支管軸力和彎矩聯(lián)合作用下T形圓鋼管相貫節(jié)點熱點應(yīng)力分析與計算*
姚堯1，舒興平1，袁智深1,2，盧倍嶸1,3
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（1 湖南大學土木工程學院鋼結(jié)構(gòu)研究所， 長沙 410082；2 中南林業(yè)科技大學土木工程與力學學院，長沙 410004；3 湖南科技大學土木工程學院，湘潭 411201）［摘要］支管荷載形式對節(jié)點的應(yīng)力集中系數(shù)影響很大，利用ANSYS有限元程序模擬了T形圓鋼管相貫節(jié)點在三種基本荷載（支管軸力、平面內(nèi)彎矩以及平面外彎矩）單獨作用下的熱點應(yīng)力分布曲線以及應(yīng)力集中系數(shù)，分析結(jié)果與試驗結(jié)果、文獻公式計算結(jié)果進行了對比，結(jié)果吻合良好，表明該模型較為精確地模擬了T形節(jié)點的應(yīng)力分布。進而利用該模型研究了T形圓鋼管相貫節(jié)點在基本荷載及其不同聯(lián)合荷載作用時的熱點應(yīng)力分布情況，獲得了最大熱點應(yīng)力及其分布位置，分析同時考慮了無量綱幾何參數(shù)對最大熱點應(yīng)力的影響。在API規(guī)范公式的基礎(chǔ)上，提出了計算最大熱點應(yīng)力的修正公式，按修正計算式計算得到的值與有限元分析結(jié)果吻合良好，且具有較好的適用性。［關(guān)鍵詞］T形圓鋼管相貫節(jié)點; 應(yīng)力集中系數(shù); 有限元分析中圖分類號：TU391.3，TU392.3文獻標識碼：A文章編號：1002-848X(2013)22-0026-07Hot spot stress analysis of CHS T-joint under combined loadsYao Yao1, Shu Xingping1, Yuan Zhishen1,2, Lu Beirong1,3(1 Steel Structural Institute of Civil Engineering College, Hunan University, Changsha 410082, China; 2 College of Civil Engineering and Mechanics, Central South University of Forestry and Technology, Changsha 410004, China; 3 College of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China)Abstract: Loading forms on brace have great effect on the stress concentration factor (SCF) of the joints. ANSYS program was used to simulate the stress distribution of CHS T-joint under three kinds of basic load, respectively. Hot spot stress (HSS) distribution curve and SCF were obtained. Comparisons between analysis and test, the formula of reference were made which show good agreement and confirm the accuracy of the ANSYS model. Taking the geometrical parameters into account, further analysis was made to investigate the HSS distribution of T-joint under different combinations of basic load. The maximum HSS and its location were obtained. Finally, the formula of the maximum HSS was revised based on the API code formulae. The maximum HSS calculated by the revised formula agrees with ANSYS results.Keywords: CHS T-joint; stress concentration factor; FEA*國家自然科學基金項目（50978089，50748029），湖南省自然科學基金重點項目(09JJ3102)。作者簡介：姚堯，博士研究生，Email：vincent1893@163.com。參考文獻［1］YEOH S K, SOH A K, SOH C K. Behaviour of tubular T-joint subjected to combined loadings ［J］. Journal of Constructional Steel Research, 1995, 32(1): 259-280.［2］KUANG J G, POTVIN A B, LEICK R D. Stress concentration in tubular joints ［C］//Proceedings of the 7th Annual Offshore Technology Conference. Houston, 1975: 593-612.［3］EFTHYMIOU M, DURKIN S. Stress concentrations in T/Y and gap/overlap K-joints ［C］//Proceedings of the 4th International Conference on Behaviour of Offshore Structures. Amsterdam, 1985: 429-440.［4］HELLIER A K, CONNOLLY M P, DOVER W D. Stress concentration factors for tubular Y-and T-joints［J］. International Journal of Fatigue, 1990, 12(1): 13-23.［5］HELLIER A K, CONNOLLY M P, KARE R.F, et al. Prediction of the stress distribution in tubular Y-and T-joints［J］. International Journal of Fatigue, 1990, 12(1): 25-33.［6］SMEDLEY G P, FISHER P. Stress concentration factors for simple tubular joints ［C］//1st International Offshore and Polar Engineering Conference. Edinburgh, 1991: 475-483.［7］ZHAO X L, HERION S, PACKER J A, et al. Design guide for circular and rectangular hollow section welded joints under fatigue loading, CIDECT series ‘Construction with hollow sections’ No. 8［M］.Germany: TUV-Verlag, Koln, 2001.［8］ EN 1993-1-8: 2005 Eurocode 3: Design of steel structures-Part 1-8: Design of joints［S］. Brussels: European Committee for Standardization, 2005.［9］ANSI/AISC 36-10 Specification for structural steel buildings［S］. Chicago:American Institute of Steel Construction, 2010.［10］GB 50017—2003鋼結(jié)構(gòu)設(shè)計規(guī)范［S］. 北京:中國計劃出版社，2003.［11］API RP 2A, Suppl. 3. Recommended practice for planning, designing and constructing fixed offshore platforms: Working stress design［S］. Dallas: American Petroleum Institute, 2007.［12］王新敏. ANSYS工程結(jié)構(gòu)數(shù)值分析［M］. 北京:人民交通出版社，2007: 367.
