空間網(wǎng)殼相貫節(jié)點受力性能有限元分析*
王萌1，石永久2，王元清2，施剛2，賀小平3
- 摘 要
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（1 北京交通大學土木建筑工程學院， 北京 100044； 2 清華大學土木工程系， 北京 100084；3 晶藝玻璃工程有限公司， 珠海 519015）［摘要］為研究空間網(wǎng)殼相貫節(jié)點的受力性能，采用有限元軟件ABAQUS建立非線性桿系、實體有限元模型，深入探討了圓筒相貫、直接相貫兩種不同相貫形式節(jié)點在軸力、彎矩、剪力復合作用下的復雜應力、變形分布以及應力集中現(xiàn)象；利用兩種不同方式，對節(jié)點域初始剛度進行評價；計算了節(jié)點的承載能力以及安全儲備，并探討了改進節(jié)點性能的設(shè)計方法。有限元分析結(jié)果表明：兩種連接形式在應力、變形、承載力等方面基本一致，極限荷載約為設(shè)計荷載的2.04倍，具有較大的安全儲備；圓筒相貫節(jié)點應力集中現(xiàn)象較直接相貫節(jié)點有一定緩解，應力集中現(xiàn)象可能會導致局部屈服，存在安全隱患，可通過加厚相貫區(qū)域、在此區(qū)域進行倒角處理等措施予以解決；圓筒相貫節(jié)點比直接相貫節(jié)點剛度大，直接與圓筒相連的桿件比既與圓筒相連又與旁邊桿件相連的節(jié)點剛度大，根據(jù)歐洲規(guī)范的分類方法以及與桿系模型對比分析，兩種形式節(jié)點在工程中可以視為剛性連接。［關(guān)鍵詞］空間網(wǎng)殼; 相貫節(jié)點; 有限元分析; 承載力; 初始剛度中圖分類號：TU391 文獻標識碼：A 文章編號：1002-848X(2013)21-0009-05Finite element analysis on behavior of spatial latticed mutually intersecting connectionsWang Meng1, Shi Yongjiu2, Wang Yuanqing2, Shi Gang2, He Xiaoping3(1 School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 2 Department of Civil Engineering, Tsinghua University, Beijing 100084, China; 3 Crystal Art Glass Engineering Co., Ltd., Zhuhai 519015, China)Abstract: In order to study the behavior of spatial latticed mutually intersecting connections, beam element model and solid finite element model of ABAQUS were adopted.The stress,deformation distribution and the stress concentration phenomenon were discussed for both the cylindrical intersecting connection and directly intersecting connection under the axis force, bending moment and shear force; two different ways were used to evaluate the initial stiffness of the connection region; the capacity and safety reserves were calculated and the method to improve performance of the connections was discussed. The results show that: two kinds of connections basically have the same distribution of the stress, deformation, bearing capacity etc.; the limited load is about 2.04 times of the design load with greater security reserve. Stress concentration phenomenon of cylindrical intersecting connection is less than the directly intersecting one. The stress concentration phenomenon may cause local yields which leads to potential safety hazard. This problem can be solved by thickening intersection region or chamfering processing. The initial stiffness of cylindrical intersecting connection is larger than the directly intersecting one and the stiffness of the one directly connected to the cylinder is larger than the one connected to both cylinder and adjacent beams. According to both the European standard classification method and the comparative analysis of the beam element model, two types of connections can be regarded as rigid connections in engineering.Keywords: spatial latticed shell; intersecting connection; finite element analysis; bearing capacity; initial stiffness*國家自然科學基金 (51038006)。作者簡介：王萌，博士后，Email:wangmeng1117@gmail.com。參考文獻［1］王洪軍, 張安安, 張皓涵, 等. 世博軸陽光谷單層網(wǎng)殼鋼節(jié)點承載性能研究［J］. 施工技術(shù), 2009, 38(8):31-38.［2］宛高旗, 薛玉, 賀偉. 鋼管相貫節(jié)點剛度的研究與發(fā)展［J］. 陜西建筑, 2008(155):17-19.［3］王傳甲, 陳察, 閻曉銘, 等. 空中華西村復雜超限高層結(jié)構(gòu)設(shè)計［J］. 建筑結(jié)構(gòu), 2008, 38(8): 8-13.［4］王元清, 石永久, 祝磊, 等. 方管圓管混合空間鋼管節(jié)點承載性能的非線性分析［J］. 建筑結(jié)構(gòu)學報, 2004, 25(4): 72-75.［5］邱國志, 趙金城. 相貫節(jié)點剛度對某單層網(wǎng)殼結(jié)構(gòu)整體穩(wěn)定性的影響［J］.建筑結(jié)構(gòu),2010,40(3):97-99.［6］石永久, 王萌, 王元清, 等. 鋼框架改進型梁柱節(jié)點滯回性能有限元分析［J］. 沈陽建筑大學學報：自然科學版, 2010, 26(2): 205-210.［7］BENALLAL A, BILLARDON R, DOGHRI I. An integration algorithm and the corresponding consistent tangent operator for fully coupled elastoplastic and damage equations［J］. Communications in Applied Numerical Methods, 1998, 4(6):731-740.［8］DODGE W G, MOORE S E. Stress indices and flexibility factors for moment loadings on elbows and curved pipes［J］. Welding Research Council Bulletin, 1972（179）:1-8.［9］馬洪濤, 孫亞龍, 顧建, 等. 南通市體育會展中心鑄鋼節(jié)點模型的非線性有限元分析［J］. 建筑鋼結(jié)構(gòu)進展, 2007, 9(2):38-42.［10］羅旭斌, 馬軍. 鑄鋼支座節(jié)點極限承載力的非線性有限元分析［J］. 空間結(jié)構(gòu), 2006, 12(3): 56-60.［11］British Standards Institution. BS EN 1993-1. Eurocode: Design of steel structure: Part 1-8: Design of joint［S］. London, BSI, 2005.［12］卞若寧, 陳以一. 非貫通式鑄鋼節(jié)點應力分析和設(shè)計原則［J］. 建筑結(jié)構(gòu), 2004, 34(11): 34-36.［13］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.
