Experimental Study on Bond-Strengthening Hooks for RC Beams
Source abstract
Abstract
This paper presents an experimental investigation of bond-strengthening hooks as a new method to increase bond strength along flexural reinforcing bars in reinforced concrete (RC) beams. The proposed method attempts to increase confining stiffness around the flexural bars by placing U-shaped hooks and to prevent premature bond splitting failure. Ten specimens with different numbers and sizes of hooks were prepared to verify the strengthening effectiveness under monotonic four-point loading. The test results indicated that the hooks increased the bond strength along flexural bars although the strengthening effectiveness was limited by the effective number of anchors of hooks Nbe. This limit is determined by the size of the stress-transmitting zones of the concrete around the anchors of the hooks. The bond-strengthening effectiveness of hooks was found to be equivalent to that of conventional internal ties.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Structural Behavior of Reinforced Concrete · Concrete Corrosion and Durability · Structural Load-Bearing Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Dept. of Urban and Environmental Engineering, Kyoto University, Kyoto, Japan.
Mitoyo-sangyo Corporation, Kagawa, Japan.
Neturen Corporation, Tokyo, Japan.
References (9)
Show source-provided references
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2. AIJ (1999). Design Guidelines for Earthquake Resistant Reinforced Concrete Buildings Based on Inelastic Displacement Concept. Architectural Institute of Japan, 138-192.
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4. Fujii, S., Morita, S., Goto, S., Konishi, T. and Yoshimi, K. (1981). “Evaluation of bond splitting strength.” Annu. Rep. Architectural Institute of Japan, Kinki Branch, 197-204. (in Japanese)
5. Hosokawa, M., Sato, Y., Nagatomo, K. and Nakamura, Y. (2003). “Reinforcement for RC columns with ultra-high-strength spiral and hook-shaped bars.” Proceedings of Japan Concrete Institute, 25(2), 865-870. (in Japanese)
6. Nagatomo, K., Kim, K., Sato, Y. and Kamitani, K. (2003). “Reinforcement for RC beams with ultra-high-strength spiral and hook-shaped bars.” Proceedings of Japan Concrete Institute, 25(2), 859-864. (in Japanese)
7. Sato, Y., Nagatomo, K. and Nakamura, Y. (2003). “Bond-Strengthening Hooks for RC Members with 1300 MPa-Class Shear-Reinforcing Spirals.” Journal of Asian Architecture and Building Engineering, 2(2), 7-14.10.3130/jaabe.2.b7 ↗
8. Sato, Y., Nagatomo, K. and Nakamura, Y. (2006). “Bond-Strengthening Hooks for RC Members with 1300 MPa-Class Shear-Reinforcing Spirals Part II Shear Strength Estimation Based on the BCJ-C1166 Guideline.” Journal of Asian Architecture and Building Engineering, 5(2), 317-324.10.3130/jaabe.5.317 ↗
9. Tanaka, M., Nagatomo, K., Sato, Y. and Kaku, T. (2004). “Bond Behavior of Main Bars in Shear Spans of RC Beams with Hooks and Ultra-High-Strength Spirals.” Proceedings of Japan Concrete Institute, 26(2), 829-834. (in Japanese)