梁端反对称静力加载模式下PC框架节点概率受力性能分析  

Analysis of probabilistic force performance of PC frame joints under antisymmetric static loading at beam ends

作　　者：宋鹏彦 王晨 赵仰康 陈伟宏[2] SONG Pengyan;WANG Chen;ZHAO Yangkang;CHEN Weihong(College of Civil Engineering and Architecture,Hebei University,Baoding 071002,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]河北大学建筑工程学院,河北保定071002 [2]福州大学土木工程学院,福建福州350108

出　　处：《地震工程与工程振动》2022年第4期154-161,共8页Earthquake Engineering and Engineering Dynamics

基　　金：中国地震局工程力学研究所基本科研业务费专项资助项目(2019EEEVL0202);河北省自然科学基金项目(E2017201221);河北大学研究生创新资助项目(HBU2021ss030)。

摘　　要：结构参数的不确定性会对PC框架节点的受力性能产生一定的影响,鉴于此,文中基于PC框架节点试验模型,利用OpenSEES平台建立其有限元模型,验证了其有限元模型的准确性;在此基础上,选取结构自身12个参数作为随机变量并采用拉丁超立方抽样(LHS)方法生成随机样本,研究了梁端反对称静力加载模式下结构响应的概率特征、轴压比对随机受力性能的影响以及结构参数的灵敏度大小。结果表明:结构参数的不确定性会造成结构受力响应的不确定性,结构响应的离散性可用对数正态描述;轴压比的增大会导致结构抵抗外荷载的能力降低,并且过高的轴压比会加大结构响应的离散性;对峰值剪力和屈服剪力灵敏度较大的参数为混凝土抗压强度和梁长,对峰值位移和屈服位移灵敏度较大的参数为纵筋屈服强度和混凝土抗压强度。The structural parameter uncertainty will have some influence on the force performance of PC frame joints.In this paper,based on the PC frame node test model,its finite element model was established using the OpenSees platform,and the accuracy of its finite element model was verified.On this basis,12 parameters of the structure itself were selected as random variables and the Latin hypercube sampling(LHS)method was used to generate random samples to investigate the probabilistic characteristics of the structural response under antisymmetric static loading mode at the beam ends,the effect of axial compression ratio on the random force performance and the sensitivity magnitude of the structural parameters.The results show:Uncertainty of the structural parameters leads to uncertainty of the structural response,and the dispersion of the structural response can be described by lognormal.An increase in the axial pressure ratio leads to a reduction in the ability of the structure to resist external loads,and an excessively high axial pressure ratio increases the dispersion of the structural response.The parameters with greater sensitivity to peak shear and yield shear are concrete compressive strength and beam length,and the parameters with greater sensitivity to peak displacement and yield displacement are longitudinal bar yield strength and concrete compressive strength.

关 键 词：PC框架节点 结构参数不确定性 静力加载模式 轴压比 灵敏度 

分 类 号：TU375.4[建筑科学—结构工程]