基于FEA全桥模型的预制小箱梁隐盖梁受力分析研究

摘要:

本文结合工程实际，提出采用数值分析的方法研究了隐盖梁受力特点，在同类工程中具有借鉴意义。通过Midas Civil梁单元模型和Midas FEA全桥实体单元模型进行对比分析，可得到以下结论：（1）采用FEA整体建模能有效模拟隐盖梁受力情况。（2）小箱梁与隐盖梁交界处存在应力集中，导致主拉应力较大，设计时应保证小箱梁纵向钢筋的完整并减少隐盖梁预应力开槽对结构的削弱。（3）由于边墩隐盖梁嵌固效应，导致边跨跨中正弯矩减小，设计中可适当减小边跨小箱梁预应力筋。

Abstract:

In this paper, combined with the engineering practice, the numerical analysis method is proposed to study the mechanical characteristics of the hidden cover beam, which has reference significance in similar projects. Through the comparative analysis of the Midas Civil beam element model and the Midas FEA full bridge solid element model, the following conclusions can be drawn: (1) The overall modeling of FEA can effectively simulate the stress situation of the cover beam. (2) There is a stress concentration at the junction of the small box girder and the hidden cover beam, resulting in a large main tensile stress. The design should ensure the integrity of the longitudinal reinforcement of the small box beam and reduce the weakening of the structure by the prestressed slotting of the hidden cover beam. (3) Due to the embedded effect of the side pier hidden cover beam, the positive bending moment of the side span is reduced, and the prestressed tendons of the side span small box beam can be appropriately reduced in the design.