Flexibility based finite element method for inelastic seismic response analysis of reinforced concrete space frames

Based on the analytical model for the beam column element using the finite element flexibility method and fiber model, a program was developed for inelastic seismic response analysis of reinforced concrete space frames. Its accuracy was verified by comparison of the shaking table experimental results of a six story reinforced concrete setback frame to the computed results. The simulation analysis results of the earthquake shake table test showed that the fiber model beam column element had well enough simulation ability to earthquake response of the low middle damage structures. As to structures existing in severe damage stage,simulative structural displacements and extent of the damage would be less than actual structural displacements and extent of damage. These may be caused by the fact that the fiber model beam column element coded presently does not account for the bond slippage of reinforced bars and cast in site floor slabs are treated simply as rigidity, whereas the rigidity will degrade apparently in course of the test.