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A grid is a planar structural system composed of continuous members that either intersect or cross each other .Grids are used to cover large column free areas and is subjected to loads applies normally to its plane . It is beneficial over normal beams as it has a better load dispersing mechanism and also this system reduces the normal span to depth ratio which helps in reducing the height of the building .Grid beams are analysed dynamically to determine the natural frequencies of the nodes of the system. Direct stiffness method for finding out the stiffness matrix and Mass matrix of the members of grid system. The lowest natural frequency will determine the minimum dynamic loading that the structure can withstand without resonance.
Beams are structural members with one dimension much larger than the other two. Examples of beams include propeller blades, helicopter rotor blades, and high aspect-ratio aircraft wings in aerospace engineering; shafts and wind turbine blades in mechanical engineering; towers, highways and bridges in civil engineering; and DNA modeling in biomedical engineering. Beam analysis includes two sets of equations: a generally linear two-dimensional problem over the cross-sectional plane and a nonlinear, global one-dimensional analysis.