既有桥梁的技术检定试验研究

Research on Technique Check for Existing Bridge

在一定的运营年限后,由于周围环境的影响,既有桥梁的工作条件会有所恶化,如梁体混凝土的老化、裂缝的开展、钢筋的锈蚀等因素,除此之外,桥梁的过载量也超过以前.因此,对既有桥的技术检定试验研究是一项具有现实工程意义和长远意义的任务和课题.本文中,针对一座既有的铁路桥梁,从静载测试和动载测试两个方面出发,对该桥的第一孔和第三孔的梁体进行了现场测试,并依据现行的"铁道部铁路桥梁鉴定规范"对桥梁的一些主要指标进行了评估,为桥梁的养护提供了必要的理论依据和技术数据.

After a fixed number of years' operation, the work condition for the existing bridge would deteriorate due to the ambient effect, such as concrete aged, crack developed, bar rusted and so on. In other side, overloading of the bridge is larger than before. Thereby, the test is an important thing for realism engineering and long_term project. In this article, we test the fist span and the third span in two aspects, which are dead_loading test and mobile_loading test, then according to the present criterion, we evaluate the major guidelines. So the principal gist and the technique data are presented in this article.