Abstract
Trussed structures in modern bridge building usually have “W” bracing. Structural joints are often based on application of gusset plates. Experimental tests of stress distribution in such gusset plates are rather sparse. Lab testing of scaled bridge truss girder was carried out in Poznań University of Technology in Poznań. Investigation into stress distribution in gusseted joint was carried out. Test results were put against results obtained from analyses of two finite element models: beam-element model and shell-element model. Normal stress and Huber-Mises equivalent stress distributions within gusseted joint were analysed. General conclusions are: a) normal stress distribution in gusseted joint cross-section, perpendicular to truss flange axis, is nonlinear and extreme stresses occur near cross-section edges, b) Huber-Mises equivalent stress distribution in the cross-section of gusset plate near its connection to truss flange is nonlinear and extreme stresses occur near centre of the cross-section, c) assessment of normal stresses in gusseted joints should not be carried out with an aid of beam-element modelling, d) it is possible to assess Huber-Mises equivalent stresses in gusset plate near its welded connection to rigid flange with an aid of beam-element modelling if non-uniform distribution of shear stress is taken into account, e) shell-element modelling of gusseted joint provides satisfactory accuracy of normal and equivalent stress assessment, f) beam-element modelling of friction grip bolts is sufficiently accurate for shell-element models of steel joints analysed within elastic range of behaviour.
Highlights
To reduce gusset plate dimensions flange theoretical axis is situated near the level of gusset plate – to – flange connection, instead of at the flange neutral axis
Part of truss flange together with gusset plate is analysed as a beam in bending and tension at the same time (Szelągowski 1966) – Fig. 5
finite element method (FEM) allows for accurate analysis of stress distribution in gusset plates
Summary
One of the oldest methods of gusset plate design is based on beam analogy. Part of truss flange together with gusset plate is analysed as a beam in bending and tension (or compression) at the same time (Szelągowski 1966) – Fig. 5. The assumption is made that gusset plate carries stress over the width w Simplified method of design of gusset plates under assumption that they buckle after yielding is available (Yam, Cheng 1994). This method takes into account stress redistribution in gusset plate after its yielding but before buckling The methods are meant to assess the load carrying capacity of gusset plates instead if extreme stress level and stress distribution. They can hardly be applied to fatigue design
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
