Abstract
AbstractWhen using single‐end tensioned carbon‐fiber reinforced polymer (CFRP) fabric to strengthen reinforced concrete (RC) columns, the contact length between CFRP fabric and column increases with the increase in column diameter, and the prestress losses are often very large at the distance farthest from the anchorage. To address the problem, a method for double‐end transverse prestressing of CFRP fabric for strengthening large diameter RC columns is proposed in this paper. Tests were carried out on 20 RC column specimens strengthened with prestressed CFRP fabric in constant temperature and humidity. The prestress losses due to friction during the tensioning process and the prestress losses in CFRP fabric during load holding were analyzed. A theoretical formula for the CFRP fabric prestress losses was established. The test results revealed that compared to single‐end tensioning, double‐end tensioning of CFRP fabric can effectively reduce the average friction loss ratio. The friction loss ratio in large‐diameter columns is more significant than that in small‐diameter ones. Applying epoxy coating to the column surface can reduce the prestress loss ratios due to friction and CFRP fabric retraction. The latter can also be effectively reduced by repeated tensioning. The prestress losses calculated using the formula proposed in this paper were in good agreement with the measured data.
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