Reference Calculation Outpu Design of Staircases: There were two staircases in the building to design. Design staircase is detailed here. Choice of layout: Floor to floor height = 3500mm No. of rises = 22 Height of rise ® = 3500 22 = 159mm <175mm and acceptable for public buildingRise=15 Going (G) = 250mm Going=2 2R+G = 2*159 +250 = 568mm (Appro. 600mm ) Hence OK. Nosing is not going to provide hence, tread and going are eq Stair span and Waist Thickness for Typical flights: Staircase was supported between two landings and landings we designed to span perpendicular to the span of flights. BS8110 Cl.3.10.1.3 Effective span = = 2.5+0.5(1.313+1.8) = 4.05m Cl.3.10.2.2 Length of stair = (2.5/4.05)*100% = 61.70% >60% Hence span/depth enhancement is possible. I.S.E. manua Assume span/depth ratio of 31 for continous oneway spanning Table3 Span/depth = 31*1.15 = 35.65 Effective depth = 4050/35.65 = 114mm Assume cover 25mm (mild exposure conditions and 2hr fire res and using 12mm bars, choose h=150mm and Waist t d=150-25-6 = 119mm = 150mm Hence waist thickness was selected as 150mm. Project: Dahampaya Feature Design of stairca DESIGN UNIT Designed Typical paln of the staircase is attached here with in figur la+ 0.5(lb,1 +lb,2) D Date