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AXIALLY LOADED CARRYING CAPACITY CALCULATION OF THIN-WALLED COLD-FORMED CHANNEL COLUMNS WITH INCLINED SIMPLE EDGE STIFFENERS BY DIRECT STRENGTH METHOD
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摘要: 通过计算得到了适合各种弯起角度的斜卷边槽形截面特性计算公式,方便了手算求解构件的屈曲应力。采用直接强度计算法对斜卷边槽钢轴压固支柱的稳定承载力及破坏模式进行了分析,并与已有的试验资料进行了对比。结果表明:直接强度法可以有效地预测斜卷边槽钢轴压固支构件的稳定承载力,从而说明了建立在简支试验结果基础上,经回归得到的直接强度法同样适用于固支柱稳定承载力的计算。Abstract: Section geometric properties of channels with different bending degrees of inclined simple edge stiffeners are gained by calculation. It is convenient for solving the buckling stress by hand. The test strengths and failure modes reported by an experimental reference of axially loaded fixed-ended channels with inclined simple edge stiffeners are compared with the strengths predicted using direct strength method. It is shown that direct strength method is valid for predicting the stability capacity of axially loaded fixed-ended channel columns with inclined simple edge stiffeners, consequently it is indicated that direct strength method which was developed based on the regression of pin-ended tests results is also applicable for calculating the stability capacity of fixed-ended columns.
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[2] Young B,Yan J.Design of Cold-Formed Steel Channel Columns with Complex Edge Stiffeners by Direct Strength Method.J.Struct.Eng.,2004,130(11):1 756-1 763 Schafer B W,Pekz T.Direct Strength Prediction of Cold-Formed Steel Members Using Numerical Elastic Buckling Solutions∥ Second International Conference on Thin-Walled Structures:Thin-Walled Structures Research and Development.Singapore:Elsevier Science Ltd,1998:137-144 [3] Young B,Hancock G J.Compression Tests of Channels with Inclined Simple Edge Stiffeners.J.Struct.Eng.,2003,129(10):1 403-1 411 [4] BS5950.Part 5.Structural Use of Steelwork in Building.Code of Practice for Design of Cold Formed Thin Gauge Sections.2000 [5] Schafer B W,Pekz T.Laterally Braced Cold-Formed Steel Flexural Members with Edge Stiffened Flanges.J.Struct.Eng.,1999,125(2):118-127 [6] Lau S C W,Hancock G J.Distortional Buckling Formulas for Channel Columns.J.Struct.Eng.,1987,113(5):1 063-1 078 [7] Schafer B W.Local,Distortional and Euler Buckling of Thin-Walled Columns.J.Struct.Eng.,2002,128(3):289-299 [8] 陈骥.钢结构稳定--理论与设计.北京:科学出版社,2003:256-273 [9] 郭在田.薄壁杆件的弯曲与扭转.北京:中国建筑工业出版社,1989:374-378 [10] 0 Hancock G J,Murray T M,Ellifritt D S.Cold-Formed Steel Structures to the AISI Specification.New York:Marcel Dekker,Inc.,2001:357-392 -
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