性能增强再生混凝土框架中节点地震损伤评估  

Seismic damage evaluation on interior joints of frame constructed of enhanced recycled aggregate concrete

作　　者：樊禹江[1,3] 余滨杉 熊二刚[3] 苗晓瑜[3] FAN Yujiang;YU Binshan;XIONG Ergang;MIAO Xiaoyu(Chang’an University School of Architecture,Xi’an 710061,China;Northwestern Polytechnical University School of Mechanics,Civil Engineering and Architecture,Xi’an 710072,China;Chang’an University School of Civil Engineering,Xi’an 710061,China)

机构地区：[1]长安大学建筑学院,陕西西安710061 [2]西北工业大学力学与土木建筑学院,陕西西安710072 [3]长安大学建筑工程学院,陕西西安710061

出　　处：《世界地震工程》2019年第2期123-131,共9页World Earthquake Engineering

基　　金：陕西省自然科学青年基金基金(2017JQ5061);国家自然科学基金(51808046)

摘　　要：通过对3个足尺性能增强再生混凝土框架中节点进行低周反复加载试验,按照传统延性损伤模型(单参数)、改进的Park-Ang损伤模型(双参数)对其损伤演化与累积进行分析:各试件特征位移等于20 mm时,试件已经出现损伤,但按照延性损伤模型计算结果为负;当特征位移超过100 mm时,改进的Park-Ang损伤模型计算结果表明各试件已经完全破坏,无法继续承载,但试件实际结果却仍表现出一定的承载能力与耗能能力。因而有必要对前述损伤模型进行修正,使其能够适用于性能增强再生混凝土结构之中。基于前述试验结果,针对改进的Park-Ang损伤模型,提出并拟合了纤维项系数、位移项系数和能量项系数3种修正系数,并建立了相应的修正的Park-Ang损伤模型。最后,利用所提出的损伤模型,以HF-RAC2为例进行了损伤指标误差分析,结果表明:平均误差在6%以内,即:所提出双参数损伤模型能够应用于性能增强再生混凝土框架节点地震损伤与评估分析之中。Three full-scale interior joints of the enhanced recycled aggregate concrete(EC-RAC)frame were tested with low-cyclic loading.Its damage evolution and accumulation were analyzed by traditional Ductile Damage Model(single parameter)and Improved Park-Ang Damage Model(double parameters):When the characteristic displacement of each specimen reached 20 mm,damage occurred in the specimen,but the calculated results according to the Ductile Damage Model was negative.When the characteristic displacement exceeded 100 mm,the calculated results based on the Improved Park-Ang Damage Model shown that:each specimen had been completely destroyed with no load-carrying capacity.However,it is shown from the test results that they still had a certain load-carrying and energy-consuming capacity.Therefore,it is necessary to revise the aforementioned damage models for the enhanced recycled aggregate concrete structure.Based on the above experimental results,the fiber term coefficient,displacement term coefficientand energy term coefficient were proposed for the Improved Park-Ang Damage Model.Then,a modified Park-Ang Damage Model was established.Taking specimen HF-RAC2 as an example,the error of the damage index for the model was analyzed.The results show that the average error was within 6%,which means the damage model can be applied to the EC-RAC frame joints for seismic damage evaluation.

关 键 词：性能增强再生混凝土 延性损伤模型 Park-Ang损伤模型 损伤评估 

分 类 号：TU375[建筑科学—结构工程]