预应力混凝土装配框架中节点抗震性能试验研究

发布时间：2018-02-22 21:31

本文关键词： 装配框架中节点预应力混凝土拟静力试验抗震性能　出处：《建筑结构学报》2015年S2期 　论文类型：期刊论文

【摘要】：对2个现浇混凝土中节点和2个预应力装配框架中节点进行了低周往复加载试验,以配筋率(分别为0.7%和1.0%)作为变量,在中节点试件的柱端上部施加低周反复水平荷载,对比分析了现浇节点与装配节点的滞回曲线、骨架曲线、延性系数、耗能能力、刚度曲线和剪切变形,研究了在不同连接方式下配筋率对节点抗震性能的影响。研究结果表明:预应力混凝土装配框架中节点发生的是梁端受弯破坏,卸载后的残余变形明显小于现浇试件,配筋率较小的试件的裂缝较集中在梁柱交界处,混凝土更容易脱落。配筋率较高的试件滞回曲线较饱满,承载力衰减的程度减缓。装配试件节点核心区的抗裂性能、刚度和变形恢复能力较好,延性系数在3.2~4.0之间,预应力筋有缓解裂缝过早出现,削弱剪切变形的作用。
[Abstract]:Two in-situ concrete joints and two joints in prestressed assembly frame were subjected to low-cycle reciprocating loading tests. The reinforcement ratio (0.7% and 1.0 respectively) was used as variables to apply low-cycle repeated horizontal load on the top of the column end of the mid-joint specimen. The hysteretic curve, skeleton curve, ductility coefficient, energy dissipation capacity, stiffness curve and shear deformation of cast-in-place and assembly joints are compared and analyzed. The effect of reinforcement ratio on the seismic behavior of joints under different connection modes is studied. The results show that the joints of prestressed concrete assembly frame are subjected to bending failure at the end of beam, and the residual deformation after unloading is obviously smaller than that of cast-in-place specimens. The cracks of the specimens with lower reinforcement ratio are concentrated at the junction of Liang Zhu, and the concrete is easier to fall off. The hysteretic curve of the specimen with higher reinforcement ratio is fuller, and the degree of bearing capacity attenuation is reduced. The stiffness and deformation recovery ability are better, the ductility coefficient is between 3.2 and 4.0, the prestressing tendons can alleviate the premature occurrence of cracks and weaken the shear deformation.
【作者单位】：华北理工大学建筑工程学院;河北省地震工程研究中心;唐山工业职业技术学院;
【基金】：国家自然科学基金项目(51208171) 河北省科技支撑计划项目(13273809)
【分类号】：TU378.4;TU352.11

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