轴压重复荷载作用下L形柱箍筋约束混凝土加卸载准则  

LOADING AND UNLOADING CRITERION OF CONCRETE CONFINED BY STIRRUPS IN L-SHAPED RC COLUMNS UNDER AXIAL REPEATED LOADS

作　　者：王晓伟 魏士华 WANG Xiaowei;WEI Shihua(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China;Civil Engineering Technology Research Center of Hebei Province,Tianjin 300401,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]河北省土木工程技术研究中心,天津300401

出　　处：《工业建筑》2018年第8期61-67,共7页Industrial Construction

基　　金：河北省自然科学基金项目(E2014202178)

摘　　要：对5根箍筋约束混凝土L形柱进行了轴心重复受压试验,分析了轴压重复荷载作用下L形柱箍筋约束混凝土应力-应变曲线包络线,参照单调荷载作用下L形柱的箍筋约束混凝土应力-应变全曲线数学模型,建立了轴压重复荷载作用下L形柱箍筋约束混凝土应力-应变包络线方程,计算结果和试验结果吻合良好;并对轴压重复荷载作用下L形柱箍筋约束混凝土加卸载曲线特征进行分析,基于试验结果的回归分析,建立了加卸载准则,与试验结果比较,二者吻合良好,说明提出的加卸载准则能够较好地反映轴压重复荷载作用下L形柱约束混凝土的应力-应变变化规律。Tests of 5 L-shaped concrete columns confined by stirrups were carried out under axial repeated loads. The stress-strain envelope curves of L-shaped confined concrete columns were analyzed,and the envelope equation was proposed referring to the stress-strain curve model of confined concrete under monotonic load. The calculated reults agreed well with the experimental results. The loading and unloading curves characteristics of confined concrete of Lshaped columns were studied,and the loading and unloading criterion was established through the regression analysis based on test results. The calculated and experimental results were in good agreement. It was shown that the loading and unloading criterion proposed in the paper could well express the stress-strain curve of L-shaped confined concrete under axial repeated loads.

关 键 词：L形柱 轴压重复荷载 配箍特征值 约束混凝土 加卸载准则 

分 类 号：TU37[建筑科学—结构工程]