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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It also includes assemblies composed of concrete masonry and other components including plaster and drywall finishes, and multi-wythe masonry components including clay or shale masonry units.
ACI Code Requirements for Determining Fire Resistance of Concrete and Masonry
This is then added to the base concrete masonry wall equivalent thickness which is used in Table 1 to determine the fire resistance rating.
Table 3 lists the typical equivalent thickness for two-core concrete masonry units. Concrete masonry is a preferred material for use in constructing fire-resistive walls.
Extensive testing has established a relationship between the fire resistance and the equivalent solid thickness for concrete masonry walls as shown in Table 1. Site Map Take me to the homeowner’s site. This is accomplished by insuring that the temperature rise of the tensile reinforcing does not exceed o F o C during the rating period. Gypsum wallboard and gypsum lath may be attached to wood or metal furring strips spaced a maximum of 24 in.
Click here for detailed fire resistence information. Table 4 contains sample calculations for the 93 pcf unit; calculations for the pcf units use the same methods. 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.
These hourly fire resistance ratings can be established by three different methods:. 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.
Fire Resistive Ratings
SmartWall has a clear advantage in fire endurance, exceeding code minimums with an extra margin of safety. Cover requirements may be provided by masonry units, grout, or mortar.
A premium is usually charged for units of this type.
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:. Careers Industry Affiliations Request Info. Self-tapping drywall screws spaced a maximum of 12 in. Units manufactured with a combination of aggregate types are addressed by footnote 2 which may be expressed by the following equation:.
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. 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. For partially grouted concrete masonry walls using 8-inch thick cmu 216.11 at 2 26.1, the fire-resistance rating can be increased to 4 hours when ungrouted cores are filled with any of the following: 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.
ACI 216.1-14 Code Requirements for Determining Fire Resistance of Concrete and Masonry
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. The fire resistance rating is determined in accordance with Table 1 utilizing the appropriate aggregate type of the masonry unit and the equivalent thickness. The fire-resistance ratings of the various thicknesses of concrete masonry walls are based on CBC Table 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.
Fire testing of concrete masonry columns evaluates the ability of the column to carry design loads under standard fire test conditions. For example, an 8 inch hollow unit with cores filled would be considered as having a 7.
ACI – Code Requirements for Determining Fire Resistance | Construction Book Express
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 walls where the unfilled cells are left empty, the equivalent thickness for fire resistance rating purposes is equal to that of an ungrouted unit. 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. In many cases drywall, plaster or stucco finishes are added to concrete masonry walls.
A variety of aggregate combinations is possible.
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. While finishes are normally applied for architectural reasons, they also provide additional fire resistance value. By drawing on this data, methods of calculation have been developed to determine fire resistive ratings.
The fire resistance rating of concrete masonry is typically governed by the heat transmission criteria.
Consult your representative for more information. Methods for Classification of Fire Resistant Ratings of Concrete Masonry The fire resistive properties of concrete masonry units are generally classified by hourly fire 2216.1 ratings.
Expanded Shale, Clay or Slate 3. The document highlights code sections related to masonry and fire-resistance. Fire testing of concrete masonry beams and lintels evaluates the ability of the member to sustain design loads under standard fire test conditions.
It is incorporated by reference into the major model codes 2116.1 the US and allows the designer virtually unlimited flexibility to incorporate the excellent fire resistive properties of concrete masonry into the design.
Fire testing Full scale assembly testing may be conducted and the results used to confirm code compliance or for the purpose of gathering new 2166.1 data. 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. 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.
These hourly fire resistance ratings can be established by three different methods: The calculated equivalent thickness of a concrete masonry wall may include the thickness of applied plaster and lath, gypsum wallboard, or gypsum plaster.