BFRP布加固双曲拱桥的非线性有限元分析

Nonlinear FEM Analysis of Two-Way Curved Arch Bridge Reinforced by BFRP

目的研究BFRP布加固双曲拱桥的力学特性,证明BFRP布加固双曲拱桥的有效性.方法针对敖汉危旧双曲拱桥病害产生的机理,基于有限元结构计算方法,借助ADINA计算机程序建立三维有限元模型,对该桥采用粘贴BFRP布加固后的静动力特性进行研究.结果 BFRP布加固双曲拱桥拱肋加固方案可有效降低拱顶、拱脚等关键截面的压应力,增强结构的抗弯及抗扭性能.加固后具有较好的整体工作性能;处于弹性工作状态;荷载增至公路-Ⅱ的1.9倍,具有足够的安全储备.结论采用笔者方法加固该桥型拱肋是有效的,且具有较高的性价比,研究成果对类似桥梁工程的加固具有参考价值.

The target of this test is to research the mechanical characteristics of two-way curved arch bridge reinforced by BFRP,and prove that the method is effective.Considering the cause of old and dangerous two-way curved arch bridge,Aohan,static and dynamic characteristics of the bridge are studied by being reinforced by BFRP with Nonlinear FEM Analysis and ADINA establishing 3-D finite element model.Reinforcement of arch rib with BFRP can reduce the compressive stress in the apex of arch,springing and other key sections,and enhance the bending and torsion resistance properties of the structure.After reinforcement,it has a better overall performance and keeps a flexible working condition.And if the load becomes 1.9 times that of road-Ⅱ,it has enough extra ability to be functionable.The method to reinforce arch bridge type is effective and deserves the cost.The result of the research is important and valueable to bridges in the simiar situations.