Calculation Curtain Wall

SURATH WICKRAMASINGHE ASSOCIATES

PROPOSED MULTI STOREYD BUILDING AT CENTRE FOR BANKING STUDIES RAJAGIRIYA DESIGN CALCULATION FOR CHECKING OF STEEL STRUCTURE OF CURTAIN WALL

DESIGN BY : DAMITHA RANASINGHE BSc. Eng. (Hons.), AMIE(SL) CHECKED BY : M.C.R. KUMARA DATE : 08-12BSc. Eng. (Hons.), MIE(SL), 2014 C.Eng

STRUCTURAL CALCULATION REPORT FOR CURTAIN WALL Refer Drawing CBBC-DET-01_02_03_04 Code Reference : BS 5950 – Part I : (2000) Material Properties Specific Gravity of Glass = 25 kN/m3 Specific Gravity of Steel = 78 kN/m3 Weight of 200x80x7.5 Channel = 24.6kg/m Strength of Structural Steel = S 275 Grade of Steel Bolts = Grade 8.8 Load Calculation Floor to Floor Height =4m Thickness of Glass Panel = 8 mm Weight of Glass = 25 x 4 x 0.008 kN/m = 0.8 kN/m Area of 170 x 100 x 7.5 Box Section = 3825 mm2 Weight of 170 x 100 x 7.5 Box Section = 0.3 x 4 = 1.2 kN Shear Force due to Dead Loads = 0.8 x 3 + 1.2 = 3.6 kN Bending Moment

= 3.6 x 0.2 kNm = 0.72 kNm

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Check for Shear of bolts No. of Bolts used =4 Shear Force per bolt (Fs) = 0.9 kN Diameter of Bolts = 12 mm Area of a bolt (As) = 113 mm2 Shear Strength of bolts = 250N/mm2 Shear Capacity (Ps) = 113 x 250 kN = 28.25 kN per bolt Fs < Ps Hence OK.

(Cl 6.3.2)

Check for Tension of bolts Moment Resistance of Bolt Group M= 2 Ft (y12+y22) / y2 y1 = 50 mm y2 = 150 mm 0.72 = 2 x Ft (0.052 + 0.152) / 0.15 Maximum Bolt Tension (Ft) = 2.16 kN Tension strength of a bolt = 450 N/mm2 Tension Capacity of a bolt (Pt)= 113 x 450 kN = 50.85 kN Ft > Pt Hence OK.

(Cl 6.3.4)

Check for Combine Shear & Tension (Cl 6.3.4.4) (Ft / Pt) + (Fs / Ps) = (2.16/50.85) + (0.9/28.25) = 0.07 < 1.4 Hence OK. Check for Welded joint

(Cl 6.8.7)

Fillet Weld leg length (s) Weld Electrode Class Design strength of fillet weld (pw) Length of the weld Capacity of welded joint 369.6 kN

= = = = =

Shear Force at welded location Hence OK.

= 3.6 kN

Checking for Shear of Plate

6 mm 42 220 N/mm2 200 mm 220 x (0.7 x 6) x 10-3 x 2 x 200 =

(Cl. 4.2.3) 2

Thickness of MS plate = 8 mm Shear Area (Av) = 0.9 x 8 x 200 mm2 = 1140 mm2 Shear Strength of S275 (ps) = 0.6 x 275 N/mm2 = 165 N/mm2 Shear Capacity (Ps) = 165 x 1140 x 10-3 kN = 188.1 kN Shear Force at plate

= 3.6 kN

Hence OK.

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