高轴压比足尺钢筋混凝土短柱抗震性能研究

Seismic behavior of full-scale reinforced concrete short columns with high axial compression ratio

利用40000kN的大型加载设备,对2个截面边长为500mm×500mm的高轴压比钢筋混凝土足尺短柱进行了水平荷载作用下的单调和反复加载试验,研究其破坏形态、滞回特性、变形和耗能能力等抗震性能。结果表明:对于反复加载和单调加载的短柱,分别在6Δy和9Δy之前以弯曲变形为主,而在其之后则以剪切变形为主,最终分别在8Δy和18Δy时发生了脆性剪切破坏;极限位移时,弯曲变形引起的柱端位移约占总位移的75%;峰值荷载时,P-Δ效应引起的弯矩占总弯矩的3.24%,对短柱的水平承载力影响较小,进行构件的弹性分析时可不予考虑;构件具有较强的耗能能力和变形能力,具有良好的抗震性能。

Utilizing 40000kN large scale loading system, two 500mm × 500mm reinforced concrete short columnswith high axial compression ratio were tested under monotonic horizontal loading and low cycle reversed loading.Their seismic behavior including the failure patterns, hysteretic behavior, deformation and energy dissipation capac-ity etc. The results show that the short columns have a stable bending deformation pattern before the displacementreaches 6△y under cyclic loading and 9At under monotonic loading. The displacements arriving at the brittle shearfailure under two kinds of loading are 8△y and 18△y respectively. Under extreme displacement the displacement atthe end of the column caused by the bending deformation accounts for about 75% of the total displacement. Underpeak load the bending moment caused by P-A effect which has almost no influence on the shear of the short columnmay not be taken into account when the elastic analysis24% of the total bending moment. The component hascapacity which lead to a good seismic performance.was carried out on the component as it is accounted for 3.the strong ability of energy dissipation and the deformation