型钢高强高性能混凝土框架拟动力试验研究

采用基于位移控制的多点地震记录输入的拟动力试验方法,进行了一榀1/4比例的两跨3层型钢高强高性能混凝土框架拟动力试验。研究了地震作用下该结构的动力反应、层间位移和楼层耗能的分布方式、结构破坏机理及裂缝形态,测试了结构在不同阶段的频率与阻尼比。试验结果显示型钢高强高性能混凝土框架具有良好的耗能能力和变形能力,框架实现了较为理想的梁铰屈服机制,楼层变形呈倒三角形分布,结构阻尼比略低于普通型钢混凝土框架结构的阻尼比。最后,基于考虑损伤退化的型钢高强高性能混凝土框架滞回模型对试验模型进行了弹塑性时程分析,并分析了计算与试验结果产生差异的原因。

Pseudo-dynamic test on steel reinforced high strength and high performance concrete frame

A 1/4 scaled model of two-bay and three-storey steel reinforced high strength and high performance concrete frame was tested based on displacement controlled pseudo-dynamic test technique,which the earthquake record were input on multi-points at the same time.Based on the experiment result,the structural dynamic response,distribution of storey displacement and the energy dissipation,as well as the failure mechanism and crack patterns under the earthquake were studied.The variation of the structural frequency and damping ratio under different stages were tested.The results show that the steel reinforced high strength and high performance concrete frame has excellent energy dissipation capacity and deformation capacity.The plastic hinges are initially formed in beam ends and the storey displacement linearly distributes along the height of the structure.The damping ratio is lower than that of the normal strength concrete.The analysis model for the elastic-plastic earthquake response of the structure is put forward,and the calculated results agree well with the test results.