Strengthening of continuous low strength RC U-Shaped beams using different techniques | ||||
| International Journal of Advances in Structural and Geotechnical Engineering | ||||
| Volume 03, Issue 04 - Serial Number 3062019, November 2019, Page 58-74 | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/asge.2019.271030 | ||||
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| Abstract | ||||
| In this paper, different strengthening techniques have been implemented in order to enhance both flexural and shear strengths at the intermediate support of continuous RC beams made of low strength concrete. Four two-equal span continuous RC beams made of concrete strength of target cube strength of about 18 MPa have been prepared and cast of u-shaped cross-sections. One beam was control un-strengthened beam, while the remaining beams were strengthened using three different techniques; namely, Externally Bonded Carbon Fiber Reinforced Polymer (EB-CFRP) sheets, external thin layer of Engineered Cementitious Composites (ECC) material and externally bonded steel plates. All strengthening materials were applied at the intermediate support and extended between the mid-span points at both sides. All beams have the same concrete dimensions and internal reinforcement detailing. The overall cross-sectional dimensions were 600mm width by 330mm total depth and 2100mm center-to-center span. For the mid-span sections and away from the supporting points, the cross section was u-shaped of 80mm flange thickness and 100mm web thickness. The experimental test results showed that all strengthened beams showed increased sustain loads by about 94%, 103% and 123% respectively, for strengthened beams by EB-CFRP sheets, ECC material and steel plates compared to that of the un-strengthened beam. Thus, the strengthening technique based on steel plates exhibited the outermost ultimate capacity. On the other hand, the strengthening technique based on ECC material enabled the strengthened beam to show about 96% of the ductility index for un-strengthened beam. | ||||
| Keywords | ||||
| Low strength concrete; Continuous beams; U-shaped cross-section; Strengthening; Carbon Fiber Reinforced Polymer (CFRP); Engineered Cementitious Composites (ECC); Steel plate | ||||
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