Performance prediction of eccentrically loaded RC columns wrapped with FRP
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1 Fourt Intrnational Conrn on FR Compoit in Civil Enginring (CICE008-4Jul 008, Zuri, Switzrlan rorman prition o ntriall loa RC olumn wrapp wit FR T. El Maaaw Unit rab Emirat Univrit, l-in, bu Dabi, Unit rab Emirat BSTRCT: Ti papr prnt an analtial mol or prorman prition o ntriall loa rinor onrt (RC olumn wrapp wit xtrnall bon ibr rinor polmr (FR. T propo mol i ba on raliti matrial law, an aount or t ang in gomtr au b t latral ormation unr ntri loaing. It alo tak into oniration t oninmnt t au b FR wrapping tm at variou loa ntriiti. n xprimntal program wa arri out to xamin t mol aura. Tt paramtr inlu t oninmnt onition (No wrapping, ull FR-wrapping, an partial FRwrapping, an t ntriit-to-tion igt (/ ratio (0.3, 0.43, 0.57, an Rar ining iniat tat t trngt gain au b FR wrapping tm wa invrl proportional to t ntriit ratio. omparion btwn t analtial an t xprimntal rult a montrat t mol aura an valiit. INTRODUCTION larg numbr o xiting RC inratrutur in vlop ountri ar uring rom itr u to ovru an/or inaquat maintnan. Strutural trngtning i an onomial olution, an n rquntl rquir to xtn t untional rvi liv o iint RC trutur. ltoug rinor onrt an grout-injt tl jakting tm ar tiv in inraing t trutural apait, t ar labor onuming an omtim iiult to implmnt on it. Hn, an innovativ, urabl, a-to-intall, an ot tiv trngtning tm, u a xtrnall bon ibr rinor polmr (FR, i ntiall rquir to rpla outat trngtning tniqu. Numrou analtial mol av bn vlop to prit t trngt o onntriall loa RC olumn wrapp wit FR (Tng t al. 00. In pratial ituation, RC olumn ar otn, owvr, xpo to ombin lxural an axial loaing. T train graint au b an ntri loaing rult in a non-uniorm onining prur wi woul ru t iin o t FR wrapping tm (Caallal & Saawa 000; arvin & Wang 00. For ntriall loa RC olumn, t onar momnt au b t - t woul rult in ruing t loa arring apait, an n aount oul b takn o t ang in gomtr au b t latral ormation. T prnt rar i tn initiat to vlop a impl, t aurat, analtial mol tat an prit t trngt o ntriall loa RC olumn wrapp wit FR. n xprimntal tu wa unrtakn to xamin t mol aura an valiit. MODEL DEVELOMENT. Matrial law Matrial ontitutiv mol u in t prnt tu ar own in Figur. T tr-train rlationip o an unonin onrt in omprion i rib b a paraboli rlationip. - -
2 = ( ( o o Wr = onrt omprion tr, = onrt omprion trngt, = onrt train, an o = onrt train orrponing to. T tr-train mol o an FR-onin onrt i ivi into two portion. T propo mol aum tat t aning bran o t urv, btwn zro tr an a tr qual to, i paraboli imilar to tat o t unonin onrt (Samaan t al. 998; Fam t al Bon, t onrt tr i aum to inra linarl until it ra t onin trngt o t onrt (Mirmiran t al. 999; Tng t al. 00. Ba on xtniv rar (Tng t al. 00, t trngt an orrponing ultimat ompriv train o an FR-onin onrt unr onntri loaing, o an u, rptivl, ar givn b: l o = ( ( l u = o(.75 0 (3 o FR-onin onrt ( = FR-onin onrt ( = 0 u E p unonin onrt E u o Conrt Figur. Matrial mol u Stl rinormnt Exprimntal tt rult ow tat t gain in t ultimat ompriv train au b FR wa invrl proportional to t ntriit ratio (El Maaaw 008. Som rarr alo rport an invr rlationip btwn t onin trngt an t ntriit ratio (Fam t al oringl t trngt an ultimat train o t onrt unr ntri loaing, an, rptivl, ar onrvativl aum to b pnnt on / a ollow: = ( o ( (4 / = u ( u u ( (5 / u l rt = k ( b (6 k ( b R ( R = [ ρ ]/( ρ (7 3 g Wr l = t tiv latral onining prur provi b FR, u = ultimat ompriv tain o an unonin onrt, k = ap ator, r = ruptur trngt o FR, t = tiv tikn o FR (t = t in a o ull wrapping an t = t w /S in a o partial wrap- - -
3 ping, t = tikn o FR, w = wit o an FR trip, S = ntr-to-ntr paing btwn FR trip, R = raiu o t olumn ornr, b = wit o tion, = igt o tion, = loa ntriit, g = gro ara o t tion, an ρ = tl ratio. T tr-train rlationip o tl i ializ to b linar lati-plati wit a pot-il train arning o %.. Compatibilit an quilibrium rquirmnt T train an tr itribution or unonin an FR-onin onrt ar own in Figur a an b, rptivl. T tional urvatur,φ, i tn givn b:, max φ = (8 Wr,max = train at t xtrm omprion ibr, an = pt o t nutral axi. t ailur,,max = u or an unonin onrt wil or a onin onrt,max =. Equilibrium onition i impo in trm o axial or, n, an bning momnt, M n : b b t = α β n (9 b b( ( t ( = ( α β M n (0 ( α β = ( β ( α β ( 3( ( Wr α an β = tr blok ator (Collin an Mitll 987, = igt o t paraboli portion o t onrt tr itribution, = igt o t trapzoial portion o t onrt tr itribution, = itan btwn t xtrm omprion ibr an t rultant omprion or in onrt, = ara o omprion tl, = tr in omprion tl, = ara o tnion tl, an = tr in tnion tl.,max = u N. = α β t b (a =,max o N. α β t b Cro tion Strain itribution (b tual onrt tr itribution Equivalnt onrt tr itribution Figur. Strain an tr itribution - 3 -
4 .3 Latral mi-igt iplamnt T momnt, urvatur an ormation o an RC olumn unr ntri loaing ar own in Figur 3. T latral mi-igt ltion,, an b rlat to t mi-igt urvatur, φ, an t total lngt o t olumn, L, a ollow: φl = ( k T momnt o inrtia o a n orbl in t prnt tu wa 6 tim t inrtia o t olumn tion in t tt rgion, an n it an b aum tat k =..4 Moling prour T moling prour an b ummariz a ollow: For a givn /, u t unorm gomtr to trmin t tional or an urvatur at mi-igt o t olumn. U t mi-igt tional urvatur to alulat t latral mi-igt ltion. Moi t initial / to aount or t latral mi-igt ltion. U t moii / to ralulat t tional or an urvatur at t mi-igt. Rturn to tp i tr i a igniiant ang in t tional or. M = 0.9 L k = 4.8 L = 00 mm 0.4 L? M = ( M = (? φ k = L Unorm ap Dorm ap Momnt Curvatur Figur 3. Dorm ap an orrponing momnt an urvatur 3 MODEL VERIFICTION n xprimntal program wa arri out to xamin t mol aura. Dtail o tt pimn ar givn in Figur 4. total o twlv pimn wr tt. Tt paramtr inlu t oninmnt onition (No wrapping, ull FR-wrapping, an partial FR-wrapping wit w /S = 0.6, an t ntriit ratio (0.3, 0.43, 0.57, an T onrt trngt wa 8.5 Ma wra t longituinal tl a il an ultimat trngt o 550 an 75 Ma, rptivl. ur arbon ibr rinor polmr (CFR ompoit laminat u in t prnt tu a a tikn o 0.38 mm, a tnil trngt o 894 Ma, a tnil moulu o 65.4 Ga, an an ultimat longation o.33 % (inormation wa xtrat rom t manuaturr ata t. T olumn ornr wr roun to a raiu o about 0 mm
5 No. 70 mm No. 0 No. 0 No No. 4 B B x x No. 0 Long. bar Stainl tl tub Clar ovr o 5 mm Stion (B-B 5 Ø6 ti Stion (- 5 No No (ll im. ar in mm Figur 4. Spimn tail (all imnion ar in mm Exprimntal naltial Comprion trngt (kn No Wrapping Full FR-Wrapping artial FR-Wrapping Entriit ratio (/ Figur 5. naltial an xprimntal rult omparion btwn t analtial an t xprimntal rult ar givn in Figur 5. It an b n tat t trngt gain au b CFR wrapping ra a t ntriit ratio wa inra. On lar o ull CFR-wrapping rult in about 37 % trngt gain at a nominal / o 0.3 wra onl 3 % trngt gain wa ror at a nominal / o ll prit rult wr witin % rror ban wi onirm t abilit o t propo mol to auratl prit t trngt o unwrapp an FR-wrapp RC olumn unr ntri loaing. Figur 6 ow tpial intration urv or a quar olumn aving am ro tional imnion, tl rinormnt an matrial proprti a to o t pimn u in t prnt tu. Tr irnt wrapping m wr onir. T olumn wa itr ull wrapp wit on or two lar o CFR, or partiall wrapp wit on lar o CFR trip aving a lar paing lar = w. In t urv t olumn trngt unr onntri loaing, no, i prit b: 0.85 ( g t t o or unwrapp - olumn = (3 no o( g t t or CFR - wrapp olumn - 5 -
6 Wr t = total ara o tl, o = tl tr orrponing to a tl train o o, an = tl tr orrponing to a tl train o u but not gratr tan t tl ultimat tr. It i vint tat t trngt gain inra wit t amount o CFR. T CFR wrapping a a mor pronoun t on t trngt gain wn a omprion mo ailur i ominat. xila loa (kn No-wrapping artial-wrapping ( lar = w Full-wrapping ( lar Full-wrapping ( lar Bning momnt (kn.m Figur 6. Tpial intration urv 4 CONCLUSIONS n analtial mol tat an prit t trngt o ntriall loa RC olumn wrapp wit FR wa vlop an vrii againt tt rult. T mol aount or t oninmnt t o FR wrapping an t ang in gomtr au b t latral ormation unr ntri loaing. Rar ining iniat tat t trngt gain au b FR ra a t ntriit ratio i inra. CKNOWLEDGMENTS T autor woul lik to xpr i appriation to t Rar air at t UE-Univrit or t inanial upport o ti projt unr un grant # /06. REFERENCES Caallal, O., an Saaw, M rorman o ibr-rinor polmr-wrapp rinor onrt olumn unr ombin axial-lxural loaing. CI Strutural Journal, 97(4, Collin, M.., an Mitll, D rtr Conrt Bai. Canaian rtr Conrt Intitut (CCI, Ottawa, ON, Canaa. El Maaaw, T Bavior o orroion-amag RC olumn wrapp wit FR unr ombin lxural an axial loaing. Journal o Cmnt an Conrt Compoit, in pr. Fam,., Fliak, B., an Rizkalla, S Exprimntal an analtial moling o onrt-ill ibrrinor polmr tub ubjt to ombin bning an axial loa. CI Strutural Journal, 00(4, Mirmiran,., Saaw, M., an Samaan, M Strngt an utilit o bri FR-onrt bamolumn. Journal o Strutural Enginring-SCE, 5(0, arvin,., an Wang, W. 00. Bavior o FR jakt onrt olumn unr ntri loaing. Journal o Compoit or Contrution-SCE, 5(3, Samaan, M., Mirmiran,., an Saaw, M Mol o onrt onin b ibr ompoit. Journal o Strutural Enginring-SCE, 4(9, Tng, J., Cn, J., Smit, S., an Lam, L. 00. FR-trngtn RC Strutur, Jon Wil & Son Lt., Englan, 66 pp
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