混凝土抗震框架变形能力弹塑性可靠度敏度分析

Sensitivity Analysis of Elastoplastic Time-History Reliability of Story-Drift Capacity of Aseismatic RC Frames

采用杆系 层模型,将改进的计算结构静力可靠度的JC法与Wilson θ法相结合,建立了钢筋混凝土抗震框架侧向变形能力弹塑性时程可靠度算法,并用此算法对影响钢筋混凝土抗震框架层间变形能力弹塑性时程可靠度的结构参数随机变量进行了敏度分析.结果表明,所有结构参数中,混凝土弹性模量和梁、柱截面尺寸的变异性对钢筋混凝土抗震框架层间变形能力弹塑性时程可靠度的影响最大;对于同一结构参数,其变异性对抗震框架层间变形能力弹塑性时程可靠度的影响在整个地震动过程中随时间变化.

An algorithm was proposed to analyze the elastoplastic time-history reliability of lateral deformation capacity of aseismatic reinforced concrete(RC) structures on the basis of the improved JC method for calculating the static reliability of structures, the Wilson-θ method and the member-story model. And this algorithm was used for the sensitivity analysis of structural parameters, as random variables, influencing the elastoplastic time-history reliability of the story-drift capacity of an aseismatic RC frame. The research result shows that in all the structural parameters, the elastic modulus of concrete and the sectional sizes of beams and columns of an aseismatic RC frame have the greatest effect on its time-history reliability, while as far as some structural parameter is concerned, its effect on the time-history reliability is changing in the whole process of an earthquake.