钢混组合梁截面形式优化研究

Research on Optimization of Section Form of Steel Concrete Composite Beams

组合梁桥是指采用剪力连接件将抗拉性能好的钢材构件与抗压性能好的钢筋混凝土结构结合成组合截面工作的一种复合式结构。近年来,随着组合梁技术的不断发展,其使用范围已扩展到连续梁桥、拱桥和斜拉桥等多种复杂体系。组合梁中的钢梁部分也由早先单一的钢板梁拓宽到钢箱梁、钢槽梁和钢桁梁,组合梁的截面形式也由工字形发展到箱型、倒梯形甚至三角形[1]。当主梁截面采用多根单梁组成多箱室截面时,不同的截面形式造成单梁之间横向联系方式和混凝土桥面板施工方法大不相同。本文研究同等跨径、同等宽度条件下某省两条高速公路主线桥钢混组合梁截面形式由钢箱梁优化为钢槽梁后各方面性能指标,为今后的项目建设提供依据和参考.

Composite beam bridge refers to a composite structure that uses shear connectors to combine steel components with good tensile performance and reinforced concrete structures with good compressive performance into a composite section.In recent years,with the continuous development of composite beam technology,its application scope has expanded to various complex systems such as continuous beam bridges,arch bridges,and cable-stayed bridges.The steel beam section in composite beams has also expanded from a single steel plate beam to steel box beams,steel groove beams,and steel truss beams.The cross-sectional form of composite beams has also evolved from I-shaped to box shaped,trapezoidal,and even triangular[1].When the main beam section is composed of multiple single beams to form a multi box section,different section forms result in significant differences in the lateral connection between the single beams and the construction method of the concrete bridge deck.This article studies the performance indicators of the steel-concrete composite beam section of two main highways in a certain province under the same span and width conditions,which is optimized from a steel box beam to a steel trough beam,providing a basis and reference for future project construction.