摘要
提出了一种新型的后张无粘结混合装配式预应力混凝土框架(PTHP)节点,为了研究该节点的抗震性能,对3榀PTHP边节点进行了低周往复荷载试验.对构件的破坏形态、滞回曲线、骨架曲线、耗能能力、延性、刚度退化以及残余变形等抗震性能进行了分析.结果表明:除节点区梁端以外,梁上大部分区域均未出现裂缝,柱和牛腿几乎无损伤,节点的破坏呈典型的强柱弱梁特征;截面平均初始压应力越大,带肋角钢初始刚度越大,则节点的承载力越高,但相应的极限位移越小;无粘结的后张预应力筋在加载过程中始终保持弹性,为节点提供了良好的自恢复能力.PTHP节点具有较好的承载力、刚度和耗能能力,与现浇结构相比其变形能力、自恢复能力更好,残余变形更小.
A newtype of unboned post-tensioned hybrid precast concrete frame joint（ simplified as PTHP） was proposed. To study the seismic behaviors of the PTHP joints,the lowcyclic loading tests of the joints were carried out. The failure pattern,hysteresis curves,skeleton curves,energy dissipation capacity,ductile capacity,stiffness degradation curves and residual deformations of the PTHP joints were analyzed. Experimental results showthat except the beam end in the connection area,cracks have not been seen on most area of the beam,and there is almost no damage on column and bracket. The destruction of the connection is a typical characteristic of strong column weak beam. The bearing capacity of the joint is higher if the average initial compressive stress on cross section and the initial stiffness of ribbed angle increase,meanwhile the corresponding limit displacement is smaller. The unboned post-tensioned prestressing tendons keep elastic during the loading process,providing excellent self-centering ability. The joints have good bearing capacity,stiffness and energy dissipation capacity,and better deformation and self-centering ability,less residual deformation compared with the cast-in-place structure.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第5期1063-1069,共7页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51508220)
江苏省青年自然科学基金资助项目(BK20130408)
关键词
后张
无粘结
混合装配
框架节点
抗震性能
post-tensioned
unboned
hybrid precast
frame joints
seismic bearing capacity
