Papers by Gautam Kumar Poddar
In this chapter, initially the structural and functional requirements of industrial buildings wer... more In this chapter, initially the structural and functional requirements of industrial buildings were described. The loads to be considered were mentioned and then the floor and roof systems were explained. In particular, the steelconcrete composite slab using profiled deck sheets was explained along with the design methods. The topic of roof trusses was covered in detail.
The case study shows the behaviour of an actual space frame constructed for a typical industrial ... more The case study shows the behaviour of an actual space frame constructed for a typical industrial structure. Such frames can be provided for factories, sports complexes and airports.
Single storey industrial buildings are usually governed by wind loads rather than earthquake load... more Single storey industrial buildings are usually governed by wind loads rather than earthquake loads. This is because their roofs and walls are light in weight and often pitched or sloping and also because the buildings are permeable to wind which results in uplift of the roof. However, it is always safe to check any building for both wind and earthquakes.
In method 1, only the member sizes were treated as variables whereas the geometry was assumed as ... more In method 1, only the member sizes were treated as variables whereas the geometry was assumed as fixed. Method 2 treats the geometry also as a variable and gets the most preferred geometry. The geometry developed by the computer results in the minimum weight of space frame for any practically acceptable configuration. For solutions, since a iterative procedure is adopted for the optimum structural design, it is obvious that the use of a computer is essential.
The example chosen for optimum design is a flat space structure 16.8m x 16.8m having columns only... more The example chosen for optimum design is a flat space structure 16.8m x 16.8m having columns only on the periphery. The plan of bottom chord, top chord and bracing members are shown in
The wind pressure on a structure depends on the location of the structure, height of structure ab... more The wind pressure on a structure depends on the location of the structure, height of structure above the ground level and also on the shape of the structure.
While it is possible to design many cold formed steel members on the basis of analysis, the very ... more While it is possible to design many cold formed steel members on the basis of analysis, the very large variety of shapes that can be formed and the complex interactions that occur make it frequently uneconomical to design members and systems completely on theoretical basis. The behaviour of a component or system can often be ascertained economically by a test and suitable modifications incorporated, where necessary. Particular care should be taken while testing components, that the tests model the actual loading conditions as closely as possible. For example, while these tests may be used successfully to assess the material work hardening much caution will be needed when examining the effects of local buckling. There is a possibility of these tests giving misleading information or even no information regarding neutral axis movement. The specimen lengths may be too short to pick up certain types of buckling behaviour.
It is difficult to anticipate which of the constraints will be critical at the optimum. Therefore... more It is difficult to anticipate which of the constraints will be critical at the optimum. Therefore, the use of inequality constraints is essential for a proper formulation of the optimal design problem.
As discussed earlier, the foundations of towers are subjected to three types of loads viz., the d... more As discussed earlier, the foundations of towers are subjected to three types of loads viz., the downward trust (compression), the uplift (tension) and the side trust (horizontal shear). The soil resistances available for transferring the above forces to earth are described below.
The bracing systems discussed so far are not efficient for buildings taller than 60 stories. This... more The bracing systems discussed so far are not efficient for buildings taller than 60 stories. This section introduces more advanced types of structural forms that are adopted in steel-framed multi-storeyed buildings taller than 60 storeys.
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Papers by Gautam Kumar Poddar