Resistances of Metal I-Sections under Bending and Torsion

3rd World Multidisciplinary Civil Engineering, Architecture, Urban Planning Symposium

土木建筑工程;文学

Balaz, Ivan^1 ; Kolekova, Yvona^1

Department of Metal and Timber Structures, Faculty of Civil Engineering, STU in Bratislava, Radlinského 11, Bratislava

812 43, Slovakia^1

关键词: Aluminium structures;    Analytical results;    I-sections;    Internal forces;    Limit state;    Plastic resistance;    Shear force;    Torsional moment;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/471/5/052091/pdf
DOI  :  10.1088/1757-899X/471/5/052091

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

Interaction formulae for the resistance of I sections under the combination of the internal forces of the bending and the torsion. The resistances of I- and H-sections under combination of the bending and the torsion are investigated for the limit states: (i) elastic and (ii) plastic without strengthening. Simple interaction formulae for I- and H-sections convenient for the standard purposes are presented. There are investigated interactions: (i) the bending moment and the bimoment, (ii) the shear force and the St. Venant torsional moment. Results of the large parametrical study of the shear area I- and H-sections are presented too. The shear area and the shear torsion constant formulae are convenient for any shape of the open or closed cross-section. Metal (steel and aluminium) sections are investigated. The proposals are presented for the new generation of Eurocodes EN 1993-1-1 Design of steel structures and EN 1999-1-1 Design of aluminium structures. The formulae for shear area used in EN 1993-1-1: 2005 may give especially for small sizes HEA 100, HEB 100 and HEM 100 sections the values of the relative shear area up to 1.9. This is not acceptable. The relative shear area is defined as the ratio of shear area to web area hwtw . The experiments shown that the shear area is restricted by the value ηhwtw , where 1,0 ≤ η ≤ 1,2. The proposal how to improve incorrect formula given in the final draft prEN 1993-1-1, 2017 relating to the interaction of the bending moment and the bimoment is presented. The generalised formula valid for the all section Classes was accepted for the final draft prEN 1999-1-1 and it is presented too. The all analytical results and the formulae of the authors were verified and confirmed by the computer programs QST-TSV-3Blech (RU Bochum) and DUENQ (Dlubal Software). Comparisons of the elastic and 5 plastic resistances of the H-section under the combination of shear force and the St. Venant torsional moment, including one proposed by authors for prEN 1999-1-1.