Effect of Position of Opening in RC Beams Subjected to Flexure and Shear
Authors: Gupta Abhinav 
Published: January 2023

Abstract: The provision of transverse openings in floor beams to facilitate the passage of utility pipes and service ducts results not only in a more systematic layout of pipes and ducts, it also translates into substantial economic savings in the construction of a multi-storey building. To investigate the problem of openings in beams, the author initiated a research program in the early 1980s. Since then extensive research has been carried out giving a comprehensive coverage on both circular and large rectangular openings under various combinations of bending, shear and torsion. In this paper, major findings relevant to the analysis and design of such beams under the most commonly encountered loading case of bending and shear are extracted and summarized. An attempt has been made to answer the frequently asked questions related to creating an opening in an already constructed beam and how to deal with multiple openings. It has been shown that the design method for beams with large openings can be further simplified without sacrificing rationality and having unreasonable additional cost. In this research work, we analyzed the effect of position of opening in RCC beams subjected to combined flexure and shear by checking their effects on the shear and bending behavior of the beams. The considered parameters for the study are loaddeflection curve, the shape of the cracks, and the stress distribution. Grade of concrete taken as M-25. Cross-section of reinforced concrete beam is 0.15 x 0.15 x 0.70 m with circular opening of 0.09 m diameter is considered. In this study, total five numbers of specimens were tested. The parameters are: Two types of specimens considered as without opening and three types of specimens considered as with Opening at different locations, In one specimen we took opening at the left corner of beam and in other specimen, we took opening at the right corner of the beam and In One specimen we took opening in both the corners. Stirrups were used in this study to get more accurate result. The results were validated by compare the experimental test results by UTM against the software analysis results using ANSYS software and we found that reinforced concrete beams with openings of different horizontal location and reported that placing holes in flexure zone has lesser impact on the beam performance compared to when the castellation are placed in the shear zone. This study is focused on the flexure and shear behavior of beam with different openings and their parameters like Deformation, Load-Deflection, and Crack Pattern. Abstract: The provision of transverse openings in floor beams to facilitate the passage of utility pipes and service ducts results not only in a more systematic layout of pipes and ducts, it also translates into substantial economic savings in the construction of a multi-storey building. To investigate the problem of openings in beams, the author initiated a research program in the early 1980s. Since then extensive research has been carried out giving a comprehensive coverage on both circular and large rectangular openings under various combinations of bending, shear and torsion. In this paper, major findings relevant to the analysis and design of such beams under the most commonly encountered loading case of bending and shear are extracted and summarized. An attempt has been made to answer the frequently asked questions related to creating an opening in an already constructed beam and how to deal with multiple openings. It has been shown that the design method for beams with large openings can be further simplified without sacrificing rationality and having unreasonable additional cost. In this research work, we analyzed the effect of position of opening in RCC beams subjected to combined flexure and shear by checking their effects on the shear and bending behavior of the beams. The considered parameters for the study are loaddeflection curve, the shape of the cracks, and the stress distribution. Grade of concrete taken as M-25. Cross-section of reinforced concrete beam is 0.15 x 0.15 x 0.70 m with circular opening of 0.09 m diameter is considered. In this study, total five numbers of specimens were tested. The parameters are: Two types of specimens considered as without opening and three types of specimens considered as with Opening at different locations, In one specimen we took opening at the left corner of beam and in other specimen, we took opening at the right corner of the beam and In One specimen we took opening in both the corners. Stirrups were used in this study to get more accurate result. The results were validated by compare the experimental test results by UTM against the software analysis results using ANSYS software and we found that reinforced concrete beams with openings of different horizontal location and reported that placing holes in flexure zone has lesser impact on the beam performance compared to when the castellation are placed in the shear zone. This study is focused on the flexure and shear behavior of beam with different openings and their parameters like Deformation, Load-Deflection, and Crack Pattern.