基于实体单元的等截面宽箱梁有限元分析

Finite Element Analysis of Wide Box Girder with Constant Section based on Solid Element

目前,预应力混凝土箱梁宽跨比越来越大,依据平面杆系理论计算结果已较难体现结构空间效应。采用实体单元对3跨连续梁进行全桥精细化分析,着重考察箱梁墩顶顶板、边跨跨中底板及边支座附近应力状态,计算结果表明:梁单元和实体单元计算差异较大,实体单元模拟更接近宽箱梁实际应力状态。

At present, the width-span ratio of prestressed concrete continuous wide box girder is becoming more and more large, and it is difficult to reflect the effect of structure space based on the theory of beam element system. In this paper solid elements is used to analyze the whole structure refinement of three span continuous beam, focusing on the box girder pier roof, side span floor and side support near the stress state. The calculation results show that the there is large difference between the beam element and solid element, and the solid element is more close to the actual stress state of wide box girder.