基于精细积分法的结构碰撞反应谱研究

碰撞是导致结构地震破坏的重要原因之一,其与两碰撞结构的动力性能和地震作用密切相关,应给出与两个结构动力参数相关的反应谱,以指导结构考虑碰撞的抗震设计。本文给出相邻结构碰撞加速度反应谱定义,推导了精细积分法碰撞计算公式,进行了该反应谱曲面的分析和探讨。结果表明,精细积分法适用于结构碰撞问题的计算,可得到高精度的解,无条件稳定且可提高计算效率。碰撞会加大结构的加速度响应;动力特性相同的两相邻结构产生的响应有差异;增大阻尼比和相邻结构阻尼比差别、以及设置足够大的初始间隙,可有效降低结构的碰撞响应。

Structural impact response spectra based on precise time-integration method

Collision is one of the main reasons leading to damage under earthquake excitation,it is closely related to structures’ dynamic characteristics and earthquake excitation.Response spectrum for two adjacent structures with dynamic parameters should be given,and seismic design will be guided.Pounding acceleration response spectrum for two adjacent structures was defined in this paper,calculation formula of pounding based on precise time-integration method was derived,and the response spectrum was analyzed and discussed.The results of the study indicate that precise time-integration method which has high accuracy ， unconditionally stable and efficiency is suitable for the structure of pounding problem.The acceleration response of structures will be increased because of pounding，response is different between the two adjacent structures with the same dynamic characteristics.When the damping ratio and difference of damping ratio increasing，or the enough initial gap is set up, the impact response of the structure will be reduced effectively.