考虑弯、剪相关性的RC梁桥承载力可靠度评估

Reliability evaluation of the bearing capacity of RC girder bridges considering flexural shear correlation

进行了12片PC箱梁静力加载试验,并整理了已有的混凝土梁弯剪受力的试验数据。基于弯剪承载力抛物线计算模型,修正规范《公路钢筋混凝土及预应力混凝土桥涵设计规范(JTG D62-2018)》中的承载力计算方法。通过实例,分别基于修正的计算公式和规范中的计算公式对主梁承载力的可靠度进行了校核。研究结果表明:进行钢筋混凝土梁桥主梁截面设计时,应考虑弯、剪相关性对承载力计算公式的影响。

The static loading test of 12 PC box girders is carried out, and the existing test data of the flexural and shear stress of concrete beams are sorted out. Based on the parabolic calculation model of the flexural and shear capacity, the calculation method of the bearing capacity in the corresponding specification is modified. Based on the modified formula and code(JTG D62—2018 "code for design of highway reinforced concrete and prestressed concrete bridge and culvert"), the reliability of the bearing capacity of the main girder is checked by an example. The results show that the influence of flexural shear correlation on the calculation formula of standard bearing capacity should be taken into account in the section design of Reinforced Concrete Girder Bridge.