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Zvina rabha kongiri simbi pombi (RuCFST) zvinhu, imwe kongiri simbi pombi (CFST) chinhu uye chinhu chimwe chisina chinhu vakaedzwa pasi yakachena kukotama mamiriro.Maparamendi makuru ndeeshear ratio (λ) kubva pa3 kusvika pa5 uye rubber replacement ratio (r) kubva pa10% kusvika pa20%.Iyo yekukotama nguva-yekudzvanya curve, inokotama nguva-inotenderera curve, uye inokotama nguva-curvature curve inowanikwa.Nzira yekuparadzwa kwekrete ine rubber core yakaongororwa.Zvigumisiro zvinoratidza kuti rudzi rwekukundikana kwenhengo dzeRuCFST ndiko kutadza kwebhendi.Mitswe murubha kongiri inogovaniswa zvakaenzana uye zvishoma, uye kuzadza kongiri yepakati nerabha kunodzivirira kukura kwekutsemuka.Iyo shear-to-span reshiyo yakanga ine mhedzisiro shoma pane maitiro eiyo test samples.Iyo rabha yekutsiva chiyero haina mhedzisiro pakukwanisa kutsungirira nguva yekukotama, asi ine imwe mhedzisiro pakukotama kuoma kwemuenzaniso.Mushure mekuzadza nerabha kongiri, zvichienzaniswa nemasampuli kubva kune isina chinhu pombi yesimbi, kugona kubhenda uye kuomarara kwekukotama kunovandudzwa.
Nekuda kwekuita kwavo kwakanaka kweseismic uye yakakwirira kubereka kugona, yechinyakare yakasimbiswa kongiri tubular zvimiro (CFST) inoshandiswa zvakanyanya muinjiniya yemazuva ano1,2,3.Serudzi rutsva rwekongiri yerabha, zvimedu zverabha zvinoshandiswa kutsiva zvisikwa zvakaunganidzwa.Rubber Concrete Yakazadzwa Simbi Pipe (RuCFST) zvimiro zvinoumbwa nekuzadza pombi dzesimbi nerabha kongiri kuti iwedzere ductility uye kushanda nesimba kweanosanganiswa zvimiro4.Haisi kungotora mukana wekuita kwakanakisa kwenhengo dzeCFST, asi zvakare inoshandisa zvinobudirira tsvina yerabha, iyo inosangana nezvinodiwa zvekusimudzira zvegirinhi denderedzwa economy5,6.
Mumakore mashoma apfuura, maitiro echinyakare nhengo dzeCFST pasi peaxial load7,8, axial load-moment interaction9,10,11 uye pure bending12,13,14 yakadzidzwa zvakanyanya.Mhedzisiro yacho inoratidza kuti kukotama kwesimba, kuomarara, ductility uye simba rekubvisa simba reCFST makoramu uye matanda anovandudzwa nemukati kongiri kuzadza uye kuratidza yakanaka kuputsika ductility.
Parizvino, vamwe vaongorori vakadzidza maitiro uye kuita kweRuCFST makoramu pasi peakasanganiswa axial mitoro.Liu naLiang15 vakaita ongororo dzakati wandei pamakoramu mapfupi eRuCFST, uye zvichienzaniswa nekoramu dzeCFST, kutakura uye kuomarara kwakadzikira nekuwedzera dhigirii rekutsiva rabha uye saizi yerabha, ukuwo ductility yakawedzera.Duarte4,16 yakaedza makoramu mapfupi eRuCFST uye yakaratidza kuti makoramu eRuCFST aive akawanda ductile nekuwedzera rubber content.Liang17 uye Gao18 yakashumawo mibairo yakafanana pane zvivakwa zvemapulagi akatsetseka uye akatetepa-akavakirwa RuCFST.Gu et al.19 naJiang et al.20 vakadzidza kukwanisa kwekutakura kwezvinhu zveRuCFST pakupisa kwepamusoro.Zvigumisiro zvakaratidza kuti kuwedzerwa kwerabha kwakawedzera ductility yechimiro.Sezvo tembiricha inokwira, simba rekutakura rinotanga kuderera zvishoma.Patel21 akaongorora maitiro ekumanikidza uye anochinja-chinja mapfupi eCFST matanda uye makoramu ane akatenderera magumo pasi peaxial uye uniaxial kurodha.Computational modeling uye parametric analysis inoratidza kuti fiber-based simulation mazano anogona kunyatsoongorora kushanda kweRCFSTs pfupi.Flexibility inowedzera nechiyero chechikamu, simba resimbi uye kongiri, uye inodzikira nekudzika kusvika kune ukobvu reshiyo.Kazhinji, makoramu mapfupi eRuCFST anoita zvakafanana kumakoramu eCFST uye ane ductile kupfuura makoramu eCFST.
Zvinogona kuonekwa kubva pakuongorora kwepamusoro kuti RuCFST columns inovandudza mushure mekushandiswa kwakakodzera kwerabha additives mubhesi rekrete reCFST columns.Sezvo pasina axial mutoro, kubhenda kwemambure kunoitika kune imwe mugumo wekoramu danda.Muchokwadi, maitiro ekukotama eRuCFST akazvimirira pane axial mutoro maitiro22.Muinjiniya inoshanda, zvimiro zveRuCFST zvinowanzoiswa pasi pekukotama mitoro yenguva.Kudzidza kwayo kwakachena kukotama zvimiro kunobatsira kuona deformation uye kukundikana modhi yeRuCFST zvinhu pasi pe seismic action23.Kune zvimiro zveRuCFST, zvinodikanwa kuti udzidze kubhenda kwakachena kwezvinhu zveRuCFST zvinhu.
Panyaya iyi, sampuli nhanhatu dzakaedzwa kuti dzidzidze macheneko ezvimiro zvesimbi zvakakombama sikweya pombi zvinhu.Chinyorwa ichi chasara chakarongwa sezvizvi.Chekutanga, zvitanhatu zvisere-chikamu zvienzaniso zvine kana zvisina rubha kuzadza zvakaedzwa.Tarisa maitiro ekukundikana kwemuenzaniso wega wega kune mhinduro dzebvunzo.Chechipiri, kushanda kwezvinhu zveRuCFST mukukotama kwakachena kwakaongororwa, uye mhedzisiro yeshear-to-span ratio ye3-5 uye rubber replacement ratio ye10-20% pazvimiro zveRuCFST zvakakurukurwa.Pakupedzisira, misiyano yekutakura mutoro uye kuomarara kwekukotama pakati peRuCFST zvinhu uye zvechinyakare CFST zvinhu zvinoenzaniswa.
Zviyero zvitanhatu zveCFST zvakapedzwa, zvina zvakazadzwa nekongiri yerabha, imwe yakazadzwa nekongiri yenguva dzose, uye yechitanhatu yakanga isina chinhu.Migumisiro yerabha shanduko yehuwandu (r) uye span shear ratio (λ) inokurukurwa.Iwo maparamendi makuru emuenzaniso anopiwa muTebhura 1. Vara t rinoratidza ukobvu hwepombi, B kureba kwedivi remuenzaniso, L kureba kwesample, Mue ndiko kuyerwa kwekukotama kugona, Kie ndiyo yekutanga. kukotama kuoma, Kse ndiko kukotama kuomarara mubasa.chiitiko.
Mucherechedzo weRuCFST wakagadzirwa kubva kumarata mana esimbi akasungwa ari maviri maviri kuti aite hollow square steel chubhu, iyo yakabva yazadzwa nekongiri.A 10 mm gobvu ndiro yesimbi inosungirirwa kumagumo ega ega emuenzaniso.Iyo mechanical properties yesimbi inoratidzwa muTebhu 2. Maererano neChinese standard GB / T228-201024, simba rekusimba (fu) uye simba rekubereka (fy) yepombi yesimbi inotsanangurwa neyakajairwa tensile test method.Mhedzisiro yebvunzo ndeye 260 MPa uye 350 MPa zvichiteerana.Iyo modulus ye elasticity (Es) ndeye 176 GPa, uye iyo Poisson's ratio (ν) yesimbi i0.3.
Panguva yekuyedza, iyo cubic compressive simba (fcu) yereferensi kongiri pazuva 28 yakaverengerwa pa40 MPa.Mareshiyo 3, 4 uye 5 akasarudzwa zvichibva pane yakapfuura referensi 25 sezvo izvi zvichigona kuratidza chero matambudziko nekuchinja kutapurirana.Rubber maviri ekutsiva mareti e10% ne20% anotsiva jecha mumusanganiswa wekongiri.Muchidzidzo ichi, zvakajairwa tayi rabha hupfu kubva kuTianyu Cement Plant (Tianyu brand kuChina) yakashandiswa.Hukuru hwerabha hunosvika 1-2 mm.Tafura 3 inoratidza chiyero cherubha kongiri uye musanganiswa.Pamhando imwe neimwe yekongiri yerabha, macube matatu ane rutivi rwe 150 mm akakandwa uye akaporeswa pasi pemamiriro ekuedzwa anotemerwa nezviyero.Jecha rinoshandiswa mumusanganiswa is siliceous jecha uye coarse aggregate is carbonate rock muShenyang City, Northeast China.The 28-day cubic compressive simba (fcu), prismatic compressive simba (fc') uye modulus of elasticity (Ec) nokuda siyana rabha kutsiva reshiyo (10% uye 20%) anoratidzwa Table 3. Shandisa iyo GB50081-201926 mwero.
Yese mienzaniso yebvunzo inoedzwa ne hydraulic cylinder ine simba re600 kN.Panguva yekurodha, mauto maviri akaiswa anoshandiswa symmetrically kune mana-point bending test stand uye ogovaniswa pamusoro pemuenzaniso.Deformation inoyerwa neshanu strain geji pane yega sampuli nzvimbo.Kutsauka kunocherechedzwa uchishandisa masensa matatu ekutamisa anoratidzwa muFigure 1 uye 2. 1 uye 2.
Muedzo wakashandisa preload system.Takura nekumhanya kwe2kN/s, wombomira pamutoro unosvika 10kN, tarisa kana chishandiso uye sero rekutakura zviri mumamiriro ekushanda.Mukati meiyo elastic bhendi, imwe neimwe yekuwedzera yemutoro inoshanda kune isingasviki chikamu chimwe mugumi chezvakafanotaurwa peak mutoro.Apo pombi yesimbi inopera, mutoro wakashandiswa uri pasi pechikamu chimwe chete neshanu chezvakafanotaurwa peak load.Bata kweanenge maminetsi maviri mushure mekushandisa yega yega nhanho panguva yekurodha.Sezvo muenzaniso unosvika pakukundikana, chiyero chekuenderera mberi kwekutakura chinodzikira.Kana iyo axial mutoro inosvika pasi pe50% yemutoro wekupedzisira kana kukuvadzwa kuri pachena kunowanikwa pamuenzaniso, kurodha kunogumiswa.
Kuparadzwa kweyese test samples kwakaratidza zvakanaka ductility.Hapana kutsemuka kuri pachena kwakatsemuka kwakawanikwa munzvimbo inorema yepombi yesimbi yechidimbu chekuyedza.Mhando dzemhando dzekukuvadzwa kwepombi dzesimbi dzinoratidzwa muonde.3. Kutora muenzaniso SB1 semuenzaniso, padanho rekutanga rekutakura kana nguva yekukotama isingasviki 18 kN m, sampuli SB1 iri mudanho re elastic pasina deformation iri pachena, uye chiyero chekuwedzera munguva yakayerwa yekukotama yakakura kupfuura. chiyero chekuwedzera kwe curvature.Pashure pacho, pombi yesimbi iri munzvimbo inorema inokamhina uye inopinda mune elastic-plastiki nhanho.Kana nguva yekukotama inosvika 26 kNm, iyo yekumanikidza nzvimbo yepakati-span simbi inotanga kuwedzera.Edema inokura zvishoma nezvishoma sezvo mutoro unowedzera.Iyo yekuremedza-yekudzoreredza curve haidzike kusvika mutoro wasvika panhongonya.
Mushure mokunge kuedza kwapera, sampuli SB1 (RuCFST) uye sampuli SB5 (CFST) yakatemwa kuti inyatsocherechedza kukundikana kwekrete yepasi, sezvinoratidzwa mumufananidzo 4. Inogona kuonekwa kubva mumufananidzo 4 kuti kuputika kwemuenzaniso. SB1 inogoverwa zvakaenzana uye zvishoma mubhesi kongiri, uye kureba pakati pavo kubva pa10 kusvika ku15 cm.Nharaunda pakati pekutsemuka mumuenzaniso SB5 inobva pa5 kusvika ku8 cm, kuputika hakusi kwemaitiro uye pachena.Pamusoro pezvo, kutsemuka kwemuenzaniso SB5 kunowedzera anenge 90 ° kubva kunzvimbo yekumanikidza kuenda kunzvimbo yekumanikidza uye inokura inosvika 3/4 yehupamhi hwechikamu.Iwo makuru kongiri anotsemuka mumuenzaniso SB1 idiki uye ishoma kupfuura mune muenzaniso SB5.Kutsiva jecha nerabha kunogona, kusvika pamwero wakati, kudzivirira kukura kwekutsemuka kwekongiri.
Pamusoro pemuonde.5 inoratidza kugoverwa kwekutsauka pamwe nehurefu hwemuenzaniso wega wega.Mutsara wakasimba ndiwo wekutsauka kwechimedu chekuyedza uye mutsara une doti ndiyo sinusoidal hafu wave.Kubva muonde.Mufananidzo 5 unoratidza kuti tsvimbo yekutsvedza curve iri muchibvumirano chakanaka ne sinusoidal hafu-wave curve pakurodha kwekutanga.Sezvo mutoro unowedzera, iyo deflection curve inotsauka zvishoma kubva kune sinusoidal hafu-wave curve.Sezvo mutemo, panguva yekurodha, kutsauswa ma curve eese masampuli pane imwe neimwe yekuyera nzvimbo ndeye symmetrical hafu-sinusoidal curve.
Sezvo kutsauka kwezvinhu zveRuCFST mukukotama kwakachena kunotevera sinusoidal hafu-wave curve, iyo yekukotama equation inogona kuratidzwa se:
Kana iyo yakanyanya fiber strain iri 0.01, uchifunga nezve chaiwo mamiriro ekushandisa, inoenderana nguva yekukotama inotemerwa sechinhu chekupedzisira kukotama nguva27.Iyo yakayerwa yekukotama nguva yekugona (Mue) saka yakatemwa inoratidzwa muTafura 1. Zvinoenderana neyakayerwa yekukotama nguva yekugona (Mue) uye formula (3) yekuverenga iyo curvature (φ), iyo M-φ curve muFigure 6 inogona vakaronga.Kune M = 0.2Mue28, iyo yekutanga kuomarara Kie inoonekwa seyanoenderana nekugera kukotama kuoma.Kana M = 0.6Mue, iyo yekukotama kuoma (Kse) yenhanho yekushanda yakaiswa kune inoenderana secant bending kuoma.
Izvo zvinogona kuoneka kubva panguva yekukotama curvature curve kuti nguva yekukotama uye curvature inowedzera zvakanyanya mutsetse mune elastic nhanho.Chiyero chekukura kwenguva yekukotama chiri pachena chakakwira kupfuura icho che curvature.Kana nguva yekukotama M iri 0.2Mue, mufananidzo wacho unosvika padanho rekutambirira.Sezvo mutoro unowedzera, sampu inopinda deformation yepurasitiki uye inopfuura muchikamu che elastoplastic.Nenguva yekukotama M yakaenzana ne 0.7-0.8 Mue, pombi yesimbi ichave yakaremara munzvimbo yekumanikidzana uye munzvimbo yekumanikidza neimwe nzira.Panguva imwecheteyo, iyo Mf curve yemuenzaniso inotanga kuzviratidza sechinhu chinoputika uye inokura isiri-mutsara, iyo inowedzera kusanganiswa kwepimbi yesimbi uye rubber concrete core.Kana M yakaenzana neMue, muenzaniso unopinda mupurasitiki yekuomesa nhanho, nekutsauka uye curvature yemuenzaniso unowedzera nokukurumidza, apo nguva yekukotama inowedzera zvishoma nezvishoma.
Pamusoro pemuonde.7 inoratidza macurves enguva yekukotama (M) maringe nekuita (ε) yemuenzaniso wega wega.Chikamu chepamusoro chepakati-span chikamu chemuenzaniso chiri pasi pekumanikidzwa, uye chikamu chepasi chiri pasi pekunetseka.Mageji ekusevha akanyorwa "1" uye "2" ari pamusoro pechidimbu chekuyedza, majeji ekusevha akaiswa "3" ari pakati pemuenzaniso, uye majeji emhando akaiswa "4" uye "5".” dziri pasi pebvunzo sampuli.Chikamu chezasi chemuenzaniso chinoratidzwa muFig. 2. Kubva mufananidzo 7 zvinogona kuonekwa kuti panguva yekutanga yekutakura, kureba kwekureba munzvimbo yekumanikidzika uye munzvimbo yekumanikidzika yechinhu chiri pedyo zvikuru, uye deformations dzinenge mutsara.Muchikamu chepakati, pane kuwedzera kuduku kwelongitudinal deformation, asi ukuru hwekuwedzera uku kuduku.Pashure pacho, kongiri yerabha munharaunda yekumanikidzika yakaputika.Nekuti pombi yesimbi munharaunda yekumanikidzika inoda chete kumira nesimba, uye iyo kongiri yerubha uye pombi yesimbi munzvimbo yekumanikidza inotakura mutoro pamwe chete, iyo deformation munzvimbo yekumanikidza yechinhu yakakura kupfuura deformation muiyo Sezvo mutoro unowedzera, deformations inodarika simba regoho resimbi, uye pombi yesimbi inopinda. the elastoplastic stage.Chiyero chekuwedzera kwehutachiwana hwemuenzaniso chakanga chakanyanya kukwirira kudarika nguva yekukotama, uye nzvimbo yepurasitiki yakatanga kukura kusvika kune yakazara chikamu chemuchinjikwa.
I-M-um curves yemuenzaniso wega wega inoratidzwa mumufananidzo 8. Pamuonde.8, ese maM-um macurves anotevera maitiro akafanana neaya echinyakare nhengo dzeCFST22,27.Muchiitiko chega chega, maM-um curves anoratidza mhinduro yakasununguka muchikamu chekutanga, inoteverwa neinelastic maitiro nekuderera kwekuoma, kusvikira iyo inobvumirwa nguva yekukotama yasvika zvishoma nezvishoma.Nekudaro, nekuda kweakasiyana bvunzo paramita, iwo M-um curves akasiyana zvishoma.Iyo nguva yekutsauka kweshear-to-span ratios kubva pa3 kusvika ku5 inoratidzwa mufig.8a.Iyo inotenderwa kupeta simba remuenzaniso SB2 (shear factor λ = 4) iri 6.57% yakaderera pane iyo yemuenzaniso SB1 (λ = 5), uye kugona kukotamisa nguva yemuenzaniso SB3 (λ = 3) yakakura kupfuura iyo yemuenzaniso SB2 (λ = 4) 3.76%.Kazhinji kutaura, sezvo shear-to-span ratio inowedzera, maitiro ekuchinja munguva inobvumirwa haasi pachena.Iyo M-um curve hairatidzike seine hukama neshear-to-span ratio.Izvi zvinoenderana nezvakacherechedzwa naLu naKennedy25 pamatanda eCFST ane shear-to-span ratios kubva pa1.03 kusvika 5.05.Chikonzero chinobvira chenhengo dzeCFST ndechekuti panguva dzakasiyana-siyana dzekugera reshiyo, simba rekutapurirana mashandiro pakati pekongiri musimboti nepombi dzesimbi rinenge rakafanana, risiri pachena senhengo dzekongiri dzakasimbiswa25.
Kubva muonde.8b inoratidza kuti kutakura masimba emasampuli SB4 (r = 10%) uye SB1 (r = 20%) yakakwira zvishoma kana yakaderera pane yemuenzaniso wechinyakare CFST SB5 (r = 0), uye yakawedzera ne3.15 muzana uye yakaderera 1 .57 muzana.Nekudaro, iyo yekutanga kukotama kuoma (Kie) yemasampuli SB4 uye SB1 yakanyanya kukwirira kupfuura iyo yemuenzaniso SB5, iyo iri 19.03% uye 18.11%, zvichiteerana.Kuomarara kwekukotama (Kse) yemasampuli SB4 uye SB1 muchikamu chekushanda i8.16% uye 7.53% yakakwirira kupfuura iyo yemuenzaniso SB5, zvichiteerana.Vanoratidza kuti chiyero cherubha chinotsiva chine mhedzisiro shoma pakukotama kugona, asi ine mhedzisiro yakakura pakukotama kuomarara kweiyo RuCFST mienzaniso.Izvi zvinogona kunge zvakakonzerwa nekuti purasitiki yekongiri yerubha muRuCFST sampuli yakakwirira kupfuura yepurasitiki yekongiri yechisikigo mumasampuli eCFST akajairwa.Kazhinji, kuputika uye kuputika mukongiri yechisikigo kunotanga kupararira kupfuura mukongiri yerubha29.Kubva pane yakajairwa kutadza maitiro ebhesi kongiri (Fig. 4), kutsemuka kwemuenzaniso SB5 (yakasikwa kongiri) yakakura uye yakaoma kupfuura iyo yemuenzaniso SB1 (rabha kongiri).Izvi zvinogona kupa kuzvidzora kwepamusoro kunopiwa nepombi dzesimbi dzeSB1 Reinforced Concrete sample kana ichienzaniswa neSB5 Natural Concrete sample.Chidzidzo cheDurate16 chakasvikawo pamhedzisiro dzakafanana.
Kubva muonde.8c inoratidza kuti chinhu cheRuCFST chine zvirinani kukotama uye ductility pane hollow simbi pombi chinhu.Simba rekukotama remuenzaniso SB1 kubva kuRuCFST (r=20%) iri 68.90% yakakwira kupfuura iyo yemuenzaniso SB6 kubva mupombi yesimbi isina chinhu, uye yekutanga kukotama kuoma (Kie) uye kupfugama kuoma padanho rekushanda (Kse) yemuenzaniso SB1. wakashanduka kusvika muna -40.52%., iyo yakakwirira kudarika sampuli SB6, yaiva 16.88% yakakwirira.Chiito chakabatanidzwa chepombi yesimbi uye rubberized concrete core inowedzera flexural capacity uye kuoma kwechinhu chinoumbwa.RuCFST zvinhu zvinoratidza yakanaka ductility samples kana ichiiswa kune yakachena kukotama mitoro.
Nguva dzekukotama dzinokonzeresa dzakafananidzwa nenguva dzekukotama dzakatsanangurwa mune zvazvino dhizaini semitemo yeJapan AIJ (2008) 30, mitemo yeBritish BS5400 (2005) 31, mitemo yeEuropean EC4 (2005) 32 uye Chinese mitemo GB50936 (2014) 33. (Muc) kune yekuyedza kukotama nguva (Mue) inopiwa muTafura 4 uye inoratidzwa mufig.9. Huwandu hwakaverengerwa hweAIJ (2008), BS5400 (2005) uye GB50936 (2014) i19%, 13.2% uye 19.4% yakaderera pane avhareji yemitengo yekuyedza, zvichiteerana.Nguva yekukotama yakaverengerwa neEC4 (2005) i7% pazasi peavhareji yebvunzo kukosha, inova iri padyo.
Iyo mechanic properties yeRuCFST zvinhu pasi pekukotama kwakachena zvinoongororwa.Kubva pane tsvakurudzo, mhedziso dzinotevera dzinogona kutorwa.
Nhengo dzakaedzwa dzeRuCFST dzakaratidza maitiro akafanana nemaitiro eCFST echinyakare.Kunze kwezviyereso zvepombi yesimbi isina chinhu, zvienzaniso zveRuCFST neCFST zvine ductility yakanaka nekuda kwekuzadzwa kwerubha kongiri nekongiri.
Iyo yeshear kune span reshiyo yakasiyana kubva pa3 kusvika pa5 ine zvishoma mhedzisiro panguva yakaedzwa uye kuomarara kwekukotama.Muyero wekutsiva rabha hauna mhedzisiro pakupokana kwesample kusvika pakukotama nguva, asi ine imwe mhedzisiro pakukotama kuomarara kwemuenzaniso.Kuomarara kwekutanga kwemuenzaniso SB1 ine rubber reshiyo reshiyo ye10% ndeye 19.03% yakakwira kupfuura iyo yechinyakare muenzaniso CFST SB5.Eurocode EC4 (2005) inobvumira kuongororwa kwakaringana kwekupedzisira kukotama kugona kweRuCFST zvinhu.Kuwedzerwa kwerabha kubhesi kongiri kunovandudza brittleness yekongiri, ichipa zvinhu zveConfucian zvakanaka kuoma.
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Nguva yekutumira: Jan-05-2023