Untitled presentation.pptxefefefefefefefef
- 1. SHELL STRUCTURES HARIHARAN. R VIRENDRA VIKASH .C.M
- 2. SHELL STRUCTURE A Shell structure is also called Plate structure. These are Lightweight constructions using shell elements. The shell elements are typically curved and assembled into a large structure. It is made of reinforced concrete and serves both as a structure and covering. Shell structures are self-supporting and used to cover a large area of span without any supports of beams, columns, and walls.
- 3. They are capable of maintaining their shape and support loads without any help of frame or the solid mass materials. Due to its structural continuity, the shells can transmit the loads in different directions. Its a type of structure or structural element that can resist compressive, tensile, and shear forces because of the curvy shape. The thickness of these structures are very less as compared to its width and length.
- 4. NATURAL SHELLS The term “SHELL” is used to describe the structures which possess strength and rigidity due to its thin, natural and curved form such as shell of egg, a nut, human skull and shell of a tortoise.
- 6. SINGLE OR DOUBLE CURVATURE SHELLS ❖ Single curvature shell(monoclastic): are curved on one linear axis and are a part of a cylinder or cone in the form of barrel vaults and conoid shells. ❖ Double curvature shell: are either part of a sphere, or a hyperboloid of revolution. ❖ The terms single curvature and double curvature do not provide a precise geometric distinction between the form of shell because a barrel vault is single curvature but so is a dome.
- 7. DOUBLY CURVED SHELLS They are mainly classified as: 1) Synclastic 2) Anticlastic Synclastic shells: These shells are doubly curved and have a similar curvature in each direction. A dome is a good example of a synclastic shell, it is doubly curved and can be formed by rotating a curved line around an axis. A dome can be split up into two different directions; vertical sections separated by longitudinal arch lines (also called meridians), and horizontal sections separated by hoops or parallels.
- 9. CENTERING OF SHELLS Centering is the term used to describe the necessary temporary support on which the curved R.C.C shell structure is cast. The centering of a barrel vault, which is part of a cylinder with same curvature along its length; is less complex. The centering of conoid, dome and hyperboloid of revolution is more complex due to additional labour and wasteful cutting of materials to form support for shapes that are not of uniform linear curvature. The attraction of shell structures lies in the elegant simplicity of curved shell forms that utilise the natural atrength and stiffness of shell forms with great economy in the use of materials.
- 10. COMPONENTS OF SHELL STRUCTURE ● The structural skeleton and foundation ● Electrical and plumbing systems ● Base plant ● Building cladding ● The building envelope ● Fire barriers ● Fire detection system ● Pathways, boundary walls, ● Pavement, and fencing ● Landscaping ● Signage
- 11. APPLICATIONS OF SHELL STRUCTURE ❖ The shell structure is typically found in nature as well as in classical architecture. ❖ The shell structure is commonly used in seismic zones where structures undergo seismic loads.The reason of using the shell structures in the earthquake-prone areas is that it has high strength with respect to its self-weight. ❖ Shell Structures are generally used to cover the larger area of the building where the interior of the building has no columns and walls to support the flat slabs ❖ Industrial structures: – silos, tanks, cooling towers, reactor vessels etc. ❖ Auditoriums and food courts
- 12. ADVANTAGES ❖ Used for long spans hence we get column free space ❖ Light weight ❖ Less rigid as compared to solid structures ❖ Economically viable ❖ Minimum reinforcement ❖ Simple Design ❖ More Strength Compared With Other Structures ❖ Attractive And Decorative Appearance
- 13. DISADVANTAGES ❖ Complicated form work and cannot be reused ❖ Labour Cost Is High In Shell Structure ❖ Tiny Cracks Or Scratches Cause The Whole Structure Weak ❖ Can Be Affected By Temperature ❖ Construction Can Be Slow And Difficult
- 14. EXAMPLES OF SHELL STRUCTURES IN INDIA LOTUS TEMPLE, DELHI MATRIMANDIR, AUROVILLE, TAMIL NADU KANTEERAVA INDOOR STADIUM, BANGALORE