Behavior of Laminated Reinforced Concrete Curved Beam with Changing Concrete Properties

Abstract

Strengthening and upgrading the performance reinforced concrete curved structures for functional purpose as well as for conversation of architectural aesthetic aspect is the main concern for engineers. In the present study, four full-scale experimental Curved Reinforced Concrete (CRC) beams conducted. The cross-section of all CRC beams was T-section. The parametric studies are carried out to investigate the effect of time of casting segmental layers (web and flange) and the compressive strength of concrete on the structural behavior of such structures. Three values of compressive strength of concrete used in this study, these are (25, 50, 75 MPa). The control specimen casting as one unit with the compressive strength of concrete was 25 MPa. The present outcomes showed that the increase in the compressive strength of concrete up to 75 MPa of the flange zone plays a significant role in raising the ultimate capacity by 22.86% and reducing the deflection by 61.43% in the quarter span as compared with control specimen. Additionally, the trend and distribution of cracks, mode of failure, and strain response of CRC specimens are briefly discussed in this study.

Experimental Study on the Structural Behavior of Cast in-situ Hollow Core Concrete Slabs

“…It has been recorded that the performance of buildings with HCRC slabs are not good due to the premature failure of floor in the structural test and highlighted the need of further research in this area [6]. Many researchers have evaluated the capacity of hollow core slab in terms of flexure [5][6][7] web shear [4,5], fire resistance [8], seismic resistance [6,9], torsion [10] and many more, using different formats of hollow core slab systems. The hollow slab provided with PVC pipes and styrophoam, to create cavity in the slab, failed in shear instead of flexure while reducing self-weight up to 24% [7].…”

“…Unlike pre-cast HCRC slab units, the cast in-situ HCRC slab units will provide monolithic construction with supporting structures which will provide axial restraints at the ends. The axial restraints at the ends reduce the chances of shear failure and ductile failure will occur due to flexure [6,9]. Cast in-situ HCRC slab has many advantages over the other slab system, such as no need of elevating equipment, no damage due to placing and handling, rapid construction, low self-weight, economical use of concrete and reliable quality while having almost same flexural behavior as that of conventional slab units [2,4,12].…”