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- Seismic vulnerability: From building evaluation to a typology generalizationPublication . Lamego, Paula; Lourenço, P. B.; Sousa, M. L.Outlining the best strategies for seismic risk mitigation requires that both benefits and costs of retrofitting are known in advance. The assessment of the vulnerability of building typologies is a first step of a more extensive effort, concerning the analysis of the viability of seismic risk mitigation and taking into account retrofitting costs. The methodology adopted to obtain the seismic vulnerability of some classes of residential buildings existing in mainland Portugal is presented. This methodology is based on a structural analysis of individual buildings belonging to the same typology. An application example is presented to illustrate the methodology. Fragility curves of “boxed” building typology are also presented and broken down into three height classes: low rise, medium-rise and high-rise. These curves are based on average capacity spectra derived from several individual buildings belonging to the same typology.
- Management options for construction and demolition wastes from residential recuperationPublication . Santos, Maria Teresa; Lamego, Paula; Frade, P.Nowadays, the construction, remodelling and demolition operations can cause serious environment impacts. These activities produce materials defined as construction and demolition wastes (CDW). The CDW generated in Europe represents around 25-30 % of total waste. In EU 28 CDW production is about 821,160,000 t, but there is a significant difference among the European countries, mainly because of the variation of construction and demolition activity. In 2011, the total production of CDW in Portugal was around 930,000 t, but regional production is not homogeneous. The substantial inert fraction from the CDW makes them suitable for reuse. The present study aims to quantify and characterize CDW from residential recuperation of small constructions in Portugal and then propose mitigating measures to improve CDW management. The results obtained by bibliographic research revealed that the construction and demolition activity has decreased significantly in the last years and consequently CDW production. In addition, it was observed a big number of entities were involved in CDW management. Therefore, it was necessary to select a specific area from Portugal (Setubal region) which has thirteen City Halls. The surveys had scarce response. This can be explained by the lack of obligation of enterprises with less than ten employees to register CDW production and because in some regions the CDW are mixed with municipal solid waste. Most of the CDW collected from Setubal region was disposed in landfill. In order to reduce CDW production it is necessary to promote and make available recycled materials for small works at low cost.
- Efficiency and cost-benefit analysis of seismic strengthening techniques for old residential buildings in LisbonPublication . Pedreira Marques, Rui Filipe; Lamego, Paula; Lourenco, Paulo; Sousa, Maria L.This paper presents a study on the techno-economic efficiency of seismic strengthening techniques for old residential buildings, with application to construction typologies in Lisbon (stone masonry and Placa buildings). A comprehensive review on strengthening techniques and implications for the seismic behavior is made. Different strengthening schemes are implicitly simulated within equivalent frame models of the representative buildings. Then, pushover analysis is applied in order to compare the seismic performance of the buildings, before and after strengthening. A cost-benefit analysis of the strengthening solutions is finally performed, comparing the economic benefit gained by reducing the seismic damage, against the intervention cost.
- Seismic vulnerability and risk analysis of the old building stock at urban scale: application to a neighbourhood in LisbonPublication . Lamego, Paula; Lourenco, Paulo B.; Sousa, Maria L.; Marques, RuiThe old buildings represent an important fraction of the urban fabric of the cities, which have implicit societal issues, like safety. This work deals with the seismic vulnerability assessment and risk analysis of the old building stock, with application to a neighbourhood in Lisbon. The studied neighbourhood includes three frequent building typologies in Portugal, i.e. stone masonry, "Placa" and RC buildings. Reference buildings for each typology were numerically modelled using the equivalent frame method. Pushover analysis was then performed to derive the vulnerability characteristics of the reference buildings and more general building classes, i.e. capacity and fragility curves, in order to assess the seismic vulnerability of the buildings and perform a seismic risk analysis. This last analysis was performed to estimate the building damages and the economic and life losses for different earthquake scenarios. Most of the studied buildings are found to be unsafe to the considered seismic actions and will suffer severe damages with associated large losses.