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DYNAMIC CHARACTERISTICS OF REINFORCED CONCRETE MEMBERS UNDER COMBINED STRESS CONDITION SUBJECTED TO CYCLIC AXIAL FORCE, TWO-AXIS BENDING, AND TORSION

循环轴力、两轴弯扭复合应力条件下钢筋混凝土构件的动力特性

基本信息

批准号：
17360215
负责人：
OTSUKA Hisanori
金额：
$ 10.96万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

During 2002 to 2004, the experimental research to clarify the hysteresis of reinforced concrete members subjected to axial forces, bending and torsional moments was conducted. Experimental parameters are constant axial forces, pitch of hoop lateral ties, and ratios of bending load to torsional load.During 2005 to 2007, the experimental research was continued for concrete members subjected to two-axis bending moment, cyclic axial loading, and pure torsion. Furthermore finite element analysis is applied for theses experimental works. The followings are main results.1) The effect of two-axis bending becomes remarkable for cases in which the bending are superior than torsion, therefore it would be not adequate if we use the bending -torsion interaction curve made by one- axis loading test data for the two- axis loading case.2) The effect of cyclic axial loading clearly appear in the shape of hysteresis loop and skeleton curve. For the case in which bending and axial force increase simultaneously, the shape of hysteresis become sharp and maximum strength become large.3) According to the increasing of damage torsional rigidity and damping ratios changed. These values are formulated using results of 30 test specimen to use the equivalent linear analysis.4) Nonlinear finite element analysis is successfully used for the simulation of load and deflection curves.5) The skeleton for the case of the cyclic pure torsion proposed in previous research is not sufficient and accurate. So new skeleton is proposed using the test results obtained by our experiments.

2002年至2004年期间，进行了钢筋混凝土轴力、弯矩和扭矩构件滞回性能的试验研究。试验参数为恒定轴力、箍筋间距和弯扭比。2005 ~ 2007年，继续进行了混凝土双向弯矩、轴向循环荷载和纯扭构件的试验研究。此外，有限元分析应用于这些实验工作。主要结果如下：（1）当弯曲比扭转强上级时，双轴弯曲效应显著，因此，对于双轴加载情况，采用单轴加载试验数据制作的弯扭相关曲线是不够的;（2）轴向循环加载效应以滞回曲线和骨架曲线的形式明显显现。当弯曲力和轴力同时增大时，滞回曲线形状变尖，最大强度变大。3）随着损伤程度的增加，扭转刚度和阻尼比也发生变化。这些值是利用30个试验样本的结果来制定的，以使用等效线性分析。4）非线性有限元分析成功地用于模拟载荷和挠度曲线。5）以前的研究中提出的循环纯扭转情况下的骨架是不充分和准确的。因此，利用我们实验获得的测试结果提出了新的骨架。