Structural shear retrofitting of reinforced concrete beam: multilayer ferrocement technique
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ORIGINAL PAPER
Structural shear retrofitting of reinforced concrete beam: multilayer ferrocement technique Imrose Bin Muhit1 · Nur‑E‑Tanjina Jitu2 · Md. Rabiul Alam2 Received: 18 May 2020 / Accepted: 7 September 2020 © Springer Nature Switzerland AG 2020
Abstract Most of the existing buildings in developing countries lack proper reinforcement and are in danger of collapse under seismic and extreme events. Therefore, a sustainable and feasible retrofitting technique is necessary to ensure the safety of the infrastructure and its occupants. This paper describes a broad experimental programme, in which a total of 20 reinforced concrete beams with shear deficiency were constructed, 4 of them considered as control beam, while the rest of the beams were retrofitted with ferrocement in four different techniques after loading up to initial crack. All the specimens were tested up to the failure, and beam deflection at different points along with the load versus displacement response was recorded for each case. It allowed the determination of elastic stiffness, peak strength and associated displacement capacity of the retrofitted beam, compared with control beams. From the observed results, a plausible technique of retrofitting using ferrocement is suggested. A preliminary finite element model is developed for future study, which compared the experimental and FE results. Keywords Shear failure · Retrofitting · Ferrocement · Reinforced concrete · Technique
Introduction For the last 50 years, reinforced concrete is being used frequently not only in the developed part of the world, but also in faraway places in the developing countries. In Bangladesh, usage of reinforced concrete with masonry wall is the most common building feature for urban dwelling (Ahsan 2016). However, lack of appropriate building code, improper design, less effective techniques, and frequent changes in the usage of the building (commonly residential buildings turned into commercial and industrial buildings) make the structure susceptible to collapse or impose life threat, even before the intended service life of the building expires. Such unserviceable building structures need immediate attention, as in most cases owners are reluctant to demolish the building due to financial constraints. However, some of these vulnerable structures have historical importance and * Imrose Bin Muhit [email protected] 1
Centre for Infrastructure Performance and Reliability, The University of Newcastle, Callaghan, NSW 2308, Australia
Department of Civil Engineering, Chittagong University of Engineering and Technology, Chittagong 4349, Bangladesh
2
cultural heritage (Huq et al. 2017); therefore, demolition is not a pertinent option for these buildings. Moreover, due to inconvenience related to the demolition or complete structural replacement, like high material and labour cost, environmental pollution, and traffic congestion in narrow roads, often retrofitting considered as an effective and cost-efficient solution (Dias and Barros 2005; Cardone et al
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