【摘要】 引入只受拉三维拉索单元,采用考虑几何非线性的子空间迭代法对黄河大峡水库下游某双索悬索桥自振特性进行分析,理论值与实测值能较好的吻合,说明该空间非线性有限元分析方法的正确性;进而将该桥与相同跨径和结构参数的单索悬索桥的自振频率、振型进行对比分析,结果表明双索悬索桥能有效提高桥梁一阶竖弯振动频率。最后,讨论恒载集度、加劲梁刚度、矢跨比等结构参数变化对双索悬索桥自振特性的影响,为双索悬索桥结构设计理论提供了动力性能方面的依据。更多还原

【Abstract】 Taking the double-cable suspension bridge located in the lower reach of the Huanghe Daxia Reservoir as an example,the natural vibration characteristics of the suspension bridge are analyzed by introducing in 3-D tension-only elements and adopting the subspace iteration method of the geometrical nonlinearity nature.The theoretical analyses coincide with the measured data,which indicates the nonlinear finite element analysis method is correct.The natural vibration frequencies and types are compared with those of the singlecable suspension bridge with the same span lengths and structure parameters.The results show that the double-cable suspension bridge can raise the vertical base frequency effectively.The effects on natural vibration characteristics of double-cable suspension are discussed when changing the structure parameters such as the dead load intensity,stiffening girder stiffness,ratio of rise to span, and so on.The basis of dynamic characteristics is given for the design theory of the double-cable suspension bridge.更多还原