Design Criteria Auditoriums

8/13/2019 Design Criteria Auditoriums

1/19


2/19

Introduction

Auditorium an enclosure covered or open where people can

assemble for watching a performance given on the stage .

basically ,in a place of enjoyment and recreation one of the

most important building for reducing the stern in todayslife.In this modern age as scientific technology in

developing more and living standards becoming so high , as

it become important that the building should not only fulfill

the practical and functional requirement but also should

awake the aesthetic and emotional sense of the beholder.This generation the need evolve the guidelines for comfort

conditions which can be achieved by lighting applications,

acoustical treatment , sitting arrangements and sevices .


3/19

Planning

Every member of the audience should have an unobstructed

view of entire stage ,without visual and physical distortion

The auditorium should be suitable for sound reproduction and

free from distortion .

There should be a reasonable balance between : viewing

condition , seating condition and circulation requirement

The number of seats determines the no. of exits to be provided

,foyers and other amenities must be proportionality arranged


4/19

Viewing ConditionsThe size and the position of the stage must relate to the size and shapeof the auditorium

The distance of the stage from the 1strow shall be minimum 2/3rdof the

stage width.

The maximum distance of sitting from stage is recon-mended as 5 times

the width of the stage.

The overall length of rear sitting should be 3.0 times the width of stage.

The first row of seats should not be closer to the stage .


5/19


6/19


7/19

VolumeThe volume provided in the hall is such that each person is

provided a space of about 3.75 to 4.5 cu.m.per person.

Ratio of h:w:l is 1:2:3 for the approximate 800 to 1000 capacity

of Size depend upon the seating capacity , shape of the

auditorium depends upon the acoustical requirement.


8/19

Walls

Rear wall may be curved or straight.

The difference in shape of the auditorium ,thus lies in the

pattern of the sidewalls, they may be rectangular or parabolic.

The rear wall does not follow the line of curvature of the lastseating row


9/19

Ceiling

The ceiling of the auditorium is not provided as a flat

horizontal surface as this type of ceiling causes uneven

distribution of sound and creates flutter and echoes. This

ceiling is applicable up to 400ppl.e.

Splayed ceiling with splays rising towards rear reinforced

the rear seats.

Ceilings are principally sound disturbing surface and need

no sound absorbing material, if properly designed.


10/19


11/19

SittingCAPACITY

In modern auditorium with seat spaced minimum 90 cm back to back ,

the toral area of the auditorium is sq.m divided by 1.05 will give

seating capacity .

SITTING ARRANGMENT

Back to back spacing between two rows shall be 0.9 to 1.0 allows

0.45 moving space b/w two rows .

To avoid physical discomfort , occurs when vertical viewing angle to

top of stage is exceeding 35 deg or the lateral viewing angle to

centerline of the stage exceed 15 deg.

To compensate for this excessive lateral viewing angles the seat rowsshould be angled or curved.


12/19


13/19


14/19

Dimensions of seatsMinimum width of seat with armrest shall be 50 cm.

Without armrest 40 cm.

Minimum back to back distance between roes of seats shall not

be less than 90 cm and preferably 100 cm

Minimum riser in floor required = 15 cm.

There should be free access to exit-therefore seating

arrangement should be accordingly

In all the cases there shall be an intervening space of at least 43

to 45 cm between the back one seat and the front of the seat

immediately measured behind between perpendicular .


15/19

AislesIt depends upon the width of auditorium and no. and widthof seating block .

Up to 200 persons single central aisles.

200-500 persons two aisles at the twosides of the auditorium

above 500 persons four

maximum no. of seats between two adjacent cross aislesshall not exceed 10 cm.

minimum clear width of the aisle shall be 1.20m.

minimum clear width of the cross shall be 1.50m.


16/19


17/19

BalconyWhen large seating is required, balcony is necessary, to avoid

the excessive viewing distance that would otherwise develop

The height between the floor of auditorium and floor of

balcony shall not be less than 3.0m.

The floor of the highest part of the balcony and lowest part ofceiling over it shall not less than 3.5m.

The riser provided in the balcony shall not be less than 19.0m.

The rear most seat on balcony shall not make an angle less than60 deg with screen

Length of the balcony shall be maximum 1/3rdof the total

length of the auditorium.


18/19

Acoustical TreatmentTo attain these design conditions, all of the exposed wall, floor ,

and ceiling surfaces must be addressed and acoustically treated aseither reflective or absorptive. The design must also exercise care

in the selection of upholstery fabrics , curtains, draperies, and

seating, as these materials could provide excess sound absorption

and create deadness In the room . resonators or hollow cavities

within the room configuration must be avoided or specificallydesigned as they represent another method of

absorption.Reflecting panels are added within the auditorium to

enhance the room acoustics. these panels provide multiple

functions within an auditorium . they act to reflect the natural

sound of the performance into the audience. They add to the

diffusion of sound as well as dissipate any potential standing

waves or echoes.


19/19

A 3/8-inch thick plywood panel ,weighing 0.9 psf andspaced 1 inch from a wall surface, has a resonant frequency

of 179 Hz and thereby provides selective sound absorption

at this frequency .

A 1-inch thick structo-base plaster panel , weight of 10 psf,located 6 inches from a rigid wall has a resonant or natural

frequency of 22 Hz and therefore is an excellent material

to reflect sounds above this frequency .

Thus ,a reflector panel should have sufficient mass so thatits resonant frequency will be lower than the range of

frequencies of programmed material.

Design Criteria Auditoriums

Documents

Transcript of Design Criteria Auditoriums