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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Units manufactured with a combination of aggregate types are addressed by footnote 2 which may be expressed by the following equation:. The calculation method is utilized in the Standard which determines fire resistance ratings based on the equivalent thickness of concrete masonry units and aggregate types used in their manufacture.
The calculation method is the most practical and most commonly used method of determining the fire resistance rating of concrete masonry. Equivalent thicknesses are defined in CBC Section It is incorporated by reference into the major model codes of the US and allows the designer virtually unlimited flexibility to incorporate the excellent fire resistive properties of aaci masonry into the design.
Angelus Technical Article: Fire Resistive Ratings
A variety of aggregate combinations is possible. Fire Resistance Non-combustible Norlite masonry construction mitigates the spread of fires and the dangers of structural collapse.
Self-tapping drywall screws spaced a maximum of 12 in. An alternative to the calculation method is provided by private commercial listing services.
ACI Code Requirements for Determining Fire Resistance of Concrete and Masonry
Therefore, two separate tables are required. The listing service 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.
Gypsum wallboard must be installed with the long dimension parallel to the acii members and all horizontal and vertical joints must be 216.11 and finished. Methods for Classification of Fire Resistant Ratings of Concrete Masonry The fire resistive properties of concrete masonry units are generally classified by hourly fire resistance ratings.
The fire resistance rating of multi-wythe walls Figure 2 is based on the fire resistance of each wythe and the air space between each wythe in accordance with the following Equation. 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, detail, or product offered herein.
Can you afford to specify anything less? By drawing on this data, methods of calculation have been developed to determine fire resistive ratings. Minimum required equivalent thickness corresponding to the fire resistance rating for units made with a combination of aggregates shall be determined by linear interpolation based on the percent by volume of each aggregate used in the manufacture.
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: SmartWall Fire Resistance see Note 2.
The strength, purity, thermal stability, and insulative qualities of Buildex aggregate make it an excellent performer in fire exposure, both in poured concrete and SmartWall masonry. The fire resistance rating period of concrete masonry elements can be determined by acj methods:. Nominal Width Equivalent Thickness, inches 8 inch 4. Drywall and furring may be attached in one of two ways:.
Typical equivalent thickness values for these units are listed in Table 2. Also publishers of directories that list classified assemblies.
Note that there may be situations where the wall needs to rated with the fire on only one side.
ACI 216.1-14 Code Requirements for Determining Fire Resistance of Concrete and Masonry
While finishes are normally applied for architectural reasons, they also provide additional fire resistance value. Expanded Shale, Clay or Slate 3. The fire resistance rating of concrete masonry is typically governed by the heat transmission criteria.
SmartWall has a clear advantage in fire endurance, exceeding code minimums with an extra margin of safety. 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. Non-combustible Norlite masonry construction mitigates the spread of fires and the dangers of structural collapse.
The minimum required cover over the vertical reinforcement is 2 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.
Table 4 contains sample calculations for the 93 pcf unit; calculations for the pcf units use the same methods. Gypsum wallboard aaci gypsum lath may be attached to wood or metal furring strips spaced a maximum of 24 in. Cover requirements may be provided by masonry 216., grout, or mortar. Built In Fire Safety This is ack added to the base concrete masonry wall equivalent thickness which is used in Table 1 to determine the fire resistance rating. 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.