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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。
In order to study the failure mechanism and seismic performance of concrete core tube in different seismic directions, a horizontal low cycle repeated load test was carried out along the main axis at 45 ° and a concrete core tube loaded at 0 ° along the main axis. The failure mode, interlayer hysteretic behavior, energy dissipation capacity, section strain, bearing capacity, deformation and ductility, weakness and strength attenuation of reinforced concrete core tube under different loading directions are studied. The results show that the loading angle has a great influence on the failure mode and the seismic performance of the core tube, and the loading angle is increased. The damage of the specimen is gradually developed from two web walls to all the walls, and the space performance of the concrete core tube More fully, the stress mode changed, the horizontal bearing capacity and the bending moments of the basement increased to a certain extent, and the displacement angle of the maximum layer did not change much, but the ductility coefficient of the interlayer decreased.