大跨度梁桥跨中下挠问题研究

Study on Mid-span deflection of long-span beam bridge

针对悬臂工法建造的大跨度梁桥跨中过度下挠问题,从混凝土的收缩徐变、温度交变和活载疲劳、裂缝三个方面阐述了跨中下挠的机理,并提出了四种解决此问题的方法。

Aiming at the problem of excessive deflection in the midspan of long-span girder bridges constructed by cantilever construction method, there are three reasons,shrinkage and creep of concrete,temperature alternation,live load fatigue and cracks.four methods are provided.