【摘要】 自锚式悬索桥的动力特性主要包括体系的自振频率和主振型,它是自锚式悬索桥动力分析的基础和前提.通过建立空间有限元模型及工程实例,给出了前20阶频率和相应的振型,分别计算了恒载、加劲梁刚度、塔架刚度、矢跨比等结构参数变化对自锚式混凝土悬索桥动力特性的影响,并与相同跨径和结构参数的1座地锚式悬索桥进行了比较,对影响规律做了详细的讨论.更多还原

【Abstract】 Dynamic characteristics of self-anchored concrete suspension bridge mainly include natural vibration frequency and principal mode, which is the base and precondition of dynamic analysis for self-anchored suspension bridge. Lanqi Songhua River Bridge, a concrete self-anchored suspension bridge with the main span of 240m, is taken for example, the first 20 frequencies and corresponding vibration modes are given by using space finite element model. The effects of varieties of dead load, rigidity of stiffening girder, stiffness of tower, rise-span ratio on dynamic characteristics of self-anchored concrete suspension bridges are computed. The results are compared with those of an earth-anchored suspension bridge with the same span and structure parameter. The influence regulations are discussed in detail.更多还原