Project 2_Design & Analysis of a Hostel building at Guwahati, Assam
Q1).
Data required for ETABS analysis :
- Pinned support, Base + 5Story (Plinth To Roof) + 1 Mumty
- Column 450mm x 650mm, Beam 400mm x 500mm, Slab 150mm thick, No shear wall necessary.
- Floor live load 2KN/m2
Terrace live load 1 KN/m2
Floor finish + Ceiling finish 1 KN/m2
Partition wall load 3.5 KN/m
Balcony wall load 1 KN/m
- Guwahati seismic zone-v
Set Grid as per given dimensions
Set story with proper height
Add Column properties Column sized as 450x650 :
Set slab properties thickness as 150mm :
Create appropriate column and beam
Create slab as per given dimensions:
Define load patterns :
- Define Load Values
- Live load from IS 875 Part-2 = 2KN/m^2
- Thickness X height X Density => 0.2m X 3.5m X 550 kg/m^3 = 385 kg/m = 385/100 = 3.85kn/m =3.9 kn/m
- Floor finish = 1.5kn/m^2
- Define Mass sources/ load cases
Define load cases
Define load combinations:
- Define Diaphragram
- Check modal after run analyisis
- Check Maximum story drift not excceding 0.004 (as per code)
- EQx is 0.002209 <0.004 (ok)
- EQy is 0.002599 <0.004
Result :-
- BOTH (EQx or EQy) OF THE STORY DRIFT ARE WITHIN THE CODAL LIMITS WHICH IS 0.004MM OR 4M.
Concrete Design Check:
- Now Lets Transfer the Load, Base reaction, grids or etc from Etabs to Safe22
GIVEN DATA:
⦁ Column Size : 450 mm X 600mm and 600mmX450mm.
⦁ Soil Type : III.
⦁ Length of the piles : 10m.
⦁ Pile Diameter : 500 mm diameter.
⦁ Load Carrying Capacity of Pile: 280 KN.
⦁ Pile Cap - Slab type _ Matt of 50 mm thickness.
⦁ Column Cap - Slap type - Stiff of 500 mm thickness.
⦁ Pile length : 16 mm
⦁ Soil Bearing Capacity : 150 KN/sq.m.
⦁ So the first step is to define the materials and the section property.
⦁ After that there will be another dialouge box named as the Define Materials.
⦁ Define the material properties
- Add Slab property
- First add footing/Pile CAP( in later i will increase the depth upto 1200mm)
- First add Column ( which is stiff)( in later i will increase the depth upto 1200mm)
- Also Add Plie (Dia of Pile is 500mm) (which is Footing) ( in later i will increase the depth upto 1200mm)
- Calculate soil Subgrade / point Spring Constant
- Piles in the springs are defined as spring so for that the spring constant
K=EA/L
E-5000 * (fck)^0.5=> 5000(25)^0.5= 25000 N/mm 2
Area of pile = (3.414 * d^2)/4 => 3.142 (500)^2/4 => 196350mm^2
L= 10000mm (10m)
K= 25000*0.7855/16-306835.9N/mm= 490875N/m => 490.875 KN/m
- Soil type 3
Safe bearing capacity X factored to ultimate / Maximum settlement
=> 150 X 3 / 0.05 = 9000KN/m^2
- Check All Loads, Load combo, load pattern are available
- Firstly Placed Pile Cap of Dim-2500mmX2500mm( Some point it will vary)
RESULT :
FINALLY, succeesfully designed and analyzed the model in Etabs.