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| Analysis and Discussion on Stress on End of Inserted Node Bar of Web Member of Steel Truss Girder |
| Ai Zong—Hang，YUAN Ming，DAI Sheng—yong，HU Bu—mao，TONG Deng—guo，YANG Shan—kui |
| China Railway Eryuan Engineering Group Co．Ltd，Chengdu，Sichuan 6 1003 1，China |
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Abstract Research purposes: To facilitate the manufacture and installation，the integrated node is often adopted to the large—span continuous steel truss girder bridges．The web member is connected with the node of the main truss commonly by using high—strength bolts on two friction sides．As only two sides are connected，the other sides do not directly bear the load transferred from the gusset plate，and the shear lag effect appears．In order to analyze the shear lag effect and master plate stress distribution pattern on the end of web member and guide the design，the finite element models for 80me typical cross—-sections are establish to study the stress distribution on the end of the two—sides—connected web member．
Research conclusions:The maximum normal stress on the end of truss often occurs on the end of high—strength bolts．Generally speaking，the thicker the web member is and the more the row connected by bolt along the length direction of web member is，the small the ratio between maximum normal stress and nominal normal stress is．The changes of cross—section forms and thickness will not change the area of maximum shear stresses．At middle part of web member，the normal stress goes to uniform and the shear lag effect is not obvious．
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Received: 30 October 2010
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2010, Vol. 27 
