ACI Code Requirements for Determining Fire Resistance of Concrete and Masonry Construction Assemblies. for Determining. Fire Resistance of. Concrete and Masonry. Construction Assemblies. Reported by ACI/TMS Committee A. CI/TMS M An ACI /TMS. Find the most up-to-date version of ACI at Engineering
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The first is assuming fire on one side aco the wall acj the second is assuming the fire on the other side. Gypsum wallboard and gypsum lath may be attached to wood or metal furring strips spaced a maximum of 24 ai. Click here for detailed fire resistence information. The fire-resistance rating of walls with cmu using blended aggregates is determined per CBC Section Fire testing Full scale assembly testing may be conducted and the results used to confirm code compliance or for the purpose of gathering new research data.
For finishes on the non-fire exposed side of the wall, the finish is converted to equivalent thickness of concrete masonry by multiplying the thickness of the finish by the factor given in Table 7. The times listed in Table 8 are essentially the length of time the various finishes will remain intact when exposed to fire on the fire side of the wall. SmartWall has a clear advantage in fire endurance, exceeding code minimums with an extra margin of safety.
It is the responsibility of the user to obtain engineering or other advisory services from licensed professionals as the basis for incorporating into any project any information, 261.1, or product offered herein. The list of approved materials includes: Cover requirements may be provided by masonry units, grout, or mortar.
Angelus Technical Article: Fire Resistive Ratings
This is accomplished by insuring that the temperature rise of the tensile reinforcing does not exceed o F o C during the rating period. By drawing on this data, methods of calculation have been developed to determine fire resistive ratings. The calculated fire ai procedure is practical, versatile, and economical.
Concrete masonry is widely specified for fire walls and fire separation walls because these elements are:.
The fire resistance ratings for lightweight units were calculated by linear interpolation using two steps, as illustrated in Acl 4 below. The fire resistive properties of concrete masonry units are generally classified by hourly fire resistance ratings.
A premium is usually charged for units of this type. A variety of aggregate combinations is possible. This is then added to the base concrete masonry wall equivalent thickness which is used in Table 1 to determine the fire resistance rating.
This is to assure structural integrity during a fire. Equivalent thickness is essentially the solid thickness that would be obtained if the same amount of masonry contained in a hollow unit adi recast without core holes.
ACI – Code Requirements for Determining Fire Resistance | Construction Book Express
In many cases drywall, plaster or stucco finishes are added to concrete masonry walls. For partially grouted concrete masonry walls using 8-inch thick cmu rated at 2 hours, the fire-resistance rating can be increased to 4 hours when ungrouted cores are filled with any of the following: The third option, testing of representative elements of the construction in accordance ai standard fire test methods is generally not practical due to the expense of the test and time required to build, cure, and test representative specimens.
Home About Projects Contact Us. This type of failure mode is certainly preferable to a structural collapse endpoint characteristic of acj other building materials from the standpoint of life safety particularly for fire fighters and salvageability. Noncombustible, stable in response to fire Structurally sound, exceptional seismic performance No toxic gases released when heated Durable, long-lasting, with low life-cycle costs.
ACI 216.1-14 Code Requirements for Determining Fire Resistance of Concrete and Masonry
This adjustment recognizes the fact that the ASTM C test method for net volume of concrete masonry units typically results in slightly lower values for lightweight 261.1 masonry. Customer Service Login Apply for account. The minimum required cover over the vertical reinforcement is 2 in.
NCMA Tek Table 2 Calculation of the fire resistance rating for the pcf normal weight units in Table 1 was performed using the appropriate values from Table 2 and Table 3, using linear interpolation between the hourly ratings for each material.
The listing cai approach allows the designer to select a fire rated assembly which has been previously classified and listed in a published directory of listed fire rated assemblies. Plaster and stucco need only be applied in accordance acii the provisions of the building code. While finishes are normally applied for architectural reasons, they also provide additional fire resistance value.
Self-tapping drywall screws spaced a maximum of 12 in. If the cells of hollow unit masonry are filled with approved materials, the equivalent thickness of the assembly can be considered the same as the actual thickness.
The listing service also monitors materials and production to verify that the concrete masonry axi are and remain in compliance with appropriate standards.
Fire Resistive Ratings
The calculation method is the most practical and most commonly used method of determining the fire resistance rating of concrete masonry. Finishes that are assumed to contribute to the total fire resistance rating of a wall must meet certain minimum installation requirements.
Equivalent thicknesses are defined in CBC Section Typical equivalent thickness values for these units are listed in Table 2.
Table 4 contains sample calculations for the 93 pcf unit; calculations for the pcf units use the same methods. Fire testing of concrete masonry columns evaluates the ability of the column to carry design loads under standard fire test conditions. Fire testing of a concrete masonry protected steel column assembly evaluates acu structural integrity of the steel column under fire test conditions by measuring the temperature rise of the steel.
A commercial listing service which test materials and assemblies to determine if they comply with applicable safety standards. For the lightweight units 93 and pcf density the net volumes in Table 3 were reduced approximately 2.
The calculated equivalent thickness of a concrete masonry wall may include the thickness of applied plaster and lath, gypsum wallboard, or gypsum plaster. Consult your representative for more information. The ratings are shown here in more detail to illustrate the difference in performance between different density units. Concrete masonry is a preferred material for use in constructing fire-resistive walls.