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):||5 October 2018|
|PDF File Size:||13.76 Mb|
|ePub File Size:||5.91 Mb|
|Price:||Free* [*Free Regsitration Required]|
Non-combustible Norlite masonry construction mitigates the spread of fires and the dangers of structural collapse.
ACI 216.1-14 Code Requirements for Determining Fire Resistance of Concrete and Masonry
Ack equivalent thickness of a hollow unit is equal to the percentage solid times the actual thickness of the unit. Customer Service Login Apply for account. 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 walls with cmu using blended aggregates is determined per CBC Section Consult your representative for more information.
The fire-resistance ratings of the various thicknesses of concrete masonry walls are based on CBC Table The 216., purity, thermal stability, and insulative qualities of Buildex aggregate make it an excellent performer in fire exposure, acu in poured concrete and SmartWall masonry.
The calculation method is utilized in the Standard which determines fire resistance ratings based on the equivalent thickness of concrete masonry units and aggregate types used in their manufacture.
For example, an 8 inch hollow unit with acj filled aic be considered as having a 7. Home About Projects Contact Us. These hourly fire resistance ratings can be established by three different methods: For the lightweight units 93 and pcf density the net volumes in Table 3 were reduced approximately 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.
It does not matter which side is exposed to the fire.
American Society for Testing and Materials, Cover requirements may be provided by masonry units, grout, or mortar. 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 times listed in Table 8 are qci the length of time the various finishes will remain intact when exposed to fire on the fire side of the wall. These hourly fire resistance 21.61 can be established by three different methods:.
Fire Resistance :: Masonry :: Norlite Lightweight Aggregate
Extensive testing has established a relationship between the fire resistance and the equivalent solid thickness for concrete masonry walls as shown in Table 1. This adjustment makes the calculations conservative, and they are expected to avi closely match “real world” testing lab results, both for lightweight and heavy weight units.
Fire Resistance Non-combustible Norlite masonry construction mitigates the spread of fires and afi dangers of structural collapse. A premium is usually charged for units of this type. Nominal Width Equivalent Thickness, inches 8 inch 4.
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. SmartWall Fire Resistance see Note 2. 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.
Gypsum wallboard and gypsum lath may be attached to wood or metal furring strips spaced a maximum of 24 in. Fire resistance ratings greater than 4 hours are not listed in the 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 of reinforced concrete masonry columns is based on the least plan dimension of the column as indicated in Table 4. For multi-wythe walls of clay brick and concrete masonry, use the values of Table 3 for the brick wythe in the above equation. The listing service also monitors materials and production to verify that the concrete masonry units are and remain acl compliance with appropriate standards.
While finishes are normally applied for architectural reasons, they also provide additional fire resistance value. The fire resistance rating is determined in accordance with Table 1 utilizing the appropriate aggregate type of the masonry unit and the equivalent thickness.
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. 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.
The fire resistive properties of concrete masonry units are generally classified by hourly fire resistance ratings.
In many cases drywall, plaster or stucco finishes are added to concrete masonry walls. A variety of aggregate combinations is possible. 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. When calculating the fire resistance rating of a wall with finishes, two calculations are performed.
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. The fire resistance ratings for lightweight units were calculated by linear interpolation using two steps, as illustrated in Table 4 below.
The following proportions were used for blending Buildex and sand: 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.
Fire Resistive Ratings
Equivalent thicknesses are defined in CBC Section 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. The calculated equivalent thickness of a concrete masonry wall may include the thickness of cai plaster and lath, gypsum wallboard, or gypsum plaster.
By drawing on this data, methods of calculation have been developed to determine fire resistive ratings. The third option, testing of representative elements of the 216.1 in accordance with standard fire test methods is generally not practical due to aco expense of the test and time required to build, cure, and test representative specimens. Fire testing of concrete masonry columns evaluates the ability of the column to carry design loads under standard fire test conditions.