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Floor Pressure:
FloorPressure=PeopleNumbers*PeopleWeight / Area .

EX:
One classroom area=10*10 can hold 300 people.
1). If the weight is using most weight 300kg, the pressure =(300*300kg)/(10m*10m) = 900kg/m*m;

2). If the weight is using average [(300kg+50kg)/2 *300/(10m*10m) = 175kg*3/m*m = 525kg/m"m

3). SteelNet(6cmSpaces + 2cmBar) which area = [(10*100)cm/6cm]*[(10*100)cm/6cm] = 166.7cm*166.7cm = 27783.3cm"cm= 27.8m*m
So the pressure = 300*300kg/27.8m*m = 3237.4kg/m*m

SidePressure = (1/3)FloorPressure.

Notes: Choose materials pressures list. General using real testing.