| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 4.98 MB | Adobe PDF |
Authors
Advisor(s)
Abstract(s)
Este trabalho reflecte sobre a capacidade resistente do betão, no que diz respeito à utilização do espaço provido pelo recobrimento das estruturas de betão armado, para proporcionar a transmissão de esforços nas pós-instalações de uma maneira mais eficiente e com um menor número de condicionantes.
Nas ligações onde existe um binário de esforços nas interfaces, podemos estabelecer que se for provida uma indentação adequada na zona de compressão, o betão tem a capacidade de transmitir esforços elevados com um ângulo relativamente baixo face à sua superfície.
Neste documento é analisada uma solução utilizando a formulação com base nos modelos de escoras e tirantes, de forma a retratar de forma simplificada e coerente como essa introdução de esforços se redistribui para o interior do corpo sólido de betão. No caso apresentado resolveu contabilizar-se o efeito favorável da compressão triaxial junto a cargas concentradas que levou a um modelo tridimensional.
Através da análise são apresentados os procedimentos para caracterizar a zona nodal nas imediações da ligação. Com base na simplificação dos campos de tensão, foram adaptadas as formulações com vista a encontrar o valor máximo de resistência dessa ligação.
This work reflects on concrete capacity design of a connection that uses concrete cover to establish a way to transmit forces in post-installations with efficiency and less construction site problems. In connections where there is a set of forces between interfaces, if a keyed joint where created on the correspondent compression area, concrete is able to transmit that force even in a lower angle of application regarding to concrete’s surface. In this paper an analysis has been conducted to a specific case with a strut and tie formulation, in a way to comprehend with a simple yet clarifying perspective the flow of forces, from where they’re applied into the interior of the solid body. In this case, the favorable effect of confining stresses in the periphery of a concentrated load has been taken into account, which has lead into a tri-dimensional model. Through the analysis, procedures had been carried out in order to characterize the nodal zone in the vicinity of the connection. With simplified stress fields the recommendations and formulations had been adapted to each case in order to establish a maximum value that connection could support.
This work reflects on concrete capacity design of a connection that uses concrete cover to establish a way to transmit forces in post-installations with efficiency and less construction site problems. In connections where there is a set of forces between interfaces, if a keyed joint where created on the correspondent compression area, concrete is able to transmit that force even in a lower angle of application regarding to concrete’s surface. In this paper an analysis has been conducted to a specific case with a strut and tie formulation, in a way to comprehend with a simple yet clarifying perspective the flow of forces, from where they’re applied into the interior of the solid body. In this case, the favorable effect of confining stresses in the periphery of a concentrated load has been taken into account, which has lead into a tri-dimensional model. Through the analysis, procedures had been carried out in order to characterize the nodal zone in the vicinity of the connection. With simplified stress fields the recommendations and formulations had been adapted to each case in order to establish a maximum value that connection could support.
Description
Keywords
Estruturas metálicas Estruturas de betão Ancoragens em betão armado Escoras - Modelos Tirantes - Modelos Estados triaxiais de tensão