C pi depends on the opening area in a structure. C pi is obtained from clause 7.3.2, page no 11, IS 875 part 3 2015. A = surface area of structural element or cladding unit. 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 region.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.
0 kommentar(er)
