Seismic risk assessment for mainland Portugal

Silva, Vítor; Crowley, Helen; Varum, Humberto; Pinho, Rui

doi:10.1007/s10518-014-9630-0

Cited by 141 publications

(116 citation statements)

References 53 publications

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“…In order to do so, different techniques have been applied and are documented in the literature. For example, the disaggregation of the building stock at parish level performed by Silva et al (2014) in the earthquake risk assessment for mainland Portugal is based on the population distribution on a 30 arcsec grid according to LandScan, which in turn is based on road proximity, slope, land cover and night-time lights (Dobson et al, 2000). Another instance is the disaggregation of municipal data carried out by Thieken et al (2008) in the development of a flood loss estimation model for the private sector, based on CORINE land cover data with the help of a dasymetric mapping approach (Gallego and Peedell, 2001).…”

Section: R Figueiredo and M Martina: Open Building Data In The Devementioning

confidence: 99%

Using open building data in the development of exposure data sets for catastrophe risk modelling

Figueiredo

Martina

2016

Nat. Hazards Earth Syst. Sci.

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Abstract.One of the necessary components to perform catastrophe risk modelling is information on the buildings at risk, such as their spatial location, geometry, height, occupancy type and other characteristics. This is commonly referred to as the exposure model or data set. When modelling large areas, developing exposure data sets with the relevant information about every individual building is not practicable. Thus, census data at coarse spatial resolutions are often used as the starting point for the creation of such data sets, after which disaggregation to finer resolutions is carried out using different methods, based on proxies such as the population distribution. While these methods can produce acceptable results, they cannot be considered ideal. Nowadays, the availability of open data is increasing and it is possible to obtain information about buildings for some regions. Although this type of information is usually limited and, therefore, insufficient to generate an exposure data set, it can still be very useful in its elaboration. In this paper, we focus on how open building data can be used to develop a gridded exposure model by disaggregating existing census data at coarser resolutions. Furthermore, we analyse how the selection of the level of spatial resolution can impact the accuracy and precision of the model, and compare the results in terms of affected residential building areas, due to a flood event, between different models.

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Section: R Figueiredo and M Martina: Open Building Data In The Devementioning

confidence: 99%

Using open building data in the development of exposure data sets for catastrophe risk modelling

Figueiredo

Martina

2016

Nat. Hazards Earth Syst. Sci.

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“…These results were applied in a probabilistic seismic risk assessment for mainland Portugal, as described in Silva et al (2014a).…”

mentioning

confidence: 99%

Investigation of the characteristics of Portuguese regular moment-frame RC buildings and development of a vulnerability model

Silva

Crowley

Varum

et al. 2014

Bull Earthquake Eng

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A vulnerability model capable of providing the probabilistic distribution of loss ratio for a set of intensity measure levels is a fundamental tool to perform earthquake loss estimation and seismic risk assessment. The aim of the study presented herein is to develop a set of vulnerability functions for 48 reinforced concrete building typologies, categorized based on the date of construction (which has a direct relation with the design code level), number of storeys (height of the building) and seismic zonation (which affects the design of the buildings). An analytical methodology was adopted, in which thousands of nonlinear dynamic analyses were performed on 2D moment resisting frames with masonry infills, using one hundred ground motion records that are compatible, to the extent possible, with the Portuguese tectonic environment. The generation of the structural models was carried out using the probabilistic distribution of a set of geometric and material properties, compiled based on information gathered from a large sample of drawings and technical specifications of typical Portuguese reinforced concrete buildings, located in various regions in the country. Various key aspects in the development of the vulnerability model are investigated herein, such as the selection of the ground motion records, the modelling of the infilled frames, the definition of the damage criterion and the evaluation of dynamic (i.e. period of vibration) and structural (i.e. displacement and base shear capacity) parameters of the frames. A statistical bootstrap 123Bull Earthquake Eng method is demonstrated to estimate the variability of the loss ratio at each intensity measure level, allowing the estimation of the mean, as well as 10 and 90 % percentile vulnerability curves.

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“…Lagos), was considered in this study, both for design and seismic performance assessment purposes. Probabilistic Seismic Hazard Analysis (PSHA) was performed for the site in question, using the open source software OpenQuake (Pagani et al [13] and the seismic hazard model developed in SHARE (Woessner et al [14]), whilst also including additional hazard sources (Vilanova and Fonseca [15]) and employing the ground motion prediction equations from Atkinson and Boore [16] and Akkar and Bommer [17], with a weight of 70% and 30%, respectively (Silva et al [18]). Disaggregation of the seismic hazard (Bazurro and Cornell [19]) on magnitude, distance and  was performed.…”

Section: Site Hazard and Ground Motion Record Selectionmentioning

confidence: 99%

Seismic performance assessment of conventional steel and steel-concrete composite moment frames using CFST columns

Silva

Jiang

Macedo

et al. 2018

Proceedings 12th International Conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018

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The research reported in this paper focuses on the assessment of the seismic performance of conventional steel moment-resisting frames (MRFs) and steel-concrete composite moment-resisting frames employing circular Concrete-Filled Steel Tube (CFST) columns. Two comparable archetypes (i.e. one steel MRF, with steel columns and steel beams; and one composite MRF, with circular CFST columns and steel beams) are designed, and used as the basis for comparison between the seismic performance associated with each typology. Both structures are designed against earthquake loads following the recommendations of Eurocode 8. The comparison of the obtained design solutions allows concluding that the amount of steel associated with the main structural members is higher for the steel-only archetype, even though the composite MRF has the higher level of lateral stiffness. This aspect is particularly relevant when one considers that a minimum level of lateral stiffness (associated with the P-Δ inter-storey drift sensitivity coefficient, θ), is imposed by the European code, which may ultimately govern the design process. The two case-studies are then numerically modelled in OpenSees, and their seismic performance is assessed through fragility assessment for a number of relevant limit states, and, finally, earthquake-induced loss estimation. In general, the results obtained clearly indicate that the composite MRF with circular CFST columns exhibits better seismic performance than the equivalent steel-only archetype. This is noticeably shown in the comparison of the fragility curves associated with the collapse limit state, which tend to show substantially higher probabilities of exceedance, at similar levels of 1 st -mode spectral acceleration, for the steelonly case. Furthermore, seismic losses at several seismic intensity levels of interest tend to be higher for the steel MRF.

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Seismic risk assessment for mainland Portugal

Cited by 141 publications

References 53 publications

Using open building data in the development of exposure data sets for catastrophe risk modelling

Using open building data in the development of exposure data sets for catastrophe risk modelling

Investigation of the characteristics of Portuguese regular moment-frame RC buildings and development of a vulnerability model

Seismic performance assessment of conventional steel and steel-concrete composite moment frames using CFST columns

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