Small-scale laterally-unrestrained corrugated web girders: (II) Parametric studies and LTB design
Artikel i vetenskaplig tidskrift, 2022

As shown in the companion paper, innovative tests of corrugated web girders (CWGs) were performed followed by validation of the finite element (FE) model. Accordingly, this paper continues investigating the lateral–torsional buckling of small-scale corrugated web girders through parametric studies. This is to expand the available data required to unveil their behaviour and strength. The layout of the tested girders is considered herein, where the webs of small corrugation dimensions are under pure bending moment with symmetrical boundary conditions. This study deals with the linear and nonlinear buckling analyses of the lateral–torsional buckling (LTB) of CWGs using ABAQUS software. Accordingly, 108 models are conducted, considering the effects of the girder length, web overall dimensions, corrugation dimensions, flange dimensions and different steel grades. The results show that increasing the girder length decreases consequently the ultimate flexural strength and stiffness of CWGs. With regard to the web overall dimensions, increasing the web depth is found to have a significant effect on the strength of CWGs in contrast to the effect of the web thickness value, which has insignificant effect on strength. Furthermore, the results revealed that increasing the flange dimensions increases subsequently the strengths of CWGs. In addition, it is noted that the lower the steel grade, the more effectively the material is used especially for girders failing elastically. Additionally, the critical and design LTB strengths of small-scale CWGs with small corrugation dimensions are evaluated. The comparisons show that the critical LTB stress requires modifications to accord well with FE results. Furthermore, comparisons of the ultimate FE strengths with those of Lindner's equation (1990), EC3 (2004) and AISC (2010) are provided. The comparisons exhibit that the predictions of Lindner's equation (1990) are suitable, while the predictions of EC3 (2004) and AISC (2010) are highly conservative. Therefore, modifications are made for EC3 (2004) and AISC (2010) design models to provide more appropriate design strengths for CWGs with small corrugation dimensions for use in buildings.

AISC

Lateral–torsional buckling

Parametric study

EN1993-1-1

Small-scale corrugated web

Finite element analysis

Författare

M. F. Hassanein

Tanta University

Southwest Petroleum University China

Yu Mei Zhang

Chongqing University

Southwest Petroleum University China

A. A. Elkawas

Higher Institute of Engineering and Technology

Mohammad al-Emrani

Chalmers, Arkitektur och samhällsbyggnadsteknik, Konstruktionsteknik

Yong Bo Shao

Southwest Petroleum University China

Thin-Walled Structures

0263-8231 (ISSN)

Vol. 180 109776

Ämneskategorier

Teknisk mekanik

Annan materialteknik

Husbyggnad

DOI

10.1016/j.tws.2022.109776

Mer information

Senast uppdaterat

2022-08-03