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四肢变截面平缀管式钢管混凝土格构柱恢复力模型研究 被引量:2

Research on calculation method of restoring force model of four-element variable cross-sectional concrete filled steel tubular laced columns with flat lacing tube
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摘要 采用OpenSEES有限元程序,进行四肢变截面平缀管式钢管混凝土格构柱抗震性能的参数分析.在此基础上,借鉴钢管混凝土单肢柱和等截面钢管混凝土格构柱骨架曲线的计算框架,对四肢变截面平缀管式钢管混凝土格构柱骨架曲线的主要特征值(弹性刚度、水平峰值荷载、峰值荷载位移、下降段刚度)及恢复力模型的计算进行深入探讨,并提出相应计算公式.选取干海子特大桥变截面格构墩对算法进行工程实例验证,骨架曲线和P-△滞回曲线的计算结果均与有限元数值吻合良好.最后提出适用于工程实际的四肢变截面平缀管式钢管混凝土格构柱恢复力模型的实用算法. Four-element variable cross-sectional concrete filled steel tubular(CFST) laced column with flat lacing tube is a kind of emerging combination column, it has broad application prospects in high pier bridges and high-rise buildings. The finite element analysis method of four-element variable cross-sectional CFST laced columns is built with universal program of OpenSEES; and the influence of parameters on seismic performance of laced columns is researched. On the base of research results, the calculation method of skeleton curve whose main factors include elastic stiffness, horizontal peak load and its displacement, fall- period stiffness and restoring force model of four-element variable cross-sectional CFST laced columns are studied referring to the calculation frame of CFST single tube column and equal sectional CFST laced col- umn; and the corresponding formula is proposed. Then engineering examples verifications of Ganhaizi bridge's laced column pier are processed with OpenSEES program. Research results show that the calculated values of skeleton curve and P-A hysteresis loop by the new calculation method are coincident well with numerical results. Finally, a method for calculating restoring force model of four-element variable cross-sectional CFST laced columns is provided, which is adapted to engineering application.
作者 欧智菁 陈盛富 林建茂 OU Zhijing;CHEN Shenfu;LIN Jianmao(Fujian University of Technology,Fuzhou 350118,China)
机构地区 福建工程学院
出处 《武汉大学学报(工学版)》 CAS CSCD 北大核心 2018年第11期992-997,共6页 Engineering Journal of Wuhan University
基金 国家自然科学基金项目(编号:51408128) 福建省高校新世纪优秀人才支持计划项目(编号:GY-Z15108) 福建省自然科学基金项目(编号:2017J01471)
关键词 变截面 平缀管 钢管混凝土 格构柱 骨架曲线 恢复力模型 variable cross-section concrete filled steel tube column flat lacing tube skeleton curve restoring force model
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