预应力混凝土变截面连续箱梁桥静载试验研究

Study on Static Load Test of Prestressed Concrete Variable-section Continuous Box Girder Bridge

摘要:

为准确评估预应力混凝土变截面连续箱梁成桥时的承载能力及工作状态，检验桥梁结构是否达到设计及有关规范规定的要求，为桥梁交工验收提供技术依据。以某预应力混凝土变截面连续箱梁为研究对象，采用软件MIDAS Civil建立有限元分析模型，详细介绍了静载试验检测的主要试验工况及测试内容，对比分析了主梁应变、挠度等静载理论计算值与实测数据。结果表明：静力荷载作用下，该桥应变、挠度校验系数均在规定的合理范围内；应变、挠度残余均小于20%。该桥整体处于弹性工作状态，受力状态良好，满足设计荷载及有关规范的使用要求。准确评估结构成桥时的整体承载性能及实际工作状态，检验桥梁结构是否达到设计及有关规范规定的要求，为类似交工验收中桥梁承载能力评定提供参考。

Abstract:

In order to accurately assess the bearing capacity and working state of prestressed concrete variable-section continuous box girder bridge, it is to check whether the bridge structure meets the requirements of the design and relevant codes, which provides a technical basis for the delivery and acceptance of bridges. Taking a prestressed concrete variable-section continuous box girder as the research object, the software MIDAS Civil is used to establish a finite element analysis model. The main test conditions and test contents of the static load test inspection are introduced in detail. The theoretical calculated values of static loads of main girder strains and deflections are analyzed and compared with the measured data. The results show that under the static load, the strain and deflection calibration coefficients of the bridge are all within the specified reasonable range. And the strain and deflection residuals are all less than 20%. The whole bridge is in elastic working state and in good stress state, which meets the design load and the use requirements of relevant codes. The overall carrying performance and the practical working state of the bridge during its completion are accurately evaluated. It is to check whether the bridge structure meets the requirements of the design and relevant codes, which provides a reference for the evaluation of the bearing capacity of bridges in the delivery and acceptance of similar bridges.