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Selection of earthquake ground motions for multiple objectives using genetic algorithms.

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Bibliographic Details
Title: Selection of earthquake ground motions for multiple objectives using genetic algorithms.
Authors: Mergos, Panagiotis E.1 (AUTHOR) panagiotis.mergos.1@city.ac.uk, Sextos, Anastasios G.1 (AUTHOR)
Source: Engineering Structures. May2019, Vol. 187, p414-427. 14p.
Subjects: Genetic algorithms, Earthquake hazard analysis, Goal (Psychology), Earthquakes, Motion
Abstract: Highlights • A novel multi-objective framework for the selection of GM sets is proposed. • The framework does not consider only matching with a target response spectrum. • It ensures compliance with target values of additional selection objectives. • The new objectives are related to regional seismicity and strong GM intensity. • Furthermore, they can be related to strong GM duration and scaling factors. • The weighted sum method is used for first time to derive Pareto-optimal GM sets. • Parameters tuning is performed to optimize the performance of GA in GM selection. Abstract Existing earthquake ground motion (GM) selection methods for the seismic assessment of structural systems focus on spectral compatibility in terms of either only central values or both central values and variability. In this way, important selection criteria related to the seismology of the region, local soil conditions, strong GM intensity and duration as well as the magnitude of scale factors are considered only indirectly by setting them as constraints in the pre-processing phase in the form of permissible ranges. In this study, a novel framework for the optimum selection of earthquake GMs is presented, where the aforementioned criteria are treated explicitly as selection objectives. The framework is based on the principles of multi-objective optimization that is addressed with the aid of the Weighted Sum Method, which supports decision making both in the pre-processing and post-processing phase of the GM selection procedure. The solution of the derived equivalent single-objective optimization problem is performed by the application of a mixed-integer Genetic Algorithm and the effects of its parameters on the efficiency of the selection procedure are investigated. Application of the proposed framework shows that it is able to track GM sets that not only provide excellent spectral matching but they are also able to simultaneously consider more explicitly a set of additional criteria. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Highlights • A novel multi-objective framework for the selection of GM sets is proposed. • The framework does not consider only matching with a target response spectrum. • It ensures compliance with target values of additional selection objectives. • The new objectives are related to regional seismicity and strong GM intensity. • Furthermore, they can be related to strong GM duration and scaling factors. • The weighted sum method is used for first time to derive Pareto-optimal GM sets. • Parameters tuning is performed to optimize the performance of GA in GM selection. Abstract Existing earthquake ground motion (GM) selection methods for the seismic assessment of structural systems focus on spectral compatibility in terms of either only central values or both central values and variability. In this way, important selection criteria related to the seismology of the region, local soil conditions, strong GM intensity and duration as well as the magnitude of scale factors are considered only indirectly by setting them as constraints in the pre-processing phase in the form of permissible ranges. In this study, a novel framework for the optimum selection of earthquake GMs is presented, where the aforementioned criteria are treated explicitly as selection objectives. The framework is based on the principles of multi-objective optimization that is addressed with the aid of the Weighted Sum Method, which supports decision making both in the pre-processing and post-processing phase of the GM selection procedure. The solution of the derived equivalent single-objective optimization problem is performed by the application of a mixed-integer Genetic Algorithm and the effects of its parameters on the efficiency of the selection procedure are investigated. Application of the proposed framework shows that it is able to track GM sets that not only provide excellent spectral matching but they are also able to simultaneously consider more explicitly a set of additional criteria. [ABSTRACT FROM AUTHOR]
ISSN:01410296
DOI:10.1016/j.engstruct.2019.02.067