基于Midas刚接空心板简支梁桥分析
Analysis of Midas-Based Simply Supported Girder Bridge with Rigid Jointed Hollow Plate

空心板桥是小跨径钢筋混凝土桥梁中常见的桥型，具有高度小、外形美观、施工便捷等优点，但在设计时需考虑其受力特点和材料特性。本文结合预应力钢筋混凝土体系，利用Midas Civil软件对空心板桥进行有限元建模，首先分析钢绞线在传力锚固前后的预应力损失，然后分析其在正常使用极限状态和承载能力极限状态下的受力表现。研究结果表明，有限元计算结果与理论计算结果相差不大，空心板桥的弯矩分布合理，顶、底缘拉应力均满足规范要求，梁在安装阶段及长期使用中的变形均符合设计标准。
The hollow slab bridge is a common type of small-span reinforced concrete bridge, characterized by its low height, aesthetic appearance, and convenient construction. However, its design must consider its mechanical characteristics and material properties. This paper integrates the prestressed reinforced concrete system and utilizes Midas Civil software to create a finite element model of the hollow slab bridge. The analysis first examines the prestress loss in steel strands before and after force-transfer anchoring, followed by an evaluation of its mechanical performance under the serviceability limit state and the ultimate limit state. The research results indicate that the finite element calculations align closely with theoretical computations. The bending moment distribution of the hollow slab bridge is reasonable, with the tensile stresses at the top and bottom edges meeting code requirements. Additionally, the deformations of the beam during both the installation phase and long-term use comply with design standards.