Investigation on elastic compound buckling of latticed columns considering eccentricity and geometric imperfections

Yinqi Li,Yangzhi Ren,Bin Wang,Wenming Cheng

doi:10.1177/1687814019847400

Abstract

This article investigates the elastic compound buckling behavior of latticed columns with three lacing systems under two boundary conditions. Valid numerical method named SEM, that conducts bucklin...

Highlights

Built-up columns are widely used in steel buildings and bridges
The other two are latticed columns with several chords connected by battens or lacing bars (Figure 1(b) and (c))
The global buckling displacements of latticed columns coincide with Euler columns under the two boundary conditions, while the local buckling deformations of columns were considered all along with simple supports between adjacent lacing joints

Summary

Introduction

Built-up columns are widely used in steel buildings and bridges. There mainly exist three types of built-up columns in structural engineering. The critical buckling load relating to low-order buckling failure modes in Figure 3 were calculated with numeral analysis method SEM separately considering the strain energy of bars and total potential energy of chords. The global buckling displacements of latticed columns coincide with Euler columns under the two boundary conditions, while the local buckling deformations of columns were considered all along with simple supports between adjacent lacing joints. Under supported boundary condition, the shape functions of chords are given in equation (1), which can express all the low-order buckling deformations of latticed columns pz pmz ui = C1(i) sin L + C2(i) sin L ð1aÞ vi = C3(i) sin L ð1bÞ ui = C4(i) sin L + C5(i) sin L ð1cÞ. According to assumptions 3 and 4, the lacing bars were considered to be separately deformable bodies with

À cos 2L

Summary and conclusion

Findings

Based on the nonlinear buckling deformation