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