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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This is then added to the base concrete masonry wall equivalent thickness which is used in Table 1 to determine the fire resistance rating. More importantly, the Cai is a document that has gone through a formal consensus process and is written in mandatory language, and therefore is now incorporated by reference into the national model aic.
The fire resistance ratings for lightweight units were calculated by linear interpolation using two steps, as illustrated in Table 4 below.
Fire Resistance :: Masonry :: Norlite Lightweight Aggregate
An alternative to the calculation method is provided by axi commercial listing services. For the most part, the contents of the Standard are not new, but rather are a compilation and refinement of the many documents previously published by the various segments of the masonry and concrete industry.
Click here for detailed fire resistence information. The fire resistance rating is determined in accordance with Table 1 utilizing the appropriate aggregate type of the masonry unit and the equivalent thickness.
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It should be noted that when finishes are used to achieve the required fire resistance rating, the masonry alone must provide at least one-half of the total required rating. 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 concrete masonry. Fire Resistance Non-combustible Norlite masonry construction mitigates the spread of fires and the dangers of structural collapse.
This is to assure structural integrity during a fire. Consult your representative for more information. It is based on extensive research which established a relationship between physical properties of materials and the fire resistance rating.
ACI 216.1-14 Code Requirements for Determining Fire Resistance of Concrete and Masonry
The document highlights code sections related to masonry and fire-resistance. Non-combustible Norlite 126.1 construction mitigates the spread of fires and the dangers of structural collapse. Equivalent thickness is essentially the solid thickness that would be obtained if the same amount of masonry contained in a hollow unit were recast without core holes.
Careers Industry Affiliations Request Info. By drawing on 261.1 data, methods of calculation have been developed to determine fire resistive ratings.
The 216. fire resistance procedure is practical, versatile, and economical. For example, an zci inch hollow unit with cores filled would be considered as having a 7. It is a multi-functional system in a single package: 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.
Gypsum wallboard must be installed with the long dimension parallel to the furring members and all horizontal and vertical joints must be supported and finished.
Fire Resistive Ratings
The calculated equivalent thickness of a concrete masonry wall may include the thickness of applied plaster and lath, gypsum wallboard, or gypsum plaster.
Note that there may be situations where the wall needs to rated with the fire on only one side. The listing service also monitors materials and production to verify that the concrete masonry units are and remain in compliance with appropriate standards. For the lightweight units 93 and pcf density the net volumes in Table 3 were reduced approximately 2. SmartWall Fire Resistance see Note 2.
Fire testing of concrete masonry columns evaluates the ability of the column to carry design loads under standard fire test conditions. Table 4 contains sample calculations for the 93 pcf unit; calculations for the pcf units use the same methods.
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:.
Self-tapping drywall screws spaced a maximum of 12 in. This TEK covers methods for determining the fire resistance rating of concrete masonry assemblies, including walls, columns, lintels, beams, and concrete masonry fire protection for steel columns.
The times listed in Aic 8 are essentially the length of time the various finishes will remain intact when exposed to fire on the fire side of the wall.
It does not matter which side is exposed to the fire. Table 7 applies to finishes on the non-fire acii side of the wall and Table 8 applies to finishes on the fire exposed side.
ACI Code Requirements for Determining Fire Resistance of Concrete and Masonry
The fire resistance rating of reinforced concrete masonry columns is based on the least plan dimension of the column as indicated in Table 4. Drywall and furring may 126.1 attached in one of two ways:.
These hourly fire resistance ratings can be established by three different methods: Sci finishes on the fire exposed side of the wall, a time is assigned to the finish in Table 8 which is added to the fire resistance rating determined for the base wall and non-fire side finish. The third option, testing of representative elements of the construction in accordance with 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.
Norlite, LLC S. The equivalent thickness of a hollow unit is equal to the percentage solid times the actual thickness of the unit.