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 list of approved materials includes: It is a multi-functional system in a single package: American Society for Testing and Materials, Customer Service Login Apply for account.
These hourly fire resistance ratings can be established by three different methods:. The mixes used our Marquette, Kansas plant aggregate and assumed 26.1 typical The fire resistance rating of concrete masonry is typically governed by the heat transmission criteria.
ACI 216.1-14 Code Requirements for Determining Fire Resistance of Concrete and Masonry
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:.
It also includes assemblies composed of concrete masonry wci other components including plaster and drywall finishes, and multi-wythe masonry components including clay or shale masonry units.
Fire testing of concrete masonry beams and lintels evaluates the ability of the member to sustain design loads under standard fire test conditions. The fire resistance rating of steel columns protected by concrete masonry as illustrated in Figure 4 is determined by the following equation:. The following proportions were used for blending Buildex and sand: NCMA Tek Table 2 Calculation of the fire resistance rating for the pcf normal weight units in Table 1 was axi using the appropriate values from Table 2 and Table 3, using linear interpolation between the hourly ratings for each material.
The strength, purity, thermal stability, and insulative qualities of Buildex aggregate make it an excellent performer in fire exposure, both in poured concrete and Acl masonry.
Fire Resistance Non-combustible Norlite masonry construction mitigates the spread of fires and the dangers of structural collapse. The fire-resistance ratings of the various thicknesses of concrete masonry walls are based on CBC Table The first is assuming fire on one side of the wall and the second is assuming the fire on the other side. The model building codes recognize that the fire resistance rating of a concrete masonry unit cmu is based on it’s equivalent thickness and type of aggregate, using linear interpolation if aggregates are blended in the cmu.
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 sci in.
For multi-wythe walls of clay brick and concrete masonry, use the values of Table 3 for the brick wythe in the above equation.
Expanded Shale, Clay or Slate. 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. It is a multi-functional system in a single package:. A commercial listing service which test materials and assemblies to determine if they comply with applicable safety standards.
For 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. 26.1 7 applies to finishes on the non-fire exposed 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
Expanded Shale, Clay or Slate 3. 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.
Certain finishes deteriorate more rapidly when exposed to fire than when on the non-fire side of the wall. The system also is somewhat inflexible in that little variation from the original tested wall assembly is allowed including unit size, afi, mix design, ingredients, and even the plant of manufacture.
When calculating the fire resistance rating of a wall with finishes, two calculations are performed. Click here for detailed fire resistence information.
To calculate the fire resistance rating of a concrete masonry unit, its equivalent thickness and the proportion of aggregate s used in its production must be known. Concrete masonry is a preferred material for use in constructing fire-resistive walls.
More importantly, the Standard 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 codes. The fire resistance rating is determined in accordance with Table 1 utilizing the appropriate aggregate type of the masonry unit and the equivalent thickness.
If the mixes were made with a lightweight aggregate of different density from another source, the aggregate proportions and the resulting fire resistance ratings will vary from those shown in Table 1. Drywall and furring may be attached in one of two ways:. Equivalent thicknesses are defined in CBC Section Extensive testing has established a relationship between the fire resistance and the equivalent solid thickness for concrete masonry walls as shown in Table 1.
The fire resistive properties of concrete masonry units are generally classified by hourly fire resistance ratings.
Fire Resistive Ratings
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.
The fire rating of the wall assembly is then the lowest of the two.
Built In Fire Safety 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. Finishes that are assumed to contribute to the total fire resistance rating of a wall must meet certain minimum installation requirements. 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.
FIRE RESISTANCE RATING OF CONCRETE MASONRY ASSEMBLIES
A premium is usually charged for units of this type. Can you afford to specify anything less? Lath nails spaced at 12 in. Figure 3 shows control joint details in fire rated wall assemblies in which openings are not permitted or where openings are required to be protected.