Intensity measures for probabilistic assessment of non‐structural components acceleration demand

Biasio, Marco De; Grange, Stéphane; Dufour, Frédéric; Allain, Frederic; Petre-Lazar, Ilie

doi:10.1002/eqe.2582

Cited by 26 publications

(24 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One must nevertheless mention recent trends in building-specific vulnerability estimations that take into account the spectral content of the input motion around the building fundamental frequency (De Biasio et al 2015;Perrault and Guéguen 2015). The present work goes one step further along the same direction in considering also nonlinearities in the site response, but with a different approach as (a) it focuses on the damage differences between identical buildings located on a given site and on the reference rock, instead of considering only the "absolute" damage level, and (b) it considers multiple explanatory variables, mixing the rock loading level, site conditions and building characteristics through the peak ground acceleration on standard rock, a site amplification proxy and the ratio of elastic frequencies of building and soil, f struct /f soil .…”

Section: Discussionmentioning

confidence: 99%

“…Concerning the former, the characteristics of seismic loading are generally derived from the code, i.e., based on very crude site classification, without specific attention to site frequency and associated amplification. Recent findings by De Biasio et al (2015) or Perrault and Guéguen (2015) have already concluded that the ground motion intensity offering the best correlation with damage in…”

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Using ambient vibration measurements for risk assessment at an urban scale: from numerical proof of concept to Beirut case study (Lebanon)

Salameh

Bard

Guillier

et al. 2017

Earth Planets Space

View full text Add to dashboard Cite

Post-seismic investigations repeatedly indicate that structures having frequencies close to foundation soil frequencies exhibit significantly heavier damages (Caracas 1967; Mexico 1985; Pujili, Ecuador 1996; L' Aquila 2009). However, observations of modal frequencies of soils and buildings in a region or within a current seismic risk analysis are not fully considered together, even when past earthquakes have demonstrated that coinciding soil and building frequencies leads to greater damage. The present paper thus focuses on a comprehensive numerical analysis to investigate the effect of coincidence between site and building frequencies. A total of 887 realistic soil profiles are coupled with a set of 141 single-degree-of-freedom elastoplastic oscillators, and their combined (nonlinear) response is computed for both linear and nonlinear soil behaviors, for a large number (60) of synthetic input signals with various PGA levels and frequency contents. The associated damage is quantified on the basis of the maximum displacement as compared to both yield and ultimate post-elastic displacements, according to the RISK-UE project recommendations (Lagomarsino and Giovinazzi in Bull Earthq Eng 4(4): 2006), and compared with the damage obtained in the case of a similar building located on rock. The correlation between this soil/rock damage increment and a number of simplified mechanical and loading parameters is then analyzed using a neural network approach. The results emphasize the key role played by the building/soil frequency ratio even when both soil and building behave nonlinearly; other important parameters are the PGA level, the soil/rock velocity contrast and the building ductility. A numerical investigation based on simulation of ambient noise for the whole set of 887 profiles also indicates that the amplitude of H/V ratio may be considered as a satisfactory proxy for site amplification when applied to measurements at urban scale. A very easy implementation of this method, using ambient vibration measurements both at ground level and within buildings, is illustrated with an example application for the city of Beirut (Lebanon).

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Using ambient vibration measurements for risk assessment at an urban scale: from numerical proof of concept to Beirut case study (Lebanon)

Salameh

Bard

Guillier

et al. 2017

Earth Planets Space

View full text Add to dashboard Cite

show abstract

“…The appropriate design safety factors for each expansion joint and adjacent building FIGURE 3 Analytical models of the adjacent buildings at which expansion joints were assumed at a height of 44 m model are determined based on the response database. 40 However, in the case of expansion joints where damage depends on the peak relative displacement between two buildings, IM should be sensitive to the peak relative displacement. 39 For IDA, the appropriate IM is essential to reduce the computational cost and variance of response.…”

Section: Intensity Measurementioning

confidence: 99%

“…Commonly used IMs are the peak ground acceleration (PGA), peak ground velocity (PGV), and spectral acceleration at the fundamental period. 40 However, in the case of expansion joints where damage depends on the peak relative displacement between two buildings, IM should be sensitive to the peak relative displacement. Tubaldi et al 28 studied the selection of an appropriate IM for the seismic pounding problem between two buildings and proposed the following intensity measure, noted by IM rel :…”

Section: Intensity Measurementioning

confidence: 99%

Fragility function development and seismic loss assessment of expansion joints

Otsuki

Kurata

Skalomenos

et al. 2019

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

Summary Expansion joints are used as a special connection equipment between adjacent buildings to accommodate the relative motions generated by wind, thermal, or earthquake loads, but they often exhibit damage during severe earthquakes. The level of damage and safety factors required to avoid loss of function are not well considered in current design practices. The objective of this paper is to provide quantitative information on the seismic damage probability of common expansion joints and the associated repair costs. The designer and engineer can refer to this information as a basis for decision making in the selection of expansion joints. Four common types of expansion joints are considered: high‐ and standard‐performance floor and wall expansion joints, whose damage states have been evaluated recently by the authors through shaking table tests. First, the fragility functions of expansion joints for seven damage patterns are developed utilizing the test results. Next, the vulnerability of expansion joints installed between adjacent building models is assessed via incremental dynamic analysis. The recommended level of safety factor to ensure the function of expansion joints is discussed. Finally, a procedure for cost‐effective selection of expansion joints is introduced, where case studies are examined using buildings with different characteristics. The presented results are deemed to be beneficial for improving the design practice of expansion joints and for reducing future seismic loss.

show abstract

“…The question arises as to which IM is well correlated to the seismic demand on rigid blocks. From a performance-based earthquake engineering perspective, the identification of an efficient IM which is valid for a generic rigid block assumes a key role, as well as the assessment of fragility curves for loss assessment [24]. A fragility study of rigid blocks is therefore con-ducted aimed at two different objectives: (a) assessment of the most efficient IM; (b) influence of geometric properties of the rigid block on its performance.…”

Section: Fragility Analysismentioning

confidence: 99%