扁平钢箱梁剪力滞效应分析

发布时间：2018-01-03 18:32

本文关键词：扁平钢箱梁剪力滞效应分析　出处：《交通运输工程学报》2014年04期 　论文类型：期刊论文

【摘要】：利用有限元法研究了扁平钢箱梁在集中荷载和均布荷栽作用下的剪力滞效应。结合扁平钢箱梁设计参数的合理取值范围,分析了截面宽度和高度、顶板和底板厚度、纵隔板与横隔板的厚度和间距等参数对剪力滞效应的影响。根据理论分析结果,应用回归分析法提出了扁平钢箱梁剪力滞系数的实用计算公式,并将计算结果与有限元分析结果进行对比分析。分析结果表明:跨宽比对剪力滞系数影响最显著,当跨宽比由1.786增大至8.926时,顶板与底板处的最大剪力滞系数分别由1.40、1.32减小为1.07、1.06,减少约20%;当纵隔板厚度由10 mm增大至30 mm时,剪力滞系数在边腹板处减小约7%,而在其他位置变化小于1%;纵隔板间距与梁宽比由0.430增大至0.582时,剪力滞系数增大约9%;其他参数变化对剪力滞系数的影响均可忽略。实用计算公式的计算结果与有限元分析结果的相对误差小于1%,说明公式计算精度较高,满足工程计算要求。
[Abstract]:By using the finite element method to study the shear lag effect of flat steel box girder under concentrated loads and were subsequently planted under the action. The reasonable range of the design parameters of flat steel box girder, analyses the section width and height, top and bottom plate thickness, plate and the effects of mediastinal diaphragm thickness and spacing on the shear lag effect on the results. The theoretical analysis and practical analysis method of flat steel box girder shear lag coefficient calculation formula by regression, and the calculated results with the finite element analysis results were compared and analyzed. Analysis results show that the most significant span width ratio of shear lag effect, when the span width ratio increases from 1.786 to 8.926, the maximum shear lag coefficient and roof at the bottom are reduced from 1.40,1.32 to 1.07,1.06, decreased by about 20%; when the longitudinal clapboard thickness increased from 10 mm to 30 mm, the shear lag coefficient decreases about 7% at the edge of the web, and in other locations Change is less than 1%; mediastinal plate spacing and Liang Kuan ratio increased from 0.430 to 0.582, the shear lag coefficient increases about 9%; all other parameters change on the shear lag coefficient is ignored. The results of practical calculation formula and finite element analysis of the results of the relative error is less than 1%, indicating high calculation precision, satisfies the requirement of engineering calculation.

【作者单位】：长安大学建筑工程学院;长安大学公路学院;重庆大学土木工程学院;
【基金】：国家自然科学基金项目(50608005,51308053) 中央高校基本科研业务费专项资金项目(CHD2011JC070)
【分类号】：U448.213;U441
【正文快照】： ^ 影响远大于腹板加劲助[5];欧阳永金通过建立空间51 S 板壳有限元模型研究了大宽跨比多室钢箱梁的剪力按照初等梁的弯曲理论,承受弯矩作用的主梁在滞效应,结果表明该类钢箱梁剪力滞效应显著,且各距离中性轴等高度处的正应力是均匀分布的,然而在箱室剪力滞系数不同,而考虑桥

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