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主跨采用斜拉桥体系,边跨采用连续结构的斜拉-连续协作体系桥梁近年来在中国得以推广应用。该文以某实际工程为依托,采用Midas/Civil软件建立结构有限元模型,对该桥进行静力、动力特性分析,得到该体系桥梁的内力、变形、自振频率及振型结果。研究结果表明:斜拉-连续协作体系桥梁是一种介于柔性与刚性之间的桥梁,其弯矩分布类似连续刚构桥,跨中正弯矩仅为支点负弯矩的9%,主跨变形类似斜拉桥,主梁面内稳定性超出斜拉桥最小安全度49.2%。该桥1阶振型周期仅为等跨径斜拉桥的55%,其自振振型存在相邻频率接近,模态较为密集的特点。
The main span uses the cable-stayed bridge system, and the bridge with the continuous structure of cable-stayed-continuous collaboration system in the side span has been popularized and applied in China in recent years. Based on a practical project, this paper uses Midas / Civil software to establish the structural finite element model, and analyzes the static and dynamic characteristics of the bridge. The internal forces, deformation, natural frequencies and mode shapes of the bridge are obtained. The results show that the cable stayed bridge is a kind of bridge between flexibility and rigidity. Its bending moment distribution is similar to that of continuous rigid frame bridge. The span-to-center positive moment is only 9% of the negative moment of the fulcrum. The main span Deformation similar to cable-stayed bridge, the main girder in-plane stability beyond the minimum safety of cable-stayed bridge 49.2%. The first-order mode vibration period of the bridge is only 55% of that of the equivalent span cable-stayed bridge. The self-oscillation mode has the characteristics of adjacent frequencies and dense modes.