Static behavior of compressed braces in RHS K-joints of hot-dip galvanized trusses

Abstract This paper presents the results of an investigation to evaluate the influence of holes on the mechanical resistance of K-joints in hot-dip galvanized tubular structures. Such holes are used as vent in Warren and Pratt lattice girders using rectangular hollow sections and K- and N-joints. Full scale joints were tested in which a compression load was applied on one brace member with one of the ends of the chord being left free. The other two ends of the joint were pinned to ensure predominantly axial force transfer. The test program examined the effects of a number of variables, including the presence or absence of the vent hole, the dimensions of the RHS, the ratio of the brace/chord wall thicknesses and the angle between the brace and the chord members. These tests were also numerically simulated for validation of the simulation model. It is expected that this research will form the basis of recommendations to help structural engineers in designing galvanized hollow truss structures with vent holes.

[1]  Jeffrey A Paker,et al.  Hollow structural section connections and trusses : a design guide , 1997 .

[2]  M. A. Serrano López,et al.  Effect of the vent hole geometry and welding on the static strength of galvanized RHS K-joints by FEM and DOE , 2012 .

[3]  Chanakya Arya,et al.  Eurocode 3: Design of steel structures , 2018, Design of Structural Elements.

[4]  Jeffrey A. Packer,et al.  Design guide for rectangular hollow section (RHS) joints under predominantly static loading , 1992 .

[5]  P. J. García Nieto,et al.  Non-linear buckling analysis of a self-weighted metallic roof by FEM , 2010, Math. Comput. Model..

[6]  Benjamin W. Schafer,et al.  Computational modeling of cold-formed steel: characterizing geometric imperfections and residual stresses , 1998 .

[7]  X. Zhao,et al.  Hollow sections in structural applications , 2010 .

[8]  K. S. Sivakumaran,et al.  Material Properties Models for Analysis of Cold-Formed Steel Members , 1997 .

[9]  Xing Jihui.  Research on hysteretic behavior of steel circular-tube members under constant compression and cyclic bending , 2010 .

[10]  Francisco J. Suárez,et al.  Resistance of the component ‘lateral faces of RHS’ at high temperature , 2010 .

[11]  László Dunai,et al.  Finite element modelling and analysis of bolted joints of 3D tubular structures , 2004 .

[12]  M.M.K Lee,et al.  Strength, stress and fracture analyses of offshore tubular joints using finite elements , 1999 .

[13]  P. J. García Nieto,et al.  Non-linear analysis of the tubular ‘heart’ joint by FEM and experimental validation , 2007 .

[14]  Jaap Wardenier,et al.  Hollow section joints , 1982 .

[15]  Hong Chang,et al.  Analysis on the Chord Side Wall Failure of RHS T-Joints with Axial Compression Branch , 2010 .

[16]  Miguel A. Serrano-López,et al.  Stiffness of the component ‘lateral faces of RHS’ at high temperature , 2011 .