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// CODE SNIPPET

722.2.3.3 Prestressed Beam Cover

2015 Virginia Construction Code (USBC, Part I) > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.2 Concrete Assemblies > 722.2.3 Concrete Cover Over Reinforcement > 722.2.3.3 Prestressed Beam Cover
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The minimum thickness of concrete cover to the positive moment prestressing tendons (bottom steel) for restrained and unrestrained prestressed concrete beams and stemmed units shall comply with the values shown in Tables 722.2.3(4) and 722.2.3(5) for fire-resistance ratings of 1 hour to 4 hours. Values in Table 722.2.3(4) apply to beams 8 inches (203 mm) or greater in width. Values in Table 722.2.3(5) apply to beams or stems of any width, provided the cross-section area is not less than 40 square inches (25 806 mm2). In case of differences between the values determined from Table 722.2.3(4) or 722.2.3(5), it is permitted to use the smaller value. The concrete cover shall be calculated in accordance with Section 722.2.3.3.1. The minimum concrete cover for nonprestressed reinforcement in prestressed concrete beams shall comply with Section 722.2.3.2.

722.2.3.3.1 Calculating Concrete Cover

The concrete cover for an individual tendon is the minimum thickness of concrete between the surface of the tendon and the fire-exposed surface of the beam, except that for ungrouted ducts, the assumed cover thickness is the minimum thickness of concrete between the surface of the duct and the fire-exposed surface of the beam. For beams in which two or more tendons are used, the cover is assumed to be the average of the minimum cover of the individual tendons. For corner tendons (tendons equal distance from the bottom and side), the minimum cover used in the calculation shall be one-half the actual value. For stemmed members with two or more prestressing tendons located along the vertical centerline of the stem, the average cover shall be the distance from the bottom of the member to the centroid of the tendons. The actual cover for any individual tendon shall be not less than one-half the smaller value shown in Tables 722.2.3(4) and 722.2.3(5), or 1 inch (25 mm), whichever is greater.

Related Code Sections


722.2.3.3 Fire and Smoke Protection Features, Prestressed Beam Cover
concrete cover for nonprestressed reinforcement in prestressed concrete beams shall comply with Section 722.2.3.2 ...
2015 Virginia Construction Code (USBC, Part I) > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.2 Concrete Assemblies > 722.2.3 Concrete Cover Over Reinforcement > 722.2.3.3 Prestressed Beam Cover
722.2.3.3 Fire and Smoke Protection Features, Prestressed Beam Cover
concrete cover for nonprestressed reinforcement in prestressed concrete beams shall comply with Section 722.2.3.2 ...
2012 Virginia Construction Code (USBC, Part I) > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.2 Concrete Assemblies > 722.2.3 Concrete Cover Over Reinforcement > 722.2.3.3 Prestressed Beam Cover
722.2 Fire and Smoke Protection Features, Concrete Assemblies
thickness of concrete cover over reinforcement in concrete slabs, reinforced beams and prestressed beams shall comply with this section. TABLE ...
2015 Virginia Construction Code (USBC, Part I) > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.2 Concrete Assemblies
721.1.5 Fire and Smoke Protection Features, Bonded Prestressed Concrete Tendons
cover of 3 / 4 inch (19.1 mm) for slabs and 1 inch (25 mm) for beams is required for any aggregate concrete. For the purpose of establishing ...
2015 Virginia Construction Code (USBC, Part I) > 7 Fire and Smoke Protection Features > 721 Prescriptive Fire-Resistance > 721.1 General > 721.1.5 Bonded Prestressed Concrete Tendons
721.1.5 Fire and Smoke Protection Features, Bonded Prestressed Concrete Tendons
For members having a single tendon or more than one tendon installed with equal concrete cover measured from the nearest surface, the cover shall ...
2012 Virginia Construction Code (USBC, Part I) > 7 Fire and Smoke Protection Features > 721 Prescriptive Fire Resistance > 721.1 General > 721.1.5 Bonded Prestressed Concrete Tendons
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