冷弯型钢框架结构设计方法

1、傈缫恋攮牖瑰烈趿胎饱蒸PRESCRIPTIVE METHOD FOR RESIDENTIAL COLD-FORMED冀是坠环畔儒潍呢瘅虎疽STEEL FRAMING浇殍曛劣畲沲死辟簧嬗桔蓊舨振惜星烀韦抠潮茱荧Second Edition溆陧共鞘娅鲨觐砜矿鼎咒牍臼苋拂粽诙滨佬鄂卒禁Prepared for晨炝彗怯劂胸椁蝙黾镆苘懵熬构呶碹蚝焘免姬技赈The U.S. Department of Housing葸廴牌饯捕怀荚台汪撮洳and Urban Development 汝玟辽桐蘩闷嗳踢沦高许Office of Policy Development and Research崂砩柜鸠吹烷绎坎版峡驾

2、Washington, DC娅锛蓰缍罴邀剩鹎畏糙套词醋桂镯浅薜霜隍逸囿驮Co-Sponsored by 鞴稃呸绕碥扒彝廉伏陈掬The American Iron and Steel Institute赫敖僚夕机缏哧嘿夙泅鹫Washington, DC喂跋琰饺痛蹿毫论琳旺溘踝嘌宋缏远诔翱缲刮鹪酩and讹稃澜分走陌嘲丸戗厮滑渖续原愦宏谣受赦谰押类The National Association of Home Builders镶胀惝鳗道匀遽壤尕榀翁Washington, DC仅华镟藁钼悫舣冬碳埒涡咐搦载瘰惺幕宓具断臧膺by凋饱演圳望鲽鹱凉梅绮袢鲛汞镟咱糁钳级罕翱芮绾NAHB Research Ce

3、nter, Inc.稷征落媵斟蠊会撅湃皑弛400 Prince Georges Boulevard昀藤琵涩啄望豪祭攒羯裢Upper Marlboro, MD 20774-8731荤潺芨怊亟侧荠撖辅钶箨晨彷民赣凰绢废儋剖元蓼 August 1997饱掐袍莶唏糗鸦悱璁瓦奸CONTENTS紧簸咏袢岘飙埚快搔磴挤5.0STEEL FLOOR FRAMING21旄嘉幢德酊稃欧敌荒豳羟5.1Floor Construction21辕纷缴衢肼魏钩妯芝鳓侏5.2Floor to Foundation or Bearing Wall Connection21计韧窃儡亘郢勘簧玖圄嶝5.3Allowable Joi

4、st Spans21珊坝龟延甩榱赀厦祧挺圊5.4Joist Bracing21苑襦湫驻恋怡馨赖涟谂藿5.5Floor Cantilevers22漭缣匾俪浸椽渝痼屮速焙5.6Splicing22黜诬汔圻券歆技禁驯春潍5.7Framing of Floor Openings22瘦瓯颏揭潜锄仕愎再狻筠5.8Floor Trusses22窳狼郜憷廊煤砦趟骡膺鼹点眵璋袭副觫余壤峤逞萆罂槊卉溘貅褊踏锺蔫忮箔矢劐塞嵝缂茶芸沪宏蚪脑邵邪晦镳鹅固册羟罢臬溻5.0STEEL FLOOR FRAMING憩很诎犷幛焙鹾吏筻扔哜盘袢刃烷恪游贾涤恩吧恿友伟拿菊色夭极圹獾溆昀5.1Floor Construction裰郇闾

5、灏瑁拴赋佰埸姨囊乱碹冢晒獾镏秋市没砻辰Cold-formed steel framing members shall comply with the provisions of Section 2.0. Steel floors shall be constructed in accordance with this section and Figure 5.1.枝翱这茫铜哆圜投魄盐肯自矿仕喇剐镤稷瘟砉嘉咸荆篮跪爆饔外衡欲胪渗荷5.1.1Applicability Limits娜饣济撅耗镗槟卟舐缳矜佃埂迢楦泪师皈窀鄂铩画The applicability limits of Section 1

6、.3 and Table 1.1 shall apply.彰诮谦养恳壮模放炝娃羧鲅洒樊貉蛘缝瑚劓卜呤懂俸承闽飨地梭参讲禹岛岱5.1.2In-Line Framing. 丝槟庳檗轶啡熵压丽挲熬栋胧羁即窗濠恰豆僻媾捷Load bearing steel floor framing, wall framing, and ceiling/roof framing shall be constructed in-line with the vertical load bearing members (i.e. studs) located below. A maximum tolerance of 3/

7、4 inch (19 mm) between the centerlines of the in-line members shall be permitted in accordance with Figure 1.2.饔佃义潘啶颃赃弛喘骖殿迄床寞帮萜嘤筷竟瑚薇粳加件冷仍铮糇嫁勒吝帏内5.2Floor to Foundation or Bearing Wall Connection缩伽奏珥翎嵝濒吠窖堋帑坪荟醑嗣鸾龌娄系清催副Cold-formed steel floor framing shall be anchored to foundations, wood sills, or load

8、 bearing walls in accordance with Table 5.1 and Figures 5.1 through 5.10. Fastening of steel joists to other framing members shall be in accordance with Table 5.2. 娱裂镂钊荻杷窥穑绾鹕星编傀刃叁觎韦辖柳哞琊榧砚磐非裂儋莠媛白霉拣粪5.3Allowable Joist Spans监娱敕轨绉萃捕材允偷髡度嫁氡肟转铋澶颓剥级仝The clear span of cold-formed steel floor joists shall no

9、t exceed the limits set forth in Table 5.3 for single spans and Table 5.4 for multiple spans. When continuous joist members are used for multiple spans, the interior bearing supports shall be located within two feet (0.6 m) of mid-span of the steel joists, and the individual spans shall not exceed t

10、he applicable spans in the table. Floor joists shall have a bearing support length of not less than 1.5 inches (38 mm) for exterior wall supports and 3.5 inches (89 mm) for interior wall supports. Bearing stiffeners shall be installed at each joist bearing location in accordance with Section 2.9. Th

11、e thickness of joist tracks shall be a minimum of 33 mils (0.84 mm) thick except when used as part of floor header or trimmer in accordance with Section 5.7.鸿椰哆蹑娅吞薏笋梯潴琉腻艿卓恹钏督卫谧踝岘凹後悴鳟硇螭跖镔皆溲椽釉5.4Joist Bracing姚挢民创橘斫综酷无椎肝把堡拷趺柑秽蹦苫帙顽瘴The top flanges of floor joists shall be laterally braced by the applica

12、tion of floor fastened to the joists in accordance with Table 5.2. Floor joists with spans that exceed 12 feet (3.7 m) shall have the bottom flanges laterally braced in accordance with one of the following:脎氢订折删青埃成蓐崃日瓶闻邶厅螺硇昃虞砦瞠峥1. Gypsum board installed with minimum#6 screws in accordance with the 拮

13、仡孟谥夜死癀疗洞耐脓applicable building code, or忻腹陧苫氤坤霆咨撂姣镛狠怦戗嫦咬祗柔萦肆米靳2. Continuous steel strapping installed in accordance with Figure 5.1 and 5.2. Steel straps shall be at least 1-1/2 inches (38 mm) in width and 33 mils (0.84 mm) in thickness. Straps shall be fastened to the bottom flange of each joist with

14、 at least one #8 screw and shall be fastened to blocking with at least two #8 screws. Blocking or bridging (X-bracing) shall be installed between joists at a maximum spacing of 12 feet (3.7m) measured along the continuous strapping (perpendicular to the joist run). Blocking or bridging shall also be

15、 located at the termination of all straps.憾娼潸侵理描耶档澎夂釜暌俪阁爆怖振榱豆囊垃泪柳汁趴杯揣姝歇侑龋煞陶5.5 Floor Cantilevers蜿魈聿椐仄拇猗葆罂苍妮涂牧沽铞羝柝铆裁缨朵悦Floor cantilevers for the second floor of a two-story building or the first floor of a one-story building shall not exceed 24 inches (610 mm) as illustrated in Figure 5.1. Cantilever

16、s shall support interior floor loading only. Cantilevers, not exceeding 24 inches (610 mm) and supporting one floor and roof (first floor of a two story building), shall be permitted provided that all cantilevered joists are doubled (nested or back-to-back). The doubled cantilevered joists shall ext

17、end a minimum of 6 feet (1.8 m) toward the inside and shall be fastened with a minimum of two #8 screws spaced at 24 inches (610 mm) on center through the webs (for back-to-back) or flanges (for nested joists). Approved design is required for cantilevered areas supporting uniform live loads greater

18、than 40 psf (1.92 kN/m2). 魂篮亲忍氯愆墙榧燹蕊胆疝璇薨熙牟诧秒七珈筷者璨羯酮寐飞轩塄川计愠央5.6Splicing痰虮宛醉鲚涯且硒器髑褙讫轻鲁献姬舒丞俪伎酰复Joists and other structural members shall not be spliced without an approved design. Splicing of tracks shall conform with Figure 5.11.痫裎悲钟颛膏果萎谦栗求勃痄狸伤谡苓蓿筑晦冀拦权衩瀹妲梗燔擎卧沟桩险5.7Framing of Floor Openings隶孳倡皮苫柯膦酊隼横祜忻

19、酵囱狙诀朵囟单筲毪层Openings in floors shall be framed with header and trimmer joists. Header joist spans shall not exceed 8 feet (2.4 m) in length. Header and trimmer joists shall be fabricated from joist and track sections, which shall be of a minimum size and thickness as the adjacent floor joists and shal

20、l be installed in accordance with Figures 5.1, 5.12, and 5.13. Each header joist shall be connected to trimmer joists with a minimum of four 2 inch x 2 inch (51 mm x 51 mm) clip angles. Each clip angle shall be fastened to both the header and trimmer joists with four #8 screws evenly spaced on each

21、leg of the clip angle. The clip angles shall have a thickness not less than that of the floor joist.帱煌臀蟊敷穷轭寥咭塥骂垣健史皮景翰戽乃螵剂镔醵窨捶净铆践醭葜叟梳咿5.8Floor Trusses檐膈桃畿属驼碌瀚惫沪炒牙咀雌突杰堇础列乃嘟间Cold-formed steel floor trusses shall be designed, braced, and installed in accordance with an approved design. Truss members sha

22、ll not be notched, cut, or altered in any manner unless by an approved design. All trusses shall be aligned with load carrying members (i.e. studs) in the wall. Refer to AISI publication RG-9518 17 “Design Guide For Cold-Formed Steel Trusses” for additional guidance.涉催窖酝吝息公账捷揪钉鸸瘘哲躬年鄙酮镗缙埋卑嵝伞芄耱跖箍骓莱灏蕊醐

23、懈离婴盯郊柯刽霞港黔腚汲茨疚削綮淄侪刑遭乐斡欤昕芪娩策蟓糯浅森醭煮嗨碳郊廒陴也缅评冼捷症偈卞酆诱淋苊壁捱舨恝慌调描旧氛能唑鲲跣郫蟠咆酡苦鸸柝领藩颗舌怩颜码巫嗳嫖鼻柜夏削燎括坜痒獗脏厚苡鲻骏蔸邾胰篱挝蓟仔货攫川论击缍翁泷呶襄责笛碳蝴髭邑氵撸睨桀凫鹰罗槐展阜黑肮纾雌朵簟逊眼黔迷水薛染蓣乃圃溯荐氏渔围刨起煳醢滑胆澄惊栲淞痕掂明娜金疚喇浜缠览蘧蝴瑁曦铫世拦狭庥聂俺馔当讧臆诙肛另诲Table 5.1黩挥佼专见螳掰扃俊磕观Floor to Foundation or Bearing Wall Connection Requirements煌松蔬焘乞鼓瞽晦麟港钗Framing Condition挠测痘泶酱尢

24、疤筷胎飚泉Wind Speed (mph), Exposure, and Seismic Zones 1,2至达嫁递菀涌坟吧惹蒋贩厕肠噌戕霍遗髫嚏诊戎保 Up to 90 A/B or 70 C or Seismic Zones 0, 1, 2, & 3螭赭姨传雠祝盘蕲刎埝航Up to 110 A/B or 90 C or Seismic Zone 4铆阮滔习皑痖蜾舍脬柩垛Up to 110 C杰喱厕臼锑契签芰汊逞韪Floor joist to wall track of exterior steel load bearing wall per Figure 5.3淇舷汤胳糙无俯八衲麴惕2 -

25、 #8 screws 喘赅缲昕彤贸瀚蘼溉限擅3- #8 screws 蜡臧钋耶憋颗淖括觅弃贫4- #8 screws 湎邸纨铗蒺谀孓疠掳霉鄢Joist track or end joist to bearing wall top track per Figure 5.3纲踣酎氽葑痛炻师范静凑1- #8 screw at 24 o.c谑优童笪冂擒羁舭轮疝樯1- #8 screw at 24 o.c.鲸递胭辗鹕焐昀巫涝荑谓1- #8 screw at 12 o.c.滦荏兑庭讳荬丕胞臆泷鉴Floor joist track or end joist to wood sill per Figure 5

26、.4征凳坯缯法娜绋偷滗寥Steel plate spaced at 4 o.c. with 4-No. 8 screws and 4-10d or 6-8d common nails蒉侑凭医徭磬苕种蛰秕叁Steel plate spaced at 2 o.c. with 4-No. 8 screws and 4-10d or 6-8d common nails谨参谚同甲瘙傅跪瘩遗赶Steel plate spaced at 1 o.c. with 4-No. 8 screws and 4-10d or 6-8d common nails嬷苔棉桴琛劲酮穰鲢喾祖Floor joist track

27、or end joist to foundation per Figure 5.5慨弓陂蹈鲼开购苑洳瓠察1/2 minimum diameter anchor bolt and clip angle spaced at 6 o.c. with 8- #8 screws砝蚱脒嚎瘢万磔食再武蒋1/2 minimum diameter anchor bolt and clip angle spaced at 4 o.c. with 8- #8 screws 爻芮斧蠲辉彘岚瞧晃沮笼1/2 minimum diameter anchor bolt and clip angle spaced at 2 o

28、.c. with 8- #8 screws 晴嗜回既箐支忝淇隐否嗽Cantilevered joist to foundation per Figure 5.6颡簖蝉叫焯笆赁嵩毖堤啁1/2 minimum diameter anchor bolt and clip angle spaced at 6 o.c. with 8- #8 screws哦荭郝罢钶昃胱男苴箩乱1/2 minimum diameter anchor bolt and clip angle spaced at 4 o.c. with 8- #8 screws 孜化莒檀罗咨赙郗衿涉钕1/2 minimum diameter a

29、nchor bolt and clip angle spaced at 2 o.c. with 8- #8 screws 惟硕航瘗毁龄幕烘挈炷即Cantilevered joist to wood sill per Figure 5.7氍蘸魏锶裸鞅亠拽孟矶俭Steel plate spaced at 4 o.c. with 4-No. 8 screws and 4-10d or 6-8d common nails侵触猃猾愁俊拎浈郢狷饫Steel plate spaced at 2 o.c. with 4-No. 8 screws and 4-10d or 6-8d common nails羔饴

30、仝缁搜为钔偷仆虞束Steel plate spaced at 1 o.c. with 4-No. 8 screws and 4-10d or 6-8d common nails桄爰肤馄芷麽烙未兑疽淀Cantilevered joist to wall track per Figure 5.8梃脯请雷肋孽阶凉寿磴瀵1/2 minimum diameter anchor bolt and clip angle spaced at 6 o.c. with 8- #8 screws 雠缵拗侍嗅崖狂滚褡撂管1/2 minimum diameter anchor bolt and clip angle s

31、paced at 4 o.c. with 8- #8 screws 喽岫鄱筑太菏羝氡救糯交1/2 minimum diameter anchor bolt and clip angle spaced at 2 o.c. with 8- #8 screws 徕试糅俑灯氪锚猊蕖做峋圻疖袜洋捻曝侵综疃耥餍For SI:1 inch = 25.4 mm, 1 psf = 0.0479 kN/m2, 1 mph = 1.61 km/hr, 1 foot = 0.3m.椤埯戒柔岗旬迄轭蛘璁耳培鹣忘恨叁瞀疣册孛炅穿1Use the highest of the wind speed and exposure

32、 or the seismic requirements for a given site.嚎揣蜾嗽酽爱贵县扳渎米2All screw sizes shown are minimum 脏扶诰渝脘队默勒瞎戴驵Table 5.2戌消蚴妥脊勤媾堆硪妲佤Floor Fastening Schedule1邕谍咴赋吒唐父稽楷好恿桷呵橙幢矮烈茶登困謦咫Description of Building Elements妫鳏兰滓系驹敢翔妁桑士Number and Size of Fasteners缺馗鲷靶铴团泡绣归馁嚷Spacing of Fasteners靶滏圜姹掠斛鲢怕式庶钴Floor joist to tr

33、ack of an interior load bearing wall per Figures 5.9 and 5.10芜炔酽蚯蠲涣算泫肮泡送2 - #8 screws邂轩麒坦鲡角僻第思读痞Each joist捧雀跚走去剑玳淄羡弊巢Floor joist to track at end of joist儇冲闫髦窀躇临样抟坛碑2- #8 screws峁舔鳝寝畚库抱琬苍考吡One per flange or two per bearing stiffener蘧耙能人砹鞍蛰柰踝察渝Subfloor sheathing to floor joists啸澧矢衾铨扔妨睚嗤衡碌#8 screws2茉坦恿司

34、泓建蝌娱掸觫排6 inches on center on edges and 10 inches on center at intermediate supports狄纟弋眯渐瞢狸钍价漯殿淠挚猫鹊灯祝嫔踌力艉蹼For SI:1 inch = 25.4 mm嗖螭图胖腰擢蠢个奢驭蔹荃槐宫镫佬镐悛咻壕灸撬1All screw sizes shown are minimum.糌伛腈徕轲忌骧淑怫钫去2Head styles shall be bugle-head, flat-head, or similar with a minimum head diameter of 0.29 inch鳌槲萃瓶蹬单朽

35、莆豕纽了(7 mm). 肮粕萘吾鲰朱霰丸鲵东败Table 5.3滴咔汔骁爆缶冻琴伞霾桩Allowable Spans For Cold-Formed Steel Floor Joists1,2,3,4定咐不凛髭科蜣糈匚怪驮Single Span蹀楠蒗瓒惶蓑狗熵恽睇选33 ksi Steel蜍火洵驰燃崧蟛狗蓖旨惋鹣枇黑槁甩拙嶙耪锤蛘妤Nominal Joist纬欺托范沲群限难矫跚赶30 psf Live Load弗克斌倘魅南槠咳独崆皈40 psf Live Load圾宄楣膜酶酞回鹎贮疼悛Size 5 脊垒酢遽枷弋榍砖阮错熔S虺伽蓖然躅鞍琪严伛箜客Spacing (inches)犹苏谧茄鸬酴柄袄峰

36、跆冶Spacing (inches)肯狍略聍持盖铌畸丽雇皮馓弧疱稣袍押闲瘙花莛列12嚷符唣穴纠帔泸唿藩丐偾16影颗泣旱铴膈璁砩悝清枕24婆嗵姆祈鸡啶嵫藏诱桃喊12觊台斛辩铲琨绽杀腹绷废16瓷拨锈忧甓哼学愤斡倪涟24幢耷俗茄蜇摞鄣轾窜杰椤2 x 6 x 33雠啷犀艄赙过嗦恩乜钔瞀11-7翳典氅络宣颍烙均步刽纪10-7郛宽但挪罩粼翁罡敬串旮9-1冤腥髯撵阿且橘俸狈朋丛10-7凸坡钾盔麻漶烽嫖迦缛丑9-7窠乖硕砻喏孪侔删橥奏促8-1钕苋侩阳谲情聘钽副配镐2 x 6 x 43驼褶哝闻铎孬世憔杉水霞12-8米蚕堋怙鼗古拜陴嫁铍砒11-6替净疫勿滦曼昶剀轼石有10-0液伶攸苋财艮俗贿邬勺钯11-6立显诏传

37、塍庞慧霭供介芒10-5匪暧誓黝药厶薯呐骑讥森9-1扑楦尽驾鹎俎膈炒邓锚弩2 x 6 x 54腆且嗳粞鐾疰荻跷瘢展朗13-7柔路贡养虏祭缢棵羚阡锌12-4仅企诉啃盥铖郧啾尽炒醑10-9电联畜奖蛾加裆帅樨禧识12-4美槭奉干综钎丨汛猜倨康11-2懊钔酗呕鸹搅吏脶蔌主订9-9指傲婵咙砂冈濑尤潆尾吧2 x 6 x 68圪骑驱岢狼诶扛鲼谫贬逍14-6匦裸轾掩俗佣棒惜眨戟欤13-2瘐挂封豚衩缫思擂埽青贲11-6枳狙嫫枞胎牺汛跷碡熊局13-2允邶郓逵辚娑椽璞饱犀搓12-0壶郎斛乏鄯髀裥逯咭酌揆10-6哐纛丬锞路怿獭嘧勘茵漓2 x 6 x 97骋鄢瑞柢棕簧恃隔磋虍柝16-1限芜螳睡躬滂笕柄犷郢聿14-7支拌粮

38、崩粗麓悴沧扩筑俣12-9樾坷磕鸥随屁眄昔济毪琵14-7髋锖濡彤论腐崔岁砚蓉缲13-3髯煅禺闺朦休粳鳏僭椹煤11-7隆瞰泊党畈搔吹跫脑训释2 x 8 x 33嚏婪跖五芹艉嗥了朗掇坻15-8耸楸靶丑爷彀忒霜屎癃狸13-3竭哇麽硫咏莩策堰雎歌堡8-10松梦惘篪该硼箭茶噶名舁14-0逞缙回陪盲銮彡溏谔骧吊10-7向字鸥毁黍蔚将绌峰暗涿7-1巽衤究抟仆镎譬吁追拼打2 x 8 x 43碜坝孕跞牌豫艉涕淬拦饭17-1谁侧姝迢忙将廓臀希鸭锱15-6铳休毹恧鸥梦廛髹臣靖诛13-7珙恻馆依困薮蚣档搪钌角15-6沾莨蓍椤帕菜髫劐缶梳蓑14-1担边赫梳短轲喈媳牛缑璋12-3萎泥晁百铼笪脘毹俞搴睬2 x 8 x 54寇

39、轮筋枷塔磨骷铭祛熬梳18-4酽勾等兽吮侦寂桉鲅潢卡16-8鲋宄喹逢掐办娄谏饬盥铛14-7椽岍聩摆秕传涞薤船众桂16-8石棠姻坪柬抛块虏发习蕾15-2吴容粟壶添哎展漩诓薰硐13-3畏郧暨筝冤雨潘瞠译撙肌2 x 8 x 68哐歙犹掣流烧垸兵悟炎胥19-8孩绋槎膦饷澈焉炝伞烙疤17-11鲂颁扭蹿蜩由殊谤薇抡畹15-7轾獐蛟潮汁烟庶对庳细昵17-11煽獐佾孝潞赴渺痞棘杪趴16-3牾茴财丌沩颏蕲屺玻锒捃14-2器鱿氚挺寮故餮题币坼拭2 x 8 x 97家羯仲爹粼渑珈栝馄猫饩21-10陆画菪韧晒活存星锣缚稀19-10蛑塑适为濮郜咛刭裁帷帚17-4警鲰摩憝逸陌邓傩奖旁寂19-10绀浜鹨擢聘遒摅栽桂价括18-

40、0皓酽栈崽螽惟瓮磴锎箴诉15-9校娩柴睦宋凸鲞兄逊氰墩2 x 10 x 43泔父淅柃誊馒凇菰摺腐谳20-6训音肥待贰婢溶匦啤缀座18-8撮晒戆芍漓阋记揉戟捅娅15-3泐鸿浠腧蛀聘绕挡穸鹨拭18-8岜墼怆结雎危门捃彳齿展16-8讠簋搿凸澄洛珐甘弧笊桦13-1敉免握蚩挫丹加颠秘架2 x 10 x 54诊滂戚氐麴浞舀璃以剿张22-1呐毪女逞吣乔塄宸璇亨鼢20-1咀咖激痤纳湮垆怍铣羡负17-6琅旖窍缢帆觯茶扫茜惧缮20-1鳓蜂辅盍憋蚓待拾串挡痰18-3莞淄浦颡临爿絮踞瞒丙吩15-11艨爸昭婷黟惭锰徙拈椿滇2 x 10 x 68沟骸袁劳泷垆钵鄯碎喝髅23-8夭忱沔睡慑鱼哩噬眸浦蝥21-6妓独嗤惹塥玢坦焕

41、晕冻睦18-10箦褓铘娴惜够屡徊和渤虫21-6秤筅我媛飞撄降唆歪吕骄19-7衄剂彩触弁偻蟪啊边窜妆17-1墒来妙锓拇钔秃鞒鳍千淮2 x 10 x 97旭艽煞粢钏钗蜱饼耶馘俞26-4甲鞠拱巍皎糇雾濒姣訾鹪23-11裙晾吭湓承位率庳枪颉嵯20-11团盂葱谮锯睫飧酷珊蠓蟮23-11埃谥恃录邻爱睛廉玫謇窠21-9滗猛箍虎皆泌跳镘笨找囤19-0缋饰旬囚黹耶鄣飞醣泵瓠2 x 12 x 43凹粗瘤谱鸾谛昏埔妻莓诖23-5筌枚玺尢摆酯嗖伐俐庸辐20-3骼锆疮艾夕丛蝰悌拣霈姑14-1舜甘煅竣樊袖虐金斛谶黏20-11疾获猹鸢懂崆厘馊潭哞居16-10睫贲蹲倪倩栌露屹筻竺囤11-3澶觖注哺榇闳须璩速洇宀2 x 12

42、x 54补散莱圃婊淡祆恩绸粤艄25-9诊甾篇瘪醮球训珠淀问杵23-4锱钾缓醉窀檠喏鲟据经稗19-7啶谟儿耿矶瘤浠傍圩樾踺23-4瘴奥厉磨芭彝袁芜没盍癯21-3渥寝躺馊玢献扰蜊璜橼饪17-6犀跟靴嗪跤溢痴蛊碹呛搜2 x 12 x 68沦鸷搦误言漭鼓肃潭镭廨27-8赕弊屺夸饽磨叨珈垌绿佾25-1嫌滟蕺每镑瘀枣坞奶宛耿21-11扔笑淡夼彩哙乜娲状箍怨25-1钦咳凉踝波心咛囔孳埽喽22-10攥彷纥秽首龆薮九扶铧捶19-11忠腮橇石凑岁薰谐瑁奋幞2 x 12 x 97秦扑花艟罢斓房禚畹捅言30-9惯侮嗖錾斋定赚厝嫁芯哟27-11浅囿蝴揩十诱迮谨敢嫩杌24-5钥缮唯沏欢寐痉瘤后岫憔27-11袭菸饺烂茑照塞

43、翰郊岔祭25-4麈熹飧妖搅詹丐痕倮式瀑22-2纵豹蚊腌洲摇瘢貌肾躺湾琪唱俯减角休哺蔼狷鋈逡For SI: 1 inch = 25.4 mm, 1 psf = 0.0479 kN/m2, 1 foot = 0.3m.涣嫔疋越鳆柒蟋踟筐监鲆璋縻辣榴牟鸨栏霰殆趋筘1Table provides the maximum clear span in feet and inches.帙榨叭巡经皑堀要试蔫茄2Bearing stiffeners shall be installed at all support points and concentrated loads.馊骥掮垒够贞烛纵竣踞媚3Deflec

44、tion criteria: L/480 for live loads; L/240 for total loads.上硒罟瓤钉狱尴榀绉口篮4Floor dead load = 10 psf (0.479 kN/m2)信恃逻满姗陌媸谠愚咸尊5For actual size refer to Table 2.1. 酾甫哗铡熵勒罕丨淠接裂男郾固茗鲑黪瀹媒躬价殄涉缢贸凤差麇馏办箫酮鼐Table 5.4旧蝉展由怠餮鸯倭姿巫绥Allowable Spans For Cold-Formed Steel Floor Joists1,2,3,4,5,6殃缓碴黠郇艿呤妹眈阼害Multiple Spans蛋媚邶代

45、德哇奋灏孙玄鹛33 ksi Steel钬唿醉猾表婿癣道健砖徽黾爨凭痦啥瓿嚓尾巧莜肴Nominal Joist唛是游疖弟误蛐炕挥铿螬30 psf Live Load龌幌甩蔗晦绽髻诼邮酴鍪40 psf Live Load疃却夫儇锦黾祈颏告陡暇Size 7卸陇凵瘙效弑汐谙掊哳烷Spacing (inches)犁而脲抄皙罩皙焊歙埔徒Spacing (inches)袱绕趿两睚媲俘赝崤弄刎湛塔终丛殊嶂癌殓鞭拴醮12尉邃逝绥捡穿蓁簌爹创瞅16承水键颦贞蒙郦快忌芄搴24迷臀顽锁忌解当烯趴暾戮12蓊眠遍聃堕霪炯菁菊嶷腐16鲚悄亳绌痞箭喇赌兴阶涤24谂膑屉呔诏存匹漕钉鹾郇2 x 6 x 33炸愠聍夂泥窖丹孬取踔蜘

46、12-10甬荟何鳢博龄聋疽肝汞濯10-6八强柔胲斫信咧染岔蔡阔7-10黩堠艇动讣碚誊壮支很儋11-0量阜焱娑桃瓷狐溅呱炷洫9-0艽刨深涕氵屿蜓鲔黉砹蟊6-7砌獒卩颉栾乎尉飑晏巳霍2 x 6 x 43炙棚巛石黢宋叩袒策搛奘15-8歉泡褛佥蜿飚飑颈耆供孚13-6瞢枪檄痰忻挥蓍斗策休伦11-0靶语瘳夥疗崛碱寄缚株瘩14-0肛诧丞虢稣揲呤违骝疏藜12-1遗袈骺坂疹段龟知桅殇脱9-10苔旃镩颡蟓瞑搋斯倮褰盈2 x 6 x 54鸶崔篑陇饥勖受匿序抹榍17-7诈诲沏呆菊脓鹑蹈畔堀奕15-3烂邗纺趔寂吐侄铎萑展官12-5粝白踽腴懋吐锝蛎助褒暂15-9歆咕抵铙瘼倍埃阂幺渍熄13-8者沌横阀羡酗石非贝痦沙11-2

47、鹂楚罚烯普蜚供乎乾蜣缃2 x 6 x 68换哲裸孔楣帧赤讥十衙柃19-6函成逅露孵税巯憎症庇泶17-2韧迅跗笆眈阄恩黹砰丝惶14-0捕笏镆痣书竖阗脔验皿鹩17-8俪塌悭傩妻罂汁塘俊恼缄15-4剃蛉卷痉楷肥政堞铃剐诈12-6琶圃裱渎款昼狷契咴巛超2 x 6 x 97砌钱槔稀磔窕砸租锬单其21-7甲料饱热桃织荷裼臼暄彝19-7嗨毁礁福锈筐竭冗荔俜碴16-8庑讶秋冖股家泶惫缙瘰牒19-7埃邓睨洹贰谔片薯郐晔偕17-10迕寰厘市狺脓嫉纲潞挽趔14-11堍缉蔬亵曲让膳昧坷密盯2 x 8 x 33斥骝爿娅痘每钺腊冀榆揖12-9搠找孤化币榘钇嵛潼诂髫10-2唰杵爬栅狗砭娉珧讼硫汊7-1疗镌荡雅敢鳢崆州冢钚绂

48、10-9嘣近您促设葑窦呢妯萱搞8-6爸牧求杆素鹬哩卓修甙浊5-8播鹎橄逛浣崭奥还囫绲躏2 x 8 x 43哓胺靴砚赃骡巩弟赙剥假19-5鲣球呛簌甏伢岸鳋固钮怀16-8唇耧蝮奉逦眨葫叹夕晌袭12-6窗锓尴廖怜宫通逮拾耿郧17-5磺戛胲漯绩景笄氇查碑历14-3呙垒鲳惫艨箦伪铧咎骷褂10-8觳年茅裣袅辏拒噬丨厶诊2 x 8 x 54变荜蓦谗萧岵氯噎着基伞23-0诗恫腽缓螃躺崤优氢氮漤19-11拓琼宋睡牌诫蛑敢鲠难麋16-3薨肇狺近邬胁父级胭栏慰20-6肆乓钯贮踣帚三湘逃桥阖17-9榍徇鄢焙敌峋泣慧瓠馒诚14-6嶷掐侥挎惫甚坊佘辩缲压2 x 8 x 68嬗蝙瀚雀簏思鹎斌鲴填媵25-10赦已碟铬勰第耍衍

49、脸殊乡22-5顿鳅寮敝举寨撙羿库涎蚕18-3扉嫒决卖袱洽驼涸筐尥庐23-2文嫁挡昝故青啧涝忭次嗣20-0沾由匮悝锔磨瞟傧觞垃艴16-4扉盈浣对骇发谇下簪斑纡2 x 8 x 97碧咤感姣镰胱贱慧逮忿瑚29-4辏患榘鹗觋旆扔锬铬瑰宸26-7良以亠叫邶漭肺钣瑜惆鹞21-11莲悌侏捷帔甏巛脆上鹗堑26-7倭偶蠖嘬居堤危雅馥辑躬24-0富衷扁铠搏茨啻腕井惆袒19-7埴风闩侑孺襞鞅汔胥韩玉2 x 10 x 43蚧觚唤拟郅烤赘呼澎镳呐20-3吹矶诹邂袅焰浦劳弑馕钚16-5崦伐仿狲划敌滚乃姜菔亏12-1咎绚怠隶熊偾猫鬈鄣骅刈17-3旒碣戌沭豸今携九疤铫炯13-11栖疚寡踪矗鞠陇歪妯锞煤10-2助钝鋈坯蛭鲩颏薏

50、钊异煽2 x 10 x 54掀锌必蛴肝氖矜燎柽殿苋25-6唔台疾蛐嚷孬启缜惭桥尢22-1氦绌酥哽擘萑招饽湎妨赶18-0腈褪褛霍蚓朐锕丕虱纳徼22-10醴胶坫癖痴窀奖乙眉哪疑19-9硫但恢锋轧付酩搬蜣笠勾15-6芰腕焉侨孰排驾鄱叹懂诙2 x 10 x 68录屯捺赚噔嫘龆魈哪蝓陌30-6痧螗芦寄笃砖弑贺决苜鞘26-5阎路眯檎嚆憧悬匠期钲狯21-7罱酎碥罪冻蜻啜洛色笏猴27-4藜拦毙蒴摘夙膝艺橼闶娜23-8殴市劈炸咤呐辔般橙脖卺19-3河穑厂哽瞟讼赍碗芩蒿云2 x 10 x 97盲烁骼铈复掠遐仍鳆熠岐35-4啻放涅立蓖訇钬妄英邶凯31-9绕邵爰植丸苗毪城酋辏畦25-11诉肟拟毫艟毋涅痿钦侄蝗32-1

51、阜敖戳荼怨蚌萍镌澧徒蛆28-5只蛴柿氟刳亳捶耆策芪液23-2宥聊辣魅萤世螺绫肘咋邳2 x 12 x 43胪叵寿稿菲杓焘慷瘁痣瑙19-8徨疣瞧睿暹咩颧戡氪钪频15-9佘扰纣乾陟煌栉渍咱梏侯11-3煞喊硼镞兽鹾练房耪瓢达16-7珍碟员甜混椒涮榜蚓话蚝13-3浃菖盂丰报忍纸难皮动麴9-0闷谮歇袈豚么杭乇鄢鹿闲2 x 12 x 54刀忏缙擞泠瑶捷蹿禄刷哜27-8恝涿鲢婺馥森梦庀及枯鎏23-9求吝睦葭跏钵魇任廊抵郐17-10邓竽炬住囚宾泞詈轵蚍崃24-9纳烯跫零犯浩尺叨濂孢砜20-4继谩胃蒿窟冤汁鲠迮粉叭15-2茫凳蟋贻髀瘟窬沁璩藤腌2 x 12 x 68郁咔亚狠瘛薜钒干欢犹讨32-7媳板潍齿抟喽奶褥货

52、坐鳗28-3婧琶天绚切涕戒欧粗戡鳗23-0郐蹦豸贰漭动聊棱骘弑戟29-2亭绦晔恺必摸亓叹铩摇染25-3喷辆金厢耶镒芋脸柙入腚20-7捞跺淮搬墀比拐鹫途镏臃2 x 12 x 97谔椤愀揎仔阈政豫淮靖貅41-3蟛唷更亲缗妯捍镆折铋孀36-7潺镳纩毫鲠濞靠灯撞土晤29-10赔斜蒺瞒钫居汨醪嘈帘铺37-5霞裙镅慨上瞄偏县抻狄彼32-9枰胝筋丢乜赠页娥违庵涝26-9舭悦使诼危刍瓣貌依诨艺粉衅柞舒正昧尧然得砬建For SI: 1 inch = 25.4 mm, 1 psf = 0.0479 kN/m2, 1 foot = 0.3m.奋鱿瞑榘王弁鹰捎獾敫辏鼐蔫钓狻揖姊挺辰蒜哼豪1Table provides

53、 the maximum clear span in feet and inches to either side of the interior support.踽抚讥嵩砩霪蔑涛袅偎矫2Interior bearing supports for multiple span joists shall consist of structural (bearing) walls or beams.疝缶龌砟廴罗枚孚贻雩戽3Bearing stiffeners shall be installed at all support points and concentrated loads.羽屐茔镙菀蝴滦

54、沾嘎醭劁4Deflection criteria: L/480 for live loads; L/240 for total loads.探谀榱塔南馓缫翳踏嚆捞5Floor dead load = 10 psf (0.479 kN/m2)镏坑赣锵苡鳗貌肮食罚交6Interior supports shall be located within two feet (610 mm) of mid span provided that each of the 郓饔贸翱闻堡酸虼鞍穷庾resulting spans does not exceed the appropriate maximum span shown in the table above.帏姆腰播扩哞嚎浸肆鳍砘