Week 2 Challenge

Ans 1 -

Aim- To Calculate net section area of tension member of given figures.

Given data-

Plate width b= 260mm,  thickness of plate t= 20mm, Bolt Size =20mm

Bolt hole dia d_h =20+2 = 22 mm

As per IS-800.2007 Clause-6.3

Net area of cross section A_n = (b-n d_h) t = (260 – 4 X 22) X 20 = 3440 mm²

Plate – Zigzag bolting

Angle (200 x 100 x 12 with M20 bolt)

2. Sag rod design problem

Design a sag rod as shown in Figure below. Purlins are supported at 1/3^rd points by sag rods.

Assume centre to centre distance of Rafter spaced at 8 m , spacing of purlin = 1.2 m, Self weight of roofing (including thermal insulation)= 60 kg/m² , Wind pressure intensity = 150 kg/m²,Slope of rafter = 15 degrees, Live Load =75 kg/m². Assume self weight of purlin as 100 kg/m.

Ans 2 -

Aim - To Design of Sag Rod 

Procedure- 

• Calculate Total Dead Load and Live Load
• Load calculation at sag rod
• Calculate required net area and size of rod

Calculation of following Attachment.

Ans 3 -

Aim- Design a tension member of single angle as per Indian Standard and Checking section

Procedure - 

• Calculate required area of cross section from given factored load
• Choose an angle section from required area calculated
• Calculate design strength of the member due to yield
• Calculate design strength of member by reputure of net section
• For a given member assume welding with welding length and calculate block shear capacity

Calculation as per following attachment-