6th Colloquium on historical earthquakes & paleoseismology studies

3D characterization of the geometry impact on the seismic response of complex reinforced concrete buildings using the transfer function method

24 Oct 2018, 13:45

35m

Han-sur-Lesse

Poster Preference Session 3 Posters Poster Session 1

Speaker

Mr arnaud montabert (Laboratoire de Géologie, Ecole Normale Supérieure de Paris)

Description

Archaeoseismology investigates the characteristics of past earthquakes on the basis of the observed and recorded damages on historical buildings or archaeological remains. To better achieve this scope, an important step might be the setup of the numerical modelling of past structures. Indeed, the seismic response of a building is intrinsically related to its geometry and mechanical properties, soil structure interaction and the waves propagation through the medium. Faced to the complexity of the detailed simulation of all these processes, we are implementing a simplified approach based on the analysis of structural typologies. One of the criteria introduced to discriminate buildings behaviour is their geometry. For this reason, as a first step before our archaeoseismological works, we hereafter focus on the impact of the geometry of building. To simplify the analysis we focus on reinforced-concrete buildings, whose mechanical behavior is well known. It is a common belief that the more a building presents simple shapes, the more it is resistant to earthquake shaking. However, irregularly shaped buildings are nowadays widely present in both Urban Civil Engineering and industrial facilities. With the aim to test the shape-dependent seismic response of the buildings, we designed 15 different buildings having different shapes and foundations. Thus, we performed a large amount of dynamic seismic analysis using more than 300 recorded accelerograms. The structure response is described in terms of Engineering Demand Parameters. We particularly focused on shear strength induced by the structure rotation, normalized by the normal strength. We show that seismic response is mainly controlled by the building mass, the used typology, and soil structure interaction rather than the floor geometry. Such conclusions will help us to model historical buildings and interpret the observed damages in order to quantify past motions.