Structures should be designed in the direction of providing different vital requirements such as safety, durability, strength besides comfortable, and serviceability needs to be intended for usage purposes. Also, an effective structural design must carry on the other significant conditions consisting of being economic, even not destructive to the environment via various hazardous effects. Within the scope of this study, to realize all mentioned aims, an optimization process was carried out to generate an eco‐friendly and cost‐effective structural model for a post‐tensioned axial symmetric reinforced concrete cylindrical wall. While this process is realized, three different metaheuristic algorithms as harmony search (HS), teaching–learning based optimization (TLBO), and flower pollination algorithm (FPA) were benefited to observe optimal parameters and main objective conditions of different variations produced intended for the wall structure. These optimal conditions contain optimal section size as the thickness of the wall, value of post‐tensioning loads, and their coordinates applied along the wall, besides the main purpose is to minimize of emission amount of carbon dioxide (CO2) from the utilized structural materials namely, concrete, steel reinforcements, and post‐tensioning cables. As doing this, optimal levels for arising costs of materials can also be observed at the same time. With this study, all of these processes were provided with respect to many design combinations by utilizing various strength alternatives for concrete and even steel reinforcement grades together with different structural properties such as wall height, specific weight of liquid within the wall, and number of post‐tensioning loads. By this means, it was made possible to generate both nature‐friendly, cost‐effective together with reliable and sustainable structures. The investigation of the optimum design was done for three cases. The first case was done for limited variation of design constants, and the best effective algorithm was found as FPA after the evaluation of results for multiple cycles of the optimization process. The other cases were done for different values of design constants by using the best algorithm. For the evaluation of the optimum cost for different countries, the most expensive ones are for Germany and Canada. As the final finding, the increase in the number of post‐tensioning loads reduces the CO2 emission in the optimum design.
{"title":"Generation of eco‐friendly design for post‐tensioned axially symmetric reinforced concrete cylindrical walls by minimizing of CO2 emission","authors":"G. Bekdaş, Melda Yucel, S. M. Nigdeli","doi":"10.1002/tal.1948","DOIUrl":"https://doi.org/10.1002/tal.1948","url":null,"abstract":"Structures should be designed in the direction of providing different vital requirements such as safety, durability, strength besides comfortable, and serviceability needs to be intended for usage purposes. Also, an effective structural design must carry on the other significant conditions consisting of being economic, even not destructive to the environment via various hazardous effects. Within the scope of this study, to realize all mentioned aims, an optimization process was carried out to generate an eco‐friendly and cost‐effective structural model for a post‐tensioned axial symmetric reinforced concrete cylindrical wall. While this process is realized, three different metaheuristic algorithms as harmony search (HS), teaching–learning based optimization (TLBO), and flower pollination algorithm (FPA) were benefited to observe optimal parameters and main objective conditions of different variations produced intended for the wall structure. These optimal conditions contain optimal section size as the thickness of the wall, value of post‐tensioning loads, and their coordinates applied along the wall, besides the main purpose is to minimize of emission amount of carbon dioxide (CO2) from the utilized structural materials namely, concrete, steel reinforcements, and post‐tensioning cables. As doing this, optimal levels for arising costs of materials can also be observed at the same time. With this study, all of these processes were provided with respect to many design combinations by utilizing various strength alternatives for concrete and even steel reinforcement grades together with different structural properties such as wall height, specific weight of liquid within the wall, and number of post‐tensioning loads. By this means, it was made possible to generate both nature‐friendly, cost‐effective together with reliable and sustainable structures. The investigation of the optimum design was done for three cases. The first case was done for limited variation of design constants, and the best effective algorithm was found as FPA after the evaluation of results for multiple cycles of the optimization process. The other cases were done for different values of design constants by using the best algorithm. For the evaluation of the optimum cost for different countries, the most expensive ones are for Germany and Canada. As the final finding, the increase in the number of post‐tensioning loads reduces the CO2 emission in the optimum design.","PeriodicalId":49470,"journal":{"name":"Structural Design of Tall and Special Buildings","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2022-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42162093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, the robust control of a real high‐rise tower is studied, using a newly proposed, in the structural control field, Robust Model Predictive Control scheme (RMPC). Two RMPC controllers were designed considering either displacement mitigation (RMPC1) or power consumption efficiency (RMPC2). The two controllers were compared to the benchmark, robustness‐wise, H∞ control scheme to demonstrate their relative performance. A number of stiffness and damping uncertainty scenarios were designed based on a broad study of the relevant literature, in order to estimate the robustness of each of the three controllers. In all scenarios, variable actuator uncertainty of ±5% was introduced. It was found that all controllers are effective in controlling the tower and demonstrate robustness against parametric and actuator uncertainties with different relative merits over each other. Indicatively, when considering root‐mean‐square (RMS) and peak displacement and acceleration reduction, the H∞ had an average performance reduction of 24%, the RMPC1 31% and the RMPC2 28% against their uncontrolled equivalent.
{"title":"Robust structural control of a real high‐rise tower equipped with a hybrid mass damper","authors":"L. Koutsoloukas, N. Nikitas, P. Aristidou","doi":"10.1002/tal.1941","DOIUrl":"https://doi.org/10.1002/tal.1941","url":null,"abstract":"In this paper, the robust control of a real high‐rise tower is studied, using a newly proposed, in the structural control field, Robust Model Predictive Control scheme (RMPC). Two RMPC controllers were designed considering either displacement mitigation (RMPC1) or power consumption efficiency (RMPC2). The two controllers were compared to the benchmark, robustness‐wise, H∞ control scheme to demonstrate their relative performance. A number of stiffness and damping uncertainty scenarios were designed based on a broad study of the relevant literature, in order to estimate the robustness of each of the three controllers. In all scenarios, variable actuator uncertainty of ±5% was introduced. It was found that all controllers are effective in controlling the tower and demonstrate robustness against parametric and actuator uncertainties with different relative merits over each other. Indicatively, when considering root‐mean‐square (RMS) and peak displacement and acceleration reduction, the H∞ had an average performance reduction of 24%, the RMPC1 31% and the RMPC2 28% against their uncontrolled equivalent.","PeriodicalId":49470,"journal":{"name":"Structural Design of Tall and Special Buildings","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2022-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41786971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Robert Z. C. Lim, D. Looi, H. Tsang, John L. Wilson
Volumetric building (VB) is a type of off‐site construction to move towards high productivity construction. Literature review shows that there are only few models for upstream feasibility study for VB, while many researchers delved into advanced structural engineering aspects of VB modeling (i.e., downstream detailed and technical design). However, there is a lack of guidance for the preliminary design of VB, which is an essential stage that falls in between upstream feasibility study and downstream detailed and technical design. Hence, this paper is written to fill that gap by proposing a new design tool for VB, anchored upon the “desire path” philosophy, which is often used in urban planning, that is, natural formations evident from preceding experiences. Literature review also shows that a comprehensive VB database is not available. Hence, a new database is collected with 31,185 units of modules and 911 module types, sourced from VB projects worldwide to provide a broad global overview. The proposed tool has a systematic framework of a four‐quadrant plot for preliminary VB design, enabling designers to determine the number of modules, size of modules, massing typology, and module construction material through new empirical relationships.
{"title":"A preliminary design tool for volumetric buildings","authors":"Robert Z. C. Lim, D. Looi, H. Tsang, John L. Wilson","doi":"10.1002/tal.1946","DOIUrl":"https://doi.org/10.1002/tal.1946","url":null,"abstract":"Volumetric building (VB) is a type of off‐site construction to move towards high productivity construction. Literature review shows that there are only few models for upstream feasibility study for VB, while many researchers delved into advanced structural engineering aspects of VB modeling (i.e., downstream detailed and technical design). However, there is a lack of guidance for the preliminary design of VB, which is an essential stage that falls in between upstream feasibility study and downstream detailed and technical design. Hence, this paper is written to fill that gap by proposing a new design tool for VB, anchored upon the “desire path” philosophy, which is often used in urban planning, that is, natural formations evident from preceding experiences. Literature review also shows that a comprehensive VB database is not available. Hence, a new database is collected with 31,185 units of modules and 911 module types, sourced from VB projects worldwide to provide a broad global overview. The proposed tool has a systematic framework of a four‐quadrant plot for preliminary VB design, enabling designers to determine the number of modules, size of modules, massing typology, and module construction material through new empirical relationships.","PeriodicalId":49470,"journal":{"name":"Structural Design of Tall and Special Buildings","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2022-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48037710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Structures with an asymmetric plan have proved to be severely vulnerable during the past earthquakes. The vulnerability may arise due to the uneven distribution of stiffness or mass. Most of the research focused on studying the eccentricity arising due to the irregular stiffness distribution. On the other hand, the systems with mass eccentricity arising due to the uneven distribution of mass at floor level are given relatively little attention. Hence, the present paper comprehensively studied the stiffness and mass eccentric systems together. In each case, the structure is subjected to bidirectional components of ground motion, which reflects the real situation more closely. So, for the lateral load‐resisting elements (columns), effect of biaxial interaction due to simultaneous bidirectional movement is included in the hysteresis behavior as explained in the paper to make a reasonably accurate prediction. Primarily idealized single‐story systems were used to study how asymmetric structures are vulnerable if they have stiffness or mass eccentricity. Further, the three‐story asymmetric systems were also included in the scope of the study to observe the effect of higher modes. To simulate a more practical situation, the present paper considers higher eccentricity in the first story of the three‐story system due to functional reasons, while the upper stories have lesser eccentricities compared to the first story. The present study shows that mass eccentric systems are equally vulnerable to earthquakes as stiffness eccentric systems. Further, three‐story systems show a manifold increase in response compared to its single‐story counterparts. Such a study may help to develop more insight into the generic behavior of plan asymmetric systems, leading to the improvement of design guidelines.
{"title":"Inelastic seismic behavior of asymmetric structures with mass and stiffness eccentricity under bidirectional ground motions","authors":"Md Ahsaan Hussain, S. C. Dutta","doi":"10.1002/tal.1947","DOIUrl":"https://doi.org/10.1002/tal.1947","url":null,"abstract":"Structures with an asymmetric plan have proved to be severely vulnerable during the past earthquakes. The vulnerability may arise due to the uneven distribution of stiffness or mass. Most of the research focused on studying the eccentricity arising due to the irregular stiffness distribution. On the other hand, the systems with mass eccentricity arising due to the uneven distribution of mass at floor level are given relatively little attention. Hence, the present paper comprehensively studied the stiffness and mass eccentric systems together. In each case, the structure is subjected to bidirectional components of ground motion, which reflects the real situation more closely. So, for the lateral load‐resisting elements (columns), effect of biaxial interaction due to simultaneous bidirectional movement is included in the hysteresis behavior as explained in the paper to make a reasonably accurate prediction. Primarily idealized single‐story systems were used to study how asymmetric structures are vulnerable if they have stiffness or mass eccentricity. Further, the three‐story asymmetric systems were also included in the scope of the study to observe the effect of higher modes. To simulate a more practical situation, the present paper considers higher eccentricity in the first story of the three‐story system due to functional reasons, while the upper stories have lesser eccentricities compared to the first story. The present study shows that mass eccentric systems are equally vulnerable to earthquakes as stiffness eccentric systems. Further, three‐story systems show a manifold increase in response compared to its single‐story counterparts. Such a study may help to develop more insight into the generic behavior of plan asymmetric systems, leading to the improvement of design guidelines.","PeriodicalId":49470,"journal":{"name":"Structural Design of Tall and Special Buildings","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2022-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41596585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To study the restoring force model of steel‐recycled concrete composite frame with infilled recycled block wall, the experimental results of two recycled concrete‐filled steel tube frames with infilled recycled block walls and three steel‐reinforced recycled concrete frames with infilled recycled block walls under low cyclic loading were analyzed. The four broken‐line skeleton curve model which was suitable for this kind of composite frame was proposed, and the calculation methods for different stages of the skeleton curve were given respectively. According to the hysteretic characteristics of different frame specimens, the hysteretic loops for steel‐recycled concrete composite frame with infilled recycled block wall were simplified by using the treat methods of positive and negative symmetry and sudden drop of bearing capacity, and the restoring force model for different type of steel‐recycled concrete composite frame with infilled recycled block wall was established. At the same time, combing the experimental results, the proposed restoring force model was verified. The results show that the established restoring force model can predict the hysteretic behavior of steel‐recycled concrete composite frame with infilled recycled block wall well, and it can provide theoretical support for the elastic–plastic time history analysis of this kind of frame structures under earthquake.
{"title":"Restoring force model of steel‐recycled concrete composite frame with infilled recycled block wall","authors":"E. Meng, Yalin Yu, Xianggang Zhang, Y. Su","doi":"10.1002/tal.1944","DOIUrl":"https://doi.org/10.1002/tal.1944","url":null,"abstract":"To study the restoring force model of steel‐recycled concrete composite frame with infilled recycled block wall, the experimental results of two recycled concrete‐filled steel tube frames with infilled recycled block walls and three steel‐reinforced recycled concrete frames with infilled recycled block walls under low cyclic loading were analyzed. The four broken‐line skeleton curve model which was suitable for this kind of composite frame was proposed, and the calculation methods for different stages of the skeleton curve were given respectively. According to the hysteretic characteristics of different frame specimens, the hysteretic loops for steel‐recycled concrete composite frame with infilled recycled block wall were simplified by using the treat methods of positive and negative symmetry and sudden drop of bearing capacity, and the restoring force model for different type of steel‐recycled concrete composite frame with infilled recycled block wall was established. At the same time, combing the experimental results, the proposed restoring force model was verified. The results show that the established restoring force model can predict the hysteretic behavior of steel‐recycled concrete composite frame with infilled recycled block wall well, and it can provide theoretical support for the elastic–plastic time history analysis of this kind of frame structures under earthquake.","PeriodicalId":49470,"journal":{"name":"Structural Design of Tall and Special Buildings","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2022-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44045472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuan-han Wang, Ying Zhou, Liming Zhu, Tongsheng Zhang, Baiqu Jia, Song Han, Zheng Lu
Due to creep and shrinkage of concrete, the long‐term structural deformation is one of the hottest topics in the study of super high‐rise structures. For the frame–eccentrical core tube structure, its long‐term deformation includes both vertical deformation and obvious horizontal deformation, which will have an inevitable influence on the structural verticality. The horizontal deformation and its formation mechanism in frame–eccentrical core tube structure are studied in this paper. Based on the finite element software ETABS, a refined finite element model combining with the time‐dependent material model of concrete is established base on a subsistent structure. According to the actual construction conditions, construction analysis is conducted, and the construction deformation and the long‐term deformation after completion are subsequently studied. Based on the results of construction analysis, the effects of elastic modulus, creep, and shrinkage on structural horizontal deformation are analyzed; furthermore, the horizontal deformation characteristics of different structural members in different periods are compared. The results show that the horizontal deformation is related to the vertical deformation of the component, and creep and shrinkage exert opposite effects on the structural horizontal deformation. Besides, the creep and shrinkage are the dominant factors of the horizontal deformation in the later stage. These results are supported by real deformation data obtained from real‐time deformation monitoring during construction, which proves the effectiveness of the method adopted in this paper.
{"title":"Horizontal deformation and construction analysis of frame–eccentrical core tube structure","authors":"Yuan-han Wang, Ying Zhou, Liming Zhu, Tongsheng Zhang, Baiqu Jia, Song Han, Zheng Lu","doi":"10.1002/tal.1943","DOIUrl":"https://doi.org/10.1002/tal.1943","url":null,"abstract":"Due to creep and shrinkage of concrete, the long‐term structural deformation is one of the hottest topics in the study of super high‐rise structures. For the frame–eccentrical core tube structure, its long‐term deformation includes both vertical deformation and obvious horizontal deformation, which will have an inevitable influence on the structural verticality. The horizontal deformation and its formation mechanism in frame–eccentrical core tube structure are studied in this paper. Based on the finite element software ETABS, a refined finite element model combining with the time‐dependent material model of concrete is established base on a subsistent structure. According to the actual construction conditions, construction analysis is conducted, and the construction deformation and the long‐term deformation after completion are subsequently studied. Based on the results of construction analysis, the effects of elastic modulus, creep, and shrinkage on structural horizontal deformation are analyzed; furthermore, the horizontal deformation characteristics of different structural members in different periods are compared. The results show that the horizontal deformation is related to the vertical deformation of the component, and creep and shrinkage exert opposite effects on the structural horizontal deformation. Besides, the creep and shrinkage are the dominant factors of the horizontal deformation in the later stage. These results are supported by real deformation data obtained from real‐time deformation monitoring during construction, which proves the effectiveness of the method adopted in this paper.","PeriodicalId":49470,"journal":{"name":"Structural Design of Tall and Special Buildings","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2022-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44233068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hadis Vakili Sadeghi, S. R. Mirghaderi, S. Epackachi, Masoumeh Asgarpoor, Ali Gharavi
Steel‐plate composite (SC) walls can be connected to a concrete basemat using a base plate and a set of anchors eccentric to the wall. The base plate can be separated into two parts so that the concrete of the wall and basemat is cohesive, and thus, the wall can be manufactured more easily and economically. Additionally, compression and shear demand are directly transferred from infill concrete to concrete basemat. Another change in the base plate connection of available tested walls involves transferring anchors to the bottom of faceplates. As a result of this modification, the base plate is removed from the force transmission chain, and the force is transferred directly from the wall to the anchors. After presenting the design criteria for this type of connection, three test walls with concrete foundations were verified in LS‐Dyna. The walls were modeled with a split base plate connection and concentric anchors, and then compared to other types of wall‐basemat connections. Three rectangular sections were then chosen as benchmarks and modeled with three anchors of different sizes to evaluate the effect of this parameter on walls behavior. The design equations presented for the single base plate connection were found applicable to design split base plate connections. Then all walls were compared to the test wall‐fixed base wall connection. Finally, the models were analyzed with elastic walls to determine whether the foundation is stronger than the wall. The split base plate connection with concentric anchors was found to be stronger than connected parts and can be an alternative to existing connections.
{"title":"Numerical study on split base plate connection with concentric anchors between steel‐plate composite wall and concrete basemat","authors":"Hadis Vakili Sadeghi, S. R. Mirghaderi, S. Epackachi, Masoumeh Asgarpoor, Ali Gharavi","doi":"10.1002/tal.1937","DOIUrl":"https://doi.org/10.1002/tal.1937","url":null,"abstract":"Steel‐plate composite (SC) walls can be connected to a concrete basemat using a base plate and a set of anchors eccentric to the wall. The base plate can be separated into two parts so that the concrete of the wall and basemat is cohesive, and thus, the wall can be manufactured more easily and economically. Additionally, compression and shear demand are directly transferred from infill concrete to concrete basemat. Another change in the base plate connection of available tested walls involves transferring anchors to the bottom of faceplates. As a result of this modification, the base plate is removed from the force transmission chain, and the force is transferred directly from the wall to the anchors. After presenting the design criteria for this type of connection, three test walls with concrete foundations were verified in LS‐Dyna. The walls were modeled with a split base plate connection and concentric anchors, and then compared to other types of wall‐basemat connections. Three rectangular sections were then chosen as benchmarks and modeled with three anchors of different sizes to evaluate the effect of this parameter on walls behavior. The design equations presented for the single base plate connection were found applicable to design split base plate connections. Then all walls were compared to the test wall‐fixed base wall connection. Finally, the models were analyzed with elastic walls to determine whether the foundation is stronger than the wall. The split base plate connection with concentric anchors was found to be stronger than connected parts and can be an alternative to existing connections.","PeriodicalId":49470,"journal":{"name":"Structural Design of Tall and Special Buildings","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2022-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44546218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Box steel columns have significant advantages compared with H‐columns. However, box steel columns have the detrimental tendency of developing a plastic hinge at the column panel zone due to stress concentration. One of the methods for moving the concentration of the stresses at the column panel zone is to use a reduced beam. Nevertheless, a reduced beam decreases the capacity of the beam. This paper proposes a solution to the plastic hinge location without reducing the capacity of the beam. In this study, 106 connection configurations were numerically investigated using ABAQUS software. Two relevant experimental studies were used to validate the modeling techniques. The proposed joint was classified as semi‐rigid and full strength according to Eurocode‐3. To predict the cyclic behavior of the proposed connection, analytical simulation was performed using a Matlab program that uses the Richard and Abbot function. The program was able to accurately reproduce the connection behavior. Through parametric studies, the influence of plate thickness, column, and beam geometry on the connection's initial stiffness and moment resistance was examined. Finally, by using regression analysis, linear functions capable of predicting the initial stiffness and moment resistance of the connection were proposed.
{"title":"Development of a novel I‐beam to box column connection with welded steel plates","authors":"Moussa Twizere, K. Taşkın","doi":"10.1002/tal.1940","DOIUrl":"https://doi.org/10.1002/tal.1940","url":null,"abstract":"Box steel columns have significant advantages compared with H‐columns. However, box steel columns have the detrimental tendency of developing a plastic hinge at the column panel zone due to stress concentration. One of the methods for moving the concentration of the stresses at the column panel zone is to use a reduced beam. Nevertheless, a reduced beam decreases the capacity of the beam. This paper proposes a solution to the plastic hinge location without reducing the capacity of the beam. In this study, 106 connection configurations were numerically investigated using ABAQUS software. Two relevant experimental studies were used to validate the modeling techniques. The proposed joint was classified as semi‐rigid and full strength according to Eurocode‐3. To predict the cyclic behavior of the proposed connection, analytical simulation was performed using a Matlab program that uses the Richard and Abbot function. The program was able to accurately reproduce the connection behavior. Through parametric studies, the influence of plate thickness, column, and beam geometry on the connection's initial stiffness and moment resistance was examined. Finally, by using regression analysis, linear functions capable of predicting the initial stiffness and moment resistance of the connection were proposed.","PeriodicalId":49470,"journal":{"name":"Structural Design of Tall and Special Buildings","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2022-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46821736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Simple pendulum vibration absorbers, as one of the most common models of absorbers, experience nonlinear behaviors in the large amplitude of oscillations, and under such conditions, they are not effective enough and are more prone to lose their stability. To overcome some of these drawbacks, a complementary damping mechanism including two nonlinear elements is introduced. Alongside the ordinary linear viscous damper, a damping mechanism is also utilized to control the oscillations of the dynamic structure exposed to the excitation forces more intense than the ones considered in the optimization. In other words, they make this system more robust and stable in the face of excitations stronger than the presupposed conditions. The complementary elements of this mechanism are proposed to offer an appropriate approximation of various likely models which can be used as practical nonlinear damping mechanisms. The steady‐state solutions of the nonlinear governing equations are achieved with pinpoint precision with the help of the harmonic balance method and more precise approximations of trigonometric functions. To enhance the impacts of this mechanism, optimization is performed for a compound objective function in addition to the conventional one. This study explains how such mechanisms are capable of contributing to the higher robustness and stability of pendulum vibration absorbers under a wider range of excitation intensities. The performance of this absorber is also studied for an N‐story shear structure as a multidegree of freedom (MDOF) system.
{"title":"Pendulum vibration absorber with a nonlinear viscous damping mechanism","authors":"Sam Fallahpasand, M. Dardel, M. Pashaei","doi":"10.1002/tal.1939","DOIUrl":"https://doi.org/10.1002/tal.1939","url":null,"abstract":"Simple pendulum vibration absorbers, as one of the most common models of absorbers, experience nonlinear behaviors in the large amplitude of oscillations, and under such conditions, they are not effective enough and are more prone to lose their stability. To overcome some of these drawbacks, a complementary damping mechanism including two nonlinear elements is introduced. Alongside the ordinary linear viscous damper, a damping mechanism is also utilized to control the oscillations of the dynamic structure exposed to the excitation forces more intense than the ones considered in the optimization. In other words, they make this system more robust and stable in the face of excitations stronger than the presupposed conditions. The complementary elements of this mechanism are proposed to offer an appropriate approximation of various likely models which can be used as practical nonlinear damping mechanisms. The steady‐state solutions of the nonlinear governing equations are achieved with pinpoint precision with the help of the harmonic balance method and more precise approximations of trigonometric functions. To enhance the impacts of this mechanism, optimization is performed for a compound objective function in addition to the conventional one. This study explains how such mechanisms are capable of contributing to the higher robustness and stability of pendulum vibration absorbers under a wider range of excitation intensities. The performance of this absorber is also studied for an N‐story shear structure as a multidegree of freedom (MDOF) system.","PeriodicalId":49470,"journal":{"name":"Structural Design of Tall and Special Buildings","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2022-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44737399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Issue Information","authors":"","doi":"10.1002/tal.1872","DOIUrl":"https://doi.org/10.1002/tal.1872","url":null,"abstract":"No abstract is available for this article.","PeriodicalId":49470,"journal":{"name":"Structural Design of Tall and Special Buildings","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43531414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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