ACI 216.1 PDF
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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Gypsum wallboard and gypsum lath may be attached to wood or metal furring strips spaced a maximum of 24 in.
For example, an 8 inch hollow unit with cores filled would be considered as having a 7. 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. Concrete masonry is a preferred material for use in constructing fire-resistive walls. This is accomplished by insuring that the temperature rise of the tensile reinforcing does not exceed o F o C during the rating period.
It does not matter which side is exposed to the fire. Drywall and furring may be attached in one of two ways:. The fire resistance ratings for lightweight units were calculated by linear interpolation using two steps, as illustrated in Table 4 below. Fire Resistance Non-combustible Norlite masonry construction mitigates the spread of fires and the dangers of structural collapse.
The calculated fire resistance method is based on extensive research and results of previous testing of concrete masonry walls. The equivalent thickness of a hollow unit is equal to 216. percentage solid times the actual thickness of the unit.
Angelus Technical Article: Fire Resistive Ratings
Plaster and stucco need sci be applied in accordance with the provisions of the building code. Built In Fire Safety The mixes used our Marquette, Kansas plant aggregate and assumed a typical qci The list of approved materials includes: The fire-resistance rating of walls with cmu using blended aggregates 2166.1 determined per CBC Section The fire resistive properties of concrete masonry units are generally classified by hourly fire resistance 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 system also is somewhat inflexible in qci little variation from the original tested wall assembly is allowed including unit size, shape, mix design, ingredients, and even the plant of manufacture.
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. 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.
ACI – Code Requirements for Determining Fire Resistance | Construction Book Express
The fire resistance rating is determined in accordance with Table 1 utilizing the appropriate aggregate type of the masonry unit and the equivalent thickness.
Methods for Classification of Fire Resistant Ratings of Concrete Masonry The fire resistive properties of concrete masonry units are generally classified by hourly fire 2161.
ratings. 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. The fire rating of the wall assembly is then the lowest of the two. 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.
Home About Projects Contact Us. Note that there may be situations where the wall needs to rated with the fire on only one side. An alternative to the calculation method is provided by private 216. listing services. Fire testing Full scale assembly testing may be conducted and the results used to confirm code compliance or for the purpose of gathering new research data.
ACI 216.1-14 Code Requirements for Determining Fire Resistance of Concrete and Masonry
This adjustment makes the calculations conservative, afi they are expected to more closely match “real world” testing lab results, both for lightweight and heavy weight units.
Therefore, two separate tables are required. Cover requirements may be provided by masonry units, grout, or mortar. 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:. Fire testing of concrete masonry beams and lintels evaluates the ability of the member to sustain design loads under standard fire test conditions.
SmartWall Fire Resistance see Note 2. 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. For the lightweight units 93 and pcf density the net volumes in Table 3 were reduced approximately 2. 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.
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. The fire-resistance ratings of the various thicknesses of concrete masonry walls are based on CBC Table A commercial listing service which test materials and assemblies to determine if they comply with applicable safety standards.
SmartWall has a clear advantage in fire endurance, exceeding code minimums with an extra margin of safety.
Also publishers of directories that list classified assemblies. The fire resistance rating period 261.1 concrete masonry elements can be determined by three methods:. It is a multi-functional system in a single package: