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Earthquakes and Structures Volume 9, Number 5, November 2015 , pages 999-1028 DOI: https://doi.org/10.12989/eas.2015.9.5.999 |
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Parameters affecting the fundamental period of infilled RC frame structures |
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Panagiotis G. Asteris, Constantinos C. Repapis, Athanasios K. Tsaris, Fabio Di Trapani and Liborio Cavaleri
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| Abstract | ||
| Despite the fact that the fundamental period appears to be one of the most critical parameters for the seismic design of structures according to the modal superposition method, the so far available in the literature proposals for its estimation are often conflicting with each other making their use uncertain. Furthermore, the majority of these proposals do not take into account the presence of infills walls into the structure despite the fact that infill walls increase the stiffness and mass of structure leading to significant changes in the fundamental period numerical value. Toward this end, this paper presents a detailed and in-depth analytical investigation on the parameters that affect the fundamental period of reinforce concrete structure. The calculated values of the fundamental period are compared against those obtained from the seismic code and equations proposed by various researchers in the literature. From the analysis of the results it has been found that the number of storeys, the span length, the stiffness of the infill wall panels, the location of the soft storeys and the soil type are crucial parameters that influence the fundamental period of RC buildings. | ||
| Key Words | ||
| fundamental period; infilled frames; masonry; modal analysis; reinforced concrete buildings | ||
| Address | ||
| Panagiotis G. Asteris, Athanasios K. Tsaris: Computational Mechanics Laboratory, School of Pedagogical and Technological Education, Heraklion, GR 14121, Athens, Greece Constantinos C. Repapis: Department of Civil Engineering, Piraeus University of Applied Sciences, 250 Thivon and Petrou Ralli Str., Aigaleo 122 44, Athens, Greece Fabio Di Trapani and Liborio Cavaleri: Department of Civil, Environmental, Aerospace and Materials Engineering (DICAM), University of Palermo, Viale delle Scienze, 90128, Palermo, Italy | ||