多种加固方法应用于双曲拱桥主拱圈的提载加固

针对双曲拱桥的提载加固,基于贵州省安顺市木浪河大桥的检测结果,提出了在主拱圈的拱脚上缘增大截面、下缘增大截面改造为箱形断面,以提高拱脚抵抗负弯矩、正弯矩的承载能力;对其它截面采用拱背增大截面以提高抵抗负弯矩的承载能力,相应也提高了抵抗正弯矩的承载能力;对正弯矩承载能力不足的截面,采用粘贴钢板的加固方法。结果表明:采用这种提载加固的设计方法,达到了提高荷载等级的目的,同时方便施工,便于达到加固效果。

Reinforcement for Improving Bearing Capacity of A Double Arch Bridge Main Arch by Strengthen Methods

In this paper,reinforcement for improving the bearing capacity of a double arch bridge is studied.Based on the test results of a double-arched bridge of Anshun in Guizhou province,the strengthening program of the main arch is proposed.At the section of arch feet,the moment bearing capacity is improved by enlarged upper edge concrete and lower edge concrete of the section,the section is changed to box section.At the other section of the arch,the negative moment bearing capacity is improved by enlarged upper edge concrete of the section,and the positive moment bearing capacity is improved.For the deficiencies of the positive moment bearing capacity,the bonding steel plate is recommended at the arch rib of the other section.The results show that the reinforcement methods can improve load level of the bridge effectively.The construction of the bridge is convenient and can satisfy the design goals.