Shell Roof Construction Details

Introduction lattice and portal frame buildings consist of a structural frame which supports slab roof and wall covering.

Shell roof construction details. This frame serves purely as the structural support and provides protection against weather. Queen post roof truss. Typical applications include aircraft fuselages boat hulls and the roofs of large buildings. Concrete shell structures often cast as a monolithic dome or stressed ribbon bridge or saddle roof.

The curvature of shell structures benefits from the same structural efficiency as arches which are pure compression forms with no tensile stresses. The most popular types of thin shell structures are. These elements typically curved are assembled to make large structures. Based on the roof shape and the characteristics of this project the roof is divided into three subregions section 1 section 2 and section 3 as shown in figure 3.

Thus they are widely used in roofs of large spans. The thin concrete shell structures are a lightweight construction composed of a relatively thin shell made of reinforced concrete usually without the use of internal supports giving an. The roof and wall covering add nothing to the strength the. The roof is curved and used to cover large one story buildings.

The shells arise from the association between concrete and steel and are structures whose continuous curved surfaces have a minimal thickness. Due to the large area of construction operation the construction of the roof steel structure follows the principle of subregions. Concrete shell construction techniques are well suited for complex curves and are also used to build boat hulls called ferroconcrete historically it was used by the british to create the mulberry harbours for the 1944 d day invasion of normandy. As it usually is aesthetically pleasing a shell roof is commonly used in public buildings.

Shell structures advanced building construction 1. Shell roofs can be flat but are typically curved assuming a cylindrical domed paraboloid or ellipsoid shape. Symposium on concrete shell roof construction 1957 where iv r x y is the deflection of the shell due to the determinant of this system taken equal to the moment m y at the edge x 0 assuming that zero constitutes the buckling condition of a shell 0rigidly clamped at the edge x 0 and simply v si supported along the remaining edges. These roofs are useful when the inside of the building is open and does not contain walls or pillars that could support a flat or pitched roof.

Most concrete shell structures are buildings including storage facilities commercial buildings and residential homes.