【摘要】 试验表明,由于自复位摩擦耗能支撑(SCED)内外管的长度误差,会导致支撑初始刚度的试验结果小于理论值,由此可能会对采用SCED的支撑框架地震响应产生一定影响。基于SCED的构造和工作原理,讨论内外管长度误差对支撑初始刚度的影响,并得到SCED初始刚度的折减范围是(50%~100%)理论值。然后以此为依据,分别建立支撑初始刚度为50%、75%和100%的3层和9层的SCED钢框架,同时选取22条地震波以用于模型的非线性时程分析,结果表明:支撑初始刚度的折减对9层SCED框架最大层间位移角的影响要小于3层SCED框架;结构的最大层间位移角会随支撑初始刚度的折减而增加,但不会影响结构的自复位能力;支撑初始刚度的折减会减小9层SCED框架的层加速度,但对3层SCED框架却没有显著的影响。更多还原

【Abstract】 According to experiment results, the length tolerances between inner and outer tube of self-centering energy dissipative(SCED) brace leads to a reduction of initial stiffness of the brace, compared with its theoretical value. This may have influence on the seismic response of SCED braced frame. Based on the configuration and working mechanism of SCED, the influence of length tolerances of inner and outer tube to the initial stiffness of the brace is discussed, and the theoretical reduction range of initial stiffness of SCED is acquired(50% ~ 100%). Based on this, 3-storey and 9-storey SCED steel frames with brace’s initial stiffness to be 50%, 75% and 100% are established respectively. In the meantime, 22 ground motions are chosen to perform non-linear time historey analysis of the models. The results demonstrate that, the reduction of brace’s initial stiffness has less influence to the inter-storey drift ratio of 9-storey SCED steel frame than that of 3-storey SCED steel frame; the maximum inter-storey drift ratio goes up with the reduction of brace’s initial stiffness, however, the self-centering capacity of the structure stays the same; the reduction of brace’s initial stiffness diminishes the storey acceleration of the 9-storey SCED frame, while it has no significant influence on the 3-storey SCED frame.更多还原