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超宽组合梁剪力滞效应分析

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超宽组合梁宽高比很大,在弯矩作用下超宽组合梁的力学特性与普通梁较为不同,目前相关技术规范尚缺乏关于超宽梁有效宽度的系统化公式.为了深入分析在弯矩作用下超宽组合梁剪力滞效应引起的正应力分布不均的特征,以深汕大桥为工程背景,利用ABAQUS有限元软件建立跨中15 道中横梁梁段52.5m空间壳单元有限元简支梁体系模型和采用Midas civil建立空间杆系单元全桥模型,分析在自重、车道荷载、人群荷载和吊杆杆力作用下跨中截面顶、底板和1/4 跨截面顶板的正应力和剪力滞系数的分布规律.分析结果表明,超宽组合梁在荷载作用下,结构受力存在明显的剪力滞效应,目前相关技术规范关于翼缘有效宽度计算公式的安全系数比实际高1.21~1.63 倍.
Analysis on Shear Lag Effect of Super Wide Composite Beam
The ratio of width to height of super wide composite beams is very large.The mechanical properties of super wide composite beams under bending moment are different from those of ordinary beams.Up to now,there is no systematic formula for the effective width of super wide beams in the specifications.In order to further study the characteristics of uneven distribution of normal stress caused by shear lag effect of superwide composite beam under bending moment,taking Shenshan Bridge as the engineering background,ABAQUS finite element software has been used to establish a 52.5 m space shell element finite element simply supported beam system model of 15 mid-span cross beam sections and a space bar element full bridge model by Midas civil.The distribution of normal stress and shear lag coefficient of the roof,floor and 1/4 cross-section roof of the mid-span section under the action of dead weight,lane load,crowd load and suspender force have been studied.The results have shown that there is obvious shear lag effect in the structure of super wide composite beams under load.At present,the safety factor of the effective width calculation formula in the specifications is 1.21~1.63 times higher than the actual one.

super wide composite box girdershear lag effectshenshan bridgeABAQUSeffective width

周海俊、郭以静

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深圳大学土木与交通工程学院,广东 深圳 518060

超宽组合梁 剪力滞效应 深汕大桥 ABAQUS 有效宽度

深圳市高等院校稳定支持计划项目

20220811152251005

2024

广东公路交通
广东省交通科技有限公司

广东公路交通

影响因子:0.311
ISSN:1671-7619
年,卷(期):2024.50(1)
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