slovak university of technology in bratislava slovak ... slovak republic, european union hong kong...

Download SLOVAK UNIVERSITY OF TECHNOLOGY IN BRATISLAVA SLOVAK ... slovak republic, european union hong kong icsas

Post on 12-Jul-2020

0 views

Category:

Documents

0 download

Embed Size (px)

TRANSCRIPT

  • Prof. Ivan BALÁŽ Assoc. Prof. Yvona KOLEKOVÁ Ing. Michal KOVÁČ Ing. Tomáš ŽIVNER

    SLOVAK UNIVERSITY OF TECHNOLOGY IN BRATISLAVA

    SLOVAK REPUBLIC, EUROPEAN UNION

    ICSAS 2016HONG KONG

  • SLOVAK REPUBLIC EUROPEAN UNION

    POPULATION 5 100 000 510 000 000

    CAPITAL BRATISLAVA BRUSSELS

  • CRITICAL FORCE Ncr,TF OF TORSIONAL-FLEXURAL BUCKLING

    FOR ANY COMBINATIONS OF BENDING AND

    TORSION BOUNDARY CONDITIONS FEd

    Monosymmetric section Section without axis of symmetry

  • ANY COMBINATIONS OF

    BOUNDARY CONDITIONS

    IN BENDING AND

    IN TORSION

  • Monosymmetric section Ncr,TFz

    z z z z

    y y y y

    Ncr,TFz

    NOTE: valid only when bending and torsion boundary conditions are the same.

  • Monosymmetric section Ncr,TFz

    z z z z

    y y y y

  • 1940, 1958

    1941

    1954

    1962

    1982

    Boundary conditions in stability of members in

    compression. Prague.

  • 1941

  • 1954

    0.721

    0.721

  • 1962

    He calculated αzw values for all 100 combinations

    of bending and torsion boundary conditions.

    Many of them are incorrect.

  • Table is valid also for sections

    without axis of symmetry

  • Large parametrical study using FEM

  • When αzw = 1.0

  • Max. error 30 %

    on safe side

    when αzw = 1

    Max. error 30 %

    on safe side

    when αzw = 1

    Max. error 15 %

    on safe side

    when αzw = 1

  • New generation of EN 1999-1-1

    will contains the following table with

    improved

    αzw values smaller than 1.0

    giving errors in Ncr,TFz in

    interval -3% - +5%.

    The errors in

    relative slenderness λ will be smaller

    and in reduction factor χ and in member

    resistance Nb,Rd even smaller.

  • THE END

Recommended

View more >