基于延性破坏准则的再生混凝土柱抗震性能研究  

Research on seismic behaviors of recycled concrete columns based on ductility failure criterion

作　　者：成勇龙 付国[1] 张爱军[1] 张博[1] CHENG Yonglong;FU Guo;ZHANG Aijun;ZHANG Bo(College of Water Resource and Architectural Engineering,Northwest A&F University,Yangling 712100,China)

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《世界地震工程》2023年第4期95-106,共12页World Earthquake Engineering

基　　金：国家自然科学基金资助项目(51978572);陕西省自然科学基础研究计划项目(2017JQ5113)。

摘　　要：为揭示再生混凝土柱的性能退化机理,根据拟静力试验现象和试验数据,对再生混凝土柱的破坏进行了量化研究。首先进行了Park-Ang破坏准则和延性破坏准则的计算验证,统计分析结果表明延性破坏准则可用于再生混凝土柱破坏计算研究。基于延性破坏准则对再生骨料取代率与混凝土强度、破坏指数的量化关系进行了研究,建立了混凝土强度退化与破坏指数的函数关系;从再生骨料界面结合能力、粘结性能和强度变化三个方面对再生混凝土柱性能退化规律进行了解释说明,考虑再生骨料取代率和混凝土强度的影响,提出了改进的再生混凝土柱延性破坏准则。研究结果表明:考虑混凝土强度影响的改进延性破坏准则计算结果更接近于1.0,且离散性较低,更准确的定义了再生混凝土柱的破坏。综合再生混凝土柱试验现象、破坏规律及破坏指数计算结果,给出了再生混凝土柱的延性准则破坏评价标准,相关研究成果可用于再生混凝土柱的破坏评估和震损鉴定。In order to reveal the degradation mechanism of reclaimed concrete column,the failure of reclaimed concrete column was quantitatively studied according to the pseudo-static test phenomenon and test data.Firstly,the calculation and verification of the Park-Ang failure criterion and the ductile failure criterion are carried out.The statistical analysis results show that the ductile failure criterion can be used to calculate the failure of recycled concrete columns.Based on the ductile failure criterion,the quantitative relationship between the replacement rate of recycled aggregate and the strength and failure index of concrete is studied,and the functional relationship between the strength and failure index of concrete is established.The law of performance degradation of recycled concrete column is explained from three aspects of interface bonding ability,bonding property and strength change of recycled aggregate.Considering the influence of the replacement rate of recycled aggregate and the strength of concrete,an improved ductile failure criterion of recycled concrete column is put forward.The results show that the calculation result of the improved ductile failure criterion considering the influence of concrete strength is closer to 1,and the dispersion is lower,which more accurately defines the failure of the recycled concrete column.Based on the experimental phenomenon,failure law and failure index calculation results of recycled concrete columns,the failure evaluation criterion of ductility criterion of recycled concrete columns is given.The relevant research results can be used for failure evaluation and earthquake damage identification of recycled concrete columns.

关 键 词：再生混凝土柱 抗震性能 破坏准则 再生骨料取代率 破坏标准 

分 类 号：TU375.3[建筑科学—结构工程]