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刚构桥是墩梁固结体系桥梁,实际施工时要先浇筑桥墩,后浇筑0号块。0号块与桥墩存在一定的龄期差。在墩梁连接处,0号块在浇筑完成后其自身的收缩徐变会受到桥墩的约束,导致在0号块底部会产生一定的拉应力。提供了一种计算由墩梁龄期差引起的0号块底部拉应力的近似方法,并根据实际工程建立有限元模型对本文方法进行了验证,分析了墩梁龄期差对0号块底部拉应力的影响。研究结果表明,墩梁龄期差越大,收缩徐变引起的0号块底部拉应力就越大,实际施工时应缩短墩梁龄期差。
Rigid-framed bridge is the bridge-girder consolidation system, the actual construction of the first pouring piers, after the pouring 0 block. Block 0 and the pier there is a certain age difference. At the junction of the pier and pier, after the completion of pouring, the No. 0 block will be restrained by the pier itself, resulting in a certain tensile stress at the bottom of the No. 0 block. An approximate method for calculating the tensile stress at the bottom of block 0 caused by the difference of pier age and beam age is provided. The method of this paper is validated according to the actual project, and the effect of pier age difference on the bottom of block 0 Tensile stress effects. The results show that the larger the beam age difference, the larger the tensile stress at the bottom of block 0 caused by shrinkage and creep, and the shortened beam age difference should be shortened in actual construction.