不同剪跨比钢筋混凝土剪力墙拟静力试验研究

为了研究钢筋混凝土剪力墙在低周期反复荷载作用下受力性能,通过3片剪力墙的拟静力试验,比较不同剪跨比的剪力墙的破坏形态、破坏程度,以及对试验现象进行分析,得到了荷载与位移关系的滞回曲线。对于剪切破坏的剪力墙延性差,耗能能力差,刚度和承载力下降突然,在工程设计中应尽量避免。对于弯曲破坏的剪力墙则延性较好,滞回曲线丰满,耗能能力强,刚度和承载力缓慢下降,在工程设计中应采用。在对钢筋混凝土剪力墙恢复力曲线模型进行选取时,若剪跨比较小,建议采用坡顶刚度退化二线型模型或坡顶三线型模型。若剪跨比较大,则建议采用平顶刚度退化三线型模型。

RESEARCH ON QUASI-STATIC TEST OF REINFORCED CONCRETE SHEAR WALLS WITH DIFFERENT SHEAR-SPAN RATIO

Quasi-static test of three reinforced concrete shear walls are carried out under low cyclic repeated loading.The relationship between force and displacement is obtained.Through comparing the destructed behaviors and grades of the walls under different shear span ratio based on the analysis of test and hysteretic curve,it can be concluded that for the walls of shear failure,the stiffness and carrying capacity quickly fall when the stiffness and load are not degenerate sharply in the displacement control loading stage,which should be avoided in engineering design;for the wall of flexural failure with good ductibility and energy dissipative capability,the stiffness and carrying capacity fall slowly,which should be adopted in engineering design.For the choice of hysteresis loop model,three-linear model of sloping stiffness degradation or two-linear model of sloping stiffness degradation is suggested for the smaller shear-span ratio,and three-linear model of even stiffness degradation is suggested for the larger shear-span ratio.