基于应变斜面斜率的圬工拱桥加固后组合截面承载力计算方法

针对圬工拱桥通过增大截面法、套箍法等加固后组合截面承载力计算问题。在考虑原结构初始应力及材料非线性的基础上,从轴力及弯矩与应变斜面斜率的关系出发,分析了组合截面抗拉极限状态及抗压极限状态下的承载力,提出了存在二次受力的组合截面承载力计算方法;并以上、下缘均加固的矩形组合截面为例,推导了计算公式。通过工程实例进行了验证,结果表明方法可行。

Study on Strain Bevel Slope of Co-Section for Bearing Capacity of the Strengthened Masonry Arch Bridges

In view of the problems existed in the bearing capacity calculation of co-section of masonry arch bridges strengthened by enlarging section area method and hoop method, this paper based on the material nonlinearity and initial stress of the original structure, and considered about the relationship between axial force and bending moment, strain bevel slope, analyzed the bearing capacity of co-section under the limit state, and put forward the bearing capacity calculation method of co-section which exits secondary load. Moreover, cited an example about a strengthened rectangular section, and deduced the calculation formula, which was verified by an engineering example, the results showed that the calculation method is feasible.