Utilizing Experimental Compressive Strength to Assess Mid-Span Deflection in Reinforced Concrete Beams Using Robot Structural Analysis Software

Abstract

This study investigates the relationship between compressive strength and mid-span deflection of reinforced concrete beams, as determined through experimental tests and numerical modelling. Six commonly used concrete classes in Morocco (C10, C15, C20, C25, C30, C35) were prepared and tested to evaluate their mechanical performance. The obtained compressive strength values were incorporated into numerical models created using Robot Structural Analysis software, enabling the simulation of beam behaviour under uniform distributed load. Experimental results confirm that the compressive strength values comply with Moroccan standard NM 10.1.051, and they are strongly influenced by the paste volume and the water–cement (w/c) ratio. Moreover, the presence of superplasticizer helps to maintain workability by prolonging the slump. The findings indicate that mid-span deflection increases with compressive strength, highlighting the close connection between material properties and structural response. This approach demonstrates the value of combining laboratory experimentation with numerical modelling to bridge the gap between academic practice and real-world applications in civil engineering.