ANTI-COLLAPSE PERFORMANCE OF STEEL MOMENT FRAME WITH DUAL-ACTION STEEL DAMPERS UNDER COLUMN REMOVAL SCENARIO

To investigate the progressive collapse behavior of steel moment frame with damper, a new-type mild damper consisting of cruciform steel plates is designed. The mechanical properties of the damper are validated through the theoretical calculation, previous tests and numerical analysis,  respectively  while  the  accuracy  of  model  structure  is  validated  with  different  FEM  software. Therewith,  the  studies  on the progressive collapse and seismic design of an in-plane model structure with new-type dampers are conducted. It is found that the progressive collapse resisting capacity of the structure is improved resorting to the damper. Better catenary action exists in the in-plane model structure with damper while the anti-seismic ability of structure becomes poor. Considering the spatial effect of structure, the optimization of damper arrangement is conducted for the seismic design. The results demonstrate that the dual action of damper, namely for the progressive collapse and seismic designs, could be guaranteed simultaneously in three-dimensional (3-D) structure. The  analysis  results in this  paper  provide a reference for the unified design of resisting the earthquake and vertical progressive collapse.

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Pengfei Wang, Shan Gao, Sheliang Wang, Xiaofei Wang