In order to apply the performance-based seismic design, an engineer must first find out whether the column is expected to fail in shear before or after flexural yielding. According to column failure characteristics an...In order to apply the performance-based seismic design, an engineer must first find out whether the column is expected to fail in shear before or after flexural yielding. According to column failure characteristics and failure mode of reinforced concrete column, the UW-PEER structure performance database was discussed and analyzed. In order to investigate the relevance of failure mode and factors such as longitudinal reinforcement ratio, transverse reinforcement ratio, hoop spacing to depth ratio, aspect ratio, shearing resistance demand to shear capacity ratio and axial load ratio, Fisher's discriminant analysis(FDA) of the above factors was carried out. A discriminant function was developed to identify column failure mode. Results show that three factors, i.e., Vp /Vn, hoop spacing to depth ratio and aspect ratio have important influence on the failure mode. The failure mode has less to do with longitudinal reinforcement ratio, transverse reinforcement ratio and axial load ratio. Through using these three factors and the model proposed, over 85.6% of the original grouped cases were correctly classified. The value of coefficient of Vp /Vn is the largest, which means that discriminant equation is most sensitive to the shearing resistance demand to shear capacity ratio.展开更多
为了对基于性能的结构抗震设计提供决策依据,提出可恢复指标对结构不同损伤机制的安全、经济和可恢复性进行对比评价.以体系恢复力(resilience of system)为基础,阐述给定烈度区下单体结构可恢复指标的计算方法和流程;对5种典型损伤机制...为了对基于性能的结构抗震设计提供决策依据,提出可恢复指标对结构不同损伤机制的安全、经济和可恢复性进行对比评价.以体系恢复力(resilience of system)为基础,阐述给定烈度区下单体结构可恢复指标的计算方法和流程;对5种典型损伤机制的RC框架结构,进行易损性分析和恢复力参数计算,得到结构可恢复指标;分析可恢复指标对各主要恢复力参数的敏感性,提出修正的给定烈度区下结构可恢复指标计算方法.结果表明:可恢复指标能够较全面地涵盖结构地震损失相关因素,体现结构的恢复力(即安全、经济和可恢复性);修正的结构可恢复指标能够较好地区分各损伤机制的恢复力,符合已有研究对各损伤机制优劣的定性判别.展开更多
基金Project(2011ZA05) supported by the State Key Laboratory’s Autonomous Project of Subtropical Building Science in South China University of Technology
文摘In order to apply the performance-based seismic design, an engineer must first find out whether the column is expected to fail in shear before or after flexural yielding. According to column failure characteristics and failure mode of reinforced concrete column, the UW-PEER structure performance database was discussed and analyzed. In order to investigate the relevance of failure mode and factors such as longitudinal reinforcement ratio, transverse reinforcement ratio, hoop spacing to depth ratio, aspect ratio, shearing resistance demand to shear capacity ratio and axial load ratio, Fisher's discriminant analysis(FDA) of the above factors was carried out. A discriminant function was developed to identify column failure mode. Results show that three factors, i.e., Vp /Vn, hoop spacing to depth ratio and aspect ratio have important influence on the failure mode. The failure mode has less to do with longitudinal reinforcement ratio, transverse reinforcement ratio and axial load ratio. Through using these three factors and the model proposed, over 85.6% of the original grouped cases were correctly classified. The value of coefficient of Vp /Vn is the largest, which means that discriminant equation is most sensitive to the shearing resistance demand to shear capacity ratio.
文摘为了对基于性能的结构抗震设计提供决策依据,提出可恢复指标对结构不同损伤机制的安全、经济和可恢复性进行对比评价.以体系恢复力(resilience of system)为基础,阐述给定烈度区下单体结构可恢复指标的计算方法和流程;对5种典型损伤机制的RC框架结构,进行易损性分析和恢复力参数计算,得到结构可恢复指标;分析可恢复指标对各主要恢复力参数的敏感性,提出修正的给定烈度区下结构可恢复指标计算方法.结果表明:可恢复指标能够较全面地涵盖结构地震损失相关因素,体现结构的恢复力(即安全、经济和可恢复性);修正的结构可恢复指标能够较好地区分各损伤机制的恢复力,符合已有研究对各损伤机制优劣的定性判别.
