收缩徐变对中承式系杆拱桥拱肋力学性能影响分析

Analysis of Influence of Shrinkage and Creepage on the Mechanical Properties of the Arch Ribs of a Half-through Tied Arch Bridge

为研究中承式系杆拱桥在成桥后不同龄期内,混凝土收缩徐变对拱肋各控制截面内力、变形和应力的影响,以黎明大桥为例,通过Midas Civil有限元软件建立桥梁模型,分析不同龄期下拱肋内力、变形和应力。研究结果表明:随着龄期逐渐增大,各控制截面内力和变形的变化幅度相比于应力变化幅度较大,成桥后龄期两年及以上混凝土收缩徐变对拱肋产生的影响逐渐趋于平稳,并随计算时间终止而终止。

In order to study the influence of concrete shrinkage and creepage on the internal force,deformation,and stress of each control section of the arch rib of a half-through tied arch bridge at different ages after completion,taking the Liming bridge as an example,a bridge model is established by using Midas Civil finite element software to analyze the internal force,deformation,and stress of the arch rib at different ages.The research results show that:as the age gradually increases,the changes in the internal force and deformation of each control section are greater than that in the stress.After the bridge is completed,the influence of concrete shrinkage and creepage on the arch ribs gradually stabilizes and ends with the termination of calculation time.