Abstract
This work aims at presenting detailed procedures companied by numerical examples for analyzing and designing reinforced concrete deep beams that subjected to non-central loadings based on Strut and Tie method (STM). The subjected loadings were moved from the center of the beam span towards the supports reaching the maximum non-centrality could be achieved (after which the beams became ‘not deep’ from ACI 318M-14 point of view). A total of three deep beams with three different types of loadings were taken into considerations; one concentrated force, two concentrated forces and uniformly distributed load. Every specimen had a cross section of 150 400 mm and a total length of 1000 mm. Generally, it was found that moving load from the span center towards one of the supports leads to worth notable decreases in the beam ultimate capacity. Therefore, in the case of one-concentrated force, the ultimate load capacity decreased by 30.2% when left shear span to effective depth ratio (aL/d) decreased from 1.3 to 0.65. While in the cases of two-concentrated forces or uniformly distributed loading, it was found that changing (aL/d) ratio from 1.02 to 0.37 led to decrease the deep beam ultimate capacity by 30.5%.
Highlights
Deep beams are members that loaded on one face and supported on the opposite face such that strut-like compression elements can develop between the loads and supports to satisfy (a) or (b) [1]: (a) Clear span ln does not exceed four times the overall member depth h. (b) Concentrated loads exist within a distance 2h from the face of the support
Detailed prediction procedures for RC deep beams that subjected to different non-central loadings are presented here
The effect of load non-centrality is investigated in this study
Summary
Deep beams are members that loaded on one face and supported on the opposite face such that strut-like compression elements can develop between the loads and supports to satisfy (a) or (b) [1]:. The capacity of a structure as estimated by a lower bound theory will be less than or equal to the real failure load of the body in question [11]. Strut and tie model is a very useful tool for analyzing and designing reinforced concrete members in which D-regions exist. That is why this article investigates modeling in detail the struts and ties in the reinforced concrete deep beams under various non-central loading cases. An emerging methodology for the design of all types of D-regions is to predict and design an internal truss This truss is consisting of steel tension ties and concrete compressive struts that are interconnected at nodes, to support the imposed loading through the regions of discontinuity.
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