双曲拱桥加固方法的分析研究

Analysis and Study on Reinforcement Method of Double-curve Arch Bridge

以20世纪70年代建成的某双曲拱桥为工程实例,根据现状桥梁的病害特点,给出了针对该双曲拱桥加固维修的两种方法及其对应的计算结果。主要分析了两种加固方案下,主拱圈截面加强、腹拱圈内衬混凝土、换填轻质混凝土等加固措施对双曲拱桥主要构件的承载能力、裂缝、稳定性等指标的影响。通过对比得出结论:方案一通过增大拱圈截面及腹拱圈内衬钢筋混凝土,可以提高主拱圈与腹拱的承载能力,但由于加载明显导致桥墩盖梁抗剪承载力,主拱圈稳定系数不足;加固方案二通过换填拱上填料为轻质混凝土并加高桥台盖梁,加固后可以很好地满足双曲拱桥的各项力学性能,相比方案一更具有优势。

Taking a double-curve arch bridge built in 1970 s and based on the fault characteristics of present bridges, the article describes two methods of reinforcement maintenance for this double-curve arch bridge and the its corresponding calculation results. The article mainly analyzes the influence of reinforcement measures of the section strengthening of main arch ring, lining concrete of web arch ring, and replacement of light concrete under two reinforcement schemes on the indexes of carrying capacity, crack and stability of the main components of double-curve arch bridge. The compared conclusion show that Scheme I can improve the carrying capacities of main arch ring and web arch by increment of lining steel reinforced concrete of arch ring and web arch ring, but it leads to the shear bearing capacity of pier bent cap and the stable coefficient of main arch ring is not enough because of obvious loading. Scheme II is to replace the arch stuffing as the light concrete and heighten the bent cap of abutment, which can better satisfy various mechanical properties of double-curve arch bridge after reinforcement. Scheme II has more advantages after compared with Scheme I.