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预应力混凝土连续梁桥的次内力,一般包括:预加力引起的次内力、混凝土收缩徐变引起的次内力、基础沉陷引起的次内力和由非线性温度梯度引起的次内力。文中先介绍了各项次内力产生的机理及对连续梁桥的影响,再以一座3跨悬臂浇注施工的预应力混凝土连续箱桥为工程实例,进行详细说明。
The secondary internal forces of prestressed concrete continuous girder bridges generally include secondary internal force caused by pre-stress, secondary internal force caused by shrinkage and creep of concrete, secondary internal force caused by foundation subsidence and secondary internal force caused by non-linear temperature gradient. In this paper, the mechanism of secondary internal force generation and its influence on continuous girder bridge are firstly introduced. Then a prestressed concrete continuous box girder bridge constructed by 3-span cantilever casting is taken as an example to explain in detail.