钢-混凝土组合箱梁桥空间网格计算模型研究  

The Space Mesh Analysis Model for Steel-Concrete Composite Girder Box Bridge

作　　者：卫少阳 邬晓光[2] Wei Shaoyang;Wu Xiaoguang(School of Transportation and Surveying and Mapping Engineering,Yangling Vocational and Technical College,Yangling 712100,Shaanxi,China;Highway College,Chang'an University,Xi'an 710054,China)

机构地区：[1]杨凌职业技术学院交通与测绘工程学院,陕西杨凌712100 [2]长安大学公路学院,西安710054

出　　处：《科技通报》2024年第9期87-92,115,共7页Bulletin of Science and Technology

基　　金：陕西省交通运输厅科技项目(21-62K);杨凌职业技术学院自然科学类研究基金项目(ZK20-34);杨凌职业技术学院科技创新项目(ZK22-26)。

摘　　要：本文分析了钢-混凝土组合箱梁桥基本计算方法,指出了设计计算中应用单梁模型、梁格模型与实体模型的缺陷,详细介绍了空间网格模型的基本原理,将空间网格模型引入钢-混凝土组合箱梁计算中。为探究空间网格计算模型在钢-混凝土组合箱梁桥中的计算效率和可靠性,以一主跨480 m双塔五跨钢-混凝土组合箱梁桥为例,将主梁按照空间网格模型划分,分析成桥阶段恒载、活载以及设计标准荷载组合作用下主梁边、中跨关键截面的应力。结果表明:空间网格模型可以准确分析组合箱梁截面整体空间效应,无须单独建立局部模型就能考虑到混凝土顶板的剪力滞效应和活载局部效应,计算得出的应力结果直接用于配筋计算,为钢-混凝土组合箱梁桥分析提供新的思路和方向。The basic calculation methods of steel-concrete composite box girder bridges have been analyzed,and the shortcomings of using single beam models,beam lattice models,and solid models in design calculations have been pointed out,the basic principle of the space mesh analysis model was introduced in detail,and it was introduced into the calculation of the steel-concrete composite girder.In order to explore the computational efficiency and reliability of the space mesh analysis model in steel-concrete composite box girder bridges,taking a double tower five span steel concrete composite box girder bridge with a main span of 480 m as an example,which's main beam is divided according to the space mesh analysis model,the stress of the key sections of the main beam's edge and middle span under the dead load,the live load and the design standard load combination of the completed bridge stage is analyzed.The calculation results indicate that the space mesh analysis model can accurately analyze the structural space responses of composite box girder sections.Without establishing a separate local model,the shear lag effect and live load local effect of the concrete roof can be considered.The calculated stress results are directly used for reinforcement calculation,providing new ideas and directions for the analysis of steel-concrete composite girder box bridges.

关 键 词：钢-混凝土组合箱梁桥 空间网格模型 空间效应 配筋计算 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]