考虑楼板影响的RC框架结构连续性倒塌动力响应分析-《建筑科学与工程学报》

文章信息/Info

Title:: Dynamic Response Analysis on Progressive Collapse of RC Frame Considering Contribution of Slab

Author(s):: LUO Wei-gang, HEI Xiao-dan, LIU Ji-bin, LI Xiao-lu; School of Civil Engineering, Lanzhou University of Technology

Keywords:: progressive collapse; slab; dynamic response; columnremoval time; initial condition

摘要:: 针对当前钢筋混凝土（RC）结构连续性倒塌的研究大多忽略楼板的影响，且使用零初始状态分析结构柱失效后的连续性倒塌与实际情况不相符的问题，采用非线性动力分析方法，以有限元软件ABAQUS为平台，应用基于UMAT二次开发接PQ-Fiber的本构关系，研究了结构在角柱失效后楼板对结构抗连续性倒塌的影响及拆柱时间和初始状态对剩余结构动力响应的影响。结果表明：考虑楼板影响的结构动力响应明显小于不考虑楼板影响的情况，可见楼板对结构抗连续性倒塌能力提高显著；拆柱时间小于剩余结构自振周期的1/4时，拆柱时间越小，结构动力响应越明显，对结构抗连续性倒塌危害也越大；对比不同初始位移和初始速度状态下结构的动力响应，不考虑初始状态的结构连续性倒塌分析低估了初始状态对结构变形的影响。

Abstract:: Aiming at the question that the contribution of slab was ignored in most studies of progressive collapse of reinforced concrete (RC) structure, and the analysis on progressive collapse after the loss of corner column by the zero initial conditions couldn’t reflect the fact. With finite element software ABAQUS and the secondary development interface of UMAT PQ-Fiber construction relation, the nonlinear dynamic approach was applied to study the contribution of slab after the loss of corner column, the column-removal time and initial condition in the progressive collapse resistance. The results indicate that the dynamic response of structure considering the contribution of slab is less than the structure without considering the contribution of the slab, the improvement of slab in progressive collapse resistance is significant. When columnremoval time is smaller than 1/4 of the natural vibration period of remaining structure, the smaller the column-removal time is, the more obvious the structural dynamic response is, and the greater the damage to the progressive collapse resistance of structure is. Compared with the dynamic responses of structures under different initial displacements and initial velocities, the analysis of structure progressive collapse without considering the initial condition underestimates the influence of initial condition on the deformation of structure.