Effects of Factors That Influence Out-of-Plane Lateral-Torsional Buckling on Freestanding Circular Arches

Emmanuel-Peters Teke Tebo,Leonard Masu,Patrick Nziu

doi:10.1155/2020/4892070

Abstract

This paper presents the effects of the several factors that influence lateral-torsional buckling on freestanding circular arches. The studied factors that attribute to the effects of lateral-torsional buckling include cross section type, included angle, slender ratio, imperfection, loading, and boundary conditions. From the reviewed studies, the misrepresentation of these factors to a certain extent may yield inaccurate results. Several studies and design codes have proposed different solutions to account for these factors in designs against lateral-torsional buckling for some structural elements. However, there were no studies reported on the out-of-plane lateral-torsional buckling of fixed circular arches made of structural aluminum channel sections subjected to central concentrated load. Therefore, there is a need for further research on the lateral-torsional buckling real behavior of fixed circular arches of structural aluminum channels.

Highlights

In this review study, an arch is referred to as a beam curved in elevation and loaded in its plane, with its supports prevented from moving together or apart [1]
Most of these studies paid attention to double symmetric I-sections as compared to monosymmetric sections like channels, such sections may behave differently under Lateral-torsional buckling flexural-torsional buckling (FTB) (LTB) due to their shear center position. e shear center position makes such sections experience eccentric loading in structures. is factor among others mentioned in Sections 3.1 and 3.2 has been well studied by researchers using one or many of the measure buckling methods mentioned in Section 2. e numerical methods can be cited as the most preferred for buckling analysis. is is because numerical methods are less complex for inelastic analysis as compared to the analytical ones
Lateral-torsional buckling is found to be influenced by loading, boundary conditions, included angles, slenderness, cross section, and imperfections

Summary

Introduction

An arch is referred to as a beam curved in elevation and loaded in its plane, with its supports prevented from moving together or apart [1]. E steel and aluminum “Al” alloys members are the most commonly used materials for arches in structural applications ([4]:762). Based on the profile type, some of these members that are applied in structures as load-bearing skeleton may experience buckling stability problems. E buckling instabilities on steel and Al alloys with open thin-walled double and monosymmetric sections acting as arches have been extensively researched [4]. Despite the application of these sections in structure, especially in areas where high performance with minimum weight is required [6], both the double and monosymmetric sections used as a load-bearing skeleton in structures are liable to experience instability caused by the lateral-torsional buckling “LTB” [2]

Methods

Findings

Discussion

Conclusion