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Earthquakes and Structures Volume 1, Number 1, March 2010 , pages 93-108 DOI: https://doi.org/10.12989/eas.2010.1.1.093 |
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Seismic evaluation of existing RC frames with wide beams using an energy-based approach |
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A. Benavent-Climent and R. Zahran
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| Abstract | ||
| This paper investigates the seismic performance of existing reinforced concrete frames with wide beams mainly designed for gravity loads, as typically found in the seismic-prone Mediterranean area before the introduction of modern codes. The seismic capacity is evaluated in terms of the overall amount of input energy that the frame can dissipate/absorb up to collapse. This approach provides a quantitative evaluation that can be useful for selecting and designing an appropriate retrofit strategy. Six prototype frames representative of past construction practices in the southern part of Spain are designed, and the corresponding non-linear numerical models are developed and calibrated with purposely conducted tests on wide beamcolumn subassemblages. The models are subjected to sixteen earthquake records until collapse by applying the incremental dynamic analysis method. It is found that the ultimate energy dissipation capacity at the story level is markedly low (about 1.36 times the product of the lateral yield strength and yield displacement of the story), giving values for the maximum amount of energy that the frame can dissipate which are from one fourth to half of that required in moderate-seismicity regions. | ||
| Key Words | ||
| seismic performance; existing frames; energy dissipation capacity; wide beams. | ||
| Address | ||
| A. Benavent-Climent: Department of Structural Mechanics, University of Granada, Edificio Politecnico, 18071 Granada, Spain R. Zahran: Department of Structural Mechanics, University of Granada, Edificio Politecnico, 18071 Granada, Spain | ||