多点激励下结构地震响应计算拟静力位移法讨论

Discussion on the Pseudo-static Displacement Method for Seismic Analysis of Structures under Multiple Excitations

针对解决多点激励下结构地震响应的拟静力位移法被广泛使用,但其引入的拟静力位移物理意义并不十分明确,忽略因为地面运动引起的阻尼力也不合理。通过对一个门式刚架的计算分析,说明拟静力位移法有可能低估结构的响应,从而影响结构的安全,并就此给出建议。

The pseudo-static displacement method is widely employed in seismic analysis of structures under multiple excitations. But the introduction of pseudo-static displacement has no strong physical background. It is unreasonable to neglect the damping due to velocity excited by the ground velocity. Based on the analysis of a portal frame, it is shown that the structural response might be under-estimated by the pseudo-static dynamic analysis and the structural safety might be endangered. Some suggestions are also presented.