近场地震下抗弯钢框架基于能量的性态设计方法  

Performance-based seismic design method of the moment-resisting steel frame under the near-fault earthquake using MECE spectrum

作　　者：倪永慧 顾强[1] 

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《苏州科技学院学报（工程技术版）》2016年第3期1-9,共9页Journal of Suzhou University of Science and Technology （Engineering and Technology）

基　　金：国家自然科学基金项目(51278320)

摘　　要：结构在近断层地震下的损伤往往与强速度脉冲所携带的瞬时输入能量相关。为考虑近场地面运动的脉冲效应,根据结构单向推覆耗能能力大于或等于速度脉冲瞬间输入能量的原则,基于最大有效滞回耗能(Maximum Effect Cyclic Energy,MECE)谱,提出了近场地震下抗弯钢框架基于能量的性态设计方法 ,结合设计实例给出了设计步骤、构件滞回耗能计算公式及构件截面设计方法;对设计实例进行了Pushover和时程分析,结果表明结构呈现了渐进式破坏模式,符合设计预期,屈服位移与设计预期相差较小,多遇及罕遇地震下结构层间侧移角符合规范要求且各层位移相对平均,滞回耗能在构件中的分布及层间分布也较合理,证明了设计方法的可信性。The damage of buildings under the near-fauh earthquakes was related to the instantaneous input ener- gy. In order to reflect the near-fauh pulse effect, the performance-based seismic design method of the moment- resisting steel frame using the maximum effect cyclic energy （MECE） spectrum was proposed according to the principle that the structure of one-way pushover dissipation energy was greater than or equal to the input energy. In this paper, the calculating formulas of the hysteric energy of the main steel components including steel beam and column were constructed, and the determining method of the cross section of steel components were also pro- posed. A moment-resisting steel frame was designed based on this new design method, and the seismic behavior was evaluated by the pushover analysis and nonlinear time history method. The analytical results show that the moment-resisting steel frame structure exhibits the ideal progressively developed plastic mechanism; the maximum average drift of the moment-resisting steel frame can satisfy the deformation requirement of the Chinese seismic code under frequent and rare earthquake levels,and the hysteretic energy distribution in component and story is reasonable. The reliability of this design method is verified.

关 键 词：近场地震 抗弯钢框架 滞回能 性态设计方法 

分 类 号：TU391[建筑科学—结构工程]