BENDING AND TWISTING ABOUT A CONSTRAINED AXIS OF Z-SECTION PURLINS WITH ONE SAG ROD AT MIDSPAN

Tong Genshu; Wu Qiang; Zhang Lei

doi:10.13204/j.gyjz201312001

Volume 43 Issue 12

Dec. 2014

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Tong Genshu, Wu Qiang, Zhang Lei. BENDING AND TWISTING ABOUT A CONSTRAINED AXIS OF Z-SECTION PURLINS WITH ONE SAG ROD AT MIDSPAN[J]. INDUSTRIAL CONSTRUCTION, 2013, 43(12): 1-11. doi: 10.13204/j.gyjz201312001

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BENDING AND TWISTING ABOUT A CONSTRAINED AXIS OF Z-SECTION PURLINS WITH ONE SAG ROD AT MIDSPAN

doi: 10.13204/j.gyjz201312001

1.
Institute of High-Performance Materials and Structures,Zhejiang University,Hangzhou 310058,China

Received Date: 2013-08-04
Publish Date: 2013-12-20

Abstract

Abstract

The sag Rods connected to the webs of puRlins weRe RegaRded as the lateRal elastic suppoRts of the puRlins. The formulas for calculating the Rigidity of the sag Rod weRe established by deRiving the web deformation of the puRlin accoRding to the theoRy of plate and shell，and then the Rigidity of the sag Rod taking account of the web deformation was got，which was modified by FE analysis. It was found that for a Z-section puRlin undeR wind suction，the Reaction within the sag Rod was small. Hence theRe would be a veRy limited effect on the stRess，and also a small distoRtional deformation of the sag Rod section if the sag Rod was simplified as a lateRal Rigid suppoRt oR elastic one. FoR the Z-section the calculated stRess would have excellent accuRacy when the EC3 method，two-way bending method and the method of one-way bending about the paRallel axis weRe used.
- purlin,
- Z-section,
- stress,
- elastic support

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References(5)

References

[2] Timoshenko S,Woinowsky Krieger S.Theory of Plates and Shells[M].New York: McGraw Hill Company, 1959.

Polyzois D.Sag Rods as Lateral Supports for Girts and Purlins[J].Journal of Structural Engineering, ASCE,1987, 113 (7):1521-1531.

[3] 童根树, 吴强, 张磊.跨中设拉条 C 形截面简支檩条绕强迫轴的弯曲与扭转[J].工业建筑, 2013, 43(12);12-20.

[4] 童根树, 吴强.Z 形截面檩条强度计算时的下翼缘假想水平荷载[J].工业建筑, 2012, 42(4):136-142.

[5] Polyzois D,Birkemore P C.Z-Section Girts Under NegativeLoadings[J].Journal of Structural Engineering, ASCE, 1985, 111(3):528-544.

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