PROGRESSIVE FAILURE ANALYSIS OF MULTI-STOREY REINFORCED CONCRETE BUILDINGS UNDER DIFFERENTIAL SETTLEMENT

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S. A. Alabi
I. A. Arighaye
J. O. Afolayan

Abstract

Multi-Storey buildings are buildings with many floors above the ground floor, which serve as shelters for man, his properties and activities. Most building/ails because they were only designed for normal loads whereas abnormal loads were not considered. Therefore, this paper investigates the potential for progressive failure of multi-storey reiriforced concrete (RC) buildings under chosen varying degrees of settlement ranging between 2 5 mm and 15 0 mm. The computer-based modelling procedure following Alternative Load Path Method is adopted for progressive failure analysis. A 5-typical frame models based on the beams' cross-sectional dimensions were analyzed. Each of the frames is analyzed under the normal loads, combining with the assumed differential settlement. From the results obtained, it is discovered that the potential for progressive failure of a multi-storey RC building increases with the increase in the degree of differential settlement. At 25 mm to 75 mm settlement, vulnerability to progressive failure is very low as the Demand-Capacity-Ratio (DCR) values of the component members are very small, but from I 00 mm settlement and above the structure exhibits high potential for progressive failure. It is also noted that the potential for progressive failure of the structure decreases upwards the building storeys. The potential for progressive failure is higher in the lower floors than in the upper floors. Also, the rigidity of the structure helps in combating progressive failure under differential settlement.

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References

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