Analysis and Design of a Multi-Purpose Auditorium using STAAD.Pro v8i

BY GROUP : 13V. KRISHNA MADHUKAR 12241A01B6V. V ISHNU S AI 12241A01B7

R. SAI DEEPAK VARMA 12241A01A6 J . RAJENDER 13245A0122

J .RAJKUMAR 12241A0182

UNDER THE GUIDANCE OF DR . C . L AVANYA

DEPARTMENT OF C IV IL ENGINEERING

IET

ABSTRACT An Auditorium is a room built to enable the audience to hear and watch various activities such as performing arts, conducting

cultural events, professing lectures, and carrying out various presentations and seminars. As it could be used for all the

occasions stated above it is called as Multi-purpose Auditorium.

This project deals with the “ANALYSIS & DESIGN OF AN MULTI-PURPOSE AUDITORIUM USING STAAD.Pro v8i”. The design will

be in confirmation with IS 456:2000 and SP16 for plain and reinforced concrete, IS:875-1987 Part 1,2,3 for Dead load, Live load

and Wind load calculations,IS:1893-2002 for Seismic loads and IS 2526:1963 for acoustic design.

The plinth area of the proposed Auditorium is 1900 Sq m with a Seating capacity of 750 Nos, height of the Auditorium will be at

two levels +4.35m and +7.325m. M30 Grade of concrete and Fe- 500 steel will be used for all VRCC (Vibro-Roller compacted

concrete) works. Bored cast-in-situ end bearing piles with M30 grade of concrete will be used for foundation works.

PLAN & DETAILS Plinth area of the proposed

Auditorium is 1900 Sq m

Seating capacity of 750 Nos

height of the Auditorium 7.325m

Bored cast-in-situ end bearing piles

Analysis The procedure followed in analyzing the auditorium is:

1. Generating the STAAD.Pro model

2. Assigning assumed cross sections

3. Assigning different types of loads and defining load combinations

4. Run the analysis

5. Verify STAAD output

Model in STAAD.Pro

THUMB RULESPAN LENGTH BEAM DEPTH

Upto 4m 300mm

Upto 6m 450/500mm

Upto7.5m 600mm

Upto 9m 750mm

Upto10m 800mm

Upto 12m 900mm

LOAD DETAILSDead load

Self weight of structure (FACTOR 1)15 KN/m ( Wall load)2.7 KN/ m (Parapet wall)7.5 KN/m (Green Room)4.625KN/m2 (Floor load)

Live Load1.5 KN/m2

Shear force in Y direction

Bending Moment in Z direction

DESIGN The structural elements that are to be designed are

1. SLABS

2. BEAMS

3. COLOUMNS

4. FOUNDATION

Apart from Structural Design Auditorium has to be designed with proper Acoustics

SLAB PANEL @ 4.25 m LvlLoad Details

DL : Self weight of slab : 25 KN/ m2

Floor finish : 26.7KN/m2

LL :Assembly with fixed seats : 4KN/m

Factored Load : 14.775 KN/m

ROOF SLAB @ 7.325m LvlLoad Details

DL : Self weight of slab : 25 KN/ m2

Floor finish : 26.7KN/m2

LL : Sloping roof upto 10 degrees when access is not provided : 1.75 KN/m

Factored Load : 10.38KN/ m

BEAMS There are different beams with different sectional properties, such as..

0.13 X 0.23

0.38 X 0.23

0.43 X 0.3

0.52 X 0.3

0.73 X 0.3

0.88 X 0.3

1.2 X 0.45

Sample of Beam Design through STAAD

COLUMNSDIFFERENT SETS OF COLOUMN SECTIONS ARE..

0.3 X 0.45

0.3 X 0.6

0.53 X 0.3

0.75 X 0.3

1.2 X 0.45

0.6 Dia

Sample of column Design through STAAD

FOUNDATION Steps to be followed in designing through STAAD Foundation:

1. Import STAAD File

2. Generate load combinations

3. Column positioning

4. Defining design parameters

5. Pile arrangement

6. Run analysis

7. Study design results

Generate load combinations

Column positioning

Defining design parameters

Pile arrangement

3D View of the Auditorium

Terminology Auditorium

Foyer

Lounge

Proscenium

Rear wall

Balcony parapet

Raking of Seats

Reverberation

Echo

Acoustic Requirements a) correct reverberation time, b) absence of echo, c) correct loudness level at all parts of the hall, d) low background noise,

General Principles of Acoustic design

1) Site selection

Depending on ambient noise level

Background noise should not be more than 40-45 dB

2) Size and Shape◦ in relation to the number of audience required to be seated.◦ Avg height – 6 to 7.5 m, Fan shape is considered best, sidewalls shall not be more

than 100 degrees, Farthest seat shall not be more than 23 m with the curtain line

3) Stage

Depends upon the type of Performance the hall is to cater for,

4) Roof and ceiling False ceiling, Sound proof material

Rear portion of ceiling is treated with sound absorbing material

5) Floor Successive seats have to be raised over preceding ones, so that the listener head is about 12 cm above

the path of sound, which would pass over the head of the front person. Angle of elevation of the inclined floor in auditorium should not exceed 8degrees 20% of the seating area should be allocated for lobby, Foyer

6) SeatsThe angle subtended with the horizontal at the front most observer Should not exceed 30 degreesDistance between the stage and front row should be 3.6m – 4.5mWidth of seat – 45- 56 cmDistance between seats back to back – 85 - 106cm

7) Reverberation time :

Reverberation time is defined as the time it takes for an impulse of sound in a room to decay 60 dB, or one millionth of the original level. This value is affected by most everything in the room, including room volume, absorption of room materials, diffusion from surfaces, and room temperature and pressure

8) Distribution of Acoustic MaterialThose areas which cause objectionable sound reflection and need to be treated with sound

absorbents should be earmarked for treatment with sound absorbing material. These areas are (a) the rear wall,(b) the balcony parapet,(c)any areas which may reflect sound back to the stage,

(d) concave areas

9) Sound Absorbing MaterialsIn an average hall, most of the absorption is provided by the audience. It is therefore, becomes

desirable to introduce special absorbers(such as wooden panelling) on ceilings and walls which will provide the requisite amount of absorption so as to achieve optimum reverberation-time.

ADDITIONAL SCOPE Carrying estimation and costing of the project

Scheduling of the project by brainstorming various activities and time required for each activities

Managing construction phase using various project management tools like MS Project and Primavera.

ConclusionThis project concerns the feasibility of construction of an auditorium with good acoustic properties.It involves the application of earlier coursework to carry out the analysis and design of components of structure.It was analysed using STAAD.Pro using generic loading, and AUTOCAD for drawing and detailing the c/s and l/s of structural members.The construction of auditorium presents a solution for many cultural programmes being held.

References https://www.academia.edu/6029955/ANALYSIS_DESIGN_ESTIMATION_OF_CIVIL_ENGINEERING_PROJECT

https://www.wbdg.org/design/auditorium.php (WBDG National institute of Building sciences)

http://www.acoustics.asn.au/conference_proceedings/ICA2010/cdrom-ISRA2010/Papers/P3d.pdf

Howard Latham, Subjective Measurements-Practice, The Measurement of Quality in Auditorium Acoustics by Subjective Scaling Methods - A Review of Developments in Theory and Practice, 1983, Pg. No. 1, 9

Howard Latham, Summary, The Signal-To-Noise Ratio for Speech Intelligibility- an Auditorium Acoustics Design Index, 1979, Pg. No. 1

Video tutorials for STAAD Software

For Plans : bhargav buildpro technologies pvt. ltd

IS: 456 (2000), Plain and Reinforced Concrete Code Of Practice, Bureau Of Indian Standards, New Delhi.IS: 875 (Part I) (1987), Code of practice for design loads (other than earthquake) for buildings and structures Part I Dead Loads – Unit weights of building materials and stored material.IS 875 (Part II) (1987), Code of practice for design loads (other than earthquake) for buildings and structures Part II Imposed loads.IS 875 (Part III) (1987), Code Of Practice For Design Loads: Wind LoadsSP: 16, Design aid for reinforced concrete structures to IS: 456 (1978)IS 2526:1963, Code Of Practice For Acoustical Design Of Auditorium And Conference Halls