cursuri seism 2010-2011
TRANSCRIPT
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Zonarea Intensitatii Seismice
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Magnitudinea – masura a energiei eliberate de seism – bazata pe masuratori instrumentale
1935 – RICHTER 1ºR → crestere a energiei de 30 ori
Magnitudine locala Ml =
Unde,
A - Amplitudinea in micron masurata cu seismograf Wood Anderson T=0.6 s
Magnitudinea undelor de suprafata Ms
Magnitudinea undelor de volum mb se determina cu ajutorul amplitudinii undelor P
Magnitudinea de moment Mw
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Seimicitatea Romaniei
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R l ti F t D l
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Relatia Forta - Deplasare
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Forta de Amortizare
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Ecuatia de miscare in cazul unei forte externe
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Ecuatia de miscare in cazul unei forte externe
Ecuatia de miscare in cazul unei actiunii seismice
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Ecuatia de miscare in cazul unei actiunii seismice
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• Formularea problemei si determinarea eforturilor
• Combinarea raspunsului static cu cel dinamic
• Metode de rezolvare a ecuatiei de miscare
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Vibratii Libere - Vibratii libere neamortizate
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Vibratii libere amortizate
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Vibratii libere amortizate
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Atenuarea oscilatiilor
Vib tii F t t
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Vibratii Fortate
Vibratii armonice neamortizate
Vib tii F t t
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Vibratii Fortate
Vibratii armonice amortizate
Factori dinamici
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Factori dinamici
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Raspunsul dinamic sub actiunea unei forte arbitrare
Raspunsul dinamic sub actiunea unei forte arbitrare
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Raspunsul dinamic sub actiunea unei forte arbitrare
Miscarea Seismica
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D t i l i i i
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Determinarea raspunsului seismic
Spectre de Raspuns Elastic
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p p
Spectru de raspuns elastic al deplasarii Spectru de raspuns elastic al pseudo - vitezei
Spectru combinat D V A
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Spectru combinat D-V-A
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Carecteristicile Spectrelor de Raspuns Elastic
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Carecteristicile Spectrelor de Raspuns Elastic
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Spectre de Proiectare
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Spectre de Proiectare
Raspunsul inelastic al sistemelor SGLD
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Efectul comportarii elasto -plastice
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Relatia intre ductilitate si factorul de reducere
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Factori ce influenteaza miscarea seismica
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Sieteme cu mai multe grade de libertate dinamica (MGLD)
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Ecuatia de miscare: actiunea seismica
Vibratii Libere ale sistemelor MGLD
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Proprietati ale modurilor de vibratie
Ortogonalitatea modurilor proprii de vibratie
Normalizarea modurilor proprii
Dezvoltarea modala a deplasarilor
Analiza Modala
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Model Structural
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Torsiunea Accidentala
Clase de importanta si expunere
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Clase de importanta si expunere
Combinarea actiunii seismice
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Combinarea actiunii seismice
Concepte de proiectare
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•Comportare disipative (ductila) a structurii
•Comportare slab disipativa (fragila) a structuriiDuctilitatea este capacitatea structurii de a se deforma in domeniul plastic
fara o reducere substantiala a capacitatii portante
Concepte de proiectare disipativa a structurii
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T>Tc; T<Tc
Verificarea la Starea Limita Ultima SLU
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Conditia de rezistenta
Limitarea deplasarilor laterale
Verificarea ductilitatii locale si globale
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Rezistenta fundatiilor
Rosturi seismice
Verificarea ductilitatii locale si globale
Dimensionarea fundatiilor si a prinderilor
elementelor structurale in fundatii trebuie
realizata pe baza eforturilor obtinute pe
principiul proiectarii bazate pe capacitate, in
ipoteza formarii unui mecanism plastic in
suprastructura
Verificarea la Starea Limita de Serviciu
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Proiectarea seismica a structurilor din beton armat
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Tipuri de structuri:
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Ductilitatea materialelor
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Ductilitatea de sectiune
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Ductilitatea de sectiune
Ductilitatea de element:
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Ductilitatea de element:
Grinzi:
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Stalpi:
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Pereti:
Noduri de cadru
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Ductilitatea structurii:
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Structuri in cadre
Structuri in diafragme
Proiectarea Structurilor Metalice
Principii de proiectare
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Principii de proiectare
Tipuri de structuri
Ductilitatea structurilor metalice
Ductilitatea de material
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Ductilitatea de sectiune
Ductilitatea de element
Imbinarile elementelor structurale
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Ductilitatea structurii
Cadre Necontravantuite
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Cadre metalice contravantuite centric
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Cadre metalice contravantuite excentric
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Proiectarea Structurilor din Lemn
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Proiectarea Structurilor din Lemn
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Proiectarea Structurilor din Zidarie
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Proiectarea Structurilor din Zidarie
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