东方大桥自振特性分析

以常州市京杭运河改线段改建工程——东方大桥为研究对象,借助ANSYS有限元程序,建立了飞燕式钢管混凝土提篮拱桥的空间力学计算模型。利用子空间迭代法计算了桥梁结构的自振频率和振型,对桥梁的模态特性进行了分析。结果表明,桥梁的面内刚度相对于面外刚度较小。计算结果可为桥梁的设计、施工以及使用阶段的健康检测和维护提供技术参数和依据。

Dynamic analysis of natural vibration characteristics for the Eastern Bridge

The dynamic behaviour of natural vibration characteristics of the Eastern Bridge in Changzhou city was studied.The ANSYS was adopted to set up a three-dimensional finite element model for a flying swallow type CFST arch bridge of the main bridge.The natural periods and modes of the CFT arch bridge were calculated using the subspace iteration method.Meanwhile its modal characteristics were analyzed.The results showed that the stiffness of bridge in-plane was smaller than that of out-plane.The calculating results could offer the related technical parameters and basic data for the design and the construction of the bridge as well as the health detection and maintenance of the bridge in working conditions.