变轴压比预制高强混凝土混合配筋管柱抗震性能研究

Seismic Behavior of Prefabricated High Strength Concrete Pipe Column with Mixed Reinforcement Under Various Axial-Compression Ratio

通过对3根预制高强混凝土混合配筋管柱试件在不同轴压比下的拟静力试验,研究了轴压比对其抗震性能的影响.其中管柱试件中预应力钢棒和HRB400级钢筋各配置6根,两者间隔布置.详细记录试件的破坏过程,得到试件的滞回曲线、骨架曲线、承载力、变形能力、承载力退化曲线和耗能能力等.试验结果表明:各试件均为受弯破坏,延性系数为2.50~2.93,极限位移角为1/33~1/27;配置预应力筋的混合配筋管柱试件残余位移较小,自复位能力较强;轴压比是影响试件延性和耗能能力的重要因素,随着轴压比增大,试件延性降低,耗能能力减弱.

Quasi-static tests were conducted on three specimens to study the influence of axial-compression ratio on the seismic behavior of prefabricated pipe columns with high-strength concrete,which were reinforced with six prestressed steel bars and six 400,MPa grade steel bars.The failure process of specimens was recorded in detail,and several indexes such as the hysteretic curve,skeleton curve,bearing capacity,deformation capacity,stiffness degradation and energy dissipation capacity of specimens were obtained.The test results indicated that all the specimens fail in flexural mode.The ductility coefficient of the specimens is 2.50-2.93,and the ultimate drift ratio is 1/33-1/27.Pipe columns with mixed reinforcement have smaller residual displacement and better performance of automatic resilience.Axial-compression ratio is an important factor affecting the ductility and energy dissipation capacity of pipe columns.The ductility is reduced and the energy dissipation capacity is decreased with the increase of axialcompression ratio.