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Structural Engineering and Mechanics Volume 72, Number 3, November10 2019 , pages 367-382 DOI: https://doi.org/10.12989/sem.2019.72.3.367 |
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Strain penetration of high-strength steel bars anchored in reinforced concrete beam-column connections |
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Ling Li, Wenzhong Zheng and Ying Wang
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| Abstract | ||
| This paper presents experimental and analytical investigations on additional fixed-end rotations resulting from the strain penetration of high-strength reinforcement in reinforced concrete (RC) beam-column connections under monotonic loading. The experimental part included the test of 18 interior beam-column connections with straight long steel bars and 24 exterior beam-column connections with hooked and headed steel bars. Rebar strains along the anchorage length were recorded at the yielding and ultimate states. Furthermore, a numerical program was developed to study the effect of strain penetration in beam-column connections. The numerical results showed good agreement with the test results. Finally, 87 simulated specimens were designed with various parameters based on the test specimens. The effect of concrete compressive strength (fc), yield strength (fy), diameter (db), and anchorage length (lah) of the reinforcement in the beam-column connection was examined through a parametric study. The results indicated that additional fixed-end rotations increased with a decrease in fc and an increase in fy, db and lah. Moreover, the growth rate of additional fixed-end rotations at the yielding state was faster than that at the ultimate state when high-strength steel bars were used. | ||
| Key Words | ||
| reinforced concrete; bond-slip; strain penetration; numerical analysis; fixed-end rotation | ||
| Address | ||
| Ling Li, Wenzhong Zheng and Ying Wang:School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China; Wenzhong Zheng: Key Lab of Structures Dynamic Behaviour and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China; 3Key Lab Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China | ||