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高强混凝土加芯柱恢复力特性研究

, PP. 90-96

Keywords: 桥梁工程,高强混凝土加芯柱,往复加载试验,恢复力特性,抗震

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Abstract:

?基于6根试验柱在既定轴力下的低周往复加载试验数据、滞回曲线及各阶段的柱顶水平荷载和位移,以峰值荷载点为基准,将试件的骨架曲线拟合为三线段,确定了试件屈服点、极限点与峰值点的关系,根据荷载达峰值时的柱顶水平位移及截面平衡条件推导出了峰值荷载的计算公式;对试验结果进行分析,得到了极限位移、峰值荷载对应位移与核心区纵筋配筋率、核心区面积比及配箍特征值的线性公式;结合试件的滞回规律构建了高强混凝土加芯柱的恢复力模型,并将计算滞回曲线与试验值进行了对比。结果表明:拟合的骨架曲线特征点的计算方法具有较高的精度,构建的恢复力模型与高强混凝土加芯柱的试验滞回曲线吻合较好。

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