大跨度钢桁架拱桥二阶静风稳定性分析方法研究  

Analysis Method of the Second Order Aerostatic Stability for Long-span Steel Truss Arch Bridge

作　　者：孙雪平 郑冰[1] 胡杰[1] 

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070

出　　处：《公路工程》2017年第5期337-342,共6页Highway Engineering

摘　　要：钢桁架拱桥以其优美的结构形式、较强的跨越能力成为城市中跨越大江大河应用最广的桥型之一,其施工中的稳定性问题也是桥梁设计者们关注的焦点之一。根据二阶静风稳定分析的基本理论,阐述了基于通用有限软件ANSYS的二阶静风稳定性的分析方法。并以一座主跨400 m的钢桁架拱桥为例,研究了该桥在施工过程中的二阶静风稳定性问题。分析结果表明:在拱肋合拢前、刚性系杆合拢前和成桥状态3种控制工况下100 a重现期的静风荷载作用时,该桥具有良好的抗风稳定性。通过参数分析得到:在合理范围内,施工荷载和扣索索力变化对结构抗风稳定性的影响有限,而吊杆非保向力对其影响显著。Steel truss arch bridge with its beautiful structure and large spanning capacity b e c o m eone of the most widely used type of city bridges across the rivers. however , construction also is the focus of attention for designers. According to aerostatic stability analysis , it described the analysis me t h o d of second - order static wind stability basedon the finite element software ANSYS . In this paper , with a 400 m main span steel truss arch bridge as background , study the aerostatic stability during construction. T h e results indicate before the arch rib closed , the rigid rod closed and o p t i m u m completion state , the safety and stability of the steel truss arch against the wind is fine when 100 years return period wind action. It obtained by parametric analysis within a reasonable range ： the impact of construction loads and cable tension to the structure wind resist-ant stability is limited , but the influence of non - directional loads of hanger rod is significant.

关 键 词：钢桁架拱桥 抗风稳定性 非线性屈曲分析 二阶稳定性 吊杆非保向力 

分 类 号：U448.224[建筑科学—桥梁与隧道工程]