aulas concreto 1
DESCRIPTION
Aula sobre Supra estrutura de concreto, ministrada pelo Professor Renato AcrizTRANSCRIPT
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CONCRETO IProf° Renato Acriz MenezesMestre em estruturas de edificações (UFU‐MG)
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Cuidado com o recebimento do concreto fator a/c
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NBR 6118:2014 – Projeto de estruturas de concreto armado ‐Procedimento
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CQP VERIFICA O ESTADO LIMITE DE DEFORMAÇÕES EXCESSIVAS (ELS‐DEF)
CF VERIFICA O ESTADO LIMITE DE FORMAÇÃO DE FISSURAS (ELS‐F), ABERTURA DE FISSURAS (ELS‐W) E VIBRAÇÕES EXCESSIVAS (ELS‐VIB)
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‐ Esta seção transversal não pode mais contar com a colaboração do concreto na resistência àtração;‐O Estádio II tem dois momentos distintos, o primeiro onde se formam as fissuras a medidaque a carga aumenta e o segundo onde as fissuras se estabilizam (não aparecem mais novasfissuras) e suas aberturas e extensões aumentam;‐ Em ambos o concreto e o aço dividem as resistências à compressão e traçãorespectivamente;
ESTÁDIO III
‐ são atingidos os limites de tensão e escoamento admitidos para um ou para os doismateriais;‐ Assim chamado de limite de ruptura;‐ Embora não corresponda exatamente a ruína dos materiais ou colapso do elementoestrutural sendo um limite convencional de ruptura.
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Estádio I e II – Correspondem as ações de serviço (quando atuam as situações reais);
Estádio III – Corresponde ao estado limite último (ações majoradas e resistências minoradas) Que só ocorrem em situações extremas.
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