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Journal : journal of the civil engineering forum

Structural Evaluation of Reinforced Concrete Beams Retrofitted using Cold-Formed Steel Plates Susanto, Ambar; Wusqo, Urwatul; Zakiyyah, Amirah; Puspitasari, Ira; Kasyanto, Heri; Oesman, Mardiana; Susilahadi
Journal of the Civil Engineering Forum Vol. 12 No. 2 (May 2026)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.24631

Abstract

Shear strengthening of reinforced concrete (RC) beams has become increasingly important for improving the safety and durability of existing structures. This study focuses on the behavior of RC beams strengthened using cold-formed steel plates installed diagonally at a 45-degree angle. Two beam specimens with dimensions of 250 × 400 × 1500 mm were tested under continuous loading: a control beam (B0) without strengthening and a strengthened beam (B1) with a single cold-formed steel plate bonded to the beam web. Additionally, a Linear Variable Differential Transformer (LVDT) was installed at midspan, ¼ span, and ¾ span to monitor deflections, with all instrumentation connected to a data acquisition system. Test results showed that the initial yielding load for the control specimen B0 was 283.07 kN, while the strengthened specimen B1 yielded at 288.91 kN, indicating a 2.44% increase in initial yield load due to the presence of the cold-formed steel plate. Loading was continued up to 350 kN, at which point the midspan deflection of B0 was measured at 21.40 mm, whereas B1 exhibited a lower deflection of 17.81 mm, demonstrating improved stiffness and reduced deformation. The shear capacity of the beams, which includes contributions from both the concrete and shear reinforcement, was calculated as 145.59 kN. This shear capacity corresponded to a total applied load of 291.18 kN, marking the limit at which shear failure is expected to occur. The cracks on the both left and right side of the beams seem symmetrically and there is no separation between the concrete and the cold-formed steel plates. The study confirms that retrofitting RC beams with diagonally installed cold-formed steel plates can effectively enhance their shear capacity and stiffness. This strengthening technique offers a practical and efficient method for extending the service life of existing concrete structures.
Co-Authors Abd Raihan Achmad Djunawan Ahmad Syamsul Falah Akhbar, Try Kurniawan Ambar Susanto, Ambar Ani Media Harumi Anip Febtriko, Anip Annisah, Annisah Aprila, Nila Arini Zulfaida Arisandi, Diki Atmaranti, Salsabila Devina Badrus Zaman Citra Nurina Prabiantissa Denny Adi Prasetyo Dwi Purwanti Edy Haryanto Endro Yulianto Enny Mar’atus Sholihah Ervi Husni, Ervi Fadhillah, Muhamad Fikri Fahmi, Moh Farih Fandhilah Fandhilah FATIMAH FATIMAH Febdian Rusydi Ferry Kriswandana Fetreo Negeo Putra Firstiana, Amelia Fitri Noor Febriana Ginarsih, Yuni Harlina . Heri Kasyanto, Heri Heryanto Adi N Hilmi Yumni I Dewa Gede Hari Wisana Imam Sarwo Imam Yuadi Irianti, Rosi Irwan Sulistio Isfentiani, Dina Isnanto Juliana Christyaningsih Kurniawan Akhbar, Try Laura Navika Yamani Lengari, Cristiany Gunu Liliek Soetjiatie Luthfi Rusyadi Maftahatul Hakimah, Maftahatul Mahendra, Victoria Lucky Mamat Supriyono Melania Rizerda Pebianti MINARTI Moch. Dicky Riza Muchtar muchtar Muflih, Moch. Imam Nanang Fakhrur Rozi Ni Made Suci Sukmawati Noorminshah A. Iahad Novita Sari Nurdin, Muhamad Irfan Nurdin, Muhammad Irfan Nurhazizah, Elwin Dewi Oesman, Mardiana Pakage , Ferdinant Pradhana, Andrea Thrisiawan Purbandini Soeparman, Purbandini Puspita Zella Wigati Putra, Danang Adi Rahmatullah, Ridhwan Muhammad Fauzan Retno Sasongko Wati Riawan Gunadi Rokhmalia, Fitri Rousyati Rousyati Sari, Ira Rahayu Tiyar Sembiring, Rinawati Setiawan, Ainur Rahim Sherly Jeniawaty Sinaga, S. Bungaran Siti Mar'atus Siti Masitoh Slamet Wardoyo SRI UTAMI Sulistyowati, Dwi Wahyu Wulan Susilahadi Susilo, Tri Achmad Budi Suyoso, Aldo Lovely Arief Tatarini Pipit Ika Cahyani Taufiqurrahman Tries Edy Wahyono ulfa hidayah Upin, La Ode Widjanarko , Bambang Wijayati, Indah Oktari Wusqo, Urwatul Wyssie Ika Sari Yasin, Affan Zaidulfar, Harianto Zakiyyah, Amirah Zidny, Irvan