UBC Theses and Dissertations

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UBC Theses and Dissertations

One sided steel beam connections Starr, Robert Coles

Abstract

The feasibility of one sided beam to column angle connections is dependent on the shear capacity and the behavior of the fasteners employed, since they are eccentrically loaded. Experiments performed show that the column leg rotates somewhat above the lower bolt, partially caused by a compressive friction force developed at the lower part of the connection. Similarly, the web leg rotates somewhat below the gravity axis. The exact rotation centre varies with the applied rotation. Moment vs. rotation curves are plotted for two thicknesses and three connection gauges. These curves enable the determination of the exact end moment developed, and hence the moment on the web bolt group. Tests were performed on the connections in the absence and presence of shear, and shear was found not to affect largely the moment-rotation curves.- Stiffness of the individual set-ups was found to effect the curves more significantly, though in all cases the end moment developed is less than 45% of the central moment of a typical uniformly loaded, simply supported beam. Theoretical moment vs. rotation curves are obtained using derived inelastic functions. These functions are derived from an assumed stress-strain curve which is found to approximate closely the corresponding observed curve. Observed end shear values indicate that the connections tested are feasible, except for the shallower two bolt connection. The remaining connections all developed a minimum of 50% more shear per bolt at slip than permitted by the existing codes.

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