预制高强混凝土结构后浇整体式梁柱组合件抗震性能试验研究

采用足尺模型对比试验方法,对高强混凝土后浇整体式梁柱组合件和高强钢纤维混凝土后浇整体式梁柱组合件在低周反复荷载作用下的开裂破坏形态、滞回特性、骨架曲线、延性性能、强度与刚度退化特性、耗能能力、节点核心区域的剪切变形、梁端塑性铰与柱端的转动变形等进行了系统研究。结果表明:预制高强混凝土结构后浇整体式梁柱组合件与现浇高强混凝土结构梁柱组合件具有相同的抗震能力,采用高强钢纤维混凝土浇筑预制混凝土结构后浇节点,可以减小节点区域箍筋用量,改善节点承载性能。本文还给出了钢纤维混凝土节点开裂强度的简化计算公式,计算结果与试验结果吻合良好。

Experimental study on seismic behavior of precast concrete beam-column subassemblage with cast-in-situ monolithic joint

By use of the comparable full scale model test method, the seismic behavior of precast concrete beam column subassemblages with high strength concrete and steel fiber reinforced high strength concrete cast in situ monolithic joints under low cycle reversed loading, such as the failure pattern, hysteretic characteristic, skeleton curve, ductility, strength and stiffness degradation, energy dissipation, shear deformation of the joint core zone, rotation of the beam end and column end, were studied in this paper. The results indicated that the precast reinforced concrete beam column subassemblage almost has the same seismic capacity as that of the cast in situ reinforced concrete beam column subassemblage, and the steel fiber reinforced concrete can reduce the amount of stirrups of the joint as well as improve the shear load resistance performance. A simplified cracking strength formula for steel fiber reinforced concrete joint has been presented, and the calculation results are in good agreement with the test results.