摘要
Abstract
Three frame joints strengthened by self-compacting concrete and one unstrengthened joint were produced for comparison. Static tests using MTS servo loading system on the frame joints under secondary load were carried out to study the influence of different initial forces on the seismic performance. The initial column axial load ratio was 0.3, and the initial forces of the beam were 0, 0.25 and 0.50 times the estimated cracking load of the unstrengthened specimen beam end. The results of the damage process, strain of the old steel and new steel, the load-displacement hysteretic loops were analyzed. It is found that the interactive performance of the old concrete and new concrete is good when using self-compacting concrete to strengthen the frame joints. Considering the impact of the initial load of the beam end, the ultimate strength, displacement, and beam end displacement ductility coefficient of the reinforced joints etc. are reduced. The degree of reduction increases with the initial load, which should be considered in the design of strengthening.关键词
框架节点/自密实混凝土/加固/二次受力/拟静力试验/抗震性能Key words
frame joint/self-compacting concrete/strengthening/secondary load/quasi-static test/seismicperformance分类
建筑与水利
