长期荷载作用下混凝土徐变对连续刚构桥变形的影响分析

混凝土的徐变是引起连续刚构桥长期下挠的重要原因。文中以一座连续刚构桥为例，分析了长期荷载作用下混凝土徐变对连续刚构桥变形的影响规律，并对混凝土加载龄期，以及成桥交通开放时间等参数进行了探讨。分析结果表明，混凝土徐变对桥梁结构变形的影响是一个长期、逐渐累加的过程；如果混凝土加载龄期太小，将会导致桥梁结构长期变形显著增大；推迟成桥交通开放时间可明显减小桥梁结构的长期变形。

Influence Analysis of Concrete Creep on Deformations of Continuous Rigid Frame Bridge Under Long-term Load

Concrete creep is one of the main factors of influencing long-term mid-span deflection of continuous rigid frame bridge.In this paper,taking a continuous rigid frame bridge as an example,the influence rules of concrete creep on deformations of continuous rigid frame bridge were analyzed,and the influences of the parameters such as concrete loading age and traffic opening time of bridge and so on were discussed.The analysis results showed that the influences of concrete creep on deformations of continuous rigid frame bridge will be a longer-term and gradually cumulative process and if the con-crete loading age is too short,the long-term mid-span deflection of continuous rigid frame bridge will be increased significantly.The long-term mid-span deflection will be obviously decreased by the means of putting off the traffic opening time of bridge.