Abstract

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

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.