钢筋混凝土框架小震时程可靠度参数敏度分析
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摘要
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 timehistory reliabilities of the antilateral displacement capacity of a reinforced concrete (RC) frame and the loadbearing capacity of its elements to its structure parameters under frequent earthquakes is analyzed using the timehistory reliability algorithm. In addition, the effect of the correlation coefficient of seismic acceleration, as a random variable, on the timehistory 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 timehistory reliabilities of the loadbearing 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 timehistory reliabilities of the antilateral displacement capacity of RC frames.
The sensitivity of the timehistory reliabilities of the antilateral displacement capacity of a reinforced concrete (RC) frame and the loadbearing capacity of its elements to its structure parameters under frequent earthquakes is analyzed using the timehistory reliability algorithm. In addition, the effect of the correlation coefficient of seismic acceleration, as a random variable, on the timehistory 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 timehistory reliabilities of the loadbearing 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 timehistory reliabilities of the antilateral displacement capacity of RC frames.
引文
[1] 陈颖,张新培,朱长春.小震作用下钢筋混凝土框架的时程可靠度分析[J].西南交通大学学报,2003;38(2):169 172.
[2] 中华人民共和国城乡建设环境保护部.GBJ10 89 1989混凝土结构设计规范[S].北京:中国建工业出版社,1989.
[3] 陈颖.小震作用下混凝土结构的承载能力和变形能力时程可靠度分析[D].成都:四川大学建筑学院,2001.
[4] 欧进萍,牛荻涛,杜修力.设计用随机变量的模型及其参数确定[J].地震工程与工程振动,1991;11(3):107 113.
[2] 中华人民共和国城乡建设环境保护部.GBJ10 89 1989混凝土结构设计规范[S].北京:中国建工业出版社,1989.
[3] 陈颖.小震作用下混凝土结构的承载能力和变形能力时程可靠度分析[D].成都:四川大学建筑学院,2001.
[4] 欧进萍,牛荻涛,杜修力.设计用随机变量的模型及其参数确定[J].地震工程与工程振动,1991;11(3):107 113.
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