DESIGN BY : DAMITHA RANASINGHEBSc. Eng. (Hons.), AMIE(SL)

CHECKED BY : M.C.R. KUMARABSc. Eng. (Hons.), MIE(SL), C.Eng DATE : 08-12-2014

SURATH WICKRAMASINGHE ASSOCIATES

PROPOSED MULTI STOREYD BUILDING AT CENTRE FOR BANKING STUDIES - RAJAGIRIYA

DESIGN CALCULATION FOR CHECKING OF STEEL STRUCTURE OF CURTAIN WALL

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/mStrength of Structural Steel = S 275Grade of Steel Bolts = Grade 8.8

Load Calculation

Floor to Floor Height = 4 mThickness of Glass Panel = 8 mmWeight of Glass = 25 x 4 x 0.008 kN/m

= 0.8 kN/mArea 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 kNShear 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

1

Check for Shear of bolts (Cl 6.3.2)No. of Bolts used = 4Shear Force per bolt (Fs) = 0.9 kNDiameter of Bolts = 12 mmArea 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.

Check for Tension of bolts (Cl 6.3.4)Moment Resistance of Bolt Group

M= 2 Ft (y12+y2

2) / y2

y1 = 50 mmy2 = 150 mm0.72 = 2 x Ft (0.052 + 0.152) / 0.15

Maximum Bolt Tension (Ft) = 2.16 kNTension strength of a bolt = 450 N/mm2

Tension Capacity of a bolt (Pt)= 113 x 450 kN= 50.85 kN

Ft > Pt Hence OK.

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) = 6 mmWeld Electrode Class = 42Design strength of fillet weld (pw) = 220 N/mm2

Length of the weld = 200 mmCapacity of welded joint = 220 x (0.7 x 6) x 10-3 x 2 x 200 = 369.6 kN

Shear Force at welded location = 3.6 kN Hence OK.

2

Checking for Shear of Plate (Cl. 4.2.3)

Thickness of MS plate = 8 mmShear 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.

3