On the Distribution in Height of Base Shear Forces in Linear Static Analysis of Base-Isolated Structures
1
Department of Civil Engineering, University of Salerno, 84084 Fisciano, Italy
2
Department of Structural Engineering, University of California, San Diego, CA 92093-0085, USA
*
Author to whom correspondence should be addressed.
Buildings 2020, 10(11), 197; https://doi.org/10.3390/buildings10110197
Received: 28 September 2020 / Revised: 27 October 2020 / Accepted: 29 October 2020 / Published: 1 November 2020
(This article belongs to the Special Issue Structural Analysis for Earthquake-Resistant Design of Buildings)
Although base isolation is nowadays a well-established seismic-protection technique for both buildings and bridges, and several issues are still open and attract the interest of the research community. Among them, the formulation of computationally efficient and accurate analysis methods is a relevant aspect in structural design of seismic-isolated buildings. In fact, codes and guidelines currently in force in various parts of the world generally include the possibility for designers to utilize linear-elastic analysis methods based on equivalent linearization of the non-linear force-displacement response of isolators. This paper proposes a formula for defining the force distribution in height that should be considered in linear-static analyses to obtain a more accurate approximation of the actual structural response, supposedly simulated by means of non-linear time history analysis. To do that, it summarizes the results of a wide parametric analysis carried out on a batch of structures characterized by three different heights and various properties of base isolators. The reported results highlight that the equivalent static force distribution provided by both Italian and European codes tend to underestimate the actual seismic lateral forces acting on base-isolated buildings, whereas the inverted triangular distribution, proposed in various American codes and standards, is often conservative.
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MDPI and ACS Style
Zinco, A.; Fraternali, F.; Benzoni, G.; Martinelli, E. On the Distribution in Height of Base Shear Forces in Linear Static Analysis of Base-Isolated Structures. Buildings 2020, 10, 197. https://doi.org/10.3390/buildings10110197
AMA Style
Zinco A, Fraternali F, Benzoni G, Martinelli E. On the Distribution in Height of Base Shear Forces in Linear Static Analysis of Base-Isolated Structures. Buildings. 2020; 10(11):197. https://doi.org/10.3390/buildings10110197
Chicago/Turabian StyleZinco, Adamo; Fraternali, Fernando; Benzoni, Gianmario; Martinelli, Enzo. 2020. "On the Distribution in Height of Base Shear Forces in Linear Static Analysis of Base-Isolated Structures" Buildings 10, no. 11: 197. https://doi.org/10.3390/buildings10110197
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