Zusammenhänge zwischen makroseismischen Intensitäten und Antwortspektren, Erdbebendauer und Bauwerksvulnerabilität

Schmitt, Timo; Meskouris, Konstantin (Thesis advisor)

Aachen : Mainz (2012)
Dissertation / PhD Thesis

In: Mitteilungen des Lehrstuhls für Baustatik und Baudynamik, Fakultät für Bauingenieur- und Vermessungswesen, Rheinisch-Westfälische Technische Hochschule Aachen 21 = 12/1
Page(s)/Article-Nr.: 187 S. : graph. Darst.

Abstract

In structural engineering seismic loads usually are calculated based on response spectra. In the cases where the evaluation of non-normative site-specific response spectra is required, usually empirical evaluations of real earthquake registrations are used. Earthquake energy is described by magnitude and seismic impact by macroseismic intensity. In literature, there are numerous equations to calculate response spectra based on magnitude, distance and soil conditions, but there are almost no studies about intensity-based response spectra. Despite of the increasing number of metrological determined magnitudes, intensity is still an important parameter. Many seismic hazard maps refer to intensities and even some codes and regulatory guides use intensity values. The presented work shows the coherence between macroseismic intensity and other parameters that influence intensity. The way to do it has consisted of collecting and evaluating enough strong motion registrations to provide intensity and soil dependent response spectra. The evaluation considered the influence of ground type, deeper subsoil, magnitude, distance and type of structure. California was chosen as test area. In total, 411 horizontal components from nine earthquakes were evaluated, after assembling information about magnitude, distance and local soil conditions. Using detailed macroseismic information about the seismic impact, a local intensity was assigned to every registration according to the closest observed intensities in the site vicinity. From all the records the response spectra were calculated. Then, for specific groups of response spectra, according to intensity, soil class and other parameters, median spectral values were calculated as well as standard deviation. In addition to the empirical evaluation of the response spectra, some examples of soil dynamic calculations were performed. The coherence between the evaluated response spectra and structural vulnerability as well as the applicability to European earthquake prone areas was discussed. The strong motion duration was calculated from all records according to different definitions to probe the suitability of these definitions in the context of macroseismic intensities. Finally, a correlation analysis with different seismic parameters was carried out.

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