型钢高强高性能混凝土框架节点抗震性能试验研究

为了研究型钢高强高性能混凝土框架节点的抗震性能,进行了5榀缩尺比例为1/4的框架中节点的低周反复加载试验,对不同混凝土强度等级、不同轴压比下梁柱节点的受力特点、应变分布、裂缝开展模式、破坏形态、变形特征、延性性能进行了研究。结果表明,型钢高强高性能混凝土框架节点的破坏过程与普通型钢混凝土框架节点相似,相同条件下节点的延性性能和耗能能力较普通型钢混凝土节点的略差,但型钢对高强高性能混凝土的有力约束改善了其本身延性差带来的不利于抗震的脆性特征,设计合理的型钢高强高性能混凝土框架节点具有良好的位移延性和滞回特性。

Experimental research on seismic behavior of steel reinforced high strength and high performance concrete frame joints

To understand mechanical characteristics and seismic behaviors of steel reinforced high strength and high performance(SRHSHPC) frame joints,cyclic loading tests were carried out on five 1/4-scale interior joints.The study was focused on joints′ mechanical character,stress distribution,crack development,failure mode and ductility under different concrete strength grade and different axial load.The result indicates that failure process of SRHSHPC frame joints is similar to that of ordinary steel reinforced concrete frame joints,but the ductility and energy dissipation ability of the former is slightly inferior to those of the latter.Effective constraint of steel to the concrete improves brittleness character caused by concrete′s bad ductility.Well designed SRHSHPC frame joint accesses good displacement ductility and hysteretic behavior.