体外预应力加固大跨度连续刚构桥性能分析

ANALYSIS OF THE PERFORMANCE OF LARGE SPAN CONTINYOUS RIGID FRAME BRIDGES WITH EXTERNAL PRESTRESSING

为研究体外预应力加固混凝土连续刚构桥的力学性能,以跨径为(75+3×130+75m)的连续刚构箱梁桥作为工程背景,采用Midas/Civil有限元软件建立计算结构模型,通过加固前后荷载试验数据对比分析得出,承载能力提高7.6%,挠度值下降35.1%,应力值下降30.3%。结果表明,体外预应力加固连续刚构箱梁桥可以有效地提高结构的极限承载能力,提高整体刚度,改善结构受力状态,为进一步研究体外预应力加固混凝土结构设计提供理论分析的参考依据。

In order to study the mechanical properties of reinforced Concrete Continuous Rigid Frame Bridge Strengthened with external prestressing force,With a span of 75 meters plus 3 times130 meters plus 75 meters of continuous rigid structure box girder bridge as the engineering background,using Midas/Civil finite element software to establish the computational structure model,Through the contrast analysis of loading test data before and after strengthening,the load capacity increased by 7.6%,deflection value decreased by 35.1%,and stress value decreased by 30.3%.The results show that the strengthening of the continuous rigid frame box girder bridge with external prestress can effectively improve the ultimate bearing capacity of the structure,improve the overall stiffness and improve the stress state of the structure,Which provides a theoretical basis for further research on the design of concrete structures strengthened with external prestressing force.