Boss Suggestion Regarding Short Column & Concrete Strength

Where designing a RCC Base Column the minimum size is 16”X16”

In practical while using stone chips the f’_c is found 3500 psi (1:1.5:3)

While using Brick chips the f’c is found 3000 psi (1:1.5:3)

While using Brick chips the f’c is found 2500 psi (1:2:4)

Boss Suggestion Regarding Connection Plate Bolt Spacing

In a connection plate minimum bolt-bolt distance is 2.5d to 3d. And edge distance is 1.5d

Boss Suggestion Regarding Shop Drawing 1

1. In rafter, generally connection plates are provided after 8m distance for transportation easiness.

2. Purlin-purlin distance should be maximum 1300 mm or 4 ft.

For Fabrication Drawing following drawings are done,

a. Proposal drawing

b. Erection drawing

Anchor bolt layout

Anchor bolt details

Steel column layout

Rafter layout

Sections

Purlin layout

Wall girt layout

Roof sheet layout

Wall sheet layout

c. Fabrication/ shop drawing

1.       Individual details of

a.       Column

b.      Rafter

c.       Purlin

d.      Accessories

Boss Suggestion Regarding Column To Building Out

In drawing my suggestion bay spacing @ 7600 mm and steel column center to outer of building will be 350 mm (150+200) considering 150 brick wall. If bypass type then center to outer of building will be 425 mm (150+25+250) considering 250 brick wall. 

Skylight/Transparent Sheet Instructions

Skylight should be 840X3048 in mm

Where effective is 820X2850 in mm

The code says it should be 2.5-3% of total Area (SFT).

Steel Plate Found In Bangladeshi Local Market

1. 4 mm
2. 5 mm
3. 6 mm
4. 8 mm
5. 10 mm
6. 12 mm
7. 14 mm
8. 16 mm
9. 18 mm
10. 20 mm
11. 22 mm

Load Calculation For Simple Pre-fabricated Steel Structure

Load Calculation:

Purlin (200 C 20) = 5.5 Kg/m = 5.5*9.81/(1.2*1000)=0.045 KN/m²; [In general spacing between Purlin is
kept 1200 mm]

Roof Sheet (0.47)=0.47*7850/(1000*.82)=4.5 kg/m² ;
[In a 1m coil 820mm sheet will be found after profile has been made]
=(4.5*9.81)/1000=0.044 KN/m²
= 0.089 KN/m²

Total Load of Purlin & Roof Sheet= (0.045+0.044) KN/m²

Dead Load=0.089*6.1=0.54 KN/m
Live Load=0.57*6.1=3.48 KN/m
L/B=30/30.5=0.98
h/B=6/30.5=0.2
h/L=6/30=0.2

qz= CcC1CzVb²
=47.2X10ˉ⁶X1X0.415X250²=1.224 KN/m²

For,
Wind Ward Wall Pz=CGCpeqz=1.592X0.8X0.224=1.56 KN/m²
Wind Ward Roof Pz=CGCpeqz=1.592X0.81X0.224=‐1.58 KN/m²
Leeward Roof Pz=CGCpeqz=1.592X0.7X0.224=‐1.364 KN/m²
Leeward Wall Pz=CGCpeqz=1.592X0.5X0.224=‐0.974 KN/m²

Force
Windward Wall=6.1X1.56=9.516 KN/m
Windward Roof=6.1X1.56=‐9.628 KN/m
Leeward Roof=6.1X1.364=‐8.32 KN/m
Leeward Wall=6.1X0.974=‐5.943 KN/m