Lateral - Torsional Buckling of Various Steel Trusses

Volume 7 Issue 1 March - May 2018

Research Paper

Lateral - Torsional Buckling of Various Steel Trusses

K.S.Vivek*, C. Ravi Kumar Reddy**, K. S. Sai Ram***

* Assistant Professor, Department of Civil Engineering, VVIT, Andhra Pradesh, India.

** Professor, Department of Civil Engineering, KHIT, Andhra Pradesh, India.

*** Professor, Department of Civil Engineering, RVR & JC CE, Andhra Pradesh, India.

Vivek, K.S., Reddy, C.R.K., and Ram , K.S.S. (2018). Lateral - Torsional Buckling of Various Steel Trusses. i-manager’s Journal on Structural Engineering, 7(1), 6-12. https://doi.org/10.26634/jste.7.1.14280

Abstract

Lateral-torsional buckling behavior of various types of steel trusses without and with intermediate lateral rigid supports is investigated by performing finite element analysis. Commonly used parallel chord trusses, such as Pratt, Howe, Warren (with verticals), K and Diamond trusses of span 8 m and rise 0.8 m are considered. Two different types of intermediate lateral rigid support systems are considered. Elastic critical buckling joint loads of the trusses are found by modeling and performing finite element analysis using ANSYS - commercial software. From the obtained results it can be understood that critical buckling load, the magnitude and shape out of plane deflection depends upon whether the intermediate lateral support is provided or not and if provided, the type of lateral supports and spacing between them. The pattern and inclination of the web lacing also affect the stability of the truss. It is found that the Diamond and K trusses resulted in better stability and hence suggested for use in place of large spans and heavy loading.