空间倒三角形管桁架组合梁有限元分析及设计参数研究

发布时间：2018-03-24 13:53

本文选题：倒三角形管桁架　切入点：组合梁　出处：《中外公路》2015年06期

【摘要】：为研究设计参数对空间三角形管桁架组合梁受力性能的影响,依据管桁架组合结构试验模型参数,应用非线性有限元软件Abaqus建立组合梁的有限元模型,其计算结果与试验结果吻合较好;利用有限元方法,以混凝土板的材料等级、板宽及板厚、弦杆的材料等级、壁厚以及桁架节间宽高比、倾斜桁架间夹角等为参数对其极限承载力的影响进行了分析。结果表明:混凝土强度、板宽、板厚增加66.7%、66.7%、100%,其极限承载力则相应提高了5.6%、1.5%、16.2%;当弦杆采用Q345B、Q390B级钢时,其极限承载力相对于采用Q235B级钢增加了17.8%、18.6%,下弦管壁厚增加50%时,其极限承载力提高6.1%;当倾斜桁架节间宽高比接近于1时,其极限承载力最高,而两倾斜桁架间的夹角大小对极限承载力基本无影响。
[Abstract]:In order to study the influence of design parameters on the mechanical behavior of space triangular tubular truss composite beam, the finite element model of composite beam is established by using nonlinear finite element software Abaqus according to the experimental model parameters of pipe truss composite structure. The calculated results are in good agreement with the test results, and the material grade, width and thickness of concrete slab, the material grade of chord, the wall thickness and the ratio of width to height of truss joints are used in finite element method. The influence of angle between inclined truss and other parameters on ultimate bearing capacity is analyzed. The results show that the strength, width and thickness of concrete are increased by 66.7% and 66.7%, and the ultimate bearing capacity is increased by 5.645 B and 1.5% 16.2. When the chord adopts Q345Band Q390B grade steel, Compared with the Q235B grade steel, the ultimate bearing capacity of the steel increases by 17.818.6, and the ultimate bearing capacity increases by 6.1 when the thickness of the lower chord wall increases by 50, and the ultimate bearing capacity of the inclined truss is the highest when the ratio of width to height of the inclined truss is close to 1. However, the angle between the two inclined trusses has no effect on the ultimate bearing capacity.
【作者单位】：苏州科技学院土木工程学院;江苏省结构工程重点实验室;
【基金】：苏州市市级建设科研项目(编号:2014-1-12)
【分类号】：TU398

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