混凝土刚架拱桥病害及加固措施浅析

通过对混凝土刚架拱桥的常见病害进行系统分析,根据不同病害提出相应的加固措施,并对加固后的运行情况进行定期观察。

井岸大桥钢筋锈蚀检测

在已有的桥梁建筑中 ,大部分桥梁都是钢筋混凝土桥梁。钢筋混凝土桥梁随着使用年期的延长 ,或环境因素的影响 ,都不可避免的出现钢筋锈蚀问题。因此 ,如何防止钢筋锈蚀是桥梁养护工作的一个重要问题。结合井岸大桥钢筋锈蚀的电化检测实例 ,介绍了桥梁构件的钢筋锈蚀机理及CSE半电池检测原理和方法 ,并通过对检测结果的分析 。

南平市316国道太平大桥改建工程——旧桥上部结构拆除施工

南平市316国道太平大桥旧桥为现浇钢筋混凝土刚架拱,为轻型桥梁。随着国民经济发展,交通量逐渐增大,该桥主要部件缺损、结构混凝土裂化,存在较大的安全隐患。基于详细的检测结果,南平市公路局对多种改建方案进行比选,最终决定采用"利用桥梁下部,拆除上部结构"的重建方案。在桥梁改建过程中,在桥梁两岸(纵桥向)架设通长架桥机(全长116m),并因地制宜改造旧桥墩设置墩顶架桥机中支腿,利用架桥机卷扬机行走天车将旧桥上部构筑物逐步吊装移除。该拆除旧桥上部结构方法的顺利实施为福建省乃至全国此类轻型桥梁上部拆除改建提供了成功的经验,值得推广借鉴。

Approach for analyzing the ultimate strength of concrete filled steel tubular arch bridges with stiffening girder

A convenient approach is proposed for analyzing the ultimate load carrying capacity of concrete filled steel tubular (CFST) arch bridge with stiffening girders. A fiber model beam element is specially used to simulate the stiffening girder and CFST arch rib. The geometric nonlinearity, material nonlinearity, influence of the construction process and the contribution of prestressing reinforcement are all taken into consideration. The accuracy of this method is validated by comparing its results with experimental results. Finally, the ultimate strength of an abnormal CFST arch bridge with stiffening girders is investigated and the effect of construction method is discussed. It is concluded that the construction process has little effect on the ultimate strength of the bridge.