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The geometry of the...
The geometry of the equilibrium of forces and moments in shells
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- Adiels, Emil, 1989 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Williams, Christopher John Kenneth, 1951 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2024
- 2024
- Engelska.
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Ingår i: Meccanica. - 1572-9648 .- 0025-6455. ; In Press
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We demonstrate that the internal forces and moments in a shell structure can be described by 4 vectors in 3 dimensional space which could be used to express the equilibrium of a shell graphically. The internal forces and moments described by 2 of the 4 vectors actively carry imposed loads and imposed couples, while the other 2 describe ‘redundant’ internal forces and moments that are purely in equilibrium with themselves. Nevertheless redundant stresses and moments are important in controlling internal stresses and satisfying boundary conditions. We show that forces and moments ‘flow’ across a shell in exactly the same way that fluid flows, with a combination of irrotational flow and incompressible flow. The aim is that these ideas can help in the initial design of those shell structures which have to rely on bending moments in addition to membrane action in supporting loads, and also in the interpretation of results from an analysis using the finite element method. We demonstrate the use of the technique for the design of an umbrella structure like those built by Amancio Williams.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Samhällsbyggnadsteknik -- Arkitekturteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Civil Engineering -- Architectural Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Teknisk mekanik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Applied Mechanics (hsv//eng)
- HUMANIORA -- Konst -- Arkitektur (hsv//swe)
- HUMANITIES -- Arts -- Architecture (hsv//eng)
Nyckelord
- Membrane theory
- Shells
- Airy stress function
- Beltrami stress functions
- Redundant forces and moments
- Pucher’s equation
- Günther stress functions
- Formfinding
- Graphic statics
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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