本文選題：冷彎不銹鋼 + 雜交管節(jié)點　； 參考：《合肥工業(yè)大學》2017年碩士論文

【摘要】：不銹鋼材料由于造型優(yōu)美、耐腐蝕性和耐久性能好、易于維護和全生命周期成本低等優(yōu)點,越來越多地應用于建筑結(jié)構(gòu)中,特別是由于不銹鋼材料本身優(yōu)良的耐腐蝕性和耐久性能,克服了普通碳素鋼由于耐腐蝕性較差引起的耐久性問題。相貫鋼管結(jié)構(gòu)由于其受力性能優(yōu)異、外觀簡潔美觀、耗鋼量低等特點,也在實際工程當中得到了廣泛的應用。從組成節(jié)點的桿件來看,以圓管與圓管相貫或方管與方管相貫最為常見。而以方管作為主管、圓管作為支管的焊接相貫雜交管節(jié)點也表現(xiàn)出一些獨特的優(yōu)勢:相對于圓管節(jié)點,不需要對支管進行復雜的空間切割;相對于方管節(jié)點,具有較少的應力集中現(xiàn)象和較好的疲勞性能。但是,我國目前對不銹鋼相貫雜交管節(jié)點的研究十分匱乏,這一定程度上阻礙了不銹鋼結(jié)構(gòu)在結(jié)構(gòu)工程中的應用。基于以上背景,本文對不銹鋼T型、Y型和X型焊接相貫雜交管節(jié)點進行靜力試驗研究。主要完成以下工作:(1)對304不銹鋼方管和圓管材料進行標準試件拉伸試驗,研究不銹鋼的力學性能,為后續(xù)的有限元分析提供材性依據(jù)。(2)對不銹鋼T型、Y型和X型相貫雜交管節(jié)點共計18個構(gòu)件進行節(jié)點靜力試驗,研究其破壞形態(tài)和極限承載力。(3)將節(jié)點承載力試驗結(jié)果與各規(guī)范給出的計算公式結(jié)果進行比較,結(jié)果表明各規(guī)范結(jié)果具有較大的離散性和不準確性。(4)采用有限元分析軟件ABAQUS對不銹鋼T型、Y型和X型相貫雜交管節(jié)點進行了數(shù)值模擬,并將數(shù)值模擬結(jié)果與實驗結(jié)果進行對比,驗證了模型的準確性。并用驗證了的模型對影響不銹鋼相貫雜交管節(jié)點承載力的主要參數(shù)支主管徑寬比β、支主管厚度比τ、主管寬厚比2γ以及支主管夾角θ進行分析研究。(5)以現(xiàn)有中國鋼結(jié)構(gòu)規(guī)范中給出的節(jié)點承載力計算公式為基礎,對不發(fā)生支管局部屈曲破壞的節(jié)點提出了適用于0.25≤β≤0.8的實用計算公式,并與有限元結(jié)果進行對比,結(jié)果表明修正的實用計算公式具有較高的精確度。
[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 緯 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，

本文編號：2043590