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Structural failure analysis with CMS-based ground motion selection using innovative cost function and weight factors

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Earthquake Engineering and Engineering Vibration 2024年第4期23卷 899-918页

作者： Samadian, Delbaz Muhit, Imrose B. dawood, nashwan School of Computing Engineering and Digital Technologies Teesside University Middlesbrough UK

The selection and scaling of ground motion records is considered a primary and essential task in performing structural analysis and design. Conventional methods involve using ground motion models and a conditional spectrum to select ground motion records based on the target spectrum. This research demonstrates the influence of adopting different weighted factors for various period ranges during matching selected ground motions with the target hazard spectrum. The event data from the Next Generation Attenuation West 2 (NGA-West 2) database is used as the basis for ground motion selection, and hazard de-aggregation is conducted to estimate the event parameters of interest, which are then used to construct the target intensity measure (IM). The target IMs are then used to select ground motion records with different weighted vector-valued objective functions. The weights are altered to account for the relative importance of IM in accordance with the structural analysis application of steel moment resisting frame (SMRF) buildings. Instead of an ordinary objective function for the matching spectrum, a novel model is introduced and compared with the conventional cost function. The results indicate that when applying the new cost function for ground motion selection, it places higher demands on structures compared to the conventional cost function. Moreover, submitting more weights to the first-mode period of structures increases engineering demand parameters. Findings demonstrate that weight factors allocated to different period ranges can successfully account for period elongation and higher mode effects.

关键词： weighted objective function ground motion selection steel moment resisting frame hazard analysis

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Structural failure analysis with CMS-based ground motion selection using innovative cost function and weight factors

引用

Earthquake Engineering and Engineering Vibration 2024年第04期 899-918页

作者： Delbaz Samadian Imrose B.Muhit nashwan dawood School of Computing Engineering and Digital Technologies Teesside University

The selection and scaling of ground motion records is considered a primary and essential task in performing structural analysis and design. Conventional methods involve using ground motion models and a conditional spectrum to select ground motion records based on the target spectrum. This research demonstrates the influence of adopting different weighted factors for various period ranges during matching selected ground motions with the target hazard spectrum. The event data from the Next Generation Attenuation West 2(NGA-West 2) database is used as the basis for ground motion selection, and hazard de-aggregation is conducted to estimate the event parameters of interest, which are then used to construct the target intensity measure(IM). The target IMs are then used to select ground motion records with different weighted vector-valued objective functions. The weights are altered to account for the relative importance of IM in accordance with the structural analysis application of steel moment resisting frame(SMRF) buildings. Instead of an ordinary objective function for the matching spectrum, a novel model is introduced and compared with the conventional cost function. The results indicate that when applying the new cost function for ground motion selection, it places higher demands on structures compared to the conventional cost function. Moreover, submitting more weights to the first-mode period of structures increases engineering demand parameters. Findings demonstrate that weight factors allocated to different period ranges can successfully account for period elongation and higher mode effects.

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