混凝土收缩徐变引起的钢-混凝土结合梁的内力重分配  

The Stress Redistribation in Steel-concrete Composite Girders due to Shrinkage and Creep of Concrete

作　　者：周履[1] 

机构地区：[1]铁道部大桥局桥科院,湖北武汉430034

出　　处：《桥梁建设》2001年第2期1-4,共4页Bridge Construction

摘　　要：讨论并推导了由混凝土收缩徐变引起的钢 -混凝土结合梁内力重分配的计算公式 ,并提出了连续结合梁双重约束的计算方法。通过算例说明了利用调整支座高度建立的桥面混凝土预压应力的损失情况 ,最后对解决连续结合梁负弯矩区桥面开裂的措施进行了讨论。The stress redistribution in steel concrete composite girders is discussed. Caluclation formulas and method of evaluating stress redistribution in case of double restraints are devoloped. Calculation example is given to demonstrate how the previously established prestress in concrete slab is finally lost due to the long term actions of creep and shrinkage. Some measures to solve the problem of cracking of the deck plate in composite girders are briefly accounted.

关 键 词：钢混凝土结合梁 收缩 徐变 体外力筋 预应力 内力重分配 桥梁 

分 类 号：U448.216[建筑科学—桥梁与隧道工程] U441.5[交通运输工程—道路与铁道工程]