用刚架拱加固改建双曲拱桥

国道上新港桥和锁苕桥为中型双曲拱桥，因设计荷载偏低经采用改变结构受力体系，将双曲拱改造为刚架拱的方法，对原桥进行了加固改建，使承载能力由汽车-10级和汽车-13级均提高到汽车-20级、挂车-100，经10余年的使用，情况良好，表明这一加固方法是可行的。文中主要介绍改造方法、加固要点及施工注意事项等。

Two-Way Curved Arch Bridge Strengthened and Reconstructed with Rigid Arch Structure

A maintenance method of two way curved arch bridge is introduced in this paper. By the method the structural system of bridge is changed by means of alteration of two way cured arch to rigid one. With this way two medium span bridges had been strengthened and reconstructed and their bearing capacity is raised to standards of Automobile-20 and Trailer-100. Two bridges worked well for more than ten years and still open to traffic. The results validate the method being reliable.