【摘要】：采用ANSYS的熱-結(jié)構(gòu)間接耦合、生死單元技術(shù)模擬Y型相貫節(jié)點的焊接過程;將牛頓-拉普森法和弧長法結(jié)合,求解Y型相貫節(jié)點極限承載力,給出求解流程;分析支管外徑與主管外徑比、支管傾角、主管徑厚比等幾何參數(shù)對Y型相貫節(jié)點極限承載力的影響,將考慮和不考慮焊接殘余應(yīng)力的計算結(jié)果進(jìn)行對比分析。研究結(jié)果表明:焊接殘余應(yīng)力降低了Y型相貫節(jié)點的極限承載力;支管外徑與主管外徑比β越大,主管的徑厚比γ越小,支管傾角θ越小,則Y型相貫節(jié)點極限承載力降低越多;結(jié)構(gòu)設(shè)計時,保證強(qiáng)度和安全的前提下選擇合適的支管外徑、主管壁厚和支管傾角,可減小焊接殘余應(yīng)力對Y型相貫節(jié)點極限承載力的影響。
[Abstract]:The welding process of Y-type intersecting joints is simulated by using ANSYS's thermo-structural indirect coupling technique, and the ultimate bearing capacity of Y-type intersecting joints is solved by combining Newton-Raphson method with arc length method, and the flow chart is given. The effects of geometric parameters such as the ratio of branch diameter to superintendent diameter, branch dipping angle and director-diameter thickness ratio on the ultimate bearing capacity of Y-type intersecting joints are analyzed. The calculated results of considering and disregarding the welding residual stress are compared and analyzed. The results show that the welding residual stress reduces the ultimate bearing capacity of Y-joints. The bigger the ratio of branch diameter to top diameter is, the smaller the diameter to thickness ratio of branch pipe is, and the smaller the inclination angle of branch pipe is, the more the ultimate bearing capacity of Y-type intersecting joints is reduced. In structural design, the influence of welding residual stress on ultimate bearing capacity of Y-joint can be reduced by selecting proper branch diameter, wall thickness and inclination angle of branch pipe on the premise of strength and safety.
【作者單位】： 清華大學(xué)土木工程系;天津城建大學(xué)天津市土木建筑結(jié)構(gòu)防護(hù)與加固重點實驗室;
【基金】：國家自然科學(xué)基金青年科學(xué)基金項目(11304168) 清華大學(xué)自主科研項目(2012Z10134)
【分類號】：TU392.3
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本文編號：2326309