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我国自六十年代以来,修建了不少大跨径预应力混凝土桥梁,其中以铰接或带挂梁的T型刚构占多数。这种桥型的优点是便于悬臂施工,施工阶段和运营阶段受力一致,预应力工艺简单。但存在悬臂端挠度大、伸缩缝多、徐变变形大导致桥面呈凹折形的缺点,因而影响使用和养护。随着我国“四化”建设的发展和新技术、新材料的出现,大大促进了桥梁技术发展。电子计算机的应用,使设计手段日臻完善。近年来我国修建
Since the 1960s, many long-span prestressed concrete bridges have been constructed in our country, of which T-type rigid structures are most of them hinged or linked with beams. The advantages of this type of bridge is easy to cantilever construction, construction and operation phase of the same force, prestressing process is simple. But there is a large deflection of the cantilever side, expansion joints and more, creeping deformity caused by the bridge was concave-shaped shortcomings, thus affecting the use and conservation. With the development of “four modernizations” in our country and the advent of new technologies and materials, the development of bridge technology has been greatly promoted. The application of electronic computer, make the design method perfect day by day. In recent years, China built