Project 2_Design & Analysis of a Hostel building at Guwahati, Assam
Aim: To experience the entire design process from modelling, analysis, design, and preparation of construction drawings.
The architectural drawings of a G+3 RCC building are provided.
Location – Guwahati, Assam
Function – Hostel block in an academic institute
Codes used :
- IS 875 part 1
- IS 875 part 2
- IS 13920
- IS 1893
- IS 2911 part 2
- IS 456
- SP 34
Procedure:
Select the Indian Design parameters
Define the Material Properties
Material M25 Concrete is created
Material Fe 415 is created
Material FE 500 is created
Grid system is created as per the Given plan in the Auto CAD drawing
StoryData is created as per the AutoCAD Drawing
Frame Data Column 600*400 mm is assumed with M 25 Concrete Material
Properties of Column
Frame Data Beam 500*300mm is assumed with M 25 Concrete Material
Fe 500 steel is selected as Longitudinal Bars
Fe 415 steel is selected as Confinement Bars
Arrange the Column by Relipicate Option for Rotating 90 deg
Arrangement of columns in plinth Level
Slabs are Created with 150 mm Thickness and Membrane type Modelling
Similarly, Beams and slabs are Drawn
Frame members are Replicated in the Higher Floors
Fixed Support is provided at the Base of the Columns for all the Joints
Now Add load Patterns:
IS 875 Part 1
Dead Load = Self-weight of the Members
Brickwall load
Given AAC blocks are to be used density = 6 KN/m3 as per IS 875 Part 1
Height of the Brick wall = Floor Height - Beam depth
= 3.45 - 0.5
=2.95 m
Given thickness of Brickwall = 0.2 m
Brick wall load = 6*2.95*0.2 = 3.54 KN/m
Assume plaster thickness = 0.024 m
density of plaster = 20KN/m3
Plaster load = 0.024*20*2.95 = 1.416 KN/m
Total Brickwall Thickness = 4.956 = approx 5 KN/m for all story
For Parappet wall Total Brickwall Load = (0.9*0.2*6)+(0.9*0.024*20) = 1.5 KN/m
Given Floor finishes as Vitrified Tile
Floor finish load= 1.25 KN/m2
Floor finish + Water Proof in Toilets = 1.5 KN/m2
IS 875 Part 2
Live Loads
Room and Wardener's Room = 2 KN/m2
Recreational Room = 3 KN/m2
Kitchen Room = 3 KN/m2
Dining Room = 4 KN/m2
Toilet and Bath rooms = 2 KN/m2
Corridors and Passage = 3 KN/m2
Store Room = 5 KN/m2
Balconies = 4 KN/m2
Earthquake Load IS 1893:2016
Guwahati, Assam comes under Zone 5 as per IS 1893 2016
Based on IS 1893 for Special Moment Resisting Frames we have
Response Reduction Factor R = 5 From Table 9 for SMRF = 5
Seismic Zone Factor for Zone 5 is Z= 0.36
Assume site Type = Type 2
Importance Factor of the Building = 1
Moment Resisting Frames with Masonry Infills clause 7.6.2 c
Time period = 0.5 second
Load assignments:
Assign > Frame loads > Distributed
5KN/m for all storys
1.5 KN/m for Roof Parapet wall
Load applied on Beams
Load on slabs
Go to Assign > Shell loads > Distributed
1.5 KN/m2 for Tiles including waterproof
Go to Assign > Shell loads > Distributed
1.25 KN/m2 for Tiles
Live loads applied on Slabs
3 KN/m on Kitchen and Dining Rooms, Meeting Room etc
2 KN/m2 for all other Rooms
Apply seismic load using Mass Source Data
Define > Load Combinations
Generate the Load Combinations for all the given loads
Obtained 38 load Combinations
Assign the Diaphragm
Assign > Shell > Diaphragms
ANALYSIS:
Now ANALYSE the Structure we get the following Values:
Values of all the Reactions
Display > Show tables > Analysis Results > Structure Output > Modal Information > Table : Modal Participation Mass Ratio
In this Analysis
It is found that
UY = 70 %
UX = 69%
RZ = 70%
Hence UX should be made stiffer.
Bending Moment and Shear Force Diagrams in the Frame:
Bending Moment Diagram for Beams
Bending Moment Moment Diagrams for the Columns
Shear Force Diagram for the Columns
Shear Force Diagram for the Beams
DESIGN
The design of the Members is checked.
View of Beam Design reinforcement in Elevation View
Column Reinforcement Design
Reinforcement Details for the Column 1-A
Reinforcement Details for the Column 1-A
Beam Reinforcement Design at Plinth Level
Reinforcement Details for the Beam B 49 @ 1-A Grid line at Ground floor Level
Reinforcement Details for the Beam B 49 @ 1-A Grid line at Ground floor Level
Reinforcement Details for the Beam B 49 @ 1-A Grid line at Ground floor Level
Reinforcement Details for the Beam B 49 @ 1-A Grid line at Ground floor Level
Reinforcement Details for the Beam B 49 @ 1-A Grid line at Ground floor Level
Reinforcement Details for the Column 1-A
Reinforcement Details for the Column 1-A
Reinforcement Details for the Column 1-A
Now SAFE software is used for Foundation Design
Import the Model to Safe as F2K file
By taking all the Loads from thr upper stories
View of Loads taken from ETABS
Now Material Properties are taken M25, Fe500
Fe 500
Soil subgrade Property is considered
Slab Property is defined for Pilecap, Pile
points are drawn for creating pile caps
Pile caps are drawn as shown below using Points
Circular Piles of 500 mm dia are drawn below the PileCaps
View of Load Patterns
design Preferences selected for IS 456-2000
Now ANALYSIS is Run to get the Reinforcement Details of the Pilecaps and Pile
IS 2911 Part 1 is Considered for the Design and Construction of the Pile Foundations
Part 1 Concrete piles
Section 2 Bored cast In situ Concrete Piles
Clause 6 = Design considerations for Piles
clause 6.3 Pile Capacity
Clause 6.5.2 Lateral load Capacity
Clause 6.6 Spacing of Piles
Clause 6.11 Reinforcement Deatiling of Piles
SP34 is Hand Book on Concrete Reinforcement and Detailing
This doesn't consider the Ductile Detailing
SP 34 =Section 6 = Foundations
SP 34 =Section 7 = Columns
SP 34 =Section 8 = Beams
SP 34 =Section 9 = Floor slabs
SP 34 =Section 12 = ductility Requirements of EQ Resistant Buildings
Detailing of Pile:
Pile Cap reinforcement for different no of piles
Detailing of Pile Cap
