再生混凝土框架结构恢复力特征参数的应变率效应分析  

Strain rate effect analysis on characteristic parameters of restoring force for recycled aggregate concrete frame structures

作　　者：王长青[1,2] 肖建庄[2] 李春祥[1] Wang Changqing;Xiao Jianzhuang;Li Chunxiang(Shanghai University,Shanghai 200444,China;Tongji University,Shanghai 200092,China)

机构地区：[1]上海大学,上海200444 [2]同济大学,上海200092

出　　处：《土木工程学报》2021年第8期24-36,共13页China Civil Engineering Journal

基　　金：中国博士后科学基金(2014M550247,2015T80449);国家自然科学基金(51608383)。

摘　　要：文章在前期研究工作基础上,采用提出的再生混凝土动态本构关系数学模型和非线性有限元数值模拟方法,深入分析了结构恢复力行为受应变率和再生粗骨料取代率影响的变化规律,提出了综合考虑应变率和再生粗骨料取代率的恢复力特征参数计算模型。通过对特征参数定量对比和分析,分别给出了不同再生粗骨料取代率下屈服荷载和变形的应变率影响因子计算公式。通过对再生混凝土结构延性受应变率和再生粗骨料取代率影响的变化规律量化分析,给出了位移延性系数的应变率影响因子计算公式。通过对所建议模型预测分析,并与试验结果进行校核,验证了计算模型的合理性。文章的研究工作为再生混凝土率敏感性等基础性问题研究提供理论依据,同时以期为再生混凝土的推广、工程应用以及抗震优化设计提供技术支撑。Based on the previous research work,the proposed dynamic constitutive model of recycled aggregate concrete(RAC)and the nonlinear finite element method are used to deeply analyze the change law of the structural restoring force behavior affected by the strain rate and replacement ratio(R)of recycled coarse aggregate(RCA),and the calculation models of characteristic parameters of the restoring force,which consider strain rate and replacement ratio of RCA comprehensively,are proposed.Through the quantitative comparison and analysis of characteristic parameters,the calculation formulas for strain rate influence factors of yield load and deformation under different replacement ratios of RCA are given.Based on the quantitative analysis of the influences of strain rate and replacement ratio of RCA on the ductility of RAC structure,the calculation formula of strain rate influence factor of displacement ductility coefficient is given.The rationality of the calculation model is verified by the prediction analysis of the model and the test results.This research work provides a theoretical basis for the study of the basic problems such as the rate sensitivity of recycled aggregate concrete(RAC),and provides technical support for the promotion,engineering application,and seismic optimal design of RAC.

关 键 词：再生混凝土 恢复力 特征参数 率敏感性 结构行为 

分 类 号：TU375.4[建筑科学—结构工程]