混合梁弯塔斜拉桥动力模型试验及理论分析

Dynamic model test and theoretical analysis about cable-stayed bridge with hybrid beam & curve tower

为研究斜拉桥的动力性能,对一座特殊形式的混合梁弯塔斜拉桥进行了缩尺模型的自振频率及振型测试,并用ANSYS程序建立了空间有限元模型,对动力特性进行理论计算和分析,二者结果基本一致,说明试验结果的准确性可信.并应用理论模型分别计算分析了相应琴桥形式的直塔和混凝土加劲梁动力特性, 比较结果表明,主梁材料的变化对结构动力性能影响不大,而桥塔的曲直对结构动力性能有较大影响.

A special hybrid beam and curve tower cable stayed bridge model is tested about the natural frequency and modes. ANSYS program is used to build special FE model and calculate the dynamic properties. It shows the experiment results are accurate that the two results are similar. The FE model is changed tower type and material of beam respective, and the natural frequency and modes are calculated respective also, From results, it can concludes that material changing of beam will affect of dynamic properties little. The type of tower will affect the dynamic properties quite a few. The bridges with straight tower will have more excellent dynamic properties than the bridges with curve tower. Aim at esthetics value, the transnormal structural type of bridges will still be designed widely if only structural mechanical performance is at the rational fields.