The effect of axial beam force on moment–rotation curve of top and seat angels connections

Abstract

Bolted top and seat angle connections are mainly designed to sustain gravitational loads of simply supported steel beams. However, the inherent flexural resistance of such connections may not be ignored when an accurate analysis of semirigid steel frames is desired. Current research aims at studying moment–rotation behaviour of this type under combined moment and axial tension force. Several refined three‐dimensional finite element models are created based on the previous experimental studies, and their accuracy is examined trough a comparison to test results from previous experimental studies. This study showed that the axial tension force reduces the connection initial stiffness and moment capacity. Based on the results obtained from analysing a series of finite element models under combined axial tension and moment loading, an equation is presented to estimate the affected moment–rotation response of such connections in terms of the connection geometrical properties, its moment–rotation response in the case of zero axial force and an expected axial tension force. Copyright © 2009 John Wiley & Sons, Ltd.

Moment–rotation curve characteristics and initial rotational stiffness calculation method of angle connections

“…However, because the angle steel is equivalent to a T‐stub in the EC3 method, the component's boundary conditions are greatly simplified, resulting in poor calculation accuracy. Based on the FEA simulation results of a series of axial tension and bending moments, Primoz et al [ 14 ] proposed an equation to estimate the moment rotation response of top and seat angle connections according to the geometric characteristics. While most scholars regard the column flange and web as T‐stub to calculate column flange deformation, [ 1,15–17 ] the actual column flange is an out‐of‐plane deformation plate.…”

Experimental Evaluation of the Full-Range Behaviour of Steel Beam-to-Column Connections

“…Seeing the semi-rigidity of joints affects the strength and serviceability of unbraced steel frames, a large number of studies have been carried out to investigate the semi-rigid behaviour of different types of beam-to-column joints, including bolted end-plate connections [1][2][3], top-and-seat angle connections [4][5][6], web angle connections [7][8][9], and other connection types [10][11][12]. Based on these studies, connection models have been proposed aimed at predicting the connection behaviour [13][14][15], notably the Component Method now implemented in Eurocode 3 [16].…”