Murià-Vila, David

Influence of Soil-Structure Interaction and Subsoil Consolidation in the Seismic Response of a Building

Abstract eng:
Nowadays, there are a few dozen of seismically-instrumented buildings in Mexico, from which one of the best instrumented was selected for this paper (PC building). The building is a 17-storey reinforced concrete structure located in Mexico City. It is founded on soft soil through an embedded box supported on friction piles. The building is one of the several structures that were damaged during the Michoacán earthquake (September 19th of 1985, Mw =8.1) and it was later retrofitted. Since 1990 an accelerometer network is operating in the building. Twenty-five seismic events have been recorded and analyzed through these 26 years of continuous monitoring. The maximum responses recorded in the building until 2015 in terms of maximum acceleration and displacement have been 0.22 g and 24 cm respectively. The maximum drift, calculated by dividing the relative displacements by the vertical distance between instrumented stories, has been 0.55%. The purpose of this paper is to present the variations of the vibration frequencies of the soil-structure system and the vibration frequencies of the structure excluding the effects of soil-structure interaction (SSI). In addition, the influence of the building damage and of the increase of the site dominant frequency in defining the vibration frequency of the whole soil-structure system is discussed. The analyses of the aforementioned records are studied with a simplified model and by using a system identification technique based on the Modal Minimization Method (MM model). Both models are used to identify the vibration frequencies of fixed-base buildings and to evaluate if the frequency variations of the systems correlate with SSI effects. It was found that the MM model is a useful tool for identifying the frequencies of the fixed base building, the movement of the base, and of the whole system.

Contributors:

Aldama, Baruo

Conference Title:

Proceedings of the 16th World Conference on Earthquake Engineering

Conference Title:

16th World Conference on Earthquake Engineering

Conference Venue:

Santiago (CL)

Conference Dates:

2017-01-09 / 2017-01-13

Rights:

Text je chráněný podle autorského zákona č. 121/2000 Sb.