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
|Published (Last):||17 December 2017|
|PDF File Size:||10.40 Mb|
|ePub File Size:||18.70 Mb|
|Price:||Free* [*Free Regsitration Required]|
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. The document 216.11 code sections related to masonry and fire-resistance.
Concrete masonry units manufactured with Norlite aggregates are readily available throughout the Northeast.
These hourly fire resistance ratings can be established by three different methods:. 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. It is a multi-functional system in a single package: Built In Fire Safety It is based on extensive research which established a relationship between physical properties of materials and the fire resistance rating.
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. Customer Service Login Apply for account. Norlite, LLC S.
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. Also publishers of directories that list classified assemblies. The fire resistance rating is determined in accordance with Table 1 utilizing the appropriate aggregate type of the masonry unit and the equivalent thickness.
Angelus Technical Article: Fire Resistive Ratings
Fire resistance ratings greater than 4 hours are not listed in 21.1 building codes, so calculations of the rating for units with an equivalent thickness greater than that needed for a 4 hour rating was made by extrapolation, using the increase in equivalent thickness needed to raise the rating from 3 hours to 4 hours as the basis for the extrapolation.
The fire resistance rating is based on the equivalent thickness of the concrete masonry unit and the type of aggregate s used in its production. The first is assuming fire on one side of the wall and the second is assuming the fire on the other side. This adjustment makes the calculations conservative, and they are expected to more closely match “real world” testing lab results, both for lightweight and heavy weight units.
The fire resistance rating of steel columns protected by concrete masonry as illustrated in Figure 4 2166.1 determined by the following equation:. Certain finishes deteriorate more rapidly when exposed to fire than when on the non-fire side of the wall.
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. 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. 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 aaci the wall.
Plaster and stucco need only be applied in accordance with the provisions of the building code.
Fire Resistive Ratings
Expanded Shale, Clay or Slate 3. 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.
Non-combustible Norlite masonry construction acii the spread of fires and the dangers of structural collapse. A variety of aggregate combinations is possible.
Click here for detailed fire resistence information. Saratoga Street Cohoes, NY phone fax info norliteagg. For the lightweight units 93 and pcf density the net volumes in Table 3 were reduced approximately 2.
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. By drawing on this data, methods of calculation have been developed to determine fire resistive ratings.
Expanded Shale, Clay or Slate. Typical equivalent thickness values for these 216. are listed in Table 2.
Careers Industry Affiliations Request Info. The fire resistance rating of concrete masonry is typically governed by the heat transmission criteria. The calculation method is the most practical and most commonly used method of determining the fire 2161 rating of concrete masonry. The ratings are shown here in more detail to illustrate the difference in performance between different density units. 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 does not matter which side is exposed to the fire.
Site Map Take me to the homeowner’s site. When calculating the fire resistance rating of a wall with finishes, two calculations are performed.
It 2216.1 based on thousands of tests. Consult your representative for more information. Fire testing of concrete masonry columns evaluates the ability of the column to 261.1 design loads under standard fire test conditions. Units manufactured with a combination of aggregate types are addressed by footnote 2 which may be expressed by the following equation:. 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.
Fire testing of concrete masonry beams and lintels evaluates the ability of the member to sustain design loads under standard fire test conditions. The system also is somewhat inflexible in that little variation from the original tested wall assembly is allowed including unit size, shape, mix design, ingredients, and even the plant of manufacture.
The fire rating of the wall assembly is then the lowest cai the two.
These hourly fire resistance ratings can be established by three different methods: Concrete masonry is a preferred material for use in constructing fire-resistive walls. The calculated fire resistance method is based on extensive research and results of previous testing of concrete masonry walls.