Abstract
The author has presented in this paper his own experimental research on the maximum value and distribution of load in transverse roof bracing caused by a planar truss girder with geometrical imperfections. The tests were performed on 7.0 m long test models of steel truss made of square hollow sections. The tests performed verify standard recommendations concerning adoption of uniformly distributed notional load of transverse roof bracing and confirm the relations indicated in the discussed literature. The experimental research results were cross-checked by relevant numerical analysis. A comparison of notional loads recommended by the standard and literature with test results was performed and conclusions were formulated.
Highlights
Use of steel trusses as main structures in hall objects is a very economic solution due to high in-plane stiffness of truss girders
First and foremost, from large spacing of truss chords connected by proper web members
According to the standard [9] during designing of bracing, additional load originating from geometrical imperfection of the roof girder upper truss chord featuring parabolic shape with maximum e0 = L/500 (L – truss length) must be taken into account
Summary
Use of steel trusses as main structures in hall objects is a very economic solution due to high in-plane stiffness of truss girders Such stiffness originates, first and foremost, from large spacing of truss chords connected by proper web members. According to the standard [9] during designing of bracing, additional load originating from geometrical imperfection of the roof girder upper truss chord featuring parabolic shape with maximum e0 = L/500 (L – truss length) must be taken into account. The standard guidelines recommend substitution of the chord’s geometrical imperfection by adoption of a uniformly distributed notional load q taking into account the number of braced trusses m (αm coefficient) and the second order effects δq from load q and external load. The relations indicated in [10 and 11] were not confirmed experimentally until now
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