直接拉伸循环荷载作用下混凝土滞回特性实验研究及定量分析  

Experiments study and quantitative analysis on hysteresis behavior of plain concrete under uniaxial cyclic tensile loading

作　　者：刘志恒 陈徐东[1] 陈超 LIU Zhiheng;CHEN Xudong;CHEN Chao(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;Zhangjiagang Water Conservancy Bureau,Water Management Service Station of Jingang Center,Zhangjiagang 215600,China)

机构地区：[1]河海大学土木与交通学院,南京210098 [2]张家港市水务局张家港市金港中心水利管理服务站,张家港215600

出　　处：《振动与冲击》2020年第7期209-215,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51779085);青年人才托举工程(2017QNRC001)。

摘　　要：由于直接拉伸试验较为困难,可靠的数据十分少有。采用液压闭环伺服材料试验机MTS322试验装置(MTS)对混凝土进行了高应力轴拉往复试验,试验采用正弦波进行加载。对混凝土应力和应变的相位差引起的滞回现象进行研究。加载时应变波和应力波的相位差与卸载时不同,加载与卸载的相位差导致了一个不对称的滞后回路。随着加载频率的增加,混凝土的耗散角减小,约为其切线模量的“X”形夹角的一半。As the direct tensile test is difficult,reliable data are very rare.In this paper,the high stress axial tension reciprocating test of concrete was carried out by using hydraulic closed-loop servo material testing machine MTS322,and sine wave was loaded in the test.The hysteretic phenomenon caused by the phase difference between stress and strain of concrete was studied.The phase difference between strain wave and stress wave during loading is different from that during unloading,and the phase difference between loading and unloading leads to an asymmetric hysteresis loop.With the increase of loading frequency,the dissipation angle of concrete decreases,which is about half of the“X”angle of its tangent modulus.

关 键 词：素混凝土 轴拉往复试验 滞回特性 相位差 耗散角 

分 类 号：TU528.1[建筑科学—建筑技术科学]