análise numérica da ancoragem em ligações do tipo viga-pilar de ...
análise numérica da ancoragem em ligações do tipo viga-pilar de ...
análise numérica da ancoragem em ligações do tipo viga-pilar de ...
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Aspectos básicos <strong>da</strong> <strong>ancorag<strong>em</strong></strong><br />
seja coloca<strong>da</strong> além <strong>da</strong> zona <strong>de</strong> extr<strong>em</strong>i<strong>da</strong><strong>de</strong> <strong>da</strong> <strong>ancorag<strong>em</strong></strong>, numa distância até <strong>de</strong> 4φ<br />
<strong>de</strong>ssa extr<strong>em</strong>i<strong>da</strong><strong>de</strong> (FUSCO, 1995).<br />
To<strong>da</strong>via, Glanville (1930) 1 apud Allwood e Bajarwan (1996) d<strong>em</strong>onstrou que o<br />
melhor <strong>de</strong>s<strong>em</strong>penho <strong>da</strong>s barras comprimi<strong>da</strong>s se <strong>de</strong>ve, <strong>em</strong> parte, ao efeito Poisson<br />
causa<strong>do</strong> pelo aumento <strong>do</strong> diâmetro <strong>da</strong> barra que, por conseguinte, eleva a tensão radial,<br />
mobilizan<strong>do</strong> uma parcela relevante <strong>da</strong>s tensões <strong>de</strong> a<strong>de</strong>rência por atrito.<br />
Extr<strong>em</strong>i<strong>da</strong><strong>de</strong> <strong>da</strong> barra traciona<strong>da</strong><br />
Figura 2.6 – Fendilhamento cônico (barras traciona<strong>da</strong>s) – Modifica<strong>do</strong> <strong>de</strong> FUSCO<br />
(1995).<br />
F<br />
Extr<strong>em</strong>i<strong>da</strong><strong>de</strong> <strong>da</strong> barra comprimi<strong>da</strong><br />
Figura 2.7 – Fendilhamento lateral <strong>do</strong> concreto (barras comprimi<strong>da</strong>s) – Modifica<strong>do</strong> <strong>de</strong><br />
FUSCO (1995).<br />
2.3.2 Ancorag<strong>em</strong> com gancho <strong>de</strong> extr<strong>em</strong>i<strong>da</strong><strong>de</strong><br />
Des<strong>de</strong> mea<strong>do</strong>s <strong>do</strong> século XX, t<strong>em</strong>-se discuti<strong>do</strong> a <strong>ancorag<strong>em</strong></strong> com o uso <strong>de</strong><br />
gancho haja vista a complexi<strong>da</strong><strong>de</strong> e diversi<strong>da</strong><strong>de</strong> <strong>de</strong> fatores intervenientes na sua<br />
1<br />
GLANVILLE, W. H. (1930). Studies in reinforced concrete-bond resistance. Building Research<br />
Technical Paper, n.10.<br />
-<br />
+<br />
σ tt<br />
F<br />
28