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<br /> SECTION 4303 • UNIFORM BUILDING CODE 1970 EDITION `
<br /> • Protection of (b) Protective Coverings. 1. Thickness of protection. The 2, Reinforein SECTIONS 4303.4305
<br /> Structural Members thickness of fire-resistive materials required for protection of 'x4 meso a Thicloaess of protection for concrete or Protection of
<br /> (Continued) structural members shall be not less than set forth in Table my reinforcement shall be measured to the outside of the Structural Members
<br /> No.43-A,except as modified in this Section.The figures shown reinforcement except that stun-u s and spiral reinforcement (Continued)
<br /> Pla
<br /> shall be the net thickness of the protecting materials and shall Protemetiori project not more than one-half in. ( ") into the
<br /> not include any hollow space back of the protection. r
<br /> 2. Unit masonry protection. Where required, metal ties g' Bonded Prestressed concrete tendons.For members hav-
<br /> in a sin le tendon or more than one tendon installedi
<br /> shall be embedded in transverse joints of unit masonry for °, equal concrete cover measured from the nearest surface, the
<br /> protection of steel columns. Such ties shall be as set forth in
<br /> Table No. or be equivalent thereto. , � cover shallbee not less than that set forth in Table No.v43-A,
<br /> For members having veragee tendons installed with not less
<br /> 3. Reinforcement for cast-in-place concrete column'pro-
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<br /> ro- ;,,:,4:,.; ble concrete cover, the average tendon cover shall be less
<br /> Lection. Cast-in-place concrete protection for steel columns . x than that set forth in Table No. 43-A
<br /> shall be reinforced at the edges of such members with wire x provided: .
<br /> A. The clearance from each tendon e the nearest exposed
<br /> • ties of not less than.18 inch in diameter wound spirally around • surface is used to determine the average cover.
<br /> the columns on a pitch of not more than eight inc •
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<br /> hes ( ) '' BInonase can the clear cover for individual tendons i-4. Embedment of pipes. Conduits and pipes shall not be less than e clew If o£that set forth in TableNo, 43-A,A mini_embedded in required fire protection of structural members mum cover of $/ inch for slabsandIinch £oxbeams5. Column jacketing. Where the fire-resistivecovering on' ;qed for any aggregate concrete, Isre-
<br /> columns is exposed.to injury from moving vehiclesthe)<an , _ C. For the purpose ofestablishin ag g g fixe-resistive rating,• dlin of merchandise or other means it shall be rotected m tendons Navin a clear covering lessthan thatset £orfihinan approved manner, • x Table No. 43-dA shaIl not contribute more than 50 per centof':•#he3 required ultimate moment ca act for members Iess •
<br /> 6. Ceiling protection.Where a ceiling forms the protective than 350 square inches in cross-sectional axes
<br /> 111
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<br /> membrane for fire-resistive assemblies, the constructions and ''..lar ex members, For structural design
<br /> g and 65 per cent. 0
<br /> their supporting horizontal structural members need notb tendoins having a reduced cover are assumed to be full
<br /> individually fire protected except where such members supo �- Purposes, however,
<br /> calve. ,:
<br /> - directly applied loads from more than one floor or roof 10he be 1::
<br /> require fire resistance shall be not Iess than that xe'u�red o (`d`)`Fire Protection Omitted. Fire protection may f
<br /> individual protection of members. M. Witted from the bottom flange of lintels, spanning not overAt
<br /> 3
<br /> Ceilings shall form continuous fire-resistive membranes, • sLq iframee angles, or plates thatgare not a part of the struc-
<br /> may have openings for.copper, sheet steel, or ferrous o o i
<br /> ing pipes, ducts and electrical outlet boxes provided the ar a .@
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<br /> of such openings throw h the ceiling a re ate not more o,a 4304, (a) o.a
<br /> g g- gg g General. Fire-resistive walls and „i''
<br /> one hundred square inches (100 sq.m.) for any one;fiundre 4..4304.
<br /> to have the fu•e-resistance ratingsset forth Walls Partitions • "h'I�:
<br /> square feet (100 sq, ft.) of ceiling area. i;able No.. 43-B, s rRI.
<br /> Combustible Membe �' '•
<br /> Individual electrical outlet boxes shall be of steel ono s_,,, Combustible members framed !1
<br /> greater than sixteen square inches (16 sq, in) mute o'0,- eqm e�pfire-resistive thrclole rotected at th • as f such walj. an • �”
<br /> duct openings in such ceilings shall be protected byrnpp o, �� • q d y �y �
<br /> Exterior Walls. In fire-resistive exterior wall construe 1i
<br /> fire dampers. fireresistive rating shall be maintained for such walls .
<br /> EXCEPTION: Larger openings than permitted a ate. throw • attic " '
<br /> may be installed where such openings and the:: se 1Yareas. q{iiP
<br /> in which they are utilived are in accordance with til'" f
<br /> of tests pursuant to the provisions.of Section 43 e ; 4= ,,, 305 (a) General. Fire-resistive floor;ceilin r
<br /> � : or
<br /> %3. N • cons, etton systems shall be assumed to have thefir Roof-ceilingss or li `
<br /> (c) 1Protected,Members. 1. Attached metal mem b al `t., %.0-ors.atings set forth in Table No.43-C,
<br /> edges of lugs, brackets, rivets, and bolt heads attach, I o ;Fire-resistive$Dors shall be continuous and all �: �lstructural members may extend to within one•inoh ( ) r1'foreecharucaland electrical equipment shall be y,�,; o"� surface of the fire rotection, � ;_:; �� a �
<br /> P' s •specified in Section 1706,
<br /> 494 �
<br /> r 495 �� I;.
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