Challenge

Week 10 Challenge

Q1)

Given

Rafter span = 50 m

Bay spacing = 8 m

Roof slope = 1 in 10

Height of column = 12 m

Brick wall height = 2 m

Purlin spacing = 1.2 m

Girt spacing = 1.5 m

Slant length of one rafter = 25.124m

Number of purlin on one rafter= (25.124/1.2 )-1=20 purlins on one rafter

SO total number of purlin on both rafters = 20*2=40 Purlins

Number of girts = (12-2)/1.5 = 7 on one side

So for both side 7*2 = 14 Girts

Q2)Model is appended below

Q3)

Vb =	50	m/s	Ref. Annex A , IS 875 (3):2015		Chennai
k1 =	1		Ref. Table 1, IS 875 (3):2015		All general buildings and structures
k2 =	0.91		Ref. Table 2, IS 875 (3):2015
k3 =	1		Ref. Cl 6.3.3 , IS 875 (3):2015
k4 =	1		Ref. Cl 6.3.4, IS 875 (3):2015
Vz =	Vbk1k2k3k4
	45.5	m/s
Pz =	1242.15	N/m2	1.24215	kN/m2

kd =	0.9		Ref. Cl 7.2.1, IS 875 (3):2015
ka =	0.8		Ref. Cl 7.2.2, IS 875 (3):2015
kc =	0.9		Ref. Cl 7.3.3.13, IS 875 (3):2015

Pd =	804.9132	N/m2	0.8049132	kN/m2

					Taking Terrain Catagory 3 , Building Class

wall opening as 15 %
Cpi =		0.5	-0.5

Wind Pressure on Wall of the Building
Wind Angle = 0 Degree
Surface	Cpe	plus(Cpi)	minus(Cpi)	Cpe-Cpi		Pressure on Wall (kN/m2)	Pressure on Wall (kN/m2)
A	0.7	0.5	-0.5	0.2	1.2	0.16098264	0.96589584
B	-0.3	0.5	-0.5	-0.8	0.2	-0.64393056	0.16098264
C	-0.7	0.5	-0.5	-1.2	-0.2	-0.96589584	-0.16098264
D	-0.7	0.5	-0.5	-1.2	-0.2	-0.96589584	-0.16098264

Wind Angle = 90 Degree
Surface	Cpe	plus(Cpi)	minus(Cpi)	Cpe-Cpi		Pressure on Wall (kN/m2)	Pressure on Wall (kN/m2)
A	-0.5	0.5	-0.5	-1	0	-0.8049132	0
B	-0.5	0.5	-0.5	-1	0	-0.8049132	0
C	0.7	0.5	-0.5	0.2	1.2	0.16098264	0.96589584
D	-0.1	0.5	-0.5	-0.6	0.4	-0.48294792	0.32196528

Q4)

Ship work like this
in your own course.