Week 2 Challenge

1)

AIM:

To Calculate the net section area for the tension member as shown in Figure below

PROCEDURE:

RESULT:

Hence the net sectional area for the given three cases are obtained and the values are:

NET SECTIONAL AREA = 2064 mm^2

NET SECTIONAL AREA = 2189 mm^2

NET SECTIONAL AREA = 2810.9 mm^2

2)

AIM :

To design a sag rod for given load conditions

PROCEDURE:

Center to Center Distance between Rafter = 8 m

Spacing of Purlin =1.2m

Self Weight of Roofing = 60 kg/m ^ 2

Wind Pressure Intensity = 150 kg/m ^ 2

Slope of Rafter = 15 degree

Live Load = 75 kg/ m ^ 2

Self Weight of Purlin = 100kg / m

Total Factored Load (kN) = (Dead Load + Live Load) x Factor of Safety x 9.8 x Spacing of Purlin x Distance between Rafter

Total Factored Load = (60 + 75) * 1.5 x 9.8 * 1.2 * 8 = 19051.2 N = 19.0512 kN

Now, calculating Load on Each Sag Rod = (Total Factored Load/3 + Load due to Self Weight of Purlin/3) x sin(15) )

Therefore, Load on Each Sag Rod = 2.3199 kN = 2319.9 N

Since, We know load on threaded rod is tension force,

Therefore, Design Tension Force (Tdn) = 0.9 * Net Area * fu /1.25

Tdn = 0.9 * An* fu/1.25

An = (Tdn* 1.25)/(0.9*fu) - (Let fu = 250MPa)

An = 12.88 mm ^ 2

Since, An = pi/4 * d ^ 2

Therefore, Diameter of Sag Rod = 4.049 mm < 16 mm

Hence, we will provide Sag Rod of 16 mm.

Result: We will provide Sag Rod of Diameter = 16 mm.

3)

AIM:

To Design a single angle member for the given loading conditions

PROCEDURE:

RESULT:

Hence ISA 150 X 150 X 12 section is safe under given loading conditions