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DIRECT STRENGTH METHOD OF WELDED BOX-SECTION FOR PREDICTING ULTIMATE LOAD-CARRYING CAPACITY
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摘要: 现行GB 500172003《钢结构设计规范》对焊接箱形截面构件在考虑壁板局部失稳后的稳定极限承载力的设计规定还相当粗糙,按腹板高度边缘范围内两侧宽度各为20tw计算有效面积,未能与构件整体稳定性建立有效的联系。采用板壳单元,精确地模拟了箱形截面构件的壁板局部失稳及其相互作用,在大挠度、弹塑性范围内对箱形截面的稳定极限承载性能进行了研究。在大量数值分析的基础上,分别归纳总结了箱形截面构件在承受轴向压力、纯弯曲以及弯矩与轴力共同作用下的稳定极限承载力简化计算公式,对箱形截面构件稳定承载力计算及设计有参考价值。这种把构件稳定承载力设计与构件几何尺寸建立直接关系的直接强度设计法,会改进采用有效宽度法产生的误差,可以为薄壁结构相关技术规程修订时参考。Abstract: The accurate prediction of ultimate load-carrying capacity of welded box section subjected to local plate buckling has still not established in the current Chinese Code for Design of Steel Structure.This paper presents a direct strength method for predicting accurately ultimate load-carrying capacity of locally buckled box section under axial load,pure moment and their combination,respectively.A finite shell element is employed to exactly simulate the sectional geometric shape and boundary conditions,with incorporation of plate large displacement and elastic-plastic material.Based on numbers of numerical results,three simplified design formulas are respectively proposed to calculate the ultimate load-carrying capacity of the hollow section under the three load conditions mentioned above.The formulas are expressed directly with function of the component plate width-thickness ratio and section aspect ratio,and they are very convenient for designers,compared with the effective width method.
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Key words:
- box section /
- ultimate load-carrying capacity /
- design formula
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[2] GB 500112001建筑抗震设计规范[S]. JGJ 9998高层民用建筑钢结构技术规程[S]. [3] GB 500172003钢结构设计规范[S]. [4] Little G H.The Strength of Square Steel Box Columns-Design Curvesand Their Theoretical Basis[J].The Structural Engineer,1979,57A(2):49-61. [5] Richard Liew J Y,Shanmugam N E,Lee S L.Behavior of Thin-Walled Steel Box Columns Under Biaxial Loading[J].Journal ofStructural Engineering,1988,115(12):3076-3095. [6] Chiew Singping,Lee Seng-Lip,Nandivaram E Shanmugam.Experimental Study of Thin Walled Steel Box Columns[J].Journal ofStructural Engineering,1987,113(10):2208-2221. [7] Nandivaram E Shanmugam,Chiew Sing-ping,Lee Seng-Lip.Strengthof Thin-Walled Square Steel Box Columns[J].Journal of StructuralEngineering,1987,113(4):818-831. [8] Shanmugam N E,Richard Liew J Y,Lee S L.Ultimate StrengthDesign of Biaxially Loaded Steel Box Beam-Columns[J].J.ConstructSteel Research,1993,26:99-123. [9] Richard Liew J Y,Shanmugam N E,Lee S L.Tapered Box ColumnsUnder Biaxial Loading[J].Journal of Structural Engineering,1989,115(7):1697-1711. [10] Hanmugam N E,Richard Liew J Y,Lee S L.Weld Steel Box ColumnsUnder Biaxial Loading[J].J.Construct.Steel Research,1989(12):119-139. [11] Richard Liew J Y,Shanmugam N E,Lee S L.Design of Thin-PlatedSteel Box Columns Under Biaxial Loading[J].J.Construct SteelResearch,1990,16:39-70. [12] Antonio F Mateus,Joel A Witz.A Parameter Study of the Post-Buckling Behavior of Steel Plate[J].Engineeering Structure,2001(23):172-185. -
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