摘要
结构的抗震性能评估中包含许多不确定性因素。当掌握的不确定性信息较少时,概率模型结果是值得怀疑的。本文首先采用双界限凸集模型考虑地面运动加速度峰值和反应谱特征周期的不确定性,并结合我国现行抗震设计规范中的反应谱,求得结构层间剪力的变异区间,在此基础上给出了一种新的界限侧向加载方式;并进一步将凸集理论融于pushover分析过程中,分析了由pushover得到的结构能力的界限变化区间。结果表明本文給出的界限pushover方法能给出性态指标的变化区间,是一种更客观可靠的抗震性能评估方法。
Many uncertain factors are involved in seismic performance evaluation and the probabilistic results drawn from inadequate information are suspectable. Considering the uncertainties of peak acceleration and frequency characteristics by using a bounded convex set model, the bounds of shear forces are derived from the Chinese seismic code, and then a new lateral bound load method for pushover analysis is proposed. Then the convex analysis method is integrated into pushover analysis to study the bounds of structural capacity. As a result, the convex modelbased pushover analysis makes an estimation of the performance of structure with an interval, and it is more objective and robust with respect to probabilistic perspective.
出处
《地震工程与工程振动》
CSCD
北大核心
2006年第5期81-87,共7页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(50478017)
