This UR does not apply to CSR Bulk Carriers and Oil Tankers or to container ships to which UR S11A is applicable.

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1 (1989) (Rev.1 199) (Rev. Nov 001) (Rev. June 00) (Rev.4 July 004) (Rev.5 Jn 006) (Rev.6 My 0) (Rev.7 Nov 0) (Rev.8 June 015) Longiudinl Srengh Sndrd.1 Applicion This requiremen pplies only o seel ships of lengh 90 m nd greer in unresriced service. or ships hving one or more of he following chrcerisics, specil ddiionl considerions my be pplied by ech Clssificion Sociey. (i) Proporion L/B 5 B/D.5 (ii) Lengh L 500 m (iii) Block coefficien Cb < 0.6 (iv) Lrge deck opening (v) Ships wih lrge flre (vi) Crrige of heed crgoes (vii) Unusul ype or design or bulk crriers wih noion BC-A, BC-B or BC-C, s defined in UR S5, his UR is o be complied wih by ships conrced for consrucion on or fer 1 July 00. or oher ships, his revision of his UR is o be complied wih by ships conrced for consrucion on or fer 1 July 004. This UR does no pply o CSR Bulk Crriers nd Oil Tnkers or o coniner ships o which UR A is pplicble.. Lods..1 Sill wer bending momen nd sher force..1.1 Generl Sill wer bending momens, Ms (kn-m), nd sill wer sher forces, s (kn), re o be clculed ech secion long he ship lengh for design crgo nd blls loding condiions s specified in..1.. or hese clculions, downwrd lods re ssumed o be ken s posiive vlues, nd re o be inegred in he forwrd direcion from he f end of L. The sign convenions of Ms nd s re s shown in ig. 1. Noes: 1. The conrced for consrucion de mens he de on which he conrc o build he vessel is signed beween he prospecive owner nd he shipbuilder. or furher deils regrding he de of conrc for consrucion, refer o ACS Procedurl Requiremen (PR) No. 9.. Chnges inroduced in Rev.5 of his UR re o be uniformly pplied by ACS Socieies on ships conrced for consrucion on or fer 1 July Chnges inroduced in Rev.7 of his UR re o be uniformly implemened by ACS Members on ships conrced for consrucion on or fer 1 July Chnges inroduced in Rev.8 of his UR re o be uniformly implemened by ACS Members on ships conrced for consrucion on or fer 1 July 016. Pge 1 of 1 ACS Req. 1989/Rev.8 015

2 ..1. Design loding condiions ig.1 Sign Convenions of Ms nd s n generl, he following design crgo nd blls loding condiions, bsed on moun of bunker, fresh wer nd sores deprure nd rrivl, re o be considered for he Ms nd s clculions. Where he moun nd disposiion of consumbles ny inermedie sge of he voyge re considered more severe, clculions for such inermedie condiions re o be submied in ddiion o hose for deprure nd rrivl condiions. Also, where ny bllsing nd/or debllsing is inended during voyge, clculions of he inermedie condiion jus before nd jus fer bllsing nd/or debllsing ny blls nk re o be submied nd where pproved included in he loding mnul for guidnce. Generl crgo ships, coniner ships, roll-on/roll-off nd refrigered crgo crriers, bulk crriers, ore crriers: - Homogeneous loding condiions mximum drugh; - Blls condiions; - Specil loding condiions e.g., coniner or ligh lod condiions less hn he mximum drugh, hevy crgo, empy holds or non-homogeneous crgo condiions, deck crgo condiions, ec., where pplicble; - All loding condiions specified in UR S5 Secion 4 for bulk crriers wih noion BC-A, BC-B or BC-C, s pplicble. Oil nkers: - Homogeneous loding condiions (excluding dry nd clen blls nks) nd blls or pr loded condiions; - Any specified non-uniform disribuion of loding; - Mid-voyge condiions reling o nk clening or oher operions where hese differ significnly from he blls condiions. Chemicl nkers: - Condiions s specified for oil nkers; - Condiions for high densiy or segreged crgo. Liquefied gs crriers: - Homogeneous loding condiions for ll pproved crgoes; - Blls condiions; - Crgo condiions where one or more nks re empy or prilly filled or where more hn one ype of crgo hving significnly differen densiies re crried. Pge of 1 ACS Req. 1989/Rev.8 015

3 Combinion Crriers: - Condiions s specified for oil nkers nd crgo ships...1. Prilly filled blls nks in blls loding condiions Blls loding condiions involving prilly filled pek nd/or oher blls nks deprure, rrivl or during inermedie condiions re no permied o be used s design condiions unless: design sress limis re sisfied for ll filling levels beween empy nd full, nd for bulk crriers, UR S17, s pplicble, is complied wih for ll filling levels beween empy nd full. To demonsre complince wih ll filling levels beween empy nd full, i will be ccepble if, in ech condiion deprure, rrivl nd where required by..1. ny inermedie condiion, he nks inended o be prilly filled re ssumed o be: empy full prilly filled inended level Where muliple nks re inended o be prilly filled, ll combinions of empy, full or prilly filled inended level for hose nks re o be invesiged. However, for convenionl ore crriers wih lrge wing wer blls nks in crgo re, where empy or full blls wer filling levels of one or mximum wo pirs of hese nks led o he ship s rim exceeding one of he following condiions, i is sufficien o demonsre complince wih mximum, minimum nd inended pril filling levels of hese one or mximum wo pirs of blls nks such h he ship s condiion does no exceed ny of hese rim limis. illing levels of ll oher wing blls nks re o be considered beween empy nd full. The rim condiions menioned bove re: rim by sern of % of he ship s lengh, or rim by bow of 1.5% of ship s lengh, or ny rim h cnno minin propeller immersion (/D) no less hn 5%, he disnce from propeller cenreline o he werline D propeller dimeer (see he following figure) The mximum nd minimum filling levels of he bove menioned pirs of side blls nks re o be indiced in he loding mnul. Pge of 1 ACS Req. 1989/Rev.8 015

4 ..1.4 Prilly filled blls nks in crgo loding condiions n crgo loding condiions, he requiremen in..1. pplies o he pek nks only Sequenil blls wer exchnge Requiremens of..1. nd..1.4 re no pplicble o blls wer exchnge using he sequenil mehod. However, bending momen nd sher force clculions for ech debllsing or bllsing sge in he blls wer exchnge sequence re o be included in he loding mnul or blls wer mngemen pln of ny vessel h inends o employ he sequenil blls wer exchnge mehod... Wve lods...1 Wve bending momen The wve bending momens, Mw, ech secion long he ship lengh re given by he following formule: ( + ) + 190MCL BCb ( ) 1MCL B( C + 0.7) M W (kn - m) or posiive momen M (kn - m) or negive momen W + b M Disribuion fcor given in ig. C L.75 0 for 90 L 00 or.75 for 00 L or.75 L 150 for 50 L 500 L Lengh of he ships in meres, defined by S B Grees moulded bredh in meres C b Block coefficien, defined by S, bu no o be ken less hn Wve sher force ig. Disribuion fcor M The wve sher forces, w, ech secion long he lengh of he ship re given by he following formule: W ( ) + 01CLB( C + 0.7) (kn) or posiive sher force + b Pge 4 of 1 ACS Req. 1989/Rev.8 015

5 W ( ) 0CLB( C + 0.7) (kn) or negive sher force b 1, Disribuion fcors given in igs. nd 4 C, L, B, C b As specified in...1 ig. Disribuion fcor 1 ig.4 Disribuion fcor. Bending srengh..1 Bending srengh midships..1.1 Secion modulus (i) Hull secion modulus, Z, clculed in ccordnce wih S5, is no o be less hn he vlues given by he following formul in wy of 0.4 L midships for he sill wer bending momens Ms given in..1.1 nd he wve bending momens Mw given in...1, respecively: Ms + Mw (cm ) Pge 5 of 1 ACS Req. 1989/Rev.8 015

6 permissible bending sress 175/k (N/mm ) k 1.0 for ordinry hull srucurl seel k < 1.0 for higher ensile seel ccording o S4. (ii) n ny cse, he longiudinl srengh of he ship is o be in complince wih S Momen of ineri Momen of ineri of hull secion he midship poin is no o be less hn CL B( C 0.7) (cm 4 ) min b + C, L, B, C b As specified in Bending srengh ouside midships The required bending srengh ouside 0.4L midships is o be deermined he discreion of ech Clssificion Sociey. As minimum, hull girder bending srengh checks re o be crried ou he following locions: - n wy of he forwrd end of he engine room. - n wy of he forwrd end of he foremos crgo hold. - A ny locions where here re significn chnges in hull cross-secion. - A ny locions where here re chnges in he frming sysem. Buckling srengh of members conribuing o he longiudinl srengh nd subjeced o compressive nd sher sresses is o be checked, in priculr in regions where chnges in he frming sysem or significn chnges in he hull cross-secion occur. The buckling evluion crieri used for his check is deermined by ech Clssificion Sociey. Coninuiy of srucure is be minined hroughou he lengh of he ship. Where significn chnges in srucurl rrngemen occur deque rnsiionl srucure is o be provided. or ships wih lrge deck openings such s coninerships, secions or ner o he f nd forwrd qurer lengh posiions re o be checked. or such ships wih crgo holds f of he supersrucure, deckhouse or engine room, srengh checks of secions in wy of he f end of he f-mos holds, nd he f end of he deckhouse or engine room re o be performed..4 Shering srengh.4.1 Generl The hickness requiremens given in.4. or.4. pply unless smller vlues re proved sisfcory by mehod of direc sress clculion pproved by ech Clssificion Sociey, where he clculed sher sress is no o exceed 1/k (N/mm ). Pge 6 of 1 ACS Req. 1989/Rev.8 015

7 .4. Shering srengh for ships wihou effecive longiudinl bulkheds (i) The hickness of side shell is no o be less hn he vlues given by he following formul for he sill wer sher forces s given in..1.1 nd he wve sher forces w given in..., respecively: 0.5s + w S (mm) Momen of ineri in cm 4 bou he horizonl neurl xis he secion under considerion S irs momen in cm, bou he neurl xis, of he re of he effecive longiudinl members beween he vericl level which he sher sress is being deermined nd he vericl exremiy of effecive longiudinl members, ken he secion under considerion permissible sher sress 1/k (N/mm ) k As specified in..1.1 (i) (ii) The vlue of s my be correced for he direc rnsmission of forces o he rnsverse bulkheds he discreion of ech Clssificion Sociey..4. Shering srengh for ships wih wo effecive longiudinl bulkheds The hickness of side shell nd longiudinl bulkheds re no o be less hn he vlues given by he following formule: or side shell: (0.5 φ)( s + w ) + sh S (mm) or longiudinl bulkheds: φ( s + w ) + bl S (mm) Φ rio of sher force shred by he longiudinl bulkhed o he ol sher force, nd given by ech Clssificion Sociey. sh, bl sher force cing upon he side shell pling nd longiudinl bulkhed pling, respecively, due o locl lods, nd given by ech Clssificion Sociey, subjec o he sign convenion specified in..1.1 S,, As specified in.4. (i).5 Buckling srengh.5.1 Applicion These requiremens pply o ple pnels nd longiudinls subjec o hull girder bending nd sher sresses. Pge 7 of 1 ACS Req. 1989/Rev.8 015

8 .5. lsic buckling sresses.5..1 lsic buckling of ples 1. Compression The idel elsic buckling sress is given by: b 0.9m (N/mm ) 00s or pling wih longiudinl siffeners (prllel o compressive sress): 8.4 m for 0 ψ 1 ψ or pling wih rnsverse siffeners (perpendiculr o compressive sress) s.1 m c 1 + for 0 ψ 1 ψ b modulus of elsiciy of meril.06 5 N/mm for seel ne hickness, in mm, of pling, considering sndrd deducions equl o he vlues given in he ble here fer: Srucure - Comprmens crrying dry bulk crgoes Sndrd deducion (mm) Limi vlues min-mx (mm) - One side exposure o blls nd/or liquid crgo Vericl surfces nd surfces sloped n ngle greer hn 5 0 o he horizonl line One side exposure o blls nd/or liquid crgo Horizonl surfces nd surfces sloped n ngle less hn 5 0 o he horizonl line - Two side exposure o blls nd/or liquid crgo Vericl surfces nd surfces sloped n ngle greer hn 5 0 o he horizonl line 0. - Pge 8 of 1 ACS Req. 1989/Rev.8 015

9 - Two side exposure o blls nd/or liquid crgo Horizonl surfces nd surfces sloped n ngle less hn 5 0 o he horizonl line s l c ψ shorer side of ple pnel, in m longer side of ple pnel, in m 1. when pling siffened by floors or deep girders 1.1 when siffeners re ngles or T-secions 1. when siffeners re bulb fls 1.05 when siffeners re fl brs rio beween smlles nd lrges compressive sress when liner vriion cross pnel.. Sher The idel elsic buckling sress is given by: b 0.9k (N/mm ) 00s s k , b, s nd l re given in lsic buckling of longiudinls 1. Column buckling wihou roion of he cross secion or he column buckling mode (perpendiculr o plne of pling) he idel elsic buckling sress is given by: (N/mm ) A A l momen of ineri, in cm 4, of longiudinl, including ple flnge nd clculed wih hickness s specified in cross-secionl re, in cm, of longiudinl, including ple flnge nd clculed wih hickness s specified in spn, in m, of longiudinl A ple flnge equl o he frme spcing my be included.. Torsionl buckling mode The idel elsic buckling sress for he orsionl mode is given by: π L K w m (N/mm ) p m p Pge 9 of 1 ACS Req. 1989/Rev.8 015

10 K m 4 C π 4 w 6 number of hlf wves, given by he following ble: 0 < K < 4 4 < K < 6 6 < K < 144 (m-1) m < K m (m+1) m 1 m p w S Venn's momen of ineri, in cm 4, of profile (wihou ple flnge) h w w 4 for fl brs (slbs) f h ww f for flnged profiles polr momen of ineri, in cm 4, of profile bou connecion of siffener o ple h w w 4 for fl brs (slbs) 4 hw w + hw f for flnged profiles secoril momen of ineri, in cm 6, of profile bou connecion of siffener o ple h w w 6 6 for fl brs (slbs) f hw 6 1 for Tee profiles hw 6 [ ( ) + ] f hw hw w hw for ngles nd bulb profiles 1( b + h ) f w h w web heigh, in mm w web hickness, in mm, considering sndrd deducions s specified in b f flnge widh, in mm f flnge hickness, in mm, considering sndrd deducions s specified in or bulb profiles he men hickness of he bulb my be used. l spn of profile, in m s spcing of profiles, in m C spring siffness exered by supporing ple p kp p 1. k 1 + phw p s 00 sw kp 1 ηp no o be ken less hn zero p ple hickness, in mm, considering sndrd deducions s specified in η p p Pge of 1 ACS Req. 1989/Rev.8 015

11 clculed compressive sress. or longiudinls, see elsic buckling sress of supporing ple s clculed in.5..1 p or flnged profiles, k p need no be ken less hn Web nd flnge buckling or web ple of longiudinls he idel elsic buckling sress is given by:.8 w (N/mm ) hw or flnges on ngles nd T-secions of longiudinls, buckling is ken cre of by he following requiremen: f 15 b f flnge widh, in mm, for ngles, hlf he flnge widh for T-secions. f s buil flnge hickness..5. Criicl buckling sresses.5..1 Compression The criicl buckling sress in compression c is deermined s follows: c when 1 when > 4 yield sress of meril, in N/mm. my be ken s 5 N/mm for mild seel. idel elsic buckling sress clculed ccording o Sher The criicl buckling sress in sher c is deermined s follows: c when 1 when > 4 s given in idel elsic buckling sress in sher clculed ccording o Pge 11 of 1 ACS Req. 1989/Rev.8 015

12 .5.4 Working sress Longiudinl compressive sresses The compressive sresses re given in he following formul: M + M s w 5 y N/mm n minimum k 0 M s sill wer bending momen (kn.m), s given in..1 M w wve bending momen (kn.m) s given in...1 n momen of ineri, in cm 4, of he hull girder y vericl disnce, in m, from neurl xis o considered poin k s specified in..1.1 (i) M s nd M w re o be ken s sgging or hogging bending momens, respecively, for members bove or below he neurl xis. Where he ship is lwys in hogging condiion in sill wer, he sgging bending momen (M s + M w ) is o be specilly considered Sher sresses 1. Ships wihou effecive longiudinl bulkheds or side shell 0.5 S s w N/mm + s, w,, S, s specified in.4... Ships wih wo effecive longiudinl bulkheds or side shell ( 0.5 φ)( s + w ) + sh S N/mm or longiudinl bulkheds ( s + w ) + bl S φ N/mm s, w, Δ sh, Δ bl,, S, s specified in.4.. Pge 1 of 1 ACS Req. 1989/Rev.8 015

13 .5.5 Scnling crieri Buckling Sress The design buckling sress c of ple pnels nd longiudinls (s clculed in.5..1) is no o be less hn: c β β 1 for pling nd for web pling of siffeners (locl buckling) β 1.1 for siffeners The criicl buckling sress c of ple pnels (s clculed in.5..) is no o be less hn: c nd of Documen Pge 1 of 1 ACS Req. 1989/Rev.8 015

Longitudinal Strength Standard. S11 (cont) S11

Longitudinal Strength Standard. S11 (cont) S11 (1989) (Rev.1 199) (Rev. Nov 001) (Rev. June 00) (Rev.4 July 004) (Rev.5 Jn 006) (Rev.6 My 0) Longiudinl Srengh Sndrd.1 Applicion This requiremen pplies only o seel ships of lengh 90 m nd greer in unresriced