中承式系杆拱桥自振特性影响因素分析

采用大型结构通用软件Midas/Civil,对一座中承式钢筋混凝土系杆拱桥进行了结构自振特性的数值模拟分析,取得了结构自振频率和自振振型等动力参数,并对振型进行了描述,通过变换桥梁的主要结构参数来对比分析了它们对结构自振特性的影响.计算结果表明,桥面板的厚度、混凝土弹性模量以及拱肋刚度的变化均对自振特性有重要影响,研究结论可以为同类桥型的设计提供参考.

Analysis on the Influence Factors of Natural Vibration Characteristics of Half-through Tied-arch Bridge

Numerical simulation analysis of natural vibration characteristics of a half - through tied - arch bridge has been done with common software for large scale structures - - Midas/Civil. Kinetic parameters such as natural vibration frequency and vibration mode have been obtained and the vibration mode has also been described. The main structure parameters of the bridge have been changed to see its influence to the vibration characteristics of the bridge. The result shows that： the thickness of the bridge deck, elasticity modulus of concrete as well as the change of severity of arch ribs all have influence to the vibration characteristics. And the result can provide further reference to the bridge of the same type.