扩大截面法在刚架拱桥加固中的应用

国内许多刚架拱桥在运行期间经常发现荷载的压力线严重偏离了拱轴线,跨中实腹段主梁下缘与拱腿根部上缘分布着大量裂缝,部分裂缝超出了规范限值。结合某工程实例探讨利用扩大截面的方法对桥梁进行加固,以提高结构的受力性能和耐久性。经加固前后比较,结果表明此方法不但工艺简单、施工方便、工程造价低,而且施工完成后结构受力状况好。

Application of Extension Cross Section in Rigid-framed Arch Bridge Reinforcement

There are plenty of rigid-framed arch bridges in China has the problem of pressure seriously deviates from the arch axial line.Usually many cracks can be found in the flange of main arch ribs near the middle span and on the upper surface of the root segment of the arch leg,many of them even cannot meet the demands of the code for design.The essay below probes into the method of extension cross section to strengthen bridge in accordance with an actual example.Cooperated to the original bridge,the result shows that the method above owns many advantages,just for example,easy construction,low cost éclat the same time after reinforcement,the structure works very well.