Thin Shell Concrete Style and Structure Essay

Jessica Mandrick E90 Project Proposal Swarthmore College Division of Architectural

Thin Cover Concrete Structure Design and Construction




The ACI code describes a thin cover as a: " Three-dimensional space structure produced

up of more than one curved slabs or folded plates in whose thicknesses happen to be small when compared to their different dimensions. Slender shells happen to be characterized by all their three-dimensional loadcarrying behavior, which is determined by the geometry with their forms, by the manner in which they can be supported, through the nature of the applied weight. ” Concrete shell buildings are able to period large miles with a minimal amount of fabric. An mid-foot, spanning many feet, could be mere in . thick. In maintaining this economy of material, these forms have a light, aesthetic, sculptural appeal. We am planning on designing and constructing a thin shell tangible structure to get my mature design job. The framework constructed would be at a maximum size, ten feet by ten feet, which may be scaled straight down if necessary during the design stage. I will be working on this task with Rebecca Burrow who will be assisting as part of a aimed reading established through Teacher Siddiqui. Rebecca is currently in another country. Thin cover concrete structures are natural compression set ups formed via inverse catenary shapes. Catenary shapes will be those taken by string or perhaps fabric when ever allowed to suspend freely beneath their own excess weight. As chain can carry no compression, the free hanging type is in real tension. The inverse of this form can be described as pure compression structure. Real compression is great for concrete since concrete provides high compressive strength and extremely low tensile strength (ts). These styles maximize the effectiveness of concrete, letting it form slim light spans.


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Structural Design and Analysis of Thin Cover Structures A structural style of the thin-shelled concrete structure will be computed using

catenary and geometrical shape equations. The design will be anticlastic meaning that its primary curvatures manage in opposing directions, like the hyperbolic saddle. It may be produced out of a combination of two intersecting hyperbolic paraboloids, creating a hyperbolic groined vault (Figure 1) or a related complex condition. The hyperbolic paraboloid (Figure 2

2) could be shaped as a curved surface or from direct boards, and it is the only warped surface whose stresses could be calculated applying elementary math (Faber 1963). The examination becomes more complex when multiple shapes are combined plus the resulting equations will need to be produced or computed via statistical analysis. The resulting shape will be patterned by ANSYS software. Many different forms and dimensions will probably be modeled right up until both looks and power of shape are strengthened. AutoCAD software program will be used to make engineering sketches of the last design.

Physique 1: La Concha Lodge Lobby Vegas (Save La Concha)

Physique 2: Picture of a Hyperbolic Paraboloid (Billington 1982)


y2 x2 в€’ z= h2 h1 w they would ere a2 h1 sama dengan c1 b2 h2 sama dengan c2

Equation One Area of a Hyperbolic Paraboloid

The shell will be subject to examination of pressure and deviation using ANSYS finite element software. This software will certainly reveal essential areas and may even lead to changes in the design and style if the durability of the cement shell is definitely surpassed at any point. The composition will most likely become modeled employing plates. An adequate number of plates will be selected such that the curvature with the shell is usually approximated. In " An Introduction to Covering Structures”, Michele Melaragno presents a part on computer analysis of shells and domes. For the 360 degree circular domes structure your woman breaks the shell into 36 gigantic lines every single with eleven circumferential divisions. These sections may be used to approx . the number of dishes needed to unit the hyperbolic paraboloid. Melaragno also shows that thin layer structures could be modeled employing tension and compression associates in a...

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