GYPSUM

BOARD
FOR RT 60 CALCULATION FOR AUDITORIUM
ACCOUSICS
CONTROL

6000.0
ROOM CONSIDER L = 27.5M B= 27M H= 6M
BACK
STAGE THEREFORE VOLUME OF AUDITORIUM = 4455 CU M

STAGE 1000.0 6MM CARPET

FLUSH FOR CALCULATION,

900.0
TO FLOOR RT = 0.16 X VOL. OF AUDITORIUM/ TOTAL ABSORBING POWER

WHERE, A = a1s1+a2s2+a3s3......
a = AREA OF SURFACE COEFFICIENT OF ABSORPTION
SECTION AT AA' s = TOTAL SURFACE AREA

FOR FLOORING,
GREEN GREEN FLOORING AREA = 27.5X27 = 742.5SQ M
ROOM ROOM SURFACE COEFFICIENT OF FLOORING s1 = 0.30
(FEMALE) (MALE) (CONSIDER CARPET 6MM FLUSH TO FLOOR)
= 742.5X0.30 = 222.750------------a1s1

FOR CEILING,
CEILING AREA = 27.5x27 = 742.5 SQ M
SURFACE COEFFICIENT OF CEILING s2 = 0.07
(CONSIDER GYPSUM BOARDS ON STUDS OR JOIST)
STORE ROOM =742.5X 0.07= 51.975---------a2s2

FOR WALL,
CONSIDER 10% ACOUSTIC TREATMENT TO THE WALLS
SURFACE COEFFICIENT OF WALL s = 0.07
(CONSIDER .02 FOR GYPSUM AND PLASTER WALL)

FOR STAGE SIDE WALL=75X0.02=1.5 ---------a3s3

FOR SIDE WALL2 = 99X0.02 = 1.980 ---------a4s4
1200.0

FOR SIDE WALL2 = 99X0.02 = 1.980 ---------a5s5

FOR BACK WALL4 = 72X0.02 = 1.440 ---------a6s6

BACK
STAGE
27000

A CONTROL A' FOR SEATING,

STAGE
11000.0

3000.0 CONSIDER FULLY OCCUPIED SEATING AREA OF 0.72PERSON/SQ.M

ROOM
=169.0/.72 = 234.72
3471.9
5000.0
COEFFICIENT OF SURFACE ABSORPTION IS .65
234.72X.65 = 361.11--------------a7s7
1500.0
TOTAL RT 60 = 0.16XV/A
= 0.16X4455/642.3
= 1.08

FOR GOOD ACOUSTICS THE RT60 SHOULD BE LESS THAN

1.1 AND GREATER THAN 0.8
SO, THE RT60 VALUE FOR AUDITORIUM IS 1.08 WHICH CAN
MAKE AUDITORIUM ACOUSTICALLY GOOD.
3197.3

SURFACE MATERIAL SURFACE

COEFFICIENT

MALE WALL 10% GYPSUM BOARD 0.02

TOILET
CEILING GYPSUM BOARD ON 0.07
STORE ROOM FEMALE STUD OR JOIST
TOILET FLOORING CARPET 6MM THK FLUSH 0.30
AUDITORIUM PLAN TO FLOOR

27500

REMARKS SIGN STAMP S.B. PATIL COLLEGE OF ARCHITECTURE AND DESIGN

AUDITORIUM RT 60 CALCULATION NAME : ANIKET WAYAL

T.Y. B.ARCH
SUBJECT- BS IV
SEC : A ROLL NO : 170040
SEMESTER- VI SCALE- 1:50