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-411.4
<br /> 311,8,5 - 1997 UNIFORM BUILDING CODE
<br /> 3113;Location on Property.For:fire-resistive ipmtection,of to street level and in that public occupancy is piblil'ted abd e-the
<br /> exterior walls and openings,=as'aetermined by-location on plop- street level.
<br /> erty,see Section 503.
<br /> OPEN PARIONNG GARAGE is a structure of I or II ( )
<br /> 311A Access and Means of Fadlihes. Means of egress construction with the openings as described m Sethi n 1.9a2 ,.J✓
<br /> shall be provided as specifie`c�gin nits ter 10'' on two of more sides and that is'used dxc'"dnsiitel or e, `or
<br /> R, '` p'' storage-of private or pleasure- amotor�r.
<br /> Access to;and egress from,buildings required.to be accessible P assure" elticles.� .r
<br /> shall be provided as specified in Chapter 11. E%CFMON:'The grade-kvei tier
<br /> waiting and toilet rooms Laving a total area
<br /> 3115 IjLght;Ventilatlon`an8 Sauttalioh:=lny��G� - square feQQep�t��(p9�3 m'2) Snch'area needbese a .
<br /> a ,tltgut,s ventilator-and Y♦ + _L ' 1.[ 4 ,4 •.�"",4".�, 'Z�`ff.7�:
<br /> Chap�ers"12 and 29,'ex*9li6tea bekow'rt` the` MP-ACCESS O
<br /> 1.5.1 Repair and storage �°g �employing a series of continuonsky ristagfloors
<br /> f;��ge8, aircraft bangers. See or a series of interconnecting.ramps between floors�ermttting the
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<br /> Section 1202.2.6 for ventilation requirements for Group S,Divi- movement of vehicles under thea own power from'and the
<br /> sion 3 repair garages,storage garages.and Group S,Division 5 air- street level.
<br /> craft hangars. z1ac.
<br /> 311.5y Parking garages ;: 3119.2.2 Openings. For natural ventilation purposesythe exte- Q
<br /> . See Section 1202.2.7,for ventilation rior side of the structure shall have umfornilyishi`bu requirements for for parking garages, uW on two or`more sides.The sees of such openings in exterior
<br /> walls on a tiei must be at least 20 percent of the total perimeter
<br /> 311.6 Shaft and Exit Enclosures. Exits shall be enclosed as wall area of each tier. a aggregate lehigth'of the openings con-
<br /> specified in Chapter 10. sidered to be providing natural ventilation shall eonstitttte i mini-
<br /> Elevator shafts,vent shafts and other openings through floors mum of 40 percent of the perimeter of the tier.Interior wall lines
<br /> shall be enclosed,and the enclosure shall.be as specified in Sec- and column lines shall be at least 20 percent open with uniformly
<br /> tion 711. K :,: ; : distributed opgmngs. , t _ ,' st
<br /> „ .
<br /> :ERCEPTION:In Group S,Division 2 occupancies,exits shall be 31193�:o,rnstractioa. Constructor shall be`s of oneom'hus
<br /> enclosed as specified in Chapter,10,but other through-floor openings tible'materials.""Open ....r.r ' s '
<br /> need not be enclosed Pte ' shall meete design.
<br /> requirements of Chapter 16:For vehicle barriers; see'Set.ction
<br /> In buildings housing Group S Occupancies equipped with auto- 311.2.3.5.
<br /> matic sprinkler systems throughout,enclosures.need not be pro-
<br /> P 3119.4 Area and height. Area and height ofopen parking
<br /> vided for escalators where the top of the escalator opening at each gages shall be limited as set forth in Table 3-H,.except for
<br /> story is provided with a draft curtain and automatic fire sprinklers increases'allowed by Section 31195. '
<br /> are installed around the perimeter of the opening within 2 feet :, _
<br /> (610 mm)of the draft curtain.The draft curtain shall enclose the In structures having a spiral or sloping floor;the horizontal pro-
<br /> perimeter.of the unenclosed opening and extend from the ceiling ectioan o arestructure
<br /> tructureeaat n cross section shall not,exceed the
<br /> downward at least 12 inches(30$mm)on all sides.The spacing per parking tier.In the case:of a sftictue'liavirig a
<br /> between sprinklers shall not exceed 6-feet(1829:mm). continuous spiral floor,each 9 feet 6 inches(2896 mm)of height;
<br /> or portion thereof,shall be considered.a'ter z'C,A""='
<br /> 311.7 Sprinkler and Standpipe Systems Vhen.i+egtured bY. The clear height of a
<br /> Section 904:2 or other provisions of this code,automatic sprinkler parking tier shall not be less than 7 feet
<br /> sP�� (2134 mm),except that a lower clear height may be ptmitted in
<br /> systems''and'standpipes shall lie'installed as ed in-Cha
<br /> ter 9. specifi P- mechanical-access open parking garages when approved by the
<br /> building official.
<br /> 311.8 Special Hazards.,Storage and use-of flammable and 31195 Area and_height Inerrases.. Ile area and height of
<br /> combustible liquids shall be in accordance with the Fire Code. structures with cross ventilation throughout may be�incxeased in
<br /> Devices generating a glow;spank or flame capable of igniting accordance with provisions of this section.Structnes with"sides
<br /> open on three'fourths'of the buil
<br /> flammable vapors shall be installed such that sources of ignition perimete'may.b6'#nlcrcased
<br /> b 25 percent in area and one ie in h . "-t
<br /> are at least 18 inches{457 mm)above the floor of any room in y � eight.$tructures yPith sides
<br /> which Cass I flammable liquids or flammable gases are used or open around the entire building perimeter may be increased 50
<br /> stored. percent in area and one tier in height.For a side to be considered
<br /> open under the above provisions,the total area of opemngss along
<br /> Buildings erected or converted to:house high-piled oombus- the side shall not be less than 50 percent of the interior area of the
<br /> tible stock or aerosols shall Comply.with the Fire Code. side at each tier,and such openings_shall be,equally,distributed
<br /> 3119 Group S,Division 4 Open Parking Garages, along the length of the tier. j
<br /> 3119.1 Soo Except where �n l��garages constructed to heights less than the max-
<br /> 311.9.1specific provisions are made in imums established by Table 3-H may have individual tier meas �.
<br /> ments of this code shall exceeding those otherwise permitted,provided the gross
<br /> the following sections, other require tier area
<br /> apply' of the structure does not exceed that permitted for the e i.am
<br /> 3119.2 Definitions. structure.At least three sides of each such IarW tier shall have
<br /> continuous horizontal openings not less than 30 inches,(762 mm)
<br /> 3119.2.1 General. For the purpose of this section,certain terms in clear height extending for at least 80 percent of the length of the
<br /> are defined as follows: sides,and no part of such larger tier shall be more than Vo feet j l
<br /> (60 960 mm)horizontally from such'an coing k add"each
<br /> MECHANICAL-ACCESS OPEN PARSING GARAGES such opening shall face a street or yard accessible to a street with a
<br /> are open parking garages employing parking machines,lifts,ele- width of at least 30 feet(9144 mm)for the full length of the open-
<br /> vators or other mechanical devices for vehicles moving from and ing,and standpipes shall be provided in each,such
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