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Structural Engineering and Mechanics Volume 76, Number 3, November10 2020 , pages 279-291 DOI: https://doi.org/10.12989/sem.2020.76.3.279 |
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New optimum distribution of lateral strength of shear-type buildings for uniform damage |
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Jesús Donaire-Ávila, Andrea Lucchini, Amadeo Benavent-Climent and Fabrizio Mollaioli
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| Abstract | ||
| The seismic design of conventional frame structures is meant to enhance plastic deformations at beam ends and prevent yielding in columns. To this end, columns are made stronger than beams. Yet yielding in columns cannot be avoided with the column-to-beam strength ratios (about 1.3) prescribed by seismic codes. Preventing plastic deformations in columns calls for ratios close to 4, which is not feasible for economic reasons. Furthermore, material properties and the rearrangement of geometric shapes inevitably make the distribution of damage among stories uneven. Damage in the i-th story can be characterized as the accumulated plastic strain energy (Wpi) normalized by the product of the story shear force (Qyi) and drift (δyi) at yielding. Past studies showed that the distribution of the plastic strain energy dissipation demand, Wpi /ΣWpj, can be evaluated from the deviation of Qyi with respect to an “optimum value” that would make the ratio Wpi/(Qyiδyi)—i.e. the damage—equal in all stories. This paper investigates how the soil type and ductility demand affect the optimum lateral strength distribution. New optimum lateral strength distributions are put forth and compared with others proposed in the literature. | ||
| Key Words | ||
| optimum strength distribution; damage distribution; energy-based method; multistory shear-type buildings | ||
| Address | ||
| 1 Department of Mechanical and Mining Engineering, University of Jaén, Cinturón Sur s/n, 23700-Linares (Jaén), Spain 2 Department of Structural and Geotechnical Engineering, Sapienza University of Rome, Via Gramsci 53, 00197 Rome, Italy 3 Department of Mechanical Engineering, Universidad Politécnica de Madrid, José Gutiérrez Abascal 2, 28006 Madrid, Spain | ||