基于有限元的钢混组合梁施工阶段局部剪力钉受力性能分析
Mechanical Behavior Analysis of Local Shear Nails in Construction Stage of Steel-concrete Composite Beams Based on Finite Element Method
张剑飞 1栗明亮 2费来明 1梁斌2
作者信息
- 1. 中交二公局第四工程有限公司,河南 洛阳 471000
- 2. 河南科技大学 土木建筑学院,河南 洛阳 471000
- 折叠
摘要
为了解钢混组合梁施工阶段的受力性能,以沁河特大桥主桥为工程背景,采用Midas Civil软件建立主桥模型,对完整施工阶段进行模拟,分析全过程结构内力,进而确定组合梁受力最不利工况;采用Abaqus软件对组合梁进行局部精细化模型建立,分析钢混界面处剪力钉在最不利工况下的受力性能.结果表明:边跨(第一跨、第五跨)存在最大正弯矩,在二期铺装阶段完成后第五跨跨中正弯矩达到139 488 kN·m,2-3 跨合龙后,第一跨跨中正弯矩达到 117 502 kN·m;应力在梁截面横向分配不均匀,二期铺装阶段剪力钉出现最大剪力 43.8 kN,小于容许值 50.1 kN,在施工阶段组合梁钢混界面剪力钉受力安全.
Abstract
In order to understand the mechanical performance of steel-concrete composite beams during construc-tion,the main bridge of Qinhe River Bridge is studied.Midas Civil software is used to build the main bridge mod-el,simulate the complete construction stage,analyze the whole process of structural internal forces,and then de-termine the most unfavorable stress conditions of composite beams.Then Abaqus software is used to establish a local fine model of the composite beam,and the mechanical performance of the shear nails at the steel-concrete interface under the most unfavorable conditions is analyzed.The results show that the side span(the first span and the fifth span)has the largest positive bending moment.The positive bending moment of the fifth span rea-ches 139 488kN·m after the completion of the second stage of pavement,and the positive bending moment of the first span reaches 117 502kN·m after the closing of the 2-3 span.The transverse distribution of stress in the beam section is not even.The maximum shear force of shear nails in the second stage of pavement is 43.8kN,which is less than the allowable value of 50.1kN,in the construction stage,the composite beam steel-concrete in-terface shear nails are stressed safely.
关键词
钢混组合梁/施工阶段/剪力钉/局部精细化模型/力学性能Key words
steel-concrete composite beam/construction phase/shear nails/girder segment refined model/me-chanical properties引用本文复制引用
基金项目
国家自然科学基金(U1604135)
中铁第二公路局有限公司重点科研项目(2022X-2-7)
河南省科技厅产学研合作项目(2015HNCXY011)
出版年
2024
NETL
NSTL
万方数据