科研之友
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摘要
An experimental study was carried out to investigate the effect on the bond strength of the number of bars in a bundle, embedded length, and bar size of bundle bars grouted in ducts for connections of precast concrete elements. The study included 14 pullout tests on two- and three-bar bundles grouted in corrugated strip metal ducts. Yielding of the bars was reached with embedded lengths ranging from 11d(b) to 13d(b) for three-bar bundles and 9d(b) to 11d(b) for two-bar bundles. Results demonstrated that the reduction of contact perimeter due to bundling can be estimated by the maximum perimeter in contact of the bars with the surrounding grout. Moreover, there is a debonding length near the loaded end of the anchored reinforcement that increases with the number of bars per bundle. Based on the experimental results, an anchorage length expression for bundled bars grouted in ducts is proposed.
- 出版日期2018-4
