Seismic behavior of interior concretebeam-column joints with non-seismic and limited seismic detailing
Reinforced concrete structures are very common in a region of low to moderate seismicity, and are the predominant structural system in Singapore and Malaysia. Recent post-earthquake investigations indicated that extensive damage occurred as a result of excessive shear deformation and severe stren...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
2009
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/16287 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Reinforced concrete structures are very common in a region of low to moderate
seismicity, and are the predominant structural system in Singapore and Malaysia.
Recent post-earthquake investigations indicated that extensive damage occurred as a
result of excessive shear deformation and severe strength degradation of the beamcolumn
joints in non-seismically detailed frames, thus leading to full collapse of
structures. The BS 8110 code used in Singapore and Malaysia does not specify any
provisions for seismic design or detailing of reinforced concrete structures. Therefore,
it is of great concern that the strength, ductility, and energy dissipation capacity of
these structures may not be adequate to sustain earthquake-induced loads in regions of
low to moderate seismicity. The need for evaluating and improving detailing of
existing structures is obvious.
Two full-scale reinforced concrete interior beam-column joints with non-seismic
detailing and limited seismic detailing were designed and tested to investigate the
seismic behavior of the joints at Nanyang Technological University, Singapore. The
main variables in the test specimens included the amount of joint transverse
reinforcement, the lap splice details for column reinforcement, and the transverse
reinforcement in the beams and columns. Quasi-static cyclic loading simulating
earthquake actions was applied. The non-seismically detailed specimens failed at the
low displacement ductility level, while the limited seismically specimens reached the
limited displacement ductility level. It was demonstrated that even limited seismic
detailing could improve the seismic behavior of the joints. Column main bars lap
spliced within plastic hinge regions were detrimental. The beams and columns were
not severely damaged while shear failure formed in the joints. Implications of the
experimental and analytical evidence were discussed and design recommendations of
beam-column joints were made. |
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