钢管混凝土系杆拱桥空间建模技术及其动力特性分析

Spatial Modeling for CFST Arch Bridge and Analysis on Its Dynamic Characteristics

桥梁结构的动力特性是其动力性能分析的重要参数,包括自振频率、振型及阻尼比等,它反应了桥梁的刚度指标,因此它对于正确地进行桥梁的抗震设计、车振分析及抗风稳定性分析等都有着重要的意义。针对某一市政钢管混凝土系杆拱桥,建立其正确的有限元模型,使其计算结果为动力测试提供帮助,并对桥梁的可靠度进行评价。因此本文首先研究桥梁的建模技术,并对桥梁进行动力特性计算,得到其模态参数,为该桥的动力测试提供一些参考,也为该桥的检测加固提供理论数据;同时对桥梁的动力性能做出评价,这有助于对桥梁的安全诊断评估。结果显示,该桥梁的实际刚度较大,整体性能较好,具有良好的动力性能。

Bridge＇s dynamic characteristics are the important parameters of the dynamic performance analysis, including the natural frequency, vibration mode, damping ratio, etc., and reflect the stiffness index. Therefore, the bridge＇s dynamic characteristics have important significance for the seismic design, vehicle-bridge vibration analysis and the wind-resistant stability of the bridge. Aiming at a municipal CFST arch bridge, the correct finite element model of the bridge should be built, the finite element results could be made helpful in dynamic test, and the reliability of the bridge should be evaluated. Therefore, the modeling technique for the bridge is studied first, and the dynamic characteristics of the bridge are calculated to obtain its modal parameters, so as to provide some references for the dynamic test of the bridge and provide the theoretical data for the inspecting and strengthening of the bridge. At the same time, the evaluation for the dynamic performance of the bridge must be made, which will be helpful in the safety evaluation of the bridge. The results show that the bridge＇s stiffness is bigger, its monolithic performance is finer, and it has the well dynamic performance.