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Qhia ib lub carousel ntawm peb slides ib zaug.Siv cov nyees khawm dhau los thiab Tom ntej kom txav mus los ntawm peb qhov swb ib zaug, lossis siv cov khawm slider thaum kawg kom txav mus los ntawm peb qhov swb ib zaug.
Plaub cov roj hmab pob zeb steel yeeb nkab (RuCFST) cov ntsiab lus, ib qho khoom siv hlau yeeb nkab (CFST) thiab ib qho khoob khoob tau raug sim nyob rau hauv cov kev kho kom huv huv.Lub ntsiab tsis yog shear ratio (λ) los ntawm 3 mus rau 5 thiab roj hmab hloov piv (r) los ntawm 10% mus rau 20%.Ib qho dabtsi yog khoov lub sij hawm-strain nkhaus, khoov lub sij hawm-deflection nkhaus, thiab ib tug dabtsi yog khoov lub sij hawm-curvature nkhaus yog tau.Hom kev puas tsuaj ntawm cov pob zeb nrog cov roj hmab core tau soj ntsuam.Cov txiaj ntsig tau pom tias hom kev ua tsis tiav ntawm cov tswv cuab RuCFST yog khoov tsis ua haujlwm.Cov kab nrib pleb hauv cov khoom siv roj hmab tau muab faib sib npaug thiab sib npaug, thiab sau cov pob zeb tseem ceeb nrog roj hmab tiv thaiv kev txhim kho ntawm cov kab nrib pleb.Qhov sib piv ntawm shear-rau-span tsis tshua muaj kev cuam tshuam rau tus cwj pwm ntawm cov qauv kuaj.Cov roj hmab hloov pauv tsis tshua muaj txiaj ntsig rau lub peev xwm tiv taus lub sijhawm khoov, tab sis muaj qee yam cuam tshuam rau kev khoov nruj ntawm cov qauv.Tom qab sau nrog roj hmab pob zeb, piv nrog cov qauv ntawm cov yeeb nkab tsis muaj steel, lub peev xwm khoov thiab khoov khov kho tau zoo tuaj.
Vim lawv qhov kev ua tau zoo seismic thiab muaj peev xwm ua tau zoo, cov qauv siv pob zeb ua vaj tse (CFST) tau siv dav hauv kev ua haujlwm niaj hnub no 1,2,3.Raws li hom tshiab ntawm cov roj hmab pob zeb, cov khoom siv roj hmab yog siv los hloov cov khoom sib xyaw ua ke.Rubber Concrete Filled Steel Pipe (RuCFST) cov qauv yog tsim los ntawm kev sau cov kav hlau nrog cov roj hmab pob zeb txhawm rau ua kom cov ductility thiab lub zog ua haujlwm ntawm cov qauv sib xyaw 4.Nws tsis tsuas yog siv qhov zoo ntawm kev ua tau zoo ntawm CFST cov tswv cuab, tab sis kuj ua rau kev siv roj hmab pov tseg kom zoo, uas ua tau raws li cov kev xav tau ntawm kev lag luam ntsuab ncig 5,6.
Ob peb xyoos dhau los, tus cwj pwm ntawm cov tswv cuab CFST ib txwm muaj nyob rau hauv axial load7,8, axial load-moment interaction9,10,11 thiab ntshiab dabtsi yog khoov12,13,14 tau kawm ntau ntxiv.Cov txiaj ntsig tau pom tias muaj peev xwm khoov, txhav, ductility thiab lub zog dissipation muaj peev xwm ntawm CFST kab thiab kab teeb tau txhim kho los ntawm kev ua vaj tse sab hauv thiab qhia cov pob txha zoo.
Tam sim no, qee cov kws tshawb fawb tau kawm txog tus cwj pwm thiab kev ua tau zoo ntawm RuCFST kab hauv qab ua ke axial loads.Liu thiab Liang15 tau ua ntau qhov kev sim ntawm luv luv RuCFST txhua, thiab piv nrog CFST txhua, cov kabmob muaj peev xwm thiab tawv tawv tau txo qis nrog kev hloov roj hmab thiab cov roj hmab particle loj, thaum ductility nce.Duarte4,16 tau sim ob peb luv luv RuCFST kab thiab pom tias RuCFST kab muaj ntau dua ductile nrog nce cov ntsiab lus roj hmab.Liang17 thiab Gao18 kuj tau tshaj tawm cov txiaj ntsig zoo sib xws ntawm cov khoom ntawm du thiab nyias-walled RuCFST plugs.Gu et al.19 thiab Jiang et al.20 tau kawm txog cov kabmob muaj peev xwm ntawm RuCFST cov ntsiab lus ntawm qhov kub thiab txias.Cov txiaj ntsig tau pom tias qhov sib ntxiv ntawm cov roj hmab nce qhov ductility ntawm cov qauv.Raws li qhov kub nce siab, lub peev xwm ntawm cov kabmob pib qis me ntsis.Patel21 tau soj ntsuam cov kev coj tus cwj pwm compressive thiab flexural ntawm luv CFST beams thiab txhua kab nrog puag ncig xaus nyob rau hauv axial thiab uniaxial loading.Kev ua qauv piv txwv thiab kev ntsuas parametric qhia tau tias cov tswv yim simulation fiber ntau tuaj yeem kuaj xyuas qhov ua tau zoo ntawm RCFSTs luv luv.Flexibility nce nrog nam piv, lub zog ntawm steel thiab pob zeb, thiab txo nrog qhov tob rau thickness ratio.Feem ntau, luv luv RuCFST txhua tus coj zoo ib yam li CFST txhua thiab muaj ntau dua li CFST kab.
Nws tuaj yeem pom los ntawm qhov kev tshuaj xyuas saum toj no uas RuCFST kab txhim kho tom qab siv cov roj hmab ntxiv rau hauv cov pob zeb ntawm CFST txhua.Txij li thaum tsis muaj axial load, net dabtsi yog khoov tshwm sim ntawm ib kawg ntawm kab kab.Qhov tseeb, cov yam ntxwv khoov ntawm RuCFST yog ywj siab ntawm axial load yam ntxwv22.Hauv kev tsim kho vaj tse, RuCFST cov qauv feem ntau raug khoov lub sijhawm thauj khoom.Txoj kev kawm ntawm nws cov ntshiab dabtsi yog khoov pab txiav txim qhov deformation thiab tsis ua hauj lwm hom ntawm RuCFST cov ntsiab lus nyob rau hauv seismic action23.Rau RuCFST cov qauv, nws yog ib qho tsim nyog los kawm txog cov khoom siv khoov ntshiab ntawm RuCFST cov ntsiab lus.
Hauv qhov no, rau qhov qauv raug sim los kawm txog cov khoom siv kho tshuab ntawm cov hlau uas ua kom zoo nkauj square yeeb nkab ntsiab lus.Cov seem ntawm tsab xov xwm no tau teeb tsa raws li hauv qab no.Ua ntej, 6 square-section specimens nrog lossis tsis muaj roj hmab sau tau raug sim.Saib xyuas hom tsis ua hauj lwm ntawm txhua tus qauv rau kev xeem.Qhov thib ob, qhov kev ua tau zoo ntawm RuCFST cov ntsiab lus hauv kev khoov ntshiab tau txheeb xyuas, thiab cov txiaj ntsig ntawm qhov sib piv ntawm 3-5 thiab cov roj hmab hloov pauv ntawm 10-20% ntawm cov qauv ntawm RuCFST tau tham txog.Thaum kawg, qhov sib txawv ntawm cov kabmob muaj peev xwm thiab khoov khov kho ntawm RuCFST cov ntsiab lus thiab cov khoom CFST ib txwm raug muab piv.
Rau CFST cov qauv ua tiav, plaub ntim nrog cov pob zeb ua pob zeb, ib qho puv nrog cov pob zeb qub, thiab thib rau yog khoob.Cov teebmeem ntawm roj hmab hloov pauv tus nqi (r) thiab span shear ratio (λ) tau tham.Qhov tseem ceeb ntawm cov qauv yog muab nyob rau hauv Table 1. Tsab ntawv t qhia txog cov yeeb nkab thickness, B yog qhov ntev ntawm sab ntawm cov qauv, L yog qhov siab ntawm cov qauv, Mue yog qhov ntsuas bending peev, Kie yog thawj zaug. dabtsi yog khoov txhav, Kse yog dabtsi yog khoov nruj hauv kev pabcuam.scene.
Cov qauv RuCFST tau tsim los ntawm plaub daim hlau welded ua khub los ua ib lub hollow square steel raj, uas tom qab ntawd tau ntim nrog pob zeb.Lub 10 hli tuab steel phaj yog welded rau txhua qhov kawg ntawm cov qauv.Cov khoom siv kho tshuab ntawm cov hlau tau qhia hauv Table 2. Raws li Suav tus qauv GB / T228-201024, lub zog tensile (fu) thiab yield zog (fy) ntawm cov yeeb nkab steel yog txiav txim siab los ntawm tus qauv tensile xeem txoj kev.Qhov ntsuas ntsuas yog 260 MPa thiab 350 MPa raws.Modulus ntawm elasticity (Es) yog 176 GPa, thiab Poisson tus piv (ν) ntawm hlau yog 0.3.
Thaum lub sij hawm sim, lub cubic compressive zog (fcu) ntawm cov ntaub ntawv siv pob zeb rau hnub 28 yog xam ntawm 40 MPa.Qhov sib piv 3, 4 thiab 5 tau raug xaiv raws li kev siv yav dhau los 25 vim qhov no yuav qhia tau tias muaj teeb meem nrog kev hloov pauv.Ob lub roj hmab hloov pauv ntawm 10% thiab 20% hloov cov xuab zeb hauv cov pob zeb sib tov.Nyob rau hauv txoj kev tshawb no, cov pa roj hmab roj hmab hmoov los ntawm Tianyu Cement Cog (Tianyu hom hauv Suav teb) tau siv.Qhov luaj li cas ntawm cov roj hmab yog 1-2 hli.Table 3 qhia qhov piv ntawm cov roj hmab pob zeb thiab cov khoom sib tov.Rau txhua hom roj hmab pob zeb, peb lub voos xwmfab nrog ib sab ntawm 150 mm raug muab pov tseg thiab kho raws li kev sim ntsuas los ntawm cov qauv.Cov xuab zeb siv nyob rau hauv qhov sib tov yog siliceous xuab zeb thiab coarse aggregate yog carbonate pob zeb nyob rau hauv Shenyang City, Northeast Tuam Tshoj.Lub 28-hnub cubic compressive zog (fcu), prismatic compressive zog (fc') thiab modulus ntawm elasticity (Ec) rau ntau yam roj hmab hloov ratios (10% thiab 20%) yog qhia nyob rau hauv Table 3. Ua raws li tus qauv GB50081-201926.
Tag nrho cov qauv kuaj tau raug kuaj nrog lub tog raj kheej hydraulic nrog lub zog ntawm 600 kN.Thaum lub sij hawm thauj khoom, ob lub zog muaj zog yog siv symmetrically rau plaub-point dabtsi yog khoov kuaj sawv ntsug thiab tom qab ntawd muab faib rau cov qauv.Deformation yog ntsuas los ntawm tsib hom ntsuas ntawm txhua qhov qauv.Kev sib txawv yog pom siv peb qhov kev hloov pauv hloov pauv tau pom hauv daim duab 1 thiab 2. 1 thiab 2.
Qhov kev ntsuam xyuas tau siv lub preload system.Load ntawm ib tug ceev ntawm 2kN / s, ces nres ntawm ib tug load mus txog 10kN, xyuas seb lub cuab tam thiab load cell puas nyob rau hauv ib txwm ua hauj lwm.Nyob rau hauv lub elastic band, txhua qhov load increment siv rau tsawg tshaj li ib feem kaum ntawm lub siab tshaj plaws load.Thaum cov yeeb nkab steel hnav tawm, cov ntaub ntawv thov yog tsawg tshaj li ib feem kaum tsib ntawm qhov kwv yees qhov siab tshaj plaws.Tuav li ob feeb tom qab siv txhua theem load thaum lub sij hawm thauj khoom.Raws li tus qauv mus txog qhov tsis ua haujlwm, tus nqi ntawm kev thauj khoom tas mus li qeeb.Thaum lub axial load ncav cuag tsawg dua 50% ntawm qhov kawg load los yog pom kev puas tsuaj nyob rau hauv cov qauv, lub loading yog txiav.
Kev puas tsuaj ntawm tag nrho cov qauv kuaj pom tau zoo ductility.Tsis muaj qhov pom tseeb tensile tawg tau pom nyob rau hauv thaj tsam tensile ntawm cov yeeb nkab steel ntawm cov khoom xeem.Hom kev puas tsuaj rau cov kav hlau steel tau qhia hauv daim duab.3. Siv cov qauv SB1 ua piv txwv, thaum pib ntawm kev thauj khoom thaum lub sijhawm khoov qis dua 18 kN m, qauv SB1 yog nyob rau theem elastic yam tsis muaj qhov pom tseeb deformation, thiab tus nqi nce ntawm qhov ntsuas lub sijhawm khoov yog ntau dua. tus nqi nce nyob rau hauv curvature.Tom qab ntawd, cov yeeb nkab steel hauv thaj tsam tensile yog deformable thiab dhau mus rau theem elastic-yas.Thaum lub sijhawm dabtsi yog khoov mus txog 26 kNm, qhov chaw compression ntawm cov hlau nruab nrab pib nthuav dav.Edema tsim maj mam thaum lub load nce.Lub load-deflection nkhaus tsis txo kom txog thaum lub load mus txog nws qhov chaw siab tshaj.
Tom qab qhov kev sim ua tiav, cov qauv SB1 (RuCFST) thiab cov qauv SB5 (CFST) raug txiav kom pom tseeb dua qhov tsis ua haujlwm ntawm lub hauv paus pob zeb, raws li qhia hauv daim duab 4. Nws tuaj yeem pom los ntawm daim duab 4 tias cov kab nrib pleb hauv cov qauv. SB1 raug faib sib npaug thiab sib cais hauv lub hauv paus pob zeb, thiab qhov kev ncua deb ntawm lawv yog los ntawm 10 mus rau 15 cm.Qhov kev ncua deb ntawm cov kab nrib pleb hauv cov qauv SB5 yog los ntawm 5 mus rau 8 cm, cov kab nrib pleb tsis sib xws thiab pom tseeb.Tsis tas li ntawd, cov kab nrib pleb hauv cov qauv SB5 txuas ntxiv txog 90 ° los ntawm qhov chaw nro mus rau thaj tsam compression thiab txhim kho txog li 3/4 ntawm qhov siab ntawm ntu.Cov pob zeb tseem ceeb hauv cov qauv SB1 yog me dua thiab tsis tshua muaj dua li hauv cov qauv SB5.Hloov cov xuab zeb nrog roj hmab tuaj yeem, rau qee yam, tiv thaiv kev txhim kho ntawm cov kab nrib pleb hauv pob zeb.
Ntawm daim duab.5 qhia txog kev faib cov deflection raws qhov ntev ntawm txhua qhov qauv.Cov kab khoom yog lub deflection nkhaus ntawm daim ntawv xeem thiab cov kab dotted yog lub sinusoidal ib nrab nthwv dej.Los ntawm fig.Daim duab 5 qhia tau hais tias tus pas nrig deflection nkhaus yog nyob rau hauv kev pom zoo nrog lub sinusoidal ib nrab-yoj nkhaus ntawm thawj loading.Raws li lub load nce, lub deflection nkhaus deviates me ntsis ntawm lub sinusoidal ib nrab-yoj nkhaus.Raws li txoj cai, thaum lub sij hawm thauj khoom, lub deflection nkhaus ntawm tag nrho cov qauv ntawm txhua qhov ntsuas taw tes yog qhov sib npaug ib nrab-sinusoidal nkhaus.
Txij li thaum lub deflection ntawm RuCFST ntsiab nyob rau hauv ntshiab dabtsi yog khoov raws li ib tug sinusoidal ib nrab-yoj nkhaus, cov dabtsi yog khoov sib npaug yuav qhia tau hais tias:
Thaum qhov siab tshaj plaws fiber ntau yog 0.01, xav txog cov kev siv tiag tiag, lub sijhawm khoov zoo sib xws yog txiav txim siab raws li lub caij nyoog kawg ntawm lub sijhawm khoov lub peev xwm27.Qhov ntsuas qhov ntsuas lub sijhawm muaj peev xwm (Mue) yog li txiav txim siab yog qhia nyob rau hauv Table 1. Raws li qhov ntsuas qhov ntsuas lub sijhawm muaj peev xwm (Mue) thiab cov qauv (3) rau kev suav cov curvature (φ), M-φ nkhaus hauv daim duab 6 tuaj yeem ua tau. npaj.Rau M = 0.2Mue28, qhov pib txhav Kie suav hais tias yog qhov sib thooj shear dabtsi yog khoov khov.Thaum M = 0.6Mue, qhov khoov khov kho (Kse) ntawm theem ua haujlwm tau teeb tsa rau qhov sib thooj secant dabtsi yog khoov khov.
Nws tuaj yeem pom los ntawm lub sijhawm bending curvature nkhaus uas lub sijhawm khoov thiab curvature nce ho linearly hauv theem elastic.Tus nqi ntawm txoj kev loj hlob ntawm lub sijhawm khoov yog kom meej meej siab tshaj qhov curvature.Thaum lub sij hawm khoov M yog 0.2Mue, cov qauv mus txog rau theem elastic txwv.Raws li kev thauj khoom nce, tus qauv ua rau cov yas deformation thiab dhau mus rau theem elastoplastic.Nrog rau lub sijhawm khoov M sib npaug rau 0.7-0.8 Mue, cov yeeb nkab steel yuav raug deformed nyob rau hauv qhov nro thiab hauv cheeb tsam compression hloov.Nyob rau tib lub sijhawm, Mf nkhaus ntawm cov qauv pib tshwm sim nws tus kheej raws li qhov taw qhia inflection thiab loj hlob tsis-linearly, uas txhim kho kev sib xyaw ua ke ntawm cov yeeb nkab steel thiab cov roj hmab pob zeb.Thaum M yog sib npaug rau Mue, cov qauv nkag mus rau hauv cov yas hardening theem, nrog rau deflection thiab curvature ntawm cov qauv sai, thaum lub sij hawm khoov nce maj mam.
Ntawm daim duab.7 qhia curves ntawm dabtsi yog khoov lub sij hawm (M) piv rau strain (ε) rau txhua tus qauv.Lub sab sauv ntawm lub mid-span seem ntawm tus qauv yog nyob rau hauv compression, thiab sab qis yog nyob rau hauv nro.Cov ntsuas ntsuas ntsuas "1" thiab "2" nyob rau saum toj ntawm daim ntawv xeem, cov ntsuas ntsuas ntsuas "3" nyob rau hauv nruab nrab ntawm cov qauv, thiab cov ntsuas ntsuas ntsuas "4" thiab "5".” nyob rau hauv cov qauv xeem.Qhov qis dua ntawm cov qauv qhia hauv daim duab 2. Los ntawm daim duab 7 nws tuaj yeem pom tias thaum pib ntawm kev thauj khoom, qhov ntev deformations nyob rau hauv qhov nro thiab hauv cheeb tsam compression ntawm lub caij yog ze heev, thiab cov deformations yog kwv yees li linear.Nyob rau hauv nruab nrab ib feem, muaj ib tug me ntsis nce longitudinal deformation, tab sis qhov loj ntawm qhov no nce yog me me.Tom qab, cov roj hmab pob zeb nyob rau hauv lub nro cheeb tsam tawg.Vim hais tias cov steel yeeb nkab nyob rau hauv lub nro cheeb tsam tsuas yog yuav tsum tau tiv thaiv lub zog, thiab lub roj hmab pob zeb thiab steel yeeb nkab nyob rau hauv lub compression cheeb tsam dais lub load ua ke, lub deformation nyob rau hauv lub nro cheeb tsam ntawm lub caij yog ntau tshaj li lub deformation nyob rau hauv lub loads, lub deformations tshaj lub yield zog ntawm cov hlau, thiab cov yeeb nkab steel nkag mus lub elastoplastic theem.Qhov kev nce hauv cov qauv ntawm cov qauv tau nce siab dua li lub sijhawm khoov, thiab thaj chaw yas tau pib tsim mus rau tag nrho cov ntu ntu.
M-um nkhaus rau txhua tus qauv yog qhia hauv daim duab 8. Ntawm daim duab.8, txhua qhov M-um nkhaus ua raws li qhov sib txawv raws li cov tswv cuab CFST ib txwm muaj22,27.Nyob rau hauv txhua rooj plaub, M-um nkhaus qhia cov lus teb elastic nyob rau hauv thawj theem, ua raws li tus cwj pwm inelastic nrog txo qis, kom txog rau thaum lub sij hawm siab tshaj plaws bending tau maj mam mus txog.Txawm li cas los xij, vim muaj qhov ntsuas sib txawv, M-um nkhaus sib txawv me ntsis.Lub sijhawm deflection rau shear-rau-span piv ntawm 3 mus rau 5 yog qhia hauv daim duab.8 ib a.Qhov tso cai khoov muaj peev xwm ntawm tus qauv SB2 (shear factor λ = 4) yog 6.57% qis dua li ntawm cov qauv SB1 (λ = 5), thiab lub peev xwm los khoov lub sijhawm ntawm tus qauv SB3 (λ = 3) yog ntau dua li cov qauv SB2 (λ = 4) 3.76%.Feem ntau hais lus, raws li qhov sib piv shear-rau-span nce, qhov sib txawv ntawm qhov kev hloov pauv hauv lub sijhawm tso cai tsis pom tseeb.M-um nkhaus tsis zoo li cuam tshuam nrog qhov sib piv ntawm qhov sib piv.Qhov no yog raws li qhov Lu thiab Kennedy25 tau soj ntsuam rau CFST kab teeb nrog shear-rau-span piv li ntawm 1.03 txog 5.05.Ib qho laj thawj rau CFST cov tswv cuab yog qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm cov yeeb nkab steel thiab cov yeeb nkab steel yuav luag tib yam.
Los ntawm fig.8b qhia tau hais tias cov kabmob muaj peev xwm ntawm cov qauv SB4 (r = 10%) thiab SB1 (r = 20%) yog me ntsis siab dua lossis qis dua li cov qauv ib txwm muaj CFST SB5 (r = 0), thiab nce los ntawm 3.15 feem pua thiab txo los ntawm 1.57 feem pua.Txawm li cas los xij, qhov pib khoov khov kho (Kie) ntawm cov qauv SB4 thiab SB1 yog qhov siab dua li ntawm cov qauv SB5, uas yog 19.03% thiab 18.11%, feem.Lub bending stiffness (Kse) ntawm cov qauv SB4 thiab SB1 nyob rau hauv lub lag luam theem yog 8.16% thiab 7.53% siab dua li cov qauv SB5, feem.Lawv qhia tau hais tias tus nqi ntawm cov roj hmab hloov tau me ntsis cuam tshuam rau lub peev xwm dabtsi yog khoov, tab sis muaj kev cuam tshuam loj ntawm kev khoov nruj ntawm cov qauv RuCFST.Qhov no tej zaum yuav yog vim lub fact tias cov plasticity ntawm cov roj hmab pob zeb nyob rau hauv cov qauv RuCFST yog siab tshaj cov plasticity ntawm natural pob zeb nyob rau hauv cov pa CFST qauv.Feem ntau, cracking thiab cracking nyob rau hauv tej yam ntuj tso pob zeb pib propagate ua ntej tshaj nyob rau hauv rubberized concrete29.Los ntawm hom tsis ua hauj lwm ntawm lub hauv paus pob zeb (Fig. 4), cov kab nrib pleb ntawm cov qauv SB5 (natural pob zeb) yog loj thiab denser dua li cov qauv SB1 (rubber qhob).Qhov no tuaj yeem ua rau muaj kev txwv ntau dua los ntawm cov kav hlau steel rau SB1 Reinforced Concrete qauv piv rau SB5 Natural Concrete qauv.Txoj kev tshawb fawb Durate16 kuj tau los rau cov lus xaus zoo sib xws.
Los ntawm fig.8c qhia tau hais tias RuCFST lub caij muaj peev xwm khoov tau zoo thiab ductility dua li cov hollow steel yeeb nkab caij.Lub zog dabtsi yog khoov ntawm cov qauv SB1 los ntawm RuCFST (r = 20%) yog 68.90% siab dua li cov qauv SB6 los ntawm cov yeeb nkab tsis muaj steel, thiab thawj zaug dabtsi yog khoov tawv (Kie) thiab dabtsi yog khoov nruj ntawm theem ntawm kev ua haujlwm (Kse) ntawm cov qauv SB1 yog 40.52% feem., uas yog siab dua tus qauv SB6, yog 16.88% siab dua.Kev sib xyaw ua ke ntawm cov yeeb nkab steel thiab cov tub ntxhais rubberized pob zeb ua rau kom muaj peev xwm ua tau zoo thiab nruj ntawm cov khoom sib xyaw.RuCFST cov ntsiab lus nthuav tawm cov qauv zoo ductility thaum raug cov khoom siv khoov ntshiab.
Lub sijhawm khoov tau muab piv nrog lub sijhawm khoov tau teev tseg hauv cov qauv tsim qauv tam sim no xws li Japanese cov cai AIJ (2008) 30, British txoj cai BS5400 (2005) 31, European txoj cai EC4 (2005) 32 thiab Suav txoj cai GB50936 (2014) 33. dabtsi yog khoov lub sijhawm (Muc) rau lub sijhawm sim khoov (Mue) tau muab rau hauv Table 4 thiab nthuav tawm hauv daim duab.9. Cov nqi suav ntawm AIJ (2008), BS5400 (2005) thiab GB50936 (2014) yog 19%, 13.2% thiab 19.4% qis dua qhov nruab nrab qhov kev sim, feem.Lub sijhawm dabtsi yog khoov xam los ntawm EC4 (2005) yog 7% qis dua qhov ntsuas nruab nrab, uas yog qhov ze tshaj plaws.
Cov cuab yeej cuab tam ntawm RuCFST cov ntsiab lus nyob rau hauv kev khoov ntshiab yog sim tshawb xyuas.Raws li kev tshawb fawb, cov lus xaus hauv qab no tuaj yeem kos tau.
Cov tswv cuab xeem ntawm RuCFST tau nthuav tawm tus cwj pwm zoo ib yam li cov qauv CFST ib txwm muaj.Nrog rau kev zam ntawm cov khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob
Lub shear rau span piv txawv ntawm 3 mus rau 5 nrog me ntsis cuam tshuam rau lub sijhawm sim thiab khoov nruj.Tus nqi ntawm cov roj hmab hloov tau xyaum tsis cuam tshuam rau qhov tsis kam ntawm cov qauv mus rau lub sijhawm khoov, tab sis nws muaj qee yam cuam tshuam rau kev khoov nruj ntawm cov qauv.Thawj qhov flexural txhav ntawm cov qauv SB1 nrog cov roj hmab hloov pauv ntawm 10% yog 19.03% siab dua li cov qauv CFST SB5.Eurocode EC4 (2005) tso cai rau kev ntsuam xyuas qhov tseeb ntawm qhov kawg khoov muaj peev xwm ntawm RuCFST cov ntsiab lus.Ntxiv cov roj hmab rau hauv lub hauv paus pob zeb txhim kho lub brittleness ntawm cov pob zeb, muab cov Confucian ntsiab zoo toughness.
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Post lub sij hawm: Jan-05-2023