CAPITULO 7-Barras Axialmente Comprimidas

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CAPITULO 7-Barras Axialmente Comprimidas

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Compressão axicial vigas metalicas

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FLAMBAGEM POR DISTORÇÃO DA

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ESTRUTURAS METÁLICAS

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7. BARRAS COMPRIMIDAS

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7.1. GENERALIDADES

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BARRAS COMPRIMIDAS são aquelas solicitadas exclusivamente por força axial de compressão

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Aparecem compondo treliças e pilares  Sign up to vote on this title como pi e também frequentemente,  Useful  Not useful quais as vigas (ou outros elementos por meio de rótulas, e como compon

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7.2. INSTABILIDADE DE BARRAS COM CURVAT INICIAL 7.2.1 Fundamentos Teóricos Sign up to vote on this title

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O comportamento das barras comprimidas com curvatura inicial dife  Useful  Not useful substancialmente do comportamento das barras de eixo reto. As últi permanecem com eixo indeformável até a força de compressão atin

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7.2. INSTABILIDADE DE BARRAS COM CURVAT INICIAL 7.2.1 Fundamentos Teóricos Seja uma barra birrotulada com curvatura inicial, submetida a força axial de compressão


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7.2. INSTABILIDADE DE BARRAS COM CURVAT INICIAL 7.2.2 Força axial resistente de cálculo


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onde:  Useful  Not useful Ag f y é a força de escoamento da seção é o fator de redução, menor ou igual a

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7.2. FLAMBAGEM POR FLEXÃO DE BARRAS RE

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7.2.3 Valor da Força Axial de Flambagem Elástica Sign up to vote on this title

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A força axial de flambagem elástica, N e, deuma barra com SEÇÃ Useful  Not useful DUPLAMENTE SIMÉTRICA(I ou H) em relação a um ponto, é da menor valor:

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7.2. FLAMBAGEM POR FLEXÃO DE BARRAS RE 7.2.3 Valor da Força Axial de Flambagem Elástica Sign up to vote on this title onde:  Useful  Notx;useful K x L x é comprimento de flambagem por flexão em relação ao eixo K y Ly é comprimento de flambagem por flexão em relação ao eixo y;

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A força axial de flambagem elástica, N e, deuma barra com SEÇÃ Useful  Not useful MONOSSIMÉTRICA , cujo eixo y é o de simétrica, é dada pelo m valor:

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7.2.3 Valor da Força Axial de Flambagem Elástica 

Sign up to vote condições on this title O coeficiente de flambagem por torção, K z , função das de co Useful  Not useful deve ser determinado por análise estrutural, ousimplificadamente, toma a) 1,0 quando ambas as extremidades da barra possuírem rotação em

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7.3. FLAMBAGEM LOCAL

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7.3.1 Idéias básicas 

to vote on this title normalm Os elementos que formam os perfis estruturais Sign de upseção aberta  Useful  Not useful planos e apoiados em uma ou duas bordas longitudinais: os elementos apoiados em apenas uma borda longitudinal são denom •

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7.3.1 Idéias básicas

 Sob ação de forças axial de compressão, pode ocorrer a title flambagem Sign up to vote on this  Not useful ou mais elementos, AA e AL, componentes  deUseful um perfil, em um tipo estado-limite último que recebe a denominação de flambagem loca

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7.3.1 Idéias básicas •

 Para que não ocorra a flambagem local, é necessário que os elemen Sign up to vote on this title useful . Nesses  Useful  Not AL possuam a relação (b/t ) menor que um valor limite (b/t) lim o valor do fator de redução total Q é igual a 1,0.

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7.3.1 Idéias básicas Sign up to vote on this title

Valores de b, t, e (b/t)lim Useful

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7. BARRAS COMPRIMIDAS 7.3. FLAMBAGEM LOCAL 7.3.1 Idéias básicas Sign up to vote on this title

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7. BARRAS COMPRIMIDAS 7.3. FLAMBAGEM LOCAL 7.3.2 Elementos AA Quando os valores ultrapassarem os limites o fator de redução deverá  Sign up to vote on this title definido como: Useful Not useful Qa = Aef / Ag

onde:

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7. BARRAS COMPRIMIDAS 7.3. FLAMBAGEM LOCAL 7.3.3 Elementos AL Os valores de Qs a serem considerados para os elementos comprimidos  Sign up to vote on this title os seguintes: Useful Not useful 

ELEMENTOS

(b/t)

(b/t)

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Q s

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6. BARRAS TRACIONADAS

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6.3. ESTADOS-LIMITES ÚLTIMOS

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Dimensionamento  Sign up to vote on this title A barra submetida à força axial de compressão, deve satisfazer a  Useful  Not useful relação:

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6.3. ESTADOS-LIMITES ÚLTIMOS

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Dimensionamento  Sign up to vote on this title A força axial de compressão resistente de cálculo éNot dada por: Useful useful 

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6.4. ESTADOS-LIMITES DE SERVIÇO

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LIMITAÇÃO DO ÍNDICE DE ESBELTEZ  Sign up to vote on é thisdado title O índice de esbeltez máximo (  ) das barras comprimidas, por:  Useful  Not useful  = ( KL/r)max  200 onde:

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7.6. BARRAS COMPOSTAS

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É usual se projetar barras compostas, constituídas principalmente p  cantoneiras em forma de T, duas cantoneiras detitlecruz ou d Signem up toforma vote on this Usefulmeio U. A união entre os perfis é comumente feita deuseful chapas esp  por  Not soldadas ou parafusadas aos mesmos

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CAPITULO 7-Barras Axialmente Comprimidas

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