既有斜拉桥结构的检测及承载能力评定

发布时间：2019-06-15 16:01

【摘要】：在中国道路网络的建设中,斜拉桥梁正处于迅速发展的阶段。随着我国公路交通中交通流量的不断增大,公路荷载等级的不断提高,重型载重车辆也越来越多,斜拉桥优良的承载能力和使用性能为此提供了很好的解决方案。如同常见的混凝土梁桥一样,斜拉桥梁在运营过程中,各种外在因素的综合作用下,桥梁结构迟早会出现各种类型和程度的损伤和缺陷,使得桥梁的承载水平不再能满足行驶荷载的需求。如何准确的对这些斜拉桥结构进行结构检测和承载能力评定,影响到直接指导结构维修的重要依据是否可信。因而,在既有斜拉桥结构的检测评估与加固处理的特点这一方面开展深入的研究是有一定必要性的。针对以上情况,本文结合某单塔斜拉桥的检测评估开展了以下工作。(1)介绍国内外公路斜拉桥梁建设的状况以及斜拉桥的结构和受力特点,结合既有斜拉桥梁结构检测评估的研究状况,指出了斜拉桥检测评估与维修加固的意义。(2)分析了斜拉桥常见的病害及其形成机理,针对不同的病害介绍了相应的检测方法及其基本理论,并斜拉桥的结构检算和荷载试验进行了介绍。(3)详细阐述了既有桥梁技术状况的评估理论和方法,对每种方法进行了评价,明确了其使用条件,并指出要综合使用各种方法进行桥梁的评定。(4)对某单塔斜拉桥进行了全面的结构检测、结构检算、荷载试验和结构评定,并提出了对该桥加固维修的意见和建议；更进一步,通过对该桥开展的全面的检测及荷载试验,分析了桥梁病害成因和桥梁使用状况。为该桥及同类型的桥梁提供了运营和维修加固的技术资料。
[Abstract]:In the construction of Chinese road network, the beam of cable-stayed bridge is in the stage of rapid development. With the increasing traffic flow in our country, the road load class is increasing, and the heavy-duty vehicle is getting more and more, and the cable-stayed bridge has excellent bearing capacity and service performance. As with the common concrete beam bridge, in the course of operation, the bridge structure of the cable-stayed bridge will have various types and degree of damage and defect sooner or later, so that the bearing level of the bridge can no longer meet the requirements of the running load. How to accurately detect the structure of these cable-stayed bridges and the evaluation of the carrying capacity of the cable-stayed bridge has an impact on the credibility of the important basis for directly guiding the structure of the cable-stayed bridge. Therefore, it is necessary to carry out in-depth research on the characteristics of the detection and evaluation of the existing cable-stayed bridge structure and the characteristics of the reinforcement treatment. In view of the above situation, the following work is carried out in connection with the detection and evaluation of a single-tower cable-stayed bridge. (1) The construction status of cable-stayed bridge at home and abroad and the structure and force characteristics of cable-stayed bridge are introduced, and the significance of the evaluation and maintenance of cable-stayed bridge is pointed out. (2) The common diseases and the formation mechanism of the cable-stayed bridge are analyzed, and the corresponding detection method and the basic theory are introduced for different diseases, and the structural check and load test of the cable-stayed bridge are introduced. (3) The evaluation theory and method of existing bridge technical condition are described in detail, each method is evaluated, its use condition is defined, and it is pointed out that it is necessary to comprehensively use various methods to evaluate the bridge. (4) The comprehensive structure detection, structural check, load test and structural evaluation of a single-tower cable-stayed bridge are carried out, and the opinions and suggestions on the reinforcement and maintenance of the bridge are put forward, and further, through the comprehensive test and load test on the bridge, The cause of the bridge and the use of the bridge are analyzed. Technical data for the operation and maintenance of the bridge and the same type of bridge are provided.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U446;U448.27

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