应变率对钢筋混凝土柱动态性能影响的研究  

Study of the influence of strain rate on the dynamic behavior of RC columns

作　　者：王德斌[1] 范国玺[2] 刘军[1,3] 丰茂东 

机构地区：[1]大连交通大学土木与安全工程学院,辽宁大连116028 [2]中国海洋大学工程学院,山东青岛266100 [3]大连理工大学,辽宁大连116024 [4]大连都市发展设计有限公司,辽宁大连116012

出　　处：《地震工程与工程振动》2016年第3期76-83,共8页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学青年基金项目(51408093;51308356;51308085);国家自然科学基金项目(51378085);辽宁省教育厅科学研究一般项目(L2015098)~~

摘　　要：为研究钢筋混凝土柱式构件的动态力学性能,采用位移控制加载模式,对7组钢筋混凝土柱式构件进行不同加载速率下的往复加载试验。基于试验结果,详细分析了钢筋混凝土柱在不同加载速率下的动态力学性能。试验结果表明:试件的捏缩效应水平受加载速率的影响不大;加载速率对屈服荷载的影响程度要高于对极限荷载的影响程度;随着加载速率的提高,试件的初始刚度显著增加,但刚度退化进程加剧;随着加载速率的提高,骨架曲线下降段的斜率增大,且破坏台阶缩短;加载速率的提高导致试件内部微裂缝数量的减少及破坏区域的更加局部化;双向加载过程中的耦合作用也会增强加载速率对破坏过程的影响;加载速率对试件力学性能的影响水平也会受到试件轴压比、配筋率的影响,而剪跨比的影响不大。In order to study the dynamic mechanical properties of reinforced concrete column members,cyclic loading test for 7 groups of reinforced concrete column members under different loading rates were carried out with the displacement-controlled loading modes. Based on test results,the dynamic mechanical properties of reinforced concrete columns under different loading rates were analyzed in detail. Test results show that the loading rate has little influence on the pinch effect level of the specimens. The influence degree of loading rate on the yield carrying capacity is higher than that on the ultimate carrying capacity. With the increase of the loading rate,the initial stiffness of the specimen increases obviously,but the stiffness degradation process is increased. With the increase of the loading rate,the slope of the descending branch of the skeleton curve increases,and the failure stage is shortened. The increase of loading rate leads to the decrease of the number of micro cracks in specimen and the localization of the damage region. The coupling effect of the bidirectional loading process can also increase the effect of the loading rate on the failure process. The influence of loading rate on the mechanical properties of the specimens is affected by the axial compression ratio and reinforcement ratio. However,the shear span ratio has little influence on the mechanical properties of the specimens.

关 键 词：钢筋混凝土柱 双向加载 加载速率 应变率 轴压比 剪跨比 

分 类 号：TU375[建筑科学—结构工程] TU528.571