曲线连续箱梁桥震致灾变机理与减隔震设计优化

Taking the practical curved continuous box girder bridge in which engineering diseases have emerged as the research object, by the use of nonlinear finite element method, the mechanical properties of curved continuous box girder bridge will be analyzed under the action of earthquake. Through a large number of computer simulation, the mechanical properties and disaster mechanism of curved continuous box-girder bridge with different span layout, support conditions, support eccentricity and curvatures will be examined under different actions of earthquake, and the finite element analysis results will be updated and validated by the test results from model tests conducted on the shaking table in Beijing University of Technology.Based on the results of finite element analysis and shanking table test on models, perforamnce design targets for the upper and lower structure of curved continuous box girder bridge will be set up, and then, the optimization of design parameters could be conducted, in order to seek a reasonable structural system, appropriate design parameters and a simplified aseismic analysis mechod for curved continuous box girder bridge. Model tests on shaking table will be conducted in the College of Architecture and Civil Engineering Beijing University of Technology to investtigate the mechanical properties of curved continuous box girder bridge under different earthquake motion, input direction of earthquake motion, combing rule and with differnet shock absorption and isolation supportse, which will provide a calculation basis for the optimization design and selection of shock absorption and isolation supports, and aseismic caging devices for curved continuous box-girder bridge, avoiding or mitigating such earthquake damage and hazard eventually.

本项目以实际出现工程病害的曲线连续箱梁桥为研究对象，借助有限元方法，对曲线连续箱梁桥在地震作用下的受力性能进行分析。通过大量计算机模拟分析，研究不同孔跨布置、不同支承类型、不同曲率和支座偏心的曲线连续箱梁桥结构体系在不同地震作用下的受力性能和成灾机理，并通过模型的振动台试验进行有限元分析模型的更新和验证；在有限元分析和振动台模型试验结果的基础上，建立上部和下部结构的性能设计目标，进而进行结构设计参数的优化，寻求合理的曲线连续箱梁桥的结构体系和设计参数，以及简化的抗震分析方法。借助北京工业大学建工学院的九子台阵系统对曲线连续箱梁桥进行模型试验，以研究不同地震波、地震输入方向、组合规则，以及减隔震支座下的力学性能，为曲线连续箱梁桥的减隔震优化设计和抗震限位装置的设置提供计算依据，从而避免或减轻地震作用下曲线连续箱梁桥的灾害损失。

本项目以实际出现工程病害的曲线连续箱梁桥为研究对象，借助有限元方法，对曲线连续箱梁桥在地震作用下的受力性能进行计算模拟。通过大量计算机模拟分析，研究不同孔跨布置、不同支承类型、不同曲率和支座偏心的曲线连续箱梁桥结构体系在地震作用下的受力性能和成灾机理，并通过模型的振动台试验进行有限元分析模型的更新和验证；在有限元分析结果的基础上建立性能设计目标，进而进行结构设计参数的优化，寻求合理的曲线连续箱梁桥的结构体系和设计参数，以及简化的抗震分析方法。借助北京工业大学建工学院的九子台阵系统对曲线连续箱梁桥进行模型试验以验证不同地震波、地震输入方向、组合规则下的受力性能以及减隔震效果，为曲线连续箱梁桥的减隔震优化设计和抗震构造措施设置提供计算依据。