl":"https://doi.org/10.31462/jseam.2022.04277288","url":null,"abstract":"This study considers free vibration analysis of a porous functionally graded (FG) beam using a higher-order shear deformation theory (HSDT). The change in the material properties is described by a power law. The porosity distribution functions, one for even cases and two for uneven cases, are considered in the problem. The governing equations are derived utilizing Lagrange’s principle. The solution to the problem is carried out using FEM with a three-node and 12-DOF element. Dimensionless natural frequencies obtained in the present study are compared to those reported in four studies from the literature for validation purposes. The effect of material properties, porosity, and boundary conditions on the dimensionless neutral frequencies and mode shapes are investigated with the help of a parametric study.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"1085 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133310190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：