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预应力混凝土桁式组合拱桥病害分析及加固技术分析.docx
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摘 要
随着经济的发展,道路交通量和车辆荷载的大幅度增加,一部分桥梁不可避免地暴露出各种结构损伤。因此,旧桥的评估和加固越来越受到重视。对旧桥进行合理的评估和加固方案的选择,使资金在发挥最大效益的同时让桥梁得到最有效的加固维护,是需要妥善解决的课题。
预应力混凝土桁式组合拱桥是上世纪八、九十年代在贵州省建造较多的拱桥, 为拱桥的发展作出了一定的贡献,但经过若干年的使用后,相继出现了开裂、变形、承载力降低等问题。
目前常用的加固方法有增大截面加固法、预应力加固法、粘贴钢板加固法、碳纤维布加固法、喷射混凝土加固法等。在众多的钢筋混凝土结构加固方法中, 粘贴钢板加固法、加大截面加固法和碳纤维布加固法最为常用,文中对这三种方法各自的原理和计算进行了较为详细的介绍。
本文以贵州省花鱼洞大桥为例,首先对桥梁病害的成因进行了分析,然后提出了增设构件、粘贴钢板与碳纤维布等综合加固方法,并运用有限元软件桥梁博士和ANSYS进行了加固计算。加固后的承载力满足要求,目前该桥运行良好。
关键词:预应力混凝土桁式组合拱;病害分析;加固方法;加固计算
ABSTRACT
With the development of economy and in.ease of vehicle in China,there exist inevitably structural defects in some existing bridges.Thus the reliability assessment strengthening technologies for existing bridges is ing more important.The reasonable assessment a lot of investment,and at the same and time strengthening
scheme the most effective scheme Call be obtained.
Prestressed concrete bined arch bridge has been constructed in Guizhou province at 1 980s~1990s.It contributed to the development of arch bridge.After several years use,the disease of cracks and deformation has appeared on it.
The reinforcement methods in coinlnon used is increase cross-section
reinforcement method,prestressed reinforcemem method,paste plate reinforcement method,carbon fiber reinforced plastic methodjet concrete reinforcemem method and SO on.Among the many methods of reinfomemem in concrete structure,paste plate reinforcement method,increase cross.section reinforcement method and carbon fiber reinforced plastic method is widely used.This paper introdu.ce the principle and calculation of the three methods.
In the thesis,as an example of Huayudong bridge in Guizhou province,firstly analysed the causes of bridge disease,then put prehensive methods of reinforcement,including additional members, steel plate and acarbon fibre. Calculations were performed by finite element software Doctor Bridge and ANSYS. Capacity reinforced met demand of Code,the bridge is in good condition.
KEY WORDS:Prestressed Concrete bined 内容来自淘豆网www.taodocs.com转载请标明出处.
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