Concrete Depth on Moment Capacity of Reinforced Concrete Slab: Safety Performance

Aimed to determine whether structural safety response of reinforced concrete slab will fall short of the code target safety value for flexural system and also determine its relation to moment capacity and minimum flexural reinforcement area requirement in consideration of the influence of un-certainties associated with the design parameters. The randomness of the design parameters makes the present deterministic design overly conservative, as such; it is becoming increasingly difficult to ignore the importance of using reliability approach in structural design application, because of its known advantage in accounting for the inherent variability in both loads and resistance variables. The study examined moment capacity violation and parametric sensitivity analysis with different concrete strengths class and span lengths, subjecting the deterministically designed required slab depth to further decrease and obtained the safety index value using First Order Reliability Method. The results indicate that concrete strength has little influence on minima reinforcement requirement with a value of about 3% surge for 500 mm change in span, which also results in increased ultimate moment of resistance of the concrete section with marginal decline in safety value. Interestingly, the safety value from the reliability analysis with optimized slab depth is well above the target safety limit specified for RC slab.

並列關鍵字

Concrete strength ； depth ； FORM ； moment ； reinforced concrete slab

國際替代計量

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