1 / 12

LSCE 2004, Częstochowa

Janusz Murzewski, Kraków, PRACA ODCIĄGÓW w MASZTACH STALOWYCH BEHAVIOUR OF GUYS OF STEEL MASTS. LSCE 2004, Częstochowa. NONLINEAR FIRST ORDER THEORY. Streletski, M oscow,1961 Petersen, Berlin 1970 etc. Old Polish Standard PN-79/B-03204. SIMPLE SECOND-ORDER THEORY.

alta
Download Presentation

LSCE 2004, Częstochowa

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Janusz Murzewski, Kraków, PRACA ODCIĄGÓW w MASZTACH STALOWYCHBEHAVIOUR OF GUYS OF STEEL MASTS LSCE 2004, Częstochowa

  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. NO-WIND SITUATION2-nd order parabola 4-th order parabola

  6. 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

More Related