Abstract
In this study experimental tests were conducted to investigate the behavior of reinforcedconcrete deep beam with openings using lightweight concrete. The experimental programinvolved of testing thirteen simply supported deep beam specimens which tested under statictwo-point loads. Light expanding clay aggregate (LECA) was used to produce lightweightconcrete. Test variables were the shape and size of openings, reinforcement around theopenings, position of the openings and shear span to depth ratio. It was found that thebehavior of deep beams which made of lightweight concrete is similar to that made of normalconcrete. It was concluded that the ultimate load and the measured maximum deflection inbeams that have circular openings are larger compared to that have rectangular openings. Atthe same time, the ultimate load decreased and the measured values of maximum deflectionincreased with increasing the size of the openings in deep beams. Also, it was found thatproviding steel reinforcement around the openings caused an increasing in the load capacityof the tested beams. Decreasing the shear span ratio from 0.5 to 0.4 caused an increasing inthe ultimate load and the measured maximum deflection.
Highlights
Reinforced concrete deep beams are practically universal structural members
The test program consisted of two groups; 1) Control beams with lightweight concrete using of Light expanding clay aggregate (LECA) named in symbol (LW). 2) Test beams consist of twelve beams; the variables were the effect of the shape of openings, the effect of the position of the openings, the effect of shear span ratio, the effect of reinforcement of steel bars around the opening, and the effect of the size of the openings
LECA used in saturated surface dry (SSD) condition so it covered with water for 1 day before mixing
Summary
Reinforced concrete deep beams are practically universal structural members. Deep beams differ from the other flexural members because they behave as two-dimensional instead of one-dimensional members and subjected to two-dimensional conditions of stresses This variation in behavior is mainly caused from the significant effects of vertical normal stresses and shear deformations in these members [2]. Structural lightweight concrete mixtures could be designed to attain strengths values close to that of normal weight concrete. Lightweight concrete gives a more efficient strength-to-weight ratio in structural members. Present study meant to investigate the behavior of reinforced concrete deep beam with openings using lightweight concrete. Tests were carried out on thirteen reinforced concrete deep beams with opening using light weight aggregate for this purpose. The parameters studied were; shear span to depth ratio, opening size, opening shape, opening position, reinforcement around the opening
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