摘要
钢框架结构在强地震作用下将进入非线性状态,结构的刚度和强度等力学性能随之降低,从而影响到结构以后的抗震性能。因此,如何确定结构在一次或多次地震作用后的力学性能,是结构在多次地震作用下动力分析的重要内容,为了达到这个目的,首先需要确定结构在每次地震作用后各层的累积损伤指数,再通过损伤指数来定量确定结构的剩余刚度和剩余强度。本文通过钢框架结构的多次振动台模拟试验,应用损伤力学理论,建立钢框架结构在地震作用下考虑损伤累积效应的双线性恢复力模型,结构在地震作用下的动力分析采用层间模型,并运用Wilson-θ法进行计算分析,通过试验和计算的对比,在多次地震作用后,由于框架结构的层间模型产生了强度和刚度的退化,考虑损伤累积效应后的计算结果更符合试验结果,最终为地震作用后的结构的修复和抗震能力的评估提供分析基础。
Steel frame structure will be in nonlinear state under strong earthquake with its mechanic properties of stiffness and strength degraded. This degradation has significant effect on seismic performance of structure later on. So how to evaluate the mechanic properties of structures under several earthquakes becomes quite important for dynamic analysis of structure under earthquakes. To serve the purpose, it must establish the accumulated damage index of every storey under earthquakes, then using the damage index to establish the degraded stiffness and the degraded strength. In this paper,based on the shaking table simulating tests and the damage mechanics, the cumulated damage model of steel frame structures under earthquakes, as well as the program based on the method of Wilson-O for calculating the damage of each story are put forward. In comparison with the calculated result and the experimental result, the cumulated damage model is proved to be right and feasible, and can offer the help to renovate the damaged structures caused by earthquakes and to evaluate the aseismic ability of structures.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2004年第3期69-74,共6页
Journal of Building Structures
基金
国家自然科学基金(59778042)
