摘要：The EN 1993-1-1 model of equivalent stabilizing forceqdandRdof bracings conservatively assumes that the braced member is compressed with a force constant along its length. This assumption is incorrect since the axial force distribution varies along the length of the braced member. As a result, the braced member generates equivalent stabilizing forces different from equivalent forceqdandRdacc. to EN 1993-1-1. This paper presents parametric studies of the equivalent stabilizing forces of the braced, compression top chord of roof trusses. The girder’s top chord is compressed parabolically by a variable axial force. The values of the axial compressive forces is:Nsuppin the support zone of truss andNspanin the central zone of truss. Parametric analyses of the equivalent stabilizing force and the stress of the purlins and the bracings depending on axial forcesNsuppandNspanin the braced member were carried out. The investigated problem is illustrated with exemplary calculations of the equivalent force in trusses.
