高墩弯箱梁桥震后病害分析与维修加固方法

发布时间：2018-12-06 15:43

【摘要】：预应力混凝土曲线箱梁桥由于抗扭、抗弯刚度大，整体性好，承载力高，线形美观，行车平顺，在我国公路建设中得到了广泛应用。与常用的直线桥梁相比，由于曲率影响，弯扭耦合作用比较明显，如果支座设置不合理，实际应用中易出现横向偏位等病害。本文以某预应力混凝土连续弯箱梁桥为研究对象，，探讨了该桥在地震后发生主梁、桥墩偏位、支座损坏等病害的原因，并探讨了维修加固对策。本文首先对桥梁的病害特征进行了详细调查和描述，根据病害特征，初步判别了桥梁产生病害的主要原因，为后续的结构内力分析提供了依据。其次，根据初步判定的主要原因，采用结构分析的方法，对结构恒载效应、预应力效应、混凝土徐变效应、温度效应、不同等级的地震效应等工况进行了数值分析，研究了不同参数对主梁内力、支座约束反力的影响，从而为判断桥梁病害成因提供必要的参考。再次，根据病害检测结果和结构分析结果，对桥梁病害原因进行了分析，认为桥梁震害的原因主要有三点：地震作用及内力累积综合效应、支座限位装置较弱以及下部结构设计不合理，并根据原因提出了维修加固建议。最后，介绍了依托工程维修加固的原则、方法、主要内容、工艺要点及监控要点。依托工程实践表明，该桥梁主梁、桥墩的纠偏和复位工程具有工艺可靠、技术先进、施工费用低、施工工期短等优点，可在同类桥梁纠偏和复位工程中推广应用。
[Abstract]:The prestressed concrete curved box girder bridge has been widely used in highway construction in China because of its torsion, high bending stiffness, good integrity, high bearing capacity, beautiful alignment and smooth running. Compared with the commonly used linear bridges, the coupling effect of bending and torsion is obvious due to the influence of curvature. If the support setting is unreasonable, the transversal deflection and other diseases are easy to occur in practical application. Taking a prestressed concrete continuous curved box girder bridge as the research object, this paper discusses the causes of the main girder, pier deviation and support damage after the earthquake, and discusses the countermeasures for maintenance and reinforcement of the bridge. In this paper, the disease characteristics of the bridge are investigated and described in detail. According to the disease characteristics, the main causes of the bridge diseases are preliminarily identified, which provides the basis for the subsequent structural internal force analysis. Secondly, according to the main reasons of preliminary determination, the structural analysis method is used to analyze the structural dead load effect, prestress effect, concrete creep effect, temperature effect, earthquake effect of different grades and so on. The influence of different parameters on the internal force of the main beam and the constrained reaction force of the bearing is studied, which provides the necessary reference for judging the cause of the bridge disease. Thirdly, according to the results of disease detection and structural analysis, the causes of bridge damage are analyzed. It is concluded that there are three main causes of bridge damage: seismic action and internal force accumulation comprehensive effect. The support limit device is weak and the design of the substructure is unreasonable, and suggestions for maintenance and reinforcement are put forward according to the reasons. Finally, the principle, method, main content, technology and monitoring of maintenance and reinforcement of supporting engineering are introduced. Based on the engineering practice, it is shown that the rectification and restoration of the bridge main girder and pier have the advantages of reliable technology, advanced technology, low construction cost, short construction period and so on, which can be popularized and applied in the similar bridge rectification and restoration projects.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.7

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