斜向加载钢筋混凝土核心筒抗震性能的试验研究

EXPERIMENT STUDY ON SEISMIC BEHAVIOR OF REINFORCED CONCRETE CORE WALLS UNDER DIAGONAL LOW CYCLE LOADING

为了研究混凝土核心筒在不同地震作用方向的破坏机理和抗震性能,进行了一个沿主轴45°方向和一个沿主轴0°方向加载的混凝土核心筒的水平低周反复荷载试验。研究了在不同加载方向下钢筋混凝土核心筒的破坏模式、层间滞回性能、耗能能力、墙肢截面应变、承载力、变形及延性性能、薄弱部位、强度衰减等。结果表明,加载角度对核心筒的破坏模式和抗震性能产生较大影响,增大加载角度,试件的损伤由两片腹板墙体逐渐向所有墙体发展,混凝土核心筒的空间性能发挥的较充分,受力模式发生改变,水平承载力和基底弯矩有一定程度的提高,最大层间位移角变化不大,但其层间延性系数有所降低。

To investigate the damage mechanism and seismic behavior of reinforced concrete core walls subjected to earthquake actions from different directions, a low cycle loading test with different loading directions of two reinforced concrete core walls specimens are carried out. The failure mode, interlaminar hysteretic behavior, energy dissipation capacity, wall section strain, bearing capacity, deformation performance, ductility and intensity attenuation of core walls are investigated. The test results indicate that the loading direction has an effect on the seismic performance, and also determines the failure mode of core walls; when the loading action direction increases from 0° to 45°, the damage of a core walls specimen is more fully, four shear walls are damaged. The spatial effect of shear walls is obvious; the force mode changes; the horizontal bearing capacity and base moment of RC core walls increase but displacement ductility reduce; and the maximum inter-story displacement of the specimens change little.