Aci tms 216 1 14 code requirements for determining fire resistance of concrete and masonry construction assemblies lists the minimum equivalent thickness of single layer concrete walls to meet fire resistance ratings ranging from 1 to 4 hours see table on following page.
Solid concrete wall fire rating.
A wall tested according to e 119 undergoes both fire exposure and water hose stream testing.
Aci 206 provides the definition of these two terms.
Fire endurance of structures figure 5 shows the effect of fire on the resistance of a simply supported reinforced concrete slab.
For solid walls with flat vertical surfaces the equivalent thickness is the same as the actual thickness.
As an example a wall with a fire resistance period of 2 hours and 25 minutes may only attain a fire resistance rating of 2 hours.
13 mm a 1 in.
The equivalent thickness is the theoretical thickness of the block if all the concrete was molded into a solid unit.
The standard is used to hourly fire rating and to indicate wall s its durability during a fire.
Unit width block type face shell solid equivalent thickness normal weight concrete siliceous gravel medium weight 105 125lb per cubic ft blended light weight under 105lbs per cubic ft expanded clay shale or slate 4 4 3 core regular solid.
Fire rating fire resistance of concrete masonry units is determined by the equivalent thickness of the block and the type of aggregate.
Fire endurance and fire resistance.
Fire ratings hours.
Fire resistance rating or fire rating is defined as the duration of time that an assembly roof floor beam wall or column can endure a standard fire as defined in astm e 119 3.
A fire resistance rating is based on a fire resistance period and usually given in half hour or hourly increments.
It is calculated by multiplying the actual thickness by the percent of solids.
The requirements of astm c55 astm c73 astm c90 or astm c744 refs.
The values in table 722 2 1 1 apply to plain reinforced or prestressed concrete walls.
A fire resistance rating between the hourly fi re resistance rating periods listed may be determined by linear in terpolation based on the equivalent thickness value of the concrete masonry unit.
The minimum equivalent thicknesses of cast in place or precast concrete walls for fire resistance ratings of 1 hour to 4 hours are shown in table 722 2 1 1.
25 mm thickness measured perpendicular to the face of the wall of ceramic fiber in the joint can be used in walls with fire resistance ratings up to 3 hours while a 2 in.
For example for an 8 in.
These values are for solid walls or slabs.
6 6 6 2 core regular 2 core 75 solid solid.
51 mm thickness can be used in the joints of a 4 hour wall.
Fire ratings of concrete and masonry structural elements considers two factors.
It is also referred to as a fire rating fire resistance classification or hourly rating.
Fire resistancerated wall assembliesare commonly evaluated using astm standard e 119 ref.
Fire endurance is a measure of elapsed time during which a material or assembly shows fire resistance under determined conditions of test and performance when applied to structural elements.
