Comparative analysis of collapse loads of slabs supported on orthogonal Sided frames with beam/column joint fixed

Osuji SO* and Adhekoyibo LO

This research evaluates the collapse loads of slab supported on orthogonal sided frames with beam/ column joint fixed. Two frame models were investigated (one with moment of resistance of slab (MRS) > moment of resistance of beam (MRB) and the other with moment of resistance of slab (MRS) < moment of resistance of beam (MRB).

A reinforced concrete prototype of 3m×3m× 3m frame with a reduction factor of 3 was designed and constructed. A model of it constructed and cast with a micro concrete of 1:6 mix ratio. The models were allowed to cure for 28days before being loaded directly until collapse. Loading of the RC frame model was done by a fabricated loading box of 1.0 ×1.0×3.0m size place on top of its slab. Sands were poured into the panel using head pans. The weight of sand on each head pans (1.84KN). Two dial gauges were used; one was set at the center of the bottom of the slab while the other was set below the center of the bottom of the beam to monitor and measure the deflection at ten head pans of sand.

The estimated collapse load for slab and beam were 20.36kn/m and 52.27kn/m respectively. The actual collapse loads for MRS > MRB and MRS < MRB frame models were 69.04kn/m and 49.68kn/m respectively. The frame model failed by flexural failure at the beams/column joints. The actual collapse load of 69.92kn and 49.68kn respectively were greater than that of the estimated collapse loads of beam and slab comparably. Also the MRS > MRB frame model is stronger than that of the MRS < MRB frame model.

Keywords: Moment of resistance force; Collapse loadl; Slap; Beam

Published on: Mar 14, 2018 Pages: 13-19

Full Text PDF Full Text HTML DOI: 10.17352/2455-488X.000021
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