![]() Wind load on individual members is determined by formula which is given in IS 875 part 3, clause 7.3.1, page no 10. Tributary area = spacing or pitch × rise.K a is obtained from clause no 7.2.2, page no 10, IS 875 part-3 2015.K d is obtain from clause no 7.2.1, page no 9, IS 875 part-3 2015. For industrial structures, K 4 is 1.15.For hospitals, schools, communication towers, cyclone shelters, K 4 is 1.30.K 4 is obtained from clause no 6.3.4, page no 8, IS 875 part-3 2015.K 3 is obtain from clause 6.3.3, page no 8, IS 875 part-3 2015. K 2 is obtain from table-2, page no 8, IS 875 part-3 2015.Terrain category decided on the basis of terrain of location of structure.K 2 depends on the terrain category and height of the structure.K1 depends on the class and life of the structure.K 1 is obtained from page no 7, table-1, IS 875 part-3 2015.K 4 = Importance factor for cyclonic regionīasic wind speed at 10m height for some important cities of India as per is 875 pis tabulated below.K 2 = Terrain roughness and height factor.Design Wind Speed (V z) :įor finding design wind speed, formula given on page no 5 of IS 875 part-3 2015. ![]() Step-1 : Angle of roof trussĪngle of roof truss = tan -1( Rise/(Span/2)) Step-2 : Determining Basic wind Speed (V b)įinding basic wind speed from page no 6 or 51 of IS 875 part-3 -2015 as per location. Steps of roof truss Wind load calculation as per is 875-2015. Solved example of Wind load calculation as per IS 875-2015.Step-4: Wind load on individual members.Step-2 : Determining Basic wind Speed (Vb).Steps of roof truss Wind load calculation as per is 875-2015. ![]()
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