Detail publikace

STRENGTHENING OF AXIALLY LOADED COLUMNS UNDER LOAD

VILD, M. BAJER, M.

Originální název

STRENGTHENING OF AXIALLY LOADED COLUMNS UNDER LOAD

Anglický název

STRENGTHENING OF AXIALLY LOADED COLUMNS UNDER LOAD

Jazyk

en

Originální abstrakt

This paper refers about behaviour and capacity of strengthened rods while under static load. A thin-walled T profile is subjected to axial force and a second flange is welded to the T profile thus creating an I profile. When the T profile is pressed, local buckling of thin web causes an eccentricity of loading force and therefore an additional bending moment. Because of initial stresses and deflected shape of the T profile, the strengthened I profile has lower resistance in comparison with a regular welded I profile. Knowing the loading sequence and a shape of imperfections of the newly created I profile, the reduction factor can be determined. Current standards do not refer to this problem. Analytical solution variants based on methods used in Eurocodes are introduced: the conservative approach using effective characteristics of T profile for calculation of stress from preload; the approach using full area of T profile; the approach using full area of I profile neglecting the loading history. The variant analytical solutions are compared with a finite element model in Midas FEA code. An experiment, described in this paper, is being prepared to validate the results from finite element models and suggested analytical approach.

Anglický abstrakt

This paper refers about behaviour and capacity of strengthened rods while under static load. A thin-walled T profile is subjected to axial force and a second flange is welded to the T profile thus creating an I profile. When the T profile is pressed, local buckling of thin web causes an eccentricity of loading force and therefore an additional bending moment. Because of initial stresses and deflected shape of the T profile, the strengthened I profile has lower resistance in comparison with a regular welded I profile. Knowing the loading sequence and a shape of imperfections of the newly created I profile, the reduction factor can be determined. Current standards do not refer to this problem. Analytical solution variants based on methods used in Eurocodes are introduced: the conservative approach using effective characteristics of T profile for calculation of stress from preload; the approach using full area of T profile; the approach using full area of I profile neglecting the loading history. The variant analytical solutions are compared with a finite element model in Midas FEA code. An experiment, described in this paper, is being prepared to validate the results from finite element models and suggested analytical approach.

Dokumenty

BibTex


@inproceedings{BUT109433,
  author="Martin {Vild} and Miroslav {Bajer}",
  title="STRENGTHENING OF AXIALLY LOADED COLUMNS UNDER LOAD",
  annote="This paper refers about behaviour and capacity of strengthened rods while under static load. A thin-walled T profile is subjected to axial force and a second flange is welded to the T profile thus creating an I profile. When the T profile is pressed, local buckling of thin web causes an eccentricity of loading force and therefore an additional bending moment. Because of initial stresses and deflected shape of the T profile, the strengthened I profile has lower resistance in comparison with a regular welded I profile. Knowing the loading sequence and a shape of imperfections of the newly created I profile, the reduction factor can be determined. Current standards do not refer to this problem. Analytical solution variants based on methods used in Eurocodes are introduced: the conservative approach using effective characteristics of T profile for calculation of stress from preload; the approach using full area of T profile; the approach using full area of I profile neglecting the loading history. The variant analytical solutions are compared with a finite element model in Midas FEA code. An experiment, described in this paper, is being prepared to validate the results from finite element models and suggested analytical approach.",
  address="ECCS European Convention for Constructional Steelwork",
  booktitle="EUROSTEEL 2014, 7th European Conference on Steel and Composite Structures",
  chapter="109433",
  howpublished="print",
  institution="ECCS European Convention for Constructional Steelwork",
  year="2014",
  month="september",
  pages="201--202",
  publisher="ECCS European Convention for Constructional Steelwork",
  type="conference paper"
}