LSCE 2004, Częstochowa
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Transcript of LSCE 2004, Częstochowa
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Janusz Murzewski, Kraków,
PRACA ODCIĄGÓW w MASZTACH STALOWYCH
BEHAVIOUR OF GUYS OF STEEL MASTS
LSCE 2004, Częstochowa
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NONLINEAR FIRST ORDER THEORY
• Streletski, Moscow,1961
• Petersen, Berlin 1970
• etc.• Old Polish Standard
PN-79/B-03204
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SIMPLE SECOND-ORDER THEORY
• Eurocode 3 Steel design. General rules prEN:1997
• Polish Steel Design Standard PN-90/B-03200
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ADVANCED SECOND-ORDER THEORY
• European Prestandard prEN 1993-3-1:1997 Towers and masts
• New Polish Standard PN-B-03204:2002
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NO-WIND SITUATION
2-nd order parabola 4-th order parabola
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WINDWARD GUY at ULS2-nd order parabola nearly straight line
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LEEWARD GUY at ULS2-nd order parabola Non- analytical curve
SBa - inclined SBa - horizontal
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THE ELASTIC SHAFTcontinuous beam free beam-column
() – buckling factor yM(z)+yN(z) - amplification
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UNCERTAIN INNOVATIONS prENV 1993-3-1:1997(who?) PN-B-3204:2002 (A.Cz.)
Wind patch loading
MW=Mm+Mp -global effect
Geometrical imperfections
yi=li/250 - to be amplified
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CONCLUSIONS I
• Out-of-plumb is the main reason of non-linear behaviour
• Normal-to-the-shaft component of gravity loads G sin
• Moment of external forces at the bottom hinge M0 = 0
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CONCLUSIONS II
• Non-linear behaviour of the windward guy – not important
• Deformation of leeward guy needs not to be analysed
• The mast at the ULS is statically determined
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CONCLUSIONS III
• If there are degrees of freedom of the analysis, initial tensions of guys may be optimised
• The mass of guys remains constant during deformation
• Patch load procedure and geometrical imperfections shall be verified