摘要
基于规范格式的抗震设计侧向力模式主要是基于弹性结构系统的动力特性获得的,这与强震下结构的非线性地震响应具有不兼容性,不能很好的预测和控制结构的地震损伤。基于强震均匀损伤的抗震理念,提出了滞变性能退化结构体系抗震设计的新型侧向力模式。建立了以峰值指向性改进I-K模型为基础的分析模型,构建了结构的均匀损伤优化设计程序,系统研究了收敛参数、地震动特性、目标延性、结构周期、阻尼比、软化刚度系数、材料延性能力、材料循环退化速度等对新型侧向力模式的影响。提出了以结构基本周期、目标延性和楼层相对高度为变量的新型侧向力模式量化表达式。结果表明,采用新型侧向力模式设计的结构,能实现结构的损伤分布均匀化,降低结构的地震响应,提高结构的抗震性能。
The current code-conforming seismic lateral load patterns are implicitly derived based on the dynamic solutions of elastic structural systems,and there is a discrepancy with the nonlinear seismic response of deteriorating structural systems subjected to strong earthquakes,which makes the seismic damage cannot be predicted and controlled.In this paper,a new seismic lateral load pattern was proposed for deteriorating structural systems,based on the concept of uniform damage distribution.The peak-oriented modified I-K model was employed to construct the analytical model,and an optimization design procedure for uniform damage distribution was developed.The influence of main parameters on the new lateral load pattern was comprehensively investigated,including the convergence parameter,ground motion characteristic,target ductility,period,damping ratio,softening stiffness factor,material ductility ability and material cycle degradation rate.The quantified expression of the new lateral load distribution was proposed as a function of fundamental period,the target ductility and story relative height.The results show that the structures designed according to the proposed lateral force pattern achieved a uniform distribution of seismic damage,reduced the seismic response and enhanced the seismic response.
作者
白久林
孙博豪
金双双
BAI Jiulin;SUN Bohao;JIN Shuangshuang(Key Laboratory of New Technology for Construction of Cities in Mountain Area,Ministry of Education,Chongqing University,Chongqing 400045,China;School of Civil Engineering,Chongqing University,Chongqing,400045,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing,400074,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2021年第20期223-231,共9页
Journal of Vibration and Shock
基金
国家自然科学基金(51608073,51978109)。
关键词
均匀损伤
侧向力模式
抗震性能
优化设计
抗震设计
uniform damage
lateral force distribution pattern
seismic performance
optimization design
seismic design
