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Structural Behavior of RC Beams Containing Unreinforced Drilled Openings with and without CFRP Strengthening
Faculty
Engineering
Year:
2022
Type of Publication:
ZU Hosted
Pages:
Authors:
Selem Saleh Elsayed Ahmed Dawod
Staff Zu Site
Abstract In Staff Site
Journal:
Polymers https://www.mdpi.com/journal/polymers
Volume:
Keywords :
Structural Behavior , , Beams Containing Unreinforced Drilled Openings
Abstract:
Construction deficiencies can cause serious problems that significantly decrease the design strength of concrete structures, such as the unreinforced drilled openings. With the absence of sufficient reinforcement, the stress concentrations generated around the opening corners produce cracks in the beams. The size and location of the opening significantly affect the behavior of the beam under static and dynamic load. In this work, an experimental and numerical program was performed to investigate the behavior of drilled reinforced concrete beams with and without strengthening using CFRP sheets. Energy absorption and SDOF analyses were performed to preliminary assess the behavior of the beams under the dynamic load, such as blast. One control beam without any openings, six beams with tension-zone openings, and six beams with shear-zone openings were tested. It was found that the samples with tension-zone openings were slightly affected by the opening, where the reduction in the ultimate strength was approximately 7 to 14%. The beams were able to recover up to 46% of the lost strength by CFRP strengthening. On the other hand, the shear-zone opening significantly decreased the strength and energy absorption and increased the blast response. It can be concluded that it is not recommended to drill any opening at the shear zone as strength loss can reach 57% even with the strengthening, especially for blast resisting structure; in addition, the strength recovered from approximately 11.95 to 32.46% only. The finite element model was able to redict the strength of the beams. The results were closer in the case of tension-zone opening than those in the case of the shear-zone opening. Shear cracks were observed at the corners of the openings even if the opening exists at the tension zone. A reduction in the density of cracks can be observed after the strengthening, where the FRP sheet decreases the stress in the concrete
Author Related Publications
Selem Saleh Elsayed Ahmed Dawod, "Mechanical properties of sustainable concrete comprising various wastes", Springer, 2023
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Selem Saleh Elsayed Ahmed Dawod, "Mechanical behavior of concrete at different levels of compressive strength", Fourth International Conference On Civil And Architecture Engineering, 2002
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Selem Saleh Elsayed Ahmed Dawod, "Correlation the effect of beam size and crack-depth ratio in concrete by using a modified stress intensity factor", Al-Mansoura Engineering International Conference, --- , Sharm Elsheikh, EGYP, 2003
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Selem Saleh Elsayed Ahmed Dawod, "Mechanical behavior of high strength concrete reinforced by different types of fibers", Al-Azhar Engineering Seven International Conference, April 2003, Cairo, EGYPT., 2003
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Selem Saleh Elsayed Ahmed Dawod, "Sulfate attack on concrete from mixing and curing water", Al-Azhar Engineering Seven International Conference, April 2003, Cairo, EGYPT., 2004
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Department Related Publications
Eshak Ibrahiem Eshak Hana, "Dynamic Effect of Trains on Multispan Railway Bridges", لايوجد, 1900
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Eshak Ibrahiem Eshak Hana, "Dynamic Effect of Trains on Multispan Railway Bridges", 9th International Colloquium on Structural and Geotechnical Engineering, Ain Shams Univ., Cairo, Egypt, 10-12 April 2001., 2001
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Eshak Ibrahiem Eshak Hana, "Computer Analysis of Cylindrical Tanks Resting on Elastic Foundations", Bulletin of the Faculty of Eng., Cairo University, Paper 7, 1976-1977., 1976
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Eshak Ibrahiem Eshak Hana, "Buckling of Thin Rectangular Plates by Iteration", Al-Azhar Univ., Cairo, 1982
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Eshak Ibrahiem Eshak Hana, "Transverse Moments in Simply Supported Box Girders with Two Overhanging Ends", Scientific Bulletin of the Faculty of Eng., Ain-Shams Univ., No. 17, Vol. 1, 1985., 1985
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