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Structural Engineering and Mechanics Volume 15, Number 2, February 2003 , pages 181-198 DOI: https://doi.org/10.12989/sem.2003.15.2.181 |
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Nonlinear behavior of deep reinforced concrete coupling beams |
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Z.Z. Zhao and A.K.H. Kwan
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| Abstract | ||
| Six large scale models of conventionally reinforced concrete coupling beams with span/depth ratios ranging from 1.17 to 2.00 were tested under monotonically applied shear loads to study their nonlinear behavior using a newly developed test method that maintained equal rotations at the two ends of the coupling beam specimen and allowed for local deformations at the beam-wall joints. By conducting the tests under displacement control, the post-peak behavior and complete load-deflection curves of the coupling beams were obtained for investigation. It was found that after the appearance of flexural and shear cracks, a deep coupling beam would gradually transform itself from an ordinary beam to a truss composed of diagonal concrete struts and longitudinal and transverse steel reinforcement bars. Moreover, in a deep coupling beam, the local deformations at the beam-wall joints could contribute significantly (up to the order of 50%) to the total deflection of the coupling beam, especially at the post-peak stage. Finally, although a coupling beam failing in shear would have a relatively low ductility ratio of only 5 or even lower, a coupling beam failing in flexure could have a relatively high ductility ratio of 10 or higher. | ||
| Key Words | ||
| reinforced concrete; coupling beams; shear walls. | ||
| Address | ||
| Department of Civil Engineering, Tsinghua University, Beijing, China Department of Civil Engineering, The University of Hong Kong, Hong Kong SAR, China | ||