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为适应不超过6层的混凝土网格剪力墙住宅建筑的要求,研发了网格尺寸为400mm×400mm的大网格剪力墙承重体系。通过2个剪跨比为2.02和2个剪跨比为1.13的大网格剪力墙试件的拟静力试验,研究大网格剪力墙的破坏形态、滞回特性、变形能力和承载能力等。试验结果表明:试件横肢两端竖向裂缝贯通肢高;竖肢水平开裂,端竖肢底部混凝土局部压碎;水平力-位移滞回曲线有捏拢;极限位移角不小于1/60。弹性有限元分析表明,120mm厚的大网格墙可等效为60mm厚的普通剪力墙,其在轴压力作用下的受弯承载力可按60mm厚的剪力墙计算,但应乘以折减系数0.9。工程算例结果表明,大网格剪力墙承重体系可用于抗震设防烈度8度、6层及以下的住宅建筑。
In order to meet the requirements of residential buildings with no more than 6 stories of concrete grid shear walls, a large grid shear wall bearing system with a grid size of 400mm × 400mm has been developed. Through two quasi-static tests of two large-span shear wall specimens with a shear-span ratio of 2.02 and two shear-span ratios of 1.13, the failure modes, hysteresis characteristics, deformation capacity and bearing capacity Ability and so on. The test results show that the vertical cracks at the two ends of the specimen cross the limbs; the vertical limbs are horizontally cracked and the concrete at the bottom of the vertical limbs is crushed locally; the horizontal force-displacement hysteresis curves are pinched; the limit displacement angle is not less than 1/60 . The elastic finite element analysis shows that the 120mm-thick large-scale grid wall can be equivalent to 60mm-thick ordinary shear wall. The flexural capacity under axial compression can be calculated by 60mm thick shear wall, but should be multiplied by Reduction factor of 0.9. The engineering example shows that the load-bearing system with large grid shear wall can be used in residential buildings with seismic intensity of 8 degrees, 6 floors and below.