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Vulnerability and risk analyzes of structures subjected to earthquake-induced building pounding with a non-smooth contact dynamics method

Abstract : Earthquake-induced building pounding is a solicitation whose consequences are difficult to quantify, both experimentally and numerically, due to a large number of parameters involved and the multiple possible configurations (non-exhaustive, modal behavior of structures, location of impact, elastic or inelastic behavior, separation distance, etc.). An important part of the literature and engineering methods focuses on the parameterization of Kelvin-Voigt type contact-impact models. Although giving satisfactory results, these models use two to three parameters whose calibration is subject to discussion. Moreover, the concept of risk analysis based on structural performance has been developed in this framework of clash only in the 2000s. The objective of the present work is to link and contribute these two aspects, the treatment of contact and the associated risk analysis. To the best of the author's knowledge, the use of the NSCD (Non-Smooth Contact Dynamics) method is rare in the field of civil engineering, more specifically in inter-building clashing. This approach is numerically unconditionally stable (so large time steps can be chosen) and uses only one scalar parameter called restitution coefficient, representing the energy loss of the system during contact. An experimental/numerical comparison allows validating the use of the NSCD in the following framework: two adjacent structures, elastic, of the same height whose respective slabs can come into contact. Still in this framework, the NSCD is then used to study the efficiency and sufficiency of intensity indicators, parameters inherent to any seismic risk analysis. The indicator with the best predictive capabilities and independence is selected. It is then used in incremental (IDA) and spectral (CSS) hazard analyses to observe the effects of pounding, either beneficial or detrimental depending on the structural parameter observed, on linear and non-linear structures.
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Submitted on : Friday, January 28, 2022 - 9:58:14 AM
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  • HAL Id : tel-03546713, version 1

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Thomas Langlade. Vulnerability and risk analyzes of structures subjected to earthquake-induced building pounding with a non-smooth contact dynamics method. Civil Engineering. Université de Lyon, 2021. English. ⟨NNT : 2021LYSEI072⟩. ⟨tel-03546713⟩

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