钢筋混凝土空心剪力墙刚度退化研究

基于不同剪跨比的6个钢筋混凝土空心剪力墙试件在低周反复水平荷载作用下的试验结果,研究试件从开始加荷到破坏过程中刚度退化的规律.通过对试验所得各试件滞回曲线及骨架曲线的分析,得出刚度退化系数随试件顶点位移变化的规律,并与有关文献中普通钢筋混凝土剪力墙刚度退化规律进行比较.研究结果表明:钢筋混凝土空心剪力墙在开裂之前,基本处于弹性工作阶段,在开裂之后刚度退化速度较普通钢筋混凝土剪力墙快.当剪跨比大于1小于2时,钢筋混凝土空心剪力墙刚度退化速度较普通钢筋混凝土剪力墙快大约25%;当剪跨比小于1时,前者较后者快大约25%-35%;当层间位移角达1/200时,二者的刚度退化速度接近.

Study of stiffness degeneration on R.C. hollow shear wall

Based on the test of 6 R.C hollow shear wall samples with different shear span ratio under low cycle and reverse horizontal load,the samples stiffness degeneration law is studied.Through analyzing the load-displacement curves and skeleton curves the changing law of stiffness degeneration coeffcient with sample top displacement can be obtained compared to the stiffness degeneration law of common R.C shear wall.Study results indicate that before the R.C hollow shear walls crack,they work in elasticity stage.After cracking R.C hollow shear wall stiffness degeneration speed is quicker than common R.C shear wall.When shear span ratio is bigger than 1 and smaller than 2,R.C hollow shear wall stiffness degeneration speed is about 25% quicker than common R.C shear wall.When shear span ratio is smaller than 1,the former is about 25%-35% quicker than the latter.When storey displacement angle reaches 1/200,the stiffness degeneration speed is close to each other.