不锈钢焊接相贯杂交管节点静力性能研究

发布时间：2018-06-20 08:05

  本文选题：冷弯不锈钢 + 杂交管节点　； 参考：《合肥工业大学》2017年硕士论文

【摘要】：不锈钢材料由于造型优美、耐腐蚀性和耐久性能好、易于维护和全生命周期成本低等优点,越来越多地应用于建筑结构中,特别是由于不锈钢材料本身优良的耐腐蚀性和耐久性能,克服了普通碳素钢由于耐腐蚀性较差引起的耐久性问题。相贯钢管结构由于其受力性能优异、外观简洁美观、耗钢量低等特点,也在实际工程当中得到了广泛的应用。从组成节点的杆件来看,以圆管与圆管相贯或方管与方管相贯最为常见。而以方管作为主管、圆管作为支管的焊接相贯杂交管节点也表现出一些独特的优势:相对于圆管节点,不需要对支管进行复杂的空间切割;相对于方管节点,具有较少的应力集中现象和较好的疲劳性能。但是,我国目前对不锈钢相贯杂交管节点的研究十分匮乏,这一定程度上阻碍了不锈钢结构在结构工程中的应用。基于以上背景,本文对不锈钢T型、Y型和X型焊接相贯杂交管节点进行静力试验研究。主要完成以下工作:(1)对304不锈钢方管和圆管材料进行标准试件拉伸试验,研究不锈钢的力学性能,为后续的有限元分析提供材性依据。(2)对不锈钢T型、Y型和X型相贯杂交管节点共计18个构件进行节点静力试验,研究其破坏形态和极限承载力。(3)将节点承载力试验结果与各规范给出的计算公式结果进行比较,结果表明各规范结果具有较大的离散性和不准确性。(4)采用有限元分析软件ABAQUS对不锈钢T型、Y型和X型相贯杂交管节点进行了数值模拟,并将数值模拟结果与实验结果进行对比,验证了模型的准确性。并用验证了的模型对影响不锈钢相贯杂交管节点承载力的主要参数支主管径宽比β、支主管厚度比τ、主管宽厚比2γ以及支主管夹角θ进行分析研究。(5)以现有中国钢结构规范中给出的节点承载力计算公式为基础,对不发生支管局部屈曲破坏的节点提出了适用于0.25≤β≤0.8的实用计算公式,并与有限元结果进行对比,结果表明修正的实用计算公式具有较高的精确度。
[Abstract]:Stainless steel materials are more and more widely used in building structures because of their beautiful shape, good corrosion resistance and durability, easy maintenance and low life cycle cost. Especially due to the excellent corrosion resistance and durability of stainless steel, the durability of ordinary carbon steel caused by poor corrosion resistance is overcome. Intersecting steel pipe structure has been widely used in practical engineering because of its excellent mechanical properties, simple and beautiful appearance, low steel consumption and so on. From the point of view of the joint members, circular pipe and circular pipe intersecting or square pipe and square pipe intersecting is the most common. However, the welded intersected hybrid tube joints with circular tubes as branch tubes also show some unique advantages: there is no need for complex spatial cutting of branch tubes, and there is no need for complex spatial cutting of branch tubes in comparison with square tube joints. It has less stress concentration and better fatigue performance. However, the research of stainless steel intersecting hybrid tube joints is very scarce in China, which to some extent hinders the application of stainless steel structure in structural engineering. Based on the above background, the static test of stainless steel T-Y and X type welded intersected hybrid tube joints is carried out in this paper. The main work is as follows: (1) the tensile tests of the standard specimens of 304 stainless steel square tubes and circular tubes were carried out to study the mechanical properties of stainless steel. For the subsequent finite element analysis (FEA), a total of 18 members of stainless steel T-Y and X-type intersected hybrid tube joints were tested by static test. The failure mode and ultimate bearing capacity of the joints are studied. (3) the test results of the joint bearing capacity are compared with the results of the calculation formulas given in the various codes. The results show that the results of each specification have greater discreteness and inaccuracy.) numerical simulation of stainless steel T-Y and X-type intersected hybrid tube joints is carried out by using finite element analysis software Abaqus, and the numerical simulation results are compared with the experimental results. The veracity of the model is verified. The main parameters affecting the bearing capacity of stainless steel intersecting hybrid pipe joints are analyzed and studied by the model, including diameter to width ratio 尾, thickness ratio 蟿, width to thickness ratio 2 纬 and angle 胃. On the basis of the calculation formula of the bearing capacity of joints given in the structural code, A practical calculation formula suitable for 0.25 鈮，

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