Reverberation chamber

The chamber is supported by springs on its perimeter. The design live load for the floor is equal to 250 kgf/m2. The design live load for the ceiling is equal to 50 kgf/m2.

Specific weight (concrete) = 2320.0 kgf/m3
Surface (ceiling) = 10.9 m2
Volume (wall, ceiling) = 4.8 m3
Wall perimeter = 12.82 m

Spring

FDS-1-5730-B
rated capacity = 2599 kgf
rated deflection = 2.5 cm
k = 1.0396E+03

Model 1

Displacements

The following table shows the vertical displacements of the top corner nodes, counterclockwise starting at the node on the left side of the door.

Node Displ Z
# #
264 -0.9 cm
251 -1.0 cm
369 -1.2 cm
509 -1.2 cm
665 -1.1 cm

Reactions

The following table shows the vertical reactions of the bottom nodes, counterclockwise starting at the node on the left side of the door.

Node Force Z
   
1199 965.5 kgf
1200 989.6 kgf
1201 1013.7 kgf
1202 1036.6 kgf
1203 1097.7 kgf
1204 1158.7 kgf
1205 1218.3 kgf
1206 1241.1 kgf
1207 1263.1 kgf
1208 1284.5 kgf
1209 1230.7 kgf
1210 1175.3 kgf
1211 1120.0 kgf
1212 1068.5 kgf
1213 1017.7 kgf

Stresses (floor)

Vibration frequencies

Model 2

The weight of the wall, the weight and the live load of the ceiling were applied as force on the edges of the floor. The force/length on the edge can be calculated as (4.8 * 2320.0 + 10.9 * 50) / 12.82 = 911 kgf/m.

Stresses (floor)