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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This TEK covers methods for determining the fire resistance rating of concrete masonry assemblies, including walls, columns, lintels, beams, and concrete masonry fire protection for steel columns. It is incorporated by reference 216.1 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 rating of steel columns protected by concrete masonry as illustrated in Figure 4 is determined by the following equation:. 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. The fire-resistance rating of walls with cmu using blended aggregates is determined per CBC Section NCMA Tek Table 2 Calculation of the fire resistance rating for the pcf normal weight units in Table 1 was performed using the appropriate values from Table 2 and Table 3, using linear interpolation between the hourly ratings for each material.
Fire Resistance Non-combustible Norlite masonry construction mitigates the spread of fires and the dangers of structural collapse. For this illustration, river sand is blended with Buildex Expanded Shale Lightweight Aggregate to 2216.1 a 93 pound per cubic foot concrete masonry unit, which is the specified maximum density for SmartWall Systems.
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 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 must be installed with the long dimension parallel to the furring members and all horizontal and vertical joints must be supported and finished. SmartWall has a clear advantage in fire endurance, exceeding code minimums with an extra margin of safety. The system also is somewhat inflexible in that little variation from the original tested wall assembly is allowed including unit size, shape, mix design, ingredients, and even the plant of manufacture.
Nominal Width Equivalent Thickness, inches 8 inch 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.
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. It is based on extensive research which established avi relationship between physical properties of materials and qci fire resistance rating.
Certain finishes deteriorate more rapidly when exposed to fire than when on the non-fire side of the wall. Gypsum wallboard and gypsum lath may be attached to wood or metal furring strips spaced a maximum of 24 in.
Self-tapping drywall screws spaced a maximum of 12 in. 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. 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. Customer Service Login Apply for account. Table 3 lists the typical equivalent thickness for two-core concrete masonry units.
Fire testing of concrete masonry columns evaluates the ability of the column to carry design loads under standard fire test conditions.
ACI – Code Requirements for Determining Fire Resistance | Construction Book Express
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. American Society qci Testing and Materials, Drywall and furring may be attached in one of two ways:.
The following proportions were used for blending Buildex and sand: Consult your representative for more information. Concrete masonry is widely specified for fire walls and fire separation walls because these elements are:.
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.
Non-combustible Norlite masonry construction mitigates the spread of fires and the dangers of structural collapse. Built In Fire Safety The first is assuming fire on one side of the wall and the second is assuming the fire on the other side.
Fire testing Full scale assembly testing may be conducted and the results used to confirm code compliance or for the purpose of 2116.1 new research data.
Concrete masonry is a preferred material for use in constructing fire-resistive walls.
Units manufactured with a combination of aggregate types are addressed by footnote 2 which may be expressed by the following equation:. Note that there may be situations where the wall needs to rated with the fire on only one side. The fire resistive properties of concrete masonry units are generally classified by hourly fire resistance ratings. The minimum required cover over the vertical reinforcement is 2 in. 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.
SmartWall Fire Resistance see Note 2. For example, an 8 inch hollow unit with cores filled would be considered as having a 7.
ACI 216.1-14 Code Requirements for Determining Fire Resistance of Concrete and Masonry
The fire resistance rating period of concrete masonry elements can be determined by three methods:. 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. Extensive testing has established a relationship between the fire resistance and the equivalent solid thickness for concrete masonry walls as shown in Table 1. These hourly fire resistance ratings can be established by three different methods:.
The fire resistance rating of reinforced concrete masonry columns is 216.1 on the least plan dimension of the column as indicated in Table 4. A variety of aggregate combinations is possible.
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. If the mixes were made with a lightweight aggregate of different density from another source, the aggregate 2161. and the resulting fire resistance ratings will vary from those shown in Table 1. The calculated fire resistance procedure is practical, versatile, and economical.