Pombaline cage anti-seismic building design

E104070

The Pombaline cage anti-seismic building design is an 18th-century Portuguese structural system using an internal wooden lattice frame within masonry walls to improve buildings’ resistance to earthquakes.

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Predicate Object
instanceOf architectural innovation
building technology
seismic-resistant structural system
appliedInCity Lisbon
appliedInDistrict Baixa Pombalina of Lisbon
surface form: Baixa Pombalina
architecturalContext Pombaline architecture
associatedWithRegulation Pombaline building codes
component diagonal timber braces
masonry infill walls
timber floor diaphragms
timber posts and beams
constructionMethod integration of timber cage with masonry façades
prefabricated structural modules assembled on site
countryOfOrigin Portugal
designPrinciple distribution of seismic forces through lattice
flexible timber frame within rigid masonry shell
regular and repetitive structural bays
developedAfterEvent 1755 Lisbon earthquake
developedInCentury 18th century
eraOfUse 19th century Lisbon reconstruction
late 18th century
geographicFocus Portuguese seismic regions
hasAlternativeName Pombaline cage
gaiola pombalina
heritageStatusContext considered an early example of engineered seismic design in Europe
historicalPeriod Baixa Pombalina of Lisbon
surface form: Pombaline reconstruction of Lisbon
influenced later earthquake-resistant design concepts
influencedBy traditional timber framing techniques
locationOfExamples Baixa Pombalina of Lisbon
surface form: Baixa district of Lisbon

Chiado area of Lisbon
namedAfter Marquis of Pombal
surface form: Sebastião José de Carvalho e Melo, Marquis of Pombal
purpose dissipate seismic energy
improve resistance to earthquakes
reduce collapse risk during earthquakes
recognizedAs one of the earliest systematic anti-seismic building systems
safetyObjective limit structural damage in seismic events
protect inhabitants during earthquakes
structuralBehavior improves load redistribution under lateral loads
increases ductility of masonry buildings
structuralFeature internal wooden lattice frame
three-dimensional timber cage
timber braced frame embedded in masonry walls
testedBy full-scale shaking tests with marching troops
typicalUse mixed-use commercial and residential buildings
urban residential buildings
usesMaterial masonry
wood

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Full triples — surface form annotated when it differs from this entity's canonical label.

1755 Lisbon earthquake reconstructionFeature Pombaline cage anti-seismic building design
Baixa Pombalina of Lisbon hasBuildingType Pombaline cage anti-seismic building design
this entity surface form: Pombaline cage buildings