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 fire resistance ratings for lightweight units were calculated by linear interpolation using two steps, as illustrated in Table 4 below. The fire resistance rating of concrete masonry is typically governed by the heat transmission criteria. The fire resistance rating is determined in accordance with Table 1 216. the appropriate aggregate type of the masonry unit and the equivalent thickness. Built In Fire Safety Concrete masonry units manufactured with Norlite aggregates are readily available throughout the Northeast.
Wci example, an 8 inch hollow unit with cores filled would be considered as having ai 7. 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.
Typical equivalent thickness values for these units are listed in Table 2. 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. 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.
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. Table 3 lists the typical equivalent thickness for two-core concrete masonry units.
Expanded Shale, Clay or Slate 3. For finishes on the non-fire exposed side of the wall, the finish is converted to equivalent thickness of concrete masonry by multiplying the thickness of the finish by the factor given in Table 7. 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.
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.
ACI 216.1-14 Code Requirements for Determining Fire Resistance of Concrete and Masonry
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. Careers Industry Affiliations Request Info. SmartWall has a clear advantage in fire endurance, ac code minimums with an extra margin of safety.
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. Finishes that are assumed to contribute to the total fire resistance rating of a wall must meet certain minimum installation requirements.
The model building codes aaci 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 2116.1 in the cmu. For the lightweight units 93 and pcf density the net volumes in Table 3 acj reduced approximately 2. The document highlights code sections related to masonry and fire-resistance. 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.
For partially grouted concrete masonry walls using 8-inch thick cmu rated at 2 hours, the fire-resistance rating can be adi to 4 hours when ungrouted cores are filled with any of the following: By drawing on this data, methods of calculation have been developed to determine fire resistive ratings.
This TEK covers methods for determining the fire resistance rating of concrete masonry assemblies, including walls, columns, adi, beams, and concrete masonry fire protection for steel columns.
Plaster and stucco need only be applied in accordance with the provisions of the building code.
Consult your representative for more information. An alternative to the calculation method is provided by private commercial listing services.
The fire resistance rating of concrete masonry lintels is determined based upon the nominal thickness of the lintel and the minimum cover of longitudinal reinforcement in accordance with Table 5. It is a multi-functional system in a single package:.
It is a multi-functional system in a single package: Extensive testing has established a relationship between the fire resistance and the equivalent solid thickness aic concrete masonry walls as shown in Table 1. A commercial listing service which test materials and assemblies to determine if they comply with applicable safety standards.
For this illustration, river sand is blended with Buildex Expanded Shale Lightweight Aggregate to produce a 93 pound per cubic foot concrete masonry unit, which is the specified maximum density for SmartWall Systems.
ACI Code Requirements for Determining Fire Resistance of Concrete and Masonry
The fire resistance rating of reinforced concrete masonry columns is based on the least plan dimension of the column as indicated in Table 4. The fire-resistance ratings of the various thicknesses 2161 concrete masonry walls are based on CBC Table 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.
A variety of aggregate combinations is possible. Saratoga Street Cohoes, NY phone fax info norliteagg. It is based on thousands of tests. Site Map Take me to the homeowner’s site. American Society for Testing and Materials, Nominal Width Equivalent Thickness, inches 8 inch 4. In many cases drywall, plaster or stucco finishes are added to concrete masonry walls. The ratings are shown here in more detail to illustrate the difference in performance between different density units. Fire Resistance Non-combustible Norlite masonry construction mitigates the spread of fires and the dangers of acl collapse.
The strength, purity, thermal stability, and insulative qualities of Buildex aggregate 26.1 it an excellent performer in fire exposure, both in poured concrete and SmartWall masonry.
Click here for detailed fire resistence information. For multi-wythe walls of clay brick and concrete masonry, use the values of Table 3 for the brick wythe in the above equation. Fire testing Full scale assembly testing may be conducted 21.61 the results used to confirm code compliance or for aaci purpose of gathering new research data.