利用midas fea对桥梁加固效应的分析分析-analysis and analysis of bridge reinforcement effect by midas fea.docx

摘 要
目前我们国家交通事业发展迅猛,但总的情况看来我国东部、中部到西部地区,在未来 10 到 20 年内,新建工程逐渐减少,桥梁的养护、维修、加固及改造工程逐渐成为主流。从我国及世界建设运营情况看,将有大量的桥梁或多或少地出现不同的病害,只要社会效益、经济效益上有价值,都值得加固。实际这样的桥梁加固工程越来越多,而有关桥梁加固设计与计算的研究还相对滞后。
本文对常用桥梁的病害及加固方法进行了详细说明,并且利用软件 MidasFEA 对加固后的效果进行评价。同时对预应力混凝土 T 形截面梁进行仿真分析,研究了增大截面、粘贴碳纤维、粘贴钢板以及混合加固等几种常见方法的加固效应,分析了各加固措施对其正截面极限抗弯承载力、挠度、刚度、塑性变形能力以及裂缝开展情况等方面的影响, 总结出几种加固方法的优缺点,方便实际工程的应用。本文还对几种加固情况进行预应力混凝土构件正截面抗弯承载力的计算程序,对有限元仿真分析结果进行了验证。研究发现,增大截面并粘贴钢板的混合加固法在提高预应力混凝土 T 形截面梁的正截面极限抗弯承载力、抑制裂缝发展、改善构件刚度等方面效果最为显著,但可能会降低构件的塑性变形能力;粘贴碳纤维法及粘贴钢板法均能有效改善构件塑性变形能力,但对于截面高度较大的构件,粘贴碳纤维法在提高其正截面抗弯承载力方面并无明显效果,建议实际工程中慎用;
关键词:梁桥,加固,效应,有限元,MidasFEA 分析
Abstract
At present our country transportation industry developing rapidly, but general situation view, Chinese eastern, central to western region's new construction gradually reduce, the bridge maintenance, repair, reinforcement and reconstruction project is ing mainstream in the next 10 to 20 years. From our country's construction and operation situation, there will be a large number of bridges more or less appear different diseases, as long as there is social benefit and economic benefits, are worthy of reinforcement. Actually those engineering of bridges’ strengthening are more and more, but the research of bridges’ reinforcement design and calculation still lags behind relatively.
In this paper, the bridge reinforcement method such as enlarging section method, sticky fiber method, paste steel and hybrid strengthening method is described in detail, and using software MacAfee to evaluate the effect of reinforcement. It simulates the performance of
priestesses concrete T beams,studying the strengthening effect of five types of measures,
such as carbon fiber adhesion method,steel plate adhesion method, section-enlarging method and steel plate carbon fiber plus section-enlarging method. It analyzes their strengthening
effects , including ultimate flexural capacity , deflection , rigidity , ductility and creak
propagation,and summarizes their advantages and dis