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研究了考虑土—结构相互作用下隔震桥梁的随机地震动响应。应用子结构方法将桥梁结构分成上部和下部两个子结构。地基土看作是各向同性的弹性半空间,土对结构的作用简化成水平和转动方向的刚度和阻尼元件。地震动用平稳随机过程模拟,应用虚拟激励法求解结构的随机响应。分析表明,土—结构相互作用对隔震桥梁有一定的影响,但相对非隔震桥梁来说影响较小;即使在地基土较软弱的情况下,隔震措施一直有效的发挥作用,可以说隔震措施对不同的地基土都有一定的适应性或鲁棒性。但是隔震支座在地基情况较差时,位移响应较大,因此在软弱地基应用隔震应特别注意,防止发生碰撞及落梁。
The random ground motion response of isolated bridges considering soil-structure interaction is studied. The substructure method is used to divide the bridge structure into two substructures, the upper part and the lower part. The foundation soil is considered as an isotropic elastic half-space, and the role of soil in the structure is simplified to stiffness and damping elements in the horizontal and rotational directions. The earthquake is simulated by a stationary stochastic process, and the stochastic excitation method is used to solve the stochastic response of the structure. The analysis shows that the soil-structure interaction has a certain influence on the isolated bridge but has less influence on the non-isolated bridge. Even if the foundation soil is weak, the isolation measures have been effective for a long time, so to speak Isolation measures for different types of foundation soil have a certain degree of adaptability or robustness. But the isolation bearings in the foundation conditions are poor, the displacement response is large, so the application of isolation in soft ground should pay special attention to prevent the collision and fall off the beam.