非一致地震动作用下隔震连续梁桥的非线性随机振动分析方法及动力响应研究

The construction and planning of seismically isolated bridges of China are increasing with year, yet the seismic analysis methods for seismically isolated bridges are not mature. Therefore, it is necessary to perform an in-depth study on the seismic analysis methods and seismic responses of seismically isolated bridges, particularly the widely used seismically isolated continuous beam bridges. This project will take account the random nature as well as the spatial variability of ground motion, and the nonlinearity of the structure. This project will study and develop novel equivalent linearization methods and efficient Monte Carlo simulation techniques for seismically isolated continuous beam bridges. Also, characteristics of the dynamic responses of seismically isolated continuous beam bridges will be studied through the perspective of nonlinear random vibration. A successful implementation of this project will: (1) provide new tools to efficiently and accurately analyze the stochastic dynamic responses of seismically isolated continuous beam bridges; and (2) establish understandings on the characteristics of dynamic responses of seismically isolated continuous beam bridges, so that it can provide reference to the seismic/seismic-isolation performance analysis of seismically isolated continuous beam bridges.

我国隔震桥梁的建设和规划正逐年增加，而隔震桥梁的抗震分析方法尚未成熟，因此有必要对隔震桥梁特别是应用广泛的隔震连续梁桥的地震响应分析方法及地震响应规律展开深入研究。本项目将考虑地震动的随机性、空间变异性以及结构的非线性，针对隔震连续梁桥进一步研究和发展新型等效线性化方法和高效蒙特卡罗模拟方法，并从非线性随机振动的角度研究隔震连续梁桥的地震响应规律。本项目的顺利实施，将有助于：(1)为精确高效地分析隔震连续梁桥的随机地震响应提供理论工具；(2)建立对非一致地震动作用下隔震连续梁桥动力响应的规律性认识，为隔震连续梁桥的抗震/隔震性能分析提供参考。

项目严格按照计划执行，重点研究了：(1)隔震连续梁桥非线性随机振动问题的新型等效线性化方法；(2)隔震连续梁桥非线性随机振动问题的高效蒙特卡罗模拟方法；(3)非一致地震动作用下隔震连续梁桥的随机动力响应。项目针对隔震连续梁桥进一步研究和发展新型等效线性化方法和高效蒙特卡罗模拟方法，并从非线性随机振动的角度研究隔震连续梁桥的地震响应规律。项目目前无直接的应用，但未来将有助于：(1)为精确高效地分析隔震连续梁桥的随机地震响应提供理论工具；(2)建立对非一致地震动作用下隔震连续梁桥动力响应的规律性认识。