后张无黏结装配式框架节点抗震承载力预测  

Prediction of seismic bearing capacity of unbonded post-tensioned precast concrete frame joints

作　　者：张晨[1,2] 孟少平[1] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [2]南通大学建筑工程学院,南通226019

出　　处：《东南大学学报（自然科学版）》2014年第5期1005-1010,共6页Journal of Southeast University：Natural Science Edition

基　　金：交通运输部科技资助项目(2012319813260);江苏省高校自然科学基金资助项目(13KJB560011);江苏省青年科学基金资助项目(BK20130408)

摘　　要：为研究后张无黏结装配式框架梁柱节点的抗震性能,提出了一种节点骨架曲线上特征点的计算方法.首先,基于弹性梁的理论和刚体转动原理,详细分析了后张无黏结节点梁端位移的组成,并给出计算位移的通用公式.然后,根据梁端截面在不同临界点(开裂点、线性极限点、混凝土核心区压碎点)的受力特点,计算了各特征点对应的荷载.最后,根据后张无黏结角钢连接节点的转动特征以及角钢在反复拉压荷载下的恢复力模型,得到骨架曲线上特征点的简化计算公式.计算结果与低周往复荷载下节点试验结果吻合较好,由此证明了计算的合理性和正确性.结果表明,该计算方法基于合理的力学概念,可较为准确地预测节点骨架曲线,具有计算简便、适用性广的优点.In order to study the seismic bearing capacity of unbonded post-tensioned precast concrete frame beam-to-column joints,a calculation method for the skeleton curve of joints is proposed. First,based on the elastic beam deflection and rigid body rotation theory,the composition of displacement of the unbonded post-tensioned joints is analyzed and the common formulas are given. Then,according to the loading features of the section at the beam end at different critical points （crack points,linear critical points,crush points of the core concrete）,the corresponding loads are calculated.Finally,according to the rotation features and the hysteretic model of the angle of the unbonded post-tensioned steel angle joints,the simplified formulas for the characteristic points of the skeleton curve are deduced.The calculation results agree well with the experimental results under reversed cyclic loading,proving the rationality and correctness of the calculations.The results show that based on reasonable rational mechanics,this calculation method,which is simple and widely used,can predict the skeleton curve of joints accurately.

关 键 词：后张 无黏结 装配式 框架节点 抗震承载力 预测 

分 类 号：TU378.4[建筑科学—结构工程] TU352.11