框架-阻尼框筒结构抗震性能模型试验研究

Experimental study on seismic behavior of frame-damping-frame-tube structure

为了验证框架-阻尼框筒结构的抗震性能,通过对1∶2缩尺的两层单跨阻尼墙-框架结构模型开展往复加载试验,研究在循环荷载作用下结构模型的破坏特征、承载力、延性、刚度退化、承载力退化和耗能能力。结果表明:随着位移的增加,阻尼墙最先屈服,然后梁出现塑性铰,最后柱出现塑性铰;整体结构屈服荷载和峰值荷载分别为1012.5 kN和1253.7 kN,极限层间位移角为1/31,位移延性系数超过4.13,刚度退化平稳,承载力退化缓慢;阻尼墙在屈服前为结构提供50%刚度,屈服后为结构提供34%~45%的承载力;框架-阻尼框筒结构在多遇地震和罕遇地震作用下的层间位移角限值可分别取1/550和1/50。

In order to verify the seismic performance of frame-damping-frame-tube structural system,through the displacement reciprocating loading test of a 1∶2 scale two-story single span damping wall-reinforced concrete frame structure model,the failure characteristics,bearing capacity,ductility,stiffness degradation,bearing capacity degradation and energy dissipation capacity of the model under cyclic load were studied.The results show that with the increase of displacement,the damping walls yield firstly,then plastic hinges occur in the beams,and finally plastic hinges occur in the columns.From the results,the yield bearing capacity and peak bearing capacity of the structure are 1012.5 kN and 1253.7 kN respectively.The results indicate that the ultimate story drift is 1/31,the displacement ductility exceeds 4.13,and the model exhibits stable stiffness degradation and mild bearing capacity degradation.Damping wall provides a 50%stiffness contribution to the structure before yielding and a 34%-45%bearing capacity contribution to the structure after yielding.The limit values of story drift of frame-damping-frame-tube structure under frequent earthquake and rare earthquake can be taken as 1/550 and 1/50 respectively.