连续梁桥减、隔震体系的优化设计

本文根据连续梁桥减、隔震体系设计的特点,建立了桥梁减、隔震体系优化设计公式,实现了应用结构最优化设计理论设计桥梁减、隔震支座动力控制参数,使得桥梁墩、台所受到的地震水平力最小的同时满足小震作用下桥梁结构保持弹性;强震作用下减、隔震支座发生弹塑性变形耗散地震能量的减、隔震设计思想.通过编制的桥梁减、隔震体系优化设计程序,对连续梁桥减、隔震体系优化设计进行了算例分析,得出了一些有用的结论.

OPTIMAL DESIGN OF SEISMIC ISOLATION SYSTEM FOR CONTINUOUS BRIDGE

In this paper, according to the behavior of seismic isolation system for continuous girder bridges, the optimal design formulas of seismic isolation system for continuous bridge are established. An optimal technique is applied to design the dynamic control parameters of the isolation bearings of the bridge. Accordingly, in addition to minimization of shear force of piers and abutments under a major earthquake, the continuous bridge is designed to satisfy the current earthquake-resistant design principle; the bridge structure remains elastic when subjected to a minor earthquake, while the isolation bearing can undergo inelastic deformation to dissipate the seismic energy under a major earthquake. In compilation of the design progrom of seismic isolation system for continuous girder bridges, the optimal design example of a bridge supported on the isolation bearings has been investigated and some useful conclusions have been drawn.