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Janusz Murzewski, Kraków, Poland NEW RULES FOR DESIGN OF GUYED MASTS

Janusz Murzewski, Kraków, Poland NEW RULES FOR DESIGN OF GUYED MASTS. 10th Nordic Steel Construction Conference Copenhagen, 7-9 June 2004 1. NONLINEAR FIRST ORDER THEORY. Streletski, M oscow,1961 Petersen, Berlin 1970 etc. Old Polish Standard PN-79/B-03204.

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Janusz Murzewski, Kraków, Poland NEW RULES FOR DESIGN OF GUYED MASTS

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  1. Janusz Murzewski, Kraków, PolandNEW RULES FOR DESIGN OF GUYED MASTS 10th Nordic Steel Construction Conference Copenhagen, 7-9 June 20041

  2. NONLINEAR FIRST ORDER THEORY • Streletski, Moscow,1961 • Petersen, Berlin 1970 • etc. • Old Polish Standard PN-79/B-03204

  3. SIMPLE SECOND-ORDER THEORY • Eurocode 3 Steel design. General rules prEN:1997 • Polish Steel Design Standard PN-90/B-03200

  4. ADVANCED SECOND-ORDER THEORY • European Prestandard prEN 1993-3-1:1997 Towers and masts • New Polish Standard PN-B-03204:2002

  5. false slope g [kN/m] = const true slope G [kN] = const NO-WIND SITUATION2-nd order parabola 4-th order parabola

  6. W(lo,qo) = const W(l,q) – non-conservative WINDWARD GUY at ULS2-nd order parabola nearlystraight line

  7. SBa - inclined SBa - horizontal LEEWARD GUY at ULS2-nd order parabola Non- analytical curve

  8. c(L) – buckling factor yM(z)+yN(z) - amplification THE ELASTIC SHAFTcontinuous beam free beam-column

  9. Wind patch loading MW=Mm+SMp -global effect Geometrical imperfections Dyi=li/250 - to be amplified UNCERTAIN INNOVATIONSprENV 1993-3-1:1997(who?) PN-B-3204:2002 (A.Cz.)

  10. CONCLUSIONS I • Out-of-plumb f is the main reason of non-linear behaviour • Normal-to-the-shaft component of gravity loads G sinf • Moment of external forces at the bottom hinge M0=0

  11. 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

  12. 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

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