A Next Generation Scalar Intensity Measure for Analytical Vulnerability Studies

Kazantzi, Athanasia K.; Vamvatsikos, Dimitrios

doi:10.7712/120115.3475.670

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…It is reasonable to assume that at the fundamental period the function uðTÞ is 1, uðT ¼ T 1 Þ ¼ 1, and then decreases on both sides up to 0 when the lower and upper bound Bull Earthquake Eng (2017) Recently, Kazantzi and Vamvatsikos (2015b) proposed for seismic vulnerability studies a new scalar IM that combines the geometric mean concept of spectral accelerations with a significant duration property of the ground motions based on the Arias Intensity.…”

Section: Definitionsmentioning

confidence: 99%

Optimal intensity measure based on spectral acceleration for P-delta vulnerable deteriorating frame structures in the collapse limit state

Adam

Kampenhuber

Ibarra

2017

Bull Earthquake Eng

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This study proposes an ''optimal'' spectral acceleration based intensity measure (IM) to assess the collapse capacity of generic moment frames vulnerable to the P-delta effect. The IM is derived from the geometric mean of the spectral pseudo-acceleration over a certain period interval. The optimized IM includes for first time a flexible lower limit for the period interval, corresponding to the structural period associated with the exceedance of 95% of the total effective mass. This flexible lower limit bound provides an efficient IM, independently of the contribution of higher modes to the total response. The upper bound period is 1.6 times the fundamental period to account for period elongation due to inelastic deformations and gravity loads. In a parametric study on generic frames, structural parameters are varied to quantify the performance of this IM compared to classical benchmark IMs. The ''optimal'' IM provides minimum, or close to the minimum, dispersion for the entire set of frames with different fundamental periods of vibration, number of stories, and P-delta vulnerability.

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Section: Definitionsmentioning

confidence: 99%

Optimal intensity measure based on spectral acceleration for P-delta vulnerable deteriorating frame structures in the collapse limit state

Adam

Kampenhuber

Ibarra

2017

Bull Earthquake Eng

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“…One aspect that is required in the site-specific seismic hazard assessment of a structure is the choice of an intensity measure (IM), that is, the measure used to characterise the intensity of ground shaking to be linked to different levels of damage when deriving fragility curves. Different types of IMs exist, with each one possessing their own inherent advantages and disadvantages [1][2][3][4][5]. One aspect that is typically desirable from any IM is for it to be efficient, meaning that is should be a relatively accurate predictor of the structural response and subsequently, the damage.…”

Section: Introductionmentioning

confidence: 99%

On the Efficient Risk Assessment of Bridge Structures

O’Reilly¹,

Monteiro²

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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In performance-based seismic assessment, structural response is characterised with increasing seismic intensity via some form of intensity measure (IM). IMs are typically related to the characteristics of ground shaking and dynamic properties of the structure, with spectral acceleration at the first and dominant mode of vibration being a popular choice in the case of buildings. In bridge structures, where no single dominant mode typically exists for bridges with any degree of irregularity, the use of spectral acceleration at one single mode of vibration may be somewhat inefficient due to a more multi-modal transverse structural response. To counter this and also to appease the needs of bridge portfolio assessment, where a group of structures is assessed collectively to evaluate entire bridge networks, peak ground acceleration has become a popular IM, albeit its drawbacks in terms of meaning with respect to structural dynamics. To address these limitations, this paper explores the use of different IMs for a more efficient assessment of bridges. Among these, there is average spectral acceleration, whereby a pertinent period range is used to define the IM that could suit the needs of a bridge structure with multi-modal response as well as when more than one bridge structure is considered. To do this, a number of bridges are considered and evaluated via incremental dynamic analysis for different IMs. The results show that average spectral acceleration is indeed a quite efficient IM that can lead to a more refined quantification of bridge performance, both individually and also as part of a larger bridge network when conducting portfolio risk assessment.

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A Next Generation Scalar Intensity Measure for Analytical Vulnerability Studies

Abstract: Abstract. To assess the seismic performance of a structural system within an analytical context, we need, among others, to specify a ground motion Intensity Measure (IM).

Cited by 2 publications

References 19 publications

Optimal intensity measure based on spectral acceleration for P-delta vulnerable deteriorating frame structures in the collapse limit state

Optimal intensity measure based on spectral acceleration for P-delta vulnerable deteriorating frame structures in the collapse limit state

On the Efficient Risk Assessment of Bridge Structures

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