跨线钢箱梁桥顶推落梁过程的数值模拟

Numerical simulation of pushing and falling process of over-line steel box girder bridge

为了研究钢箱梁在高位落梁过程中的受力性能以及局部屈曲性能,以后丁香三号桥为工程背景,提出了一种新的交替式高位落梁工艺.基于ABAQUS有限元软件对落梁过程进行了数值模拟,建立了高位落梁过程三个工况的有限元模型,使用集中荷载模拟千斤顶对梁体的支反力.对三个工况的应力云图和屈曲模态进行分析,结果表明,模拟数据与监测数据吻合较好,结构的应力应变均能满足施工要求.本文提出的高位落梁工艺和数值模拟方法可为类似工程提供参考.

In order to study the mechanical behavior and local buckling behavior of steel box girder in the process of high-level falling beam, the Hou Dingxiang NO. 3 bridge was taken as the engineering background, and a new alternating high-level falling beam technology was proposed. The beam falling process was numerically simulated with the finite element software ABAQUS, the finite element model for three operating conditions of high-level falling beam process was established, and the supporting counterforce of the jack on the beam was simulated with the concentrated load. In addition, the stress nephogram and buckling mode under three operating conditions were analyzed. The results show that the simulated data are in good agreement with the monitored data, and the stress and strain of the structure can meet the construction requirements. The proposed high-level falling beam technology and numerical simulation method can provide the references for the similar projects.