Structural Performance Under Monotonic Static Loading of Reinforced Concrete Gable Roof Beams with Multiple Web Openings
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RESEARCH PAPER
Structural Performance Under Monotonic Static Loading of Reinforced Concrete Gable Roof Beams with Multiple Web Openings Maryam Abdul Jabbar Hassan1 • Amer Farouk Izzet2
•
Nazar K. Oukaili2
Received: 22 June 2020 / Revised: 29 August 2020 / Accepted: 2 October 2020 Ó Iran University of Science and Technology 2020
Abstract In the present study, an attempt has been made to experimentally investigate the flexural performance of ten simply supported reinforced concrete gable roof beams, including solid control specimen (i.e., without openings) and nine beams with web openings of different dimensions and configurations. The nine beams with openings have identical reinforcement details. All beams were monotonically loaded to failure under mid-span loading. The main variables were the number of the created openings, the total area of the created openings, and the inclination angle of the posts between openings. Of interest is the load-carrying capacity, cracking resistance and propagation, deformability, failure mode, and strain development that represent the behavior of reinforced concrete gable beams. Test results showed that the total concrete weight consumed for the tested gable beams with openings was lower than the solid gable beam by (14.9–26%). This reduction in weight led to a reduction in the flexural stiffness and, in turn. in the load-carrying capacity by (6.2–17.9%). The percentage of the decrease in the concrete consumption to the reduction in the load-carrying capacity for the tested beams with openings attained (140–240%). It was recorded that the maximum crack width depended on the total area of the created openings rather than the number of these openings. Keywords Flexural performance Gable roof beams Openings Vertical posts Inclined posts
1 Introduction The presence of openings in gable beams is essential to provide a convenient passage of service ducts and conduits and has an important advantage in reducing the overall weight of the beam which improve the demand on the supporting frames both under gravity loading and seismic excitation that resulting in a major cost-saving [1]. The insertion of openings in a solid beam would directly affect & Amer Farouk Izzet [email protected] & Nazar K. Oukaili [email protected] Maryam Abdul Jabbar Hassan [email protected] 1
Department of Designs and Engineering Consultancy, Ministry of Transportation, State Company for Implementation of Transport Projects, Baghdad, Iraq
2
Department of Civil Engineering, University of Baghdad, Baghdad, Iraq
the performance of RC beams resulting in a more complicated behavior as the opening would essentially cause a sudden drop in the beam cross-sectional area and in turn the overall stiffness. At the same time, the corners of opening would be subjected to a high concentration of stresses that could result in extensive cracking which is inadmissible from anesthetic and durable point of view. In addition,
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