钢筋混凝土框架小震时程可靠度参数敏度分析

Sensitivity Analysis of Time-History Reliability of Reinforced Concrete Frames under Frequent Earthquakes

采用时程可靠度算法,对小震作用下影响钢筋混凝土框架抗侧向变形能力时程可靠度及其梁、柱单元承载能力时程可靠度的结构参数随机变量进行了敏度分析,并讨论了地震地面运动加速度切口随机变量相关系数的影响.结果表明,构件截面尺寸、层质量、配筋率和钢筋强度变异对框架梁、柱承载能力时程可靠指标影响较大;钢筋混凝土弹性模量、构件截面尺寸和阻尼比变异对框架抗侧向变形能力时程可靠指标有较大影响.

The sensitivity of the timehistory reliabilities of the antilateral displacement capacity of a reinforced concrete (RC) frame and the loadbearing capacity of its elements to its structure parameters under frequent earthquakes is analyzed using the timehistory reliability algorithm. In addition, the effect of the correlation coefficient of seismic acceleration, as a random variable, on the timehistory reliability is discussed. The result shows that changes in the section size of beams and columns, the mass of a storey, the ratio of reinforcement and the strength of steel bars have a great effect on the timehistory reliabilities of the loadbearing capacity of beams and columns of a RC farme, while the variations of the elastic modulus of RC, the section size of beams and columns and the ratio of damping will influence the timehistory reliabilities of the antilateral displacement capacity of RC frames.