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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Self-tapping drywall screws spaced a maximum of 12 in. The following proportions were used for blending Buildex and sand: Nominal Width Equivalent Thickness, inches 8 inch 4. An alternative to the calculation method is provided by private commercial listing services.
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. 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.
Table 3 lists the typical equivalent thickness for two-core concrete masonry units. A premium is usually charged for units of this type. 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: When calculating the fire resistance rating of a wall with finishes, two calculations are performed. Concrete masonry is a preferred material for use in constructing fire-resistive walls.
The calculated equivalent thickness of a concrete masonry wall may include the thickness of applied plaster and lath, gypsum wallboard, or gypsum plaster. 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. American Society for Testing and Materials, The ratings are shown here in more detail to illustrate the difference in performance between different density units.
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. 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.
Typical equivalent thickness values for these units are listed in Table 2. 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:. 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 and gypsum lath may be attached to wood or metal furring strips spaced a maximum of 24 in. The fire rating of the wall assembly is then the lowest of the two. Cover requirements may be provided by masonry units, grout, or mortar.
The first is assuming fire on one side of the wall and the second is assuming the fire on the other side. For example, an 8 inch hollow unit with cores filled would be considered as having a 7. Home About Projects Contact Us. These hourly fire resistance ratings can be established by three different methods:. It should be noted that when finishes are used 26.1 achieve the required fire resistance rating, the masonry alone must provide at least one-half of the total required rating.
Fire testing of a concrete masonry protected steel column assembly evaluates the structural integrity of the steel column under fire test conditions by measuring the temperature rise of the steel. Saratoga Street Cohoes, NY phone fax info norliteagg.
Methods for Classification of Fire Resistant Ratings of Concrete Masonry The fire resistive properties of concrete masonry aco are generally classified by hourly fire resistance ratings.
The list of approved materials includes: Can you afford to specify anything less? This type of failure mode is certainly preferable to a structural collapse endpoint characteristic of many other building materials from the standpoint of life safety particularly for fire fighters and salvageability. This TEK covers methods for determining the adi resistance rating of concrete masonry assemblies, including walls, columns, lintels, beams, and concrete masonry fire protection for steel columns.
Fire Resistive Ratings
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 calculated fire resistance method is based on extensive research and results of previous testing of concrete masonry walls. Expanded Shale, Clay or Slate. Therefore, two separate tables are required. ac
ACI – Code Requirements for Determining Fire Resistance | Construction Book Express
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. By drawing on this data, methods of calculation have been developed to determine fire resistive ratings.
These hourly fire resistance ratings can be established by three different methods: Equivalent thicknesses are defined in CBC Section To calculate the fire resistance rating of a concrete masonry unit, 2161. equivalent thickness and the proportion of aggregate s used in its production must be known. The fire resistive properties of concrete masonry units are generally classified by qci fire resistance ratings. 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 concrete masonry into the design.
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 reinforced concrete masonry columns is based on the least plan dimension of the column as indicated in Table 4. 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.