【摘要】 为了研究加载方法对钢筋混凝土柱低周反复荷载试验结果的影响,在分析半柱试验中柱端约束对试验结果影响的基础上,设计并制作了一个全柱试件和两个半柱试件,进行了低周反复荷载试验。一个半柱试件采用传统方法加载,竖向荷载通过球铰施加于柱顶;另一个半柱试件通过特制的销铰加载装置使竖向荷载和水平荷载的作用点交汇于销铰转动轴。通过比较全柱试件和半柱试件的滞回曲线、骨架曲线、极限荷载和变形值、累计耗能量发现,当采用销铰加载时,其试验结果与整柱基本相符;而采用传统加载方法时,由于柱端约束的存在,其承载能力明显偏大。因此,建议在半柱试件的低周反复荷载试验中采用销铰施加荷载以便合理模拟全柱柱中的反弯点。更多还原

【Abstract】 To investigate effects of loading methods on results of low cycle cyclic loading test for reinforced concrete columns,the current loading methods used in low cycle cyclic loading tests were compared and the influence of end constraint on test results of half-column specimens was analyzed.Low cycle cyclic loading tests were conducted on a full-column specimen and two half-column specimens with the same dimensions and reinforcement.One of the half columns was loaded by the traditional method in which the vertical load was applied on the top of the column through a sphere hinge,and the other was loaded with a well-designed pin-hinge device.By comparing hysteretic loops,envelope curves,ultimate load and displacement,and accumulated dissipated energy of the half columns with those of the full column,it was found that the test results of the half-column specimen loaded with a pin-hinge device agree well with those of the full column,while the tested ultimate load of the other half column is 33% larger than that of the full-column specimen due to the constraint at the top of the column.The pin-hinge loading device is therefore suggested to be used in low cycle cyclic loading test for half-column specimens.更多还原