Abstract
The analysis of the ground foundation must take into consideration two main aspects: a simulation of the ground motion as close as possible to reality and the correlation of the ground motion with existing geological conditions. Thus, it can be distinguished two main functions of the soils: the function of a dynamic filter for the seismic movement that come from the source, and the function of a deformable spring for the buildings whose support is. In this paper, the behavior of a site was analyzed from the site response point of view, using different accelerograms of Romanian’s earthquake. These accelerograms were recorded during the 1977, 1986 and 1990 earthquakes. In order to perform equivalent linear site response analysis we use the STRATA software for a homogeneous soil layer with more than 10 meters depth. The soil type and the velocity layering were considered constant on the entire soil deposit. The analysis was done both on cohesive and cohesionless soils. The final results have been mapped in terms of soil dynamic characteristics, accelerograms and acceleration response spectrum, under different earthquake excitations. DOI: http://dx.doi.org/10.5755/j01.sace.9.4.7129
Highlights
Vrancea earthquake with MG-R = 7.2 magnitude (Pomonis, Coburn and Ledbetter 1990), being the first strong seismic motion recorded in Romania, August 31, 1986 with MG-R = 7.0 magnitude and May 30, 1990 (MG-R = 6.7), and May 31, 1990 (MG-R = 6.1) (Balan et al 1983, Sokolov, Boese and Wenyel 2008, Vlad and Vlad 2008)
2014/4/9 and victims were recorded. Due to this records obtained during this earthquakes it was possible to define the main characteristics of the Romania seismicity and to draw seismic maps with acceleration distribution for the entire territory
The present paper aims to develop a numerical simulation of horizontally layered soil deposits, to a depth up to 100 m, in order to evaluate soil effects under different earthquake excitations
Summary
In Romania, the design of structures for earthquake excitation is based on Eurocode 8 and Romanian designing code P100/2013 These norms give some general elements regarding the seismic effects on sites recorded during the time. For the response spectrum analysis of a site it is necessary to highlight the dynamic characteristics of the studied soil, namely stiffness and material damping. Estimation of the shear modulus and damping curves may be obtained from laboratory measurements a soil samples or derived from empirical models based on soil type and other variables (Kottke and Rathje 2009). Represented by the accelerograms of 1977, 1986 and 1990 In Romania, the design of structures for earthquake earthquake, recorded by the seismic station of INCERC ation is based on Eurocode 8 and Romanian designing. Characteristics values of the accelerograms recorded in 1977, 1986 and 1990 on N-S direction
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