Comparison of Characteristic Deflection and Serviceability Analysis in Limit State of Deflection of Simply Supported RC Beams

This paper addresses the comparative characteristic deflection and serviceability analysis in limit state of deflection of beam designed for given action in four different ways. The displacement samples for each beam for given loadings conditions, spans, are generated by simulation technique. Obtained samples are modeled with lognormal probability distributions. With the means and standard deviations of the samples, failure probability (total deflection>Span/250) is determined and is checked with failure probability determined by simulation technique. Characteristic deflections in all the four cases are computed. Comparative study of failure probability and characteristic deflections leads to the conclusion that designing the beam as flanged beam than the doubly reinforced beam reduces the failure probability in limit state of deflection to a grater extent further it becomes clear that in case of flanged beam steel provided in tension zone will be more effective in reducing deflection than that in compressive zone.