混凝土框架结构随机地震反应概率密度演化分析  

Probability density evolution analysis of stochastic seismic response of concrete frame structures

作　　者：宋鹏彦[1] 陈建兵[1,2] 万增勇 李杰[1,2] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《建筑结构学报》2015年第11期117-123,共7页Journal of Building Structures

基　　金：国家自然科学基金项目(11172210);土木工程防灾国家重点实验室开放课题(SLDRCE14-B-17)

摘　　要：结合概率密度演化理论与基于混凝土损伤本构关系的结构非线性分析方法,将结构随机反应分析从基于传统的从构件到结构的两层次简化模型,提升到从材料随机本构模型到结构的耦合精细化分析水平,实现了考虑结构参数随机性的多层混凝土框架结构非线性随机地震反应概率密度演化分析。进而,考虑混凝土与钢筋材料参数和结构阻尼参数的随机性,考察了结构主要反应量的随机演化特征。结果表明:与线性结构随机反应相比,由于混凝土随机损伤的影响,柱轴力与层间剪力的变异性差异显著,且层间剪力和层间位移的概率密度演化曲面不规则程度明显增加。The probability density evolution method and the advanced nonlinear analysis technique adopting damage constitutive law of concrete are incorporated,whereby the stochastic response analysis of structures based on traditional simplified component-structure two-level models is improved to the level of refined analysis involving stochastic constitutive law of material-structure coupling. Probability density evolution analysis of stochastic nonlinear response of multi-story concrete frame structures with random structural parameters is then implemented. Further,the randomness involved in concrete and steel materials and damping parameter is taken into account,and the properties of stochastic evolution of major responses are examined,showing that due to the effects of stochastic damage of concrete. Compared to the responses of linear structures,the variability of the axial force of column and the inter-story shear force changes a lot,whereas the probability density evolution surfaces of inter-story shear and inter-story drift tends to be more irregular.

关 键 词：混凝土框架结构 损伤本构关系 概率密度演化理论 地震反应 随机性 

分 类 号：TU375.4[建筑科学—结构工程] TU311.3