I-steel fibre reinforced concrete (SFRC) iwuhlobo olusha lwempahla eyinhlanganisela engathululwa futhi ifuthwe ngokwengeza inani elifanele le-fiber yensimbi emfushane kukhonkolo ojwayelekile.Ithuthuke ngokushesha ekhaya naphesheya eminyakeni yamuva.Inqoba ukushiyeka kwamandla aphansi aqinile, ubude obuncane bokugcina kanye nempahla ephukayo kakhonkolo.Inezici ezinhle kakhulu ezifana namandla aqinile, ukumelana nokugoba, ukumelana ne-shear, ukumelana nokuqhekeka, ukumelana nokukhathala kanye nokuqina okuphezulu.Isetshenziswe kubunjiniyela be-hydraulic, umgwaqo kanye nebhuloho, ukwakhiwa kanye neminye imikhakha yobunjiniyela.
1. Ukuthuthukiswa kokhonkolo oqinisiwe we-fiber fiber
I-Fiber reinforced concrete (FRC) isifinyezo sikakhonkolo oqiniswe ngefayibha.Imvamisa iyinhlanganisela esekwe kusimende ehlanganiswe nokunamathisela usimende, udaka noma ukhonkolo kanye nefayibha yensimbi, i-inorganic fiber noma izinto eziqinisiwe ze-organic fiber.Kuyimpahla yokwakha entsha eyakhiwe ngokuhlakaza ngokulinganayo imicu emifushane necolekileyo enamandla amakhulu aqinile, ubude obuphakeme bokugcina kanye nokumelana okuphezulu kwe-alkali ku-matrix kakhonkolo.I-fiber ekukhonkoloni inganciphisa ukukhiqizwa kokuqhekeka kokuqala kukakhonkolo kanye nokwandiswa okwengeziwe kwemifantu ngaphansi kwesenzo samandla angaphandle, kunqobe ngempumelelo amaphutha angokwemvelo njengamandla aphansi aqinile, ukuqhekeka okulula kanye nokungakhathali kahle kukakhonkolo, futhi kuthuthukise kakhulu ukusebenza. wokungangenisi, ukungangeni kwamanzi, ukumelana nesithwathwa kanye nokuvikelwa kokuqinisa ukhonkolo.Ukhonkolo oqiniswe ngefiber, ikakhulukazi ukhonkolo oqiniswe ngefayibha yensimbi, udonse ukunakwa okwengeziwe emibuthanweni yezemfundo nobunjiniyela kubunjiniyela obusebenzayo ngenxa yokusebenza kwayo okuphezulu.Ngo-1907 uchwepheshe waseSoviet u-B П.I-Hekpocab yaqala ukusebenzisa ukhonkolo oqinisiwe we-fiber yensimbi;Ngo-1910, u-HF Porter washicilela umbiko wocwaningo mayelana nokhonkolo oqiniswe nge-fiber emfushane, ephakamisa ukuthi imicu yensimbi emifushane kufanele ihlakazwe ngokulinganayo kukhonkolo ukuze kuqiniswe izinto ze-matrix;Ngo-1911, uGraham wase-United States wengeza i-fiber yensimbi kukhonkolo evamile ukuze athuthukise amandla nokuzinza kukakhonkolo;Ngawo-1940, i-United States, iBrithani, iFrance, iJalimane, iJapane namanye amazwe ayesesenze ucwaningo oluningi ngokusebenzisa insimbi yensimbi ukuze kuthuthukiswe ukumelana nokugqokwa nokumelana nokuqhekeka kukakhonkolo. ukuma kwe-fiber yensimbi ukuthuthukisa amandla okubopha phakathi kwe-fiber ne-matrix yekhonkrithi;Ngo-1963, u-JP romualdi kanye no-GB Batson bashicilela iphepha mayelana nendlela yokuthuthukiswa kokuqhekeka kwe-steel fibre evalekile, base bebeka phambili isiphetho sokuthi amandla okuqhekeka kukakhonkolo oqinisiwe we-fiber fiber kunqunywa ukuhlukaniswa kwezikhala okuphakathi kwemicu yensimbi edlala indima ephumelelayo. ekucindezelekeni okuqinile (ithiyori yokuhlukanisa i-fiber), ngaleyo ndlela iqala isigaba sokuthuthuka esisebenzayo sale nto entsha eyinhlanganisela.Kuze kube manje, ngokuthandwa kusetshenziswa ukhonkolo oqinisiwe we-fiber fiber, ngenxa yokusatshalaliswa okuhlukene kwemicu kukhonkolo, kunezinhlobo ezine ikakhulukazi: ukhonkolo oqinisiwe we-fiber fiber, ukhonkolo oqinisiwe we-hybrid fiber, ukhonkolo oqinisiwe we-layer fiber kanye ne-hybrid fiber. ukhonkolo oqinisiwe.
2. Indlela yokuqinisa ukhonkolo oqinisiwe we-fiber fiber
(1)Ithiyori yemishini ehlanganisiwe.Ithiyori ye-composite mechanics isekelwe embonweni wezinhlanganisela ze-fiber eziqhubekayo futhi ihlanganiswe nezici zokusabalalisa zemicu yensimbi kukhonkolo.Kulo mbono, izinhlanganisela zithathwa njengezinhlanganisela zezigaba ezimbili ezinefiber njengesigaba esisodwa kanye ne-matrix njengesinye isigaba.
(2)Ithiyori yokuhlukanisa i-fiber.Ithiyori yokuhlukanisa i-fiber, eyaziwa nangokuthi ithiyori yokumelana nokuqhekeka, ihlongozwa ngokusekelwe kumishini yokuphuka okunwebekayo.Le thiyori ibamba ukuthi umphumela wokuqiniswa kwemicu uhlobene kuphela nesikhala sefayibha esatshalaliswe ngokulinganayo (isikhala esincane).
3. Ukuhlaziywa kwesimo sokuthuthukiswa kokhonkolo oqinisiwe we-fiber fiber
1.I-fiber yensimbi eqiniswe ukhonkolo.Ukhonkolo oqiniswe ngefayibha yensimbi wuhlobo lukakhonkolo oluqinisiwe olufana nolunezinhlangothi eziningi olwakhiwe ngokwengeza inani elincane le-carbon steel ephansi, insimbi engagqwali kanye nemicu ye-FRP kukhonkolo ojwayelekile.Inani elixutshwayo le-fiber yensimbi ngokuvamile liyi-1% ~ 2% ngevolumu, kuyilapho i-fiber yensimbi engu-70 ~ 100kg ixutshwa ku-cubic meter ngayinye kakhonkolo ngesisindo.Ubude be-fiber yensimbi kufanele bube ngu-25 ~ 60mm, ububanzi kufanele bube ngu-0.25 ~ 1.25mm, futhi isilinganiso esihle kunazo zonke sobude kuya kububanzi kufanele sibe ngu-50 ~ 700. Uma kuqhathaniswa nokhonkolo ojwayelekile, akukwazi nje ukuthuthukisa ukuqina, ukugunda, ukugoba. , ukumelana nokugqoka nokuqhekeka, kodwa futhi kuthuthukisa kakhulu ukuqina kokuphuka kanye nokumelana nomthelela kakhonkolo, futhi kuthuthukise kakhulu ukumelana nokukhathala nokuqina kwesakhiwo, ikakhulukazi ukuqina kungandiswa izikhathi ezingu-10 ~ 20.Izakhiwo zemishini kakhonkolo oqiniswe ngefayibha yensimbi kanye nokhonkolo ojwayelekile ziqhathaniswa eShayina.Lapho okuqukethwe kwe-fiber yensimbi kungu-15% ~ 20% kanye nesilinganiso sikasimende samanzi singu-0.45, amandla okubamba akhuphuka ngo-50% ~ 70%, amandla okuguquguquka akhuphuka ngo-120% ~ 180%, amandla omthelela akhuphuka ngo-10 ~ 20 izikhathi, amandla okukhathala okunomthelela akhuphuka izikhathi ezingu-15 ~ 20, ukuqina okuguquguqukayo kukhuphuka izikhathi ezingu-14 ~ 20, futhi ukumelana nokugqoka kuthuthukiswa kakhulu.Ngakho-ke, ukhonkolo oqiniswe nge-fiber yensimbi unezakhiwo ezingcono zomzimba nezomshini kunokhonkolo ongenalutho.
4. Hybrid fibre ukhonkolo
Idatha yocwaningo efanelekile ibonisa ukuthi i-fiber yensimbi ayikhuthazi kakhulu amandla okucindezela ukhonkolo, noma ngisho nokuwunciphisa;Uma kuqhathaniswa nokhonkolo ocacile, kukhona okuhle nokubi (ukwanda nokuncipha) noma ngisho nokubuka okuphakathi kokungangeni, ukumelana nokugqoka, umthelela nokumelana nokugqoka kwe-fiber yensimbi eqinisiwe ukhonkolo kanye nokuvimbela ukushwabana kokuqala kwepulasitiki kakhonkolo.Ngaphezu kwalokho, ukhonkolo oqinisiwe we-fiber wensimbi unezinkinga ezithile, ezifana nesilinganiso esikhulu, intengo ephezulu, ukugqwala futhi cishe akukho ukumelana nokuqhuma okubangelwa umlilo, okuye kwathinta ukusetshenziswa kwayo ngamazinga ahlukahlukene.Eminyakeni yamuva, ezinye izazi zasekhaya nezakwamanye amazwe zaqala ukunaka i-hybrid fiber concrete (HFRC), zizama ukuxuba imicu enezakhiwo nezinzuzo ezihlukene, ukufunda komunye nomunye, nokunikeza umdlalo "kumphumela omuhle we-hybrid" emazingeni ahlukene futhi. ukulayisha izigaba zokuthuthukisa izakhiwo ezahlukene zikakhonkolo, ukuze kuhlangatshezwane nezidingo zamaphrojekthi ahlukene.Kodwa-ke, mayelana nezakhiwo zayo ezihlukahlukene zemishini, ikakhulukazi ukuguqulwa kwayo kokukhathala kanye nokulimala kokukhathala, umthetho wokuthuthukiswa kwe-deformation kanye nezici zomonakalo ngaphansi kwemithwalo emile futhi eguquguqukayo kanye ne-amplitude eqhubekayo noma imithwalo ye-amplitude eguquguqukayo ye-cyclic, inani elilungile lokuxuba kanye nengxenye yokuxuba ye-fiber, ubuhlobo. phakathi kwezingxenye zezinto ezihlanganisiwe, umphumela wokuqinisa kanye nendlela yokuqinisa, ukusebenza kokukhathala, indlela yokwehluleka kanye nobuchwepheshe bokwakha, Izinkinga zokuklanywa kwesilinganiso sokuxutshwa zidinga ukufundwa okwengeziwe.
5. I-layered steel fibre ukhonkolo oqinisiwe
Ukhonkolo oqinisiwe we-monolithic fiber akulula ukuhlanganisa ngokulinganayo, i-fiber kulula ukuyihlanganisa, inani le-fiber likhulu, futhi izindleko ziphakeme kakhulu, ezithinta ukusetshenziswa kwayo okubanzi.Ngokusebenzisa inani elikhulu lomkhuba wobunjiniyela kanye nocwaningo lwethiyori, kuhlongozwa uhlobo olusha lwesakhiwo se-fiber yensimbi, ukhonkolo oqinisiwe we-layer steel fiber (LSFRC).Inani elincane le-fiber yensimbi lisakazwa ngokulinganayo ezindaweni ezingaphezulu neziphansi ze-slab yomgwaqo, kanti phakathi nendawo kuseyingqimba ecacile yekhonkrithi.I-fiber yensimbi ku-LSFRC imvamisa isatshalaliswa ngesandla noma ngomshini.Ifayibha yensimbi yinde, futhi isilinganiso sobubanzi bobude ngokuvamile siphakathi kuka-70 ~ 120, okubonisa ukusatshalaliswa kwezinhlangothi ezimbili.Ngaphandle kokuthinta izakhiwo zemishini, le nto ayinciphisi kakhulu kuphela inani le-fiber yensimbi, kodwa futhi igwema ukwenzeka kwe-fiber agglomeration ekuxubeni kokhonkolo oqinisiwe oqinisiwe.Ngaphezu kwalokho, isikhundla se-steel fiber layer kukhonkolo sinomthelela omkhulu emandleni e-flexural kakhonkolo.Umphumela wokuqinisa we-steel fibre layer ngaphansi kukakhonkolo ungcono kakhulu.Ngokuma kwe-steel fibre layer iya phezulu, umphumela wokuqiniswa wehla kakhulu.Amandla aguquguqukayo e-LSFRC angaphezulu kuka-35% aphezulu kunalawo kakhonkolo ongenalutho onengxenye efanayo yengxube, ephansi kancane kunaleyo yokhonkolo oqinisiwe we-fiber fiber.Nokho, i-LSFRC ingonga izindleko zempahla, futhi ayikho inkinga yokuxuba okunzima.Ngakho-ke, i-LSFRC iwukwaziswa okusha okunezinzuzo ezinhle zezenhlalo nezomnotho kanye namathemba abanzi okusebenza, okufanele ukudunyiswa nokusetshenziswa ekwakhiweni komgwaqo.
6. Ukhonkolo we-hybrid fibre enezingqimba
I-layer hybrid fibre reinforced concrete (LHFRC) iyinhlanganisela yento eyakhiwe ngokwengeza i-0.1% polypropylene fiber ngesisekelo se-LSFRC futhi yasabalalisa ngokulinganayo inani elikhulu lemicu ye-polypropylene emihle nefushane enamandla amakhulu aqinile kanye nobude obuphakeme bokugcina ensimbini engenhla nangaphansi. ukhonkolo we-fiber kanye nokhonkolo ongenalutho engxenyeni ephakathi.Inganqoba ubuthakathaka be-LSFRC ungqimba lukakhonkolo ongenalutho olumaphakathi futhi ivimbele izingozi ezingaba khona zokuphepha ngemva kokuba i-fiber yensimbi engaphezulu isigugile.I-LHFRC ingathuthukisa kakhulu amandla okhonkolo aguquguqukayo.Uma kuqhathaniswa nokhonkolo ongenalutho, amandla ayo okuguquguquka kakhonkolo ongenalutho akhuphuka cishe ngo-20%, futhi uma kuqhathaniswa ne-LSFRC, amandla ayo okuguquguquka akhuphuka ngo-2.6%, kodwa anomthelela omncane ku-flexural elastic modulus kakhonkolo.I-flexural elastic modulus ye-LHFRC iphakeme ngo-1.3% kunaleyo kakhonkolo ongenalutho futhi iphansi ngo-0.3% kunaleyo ye-LSFRC.I-LHFRC ingase futhi ithuthukise ngokuphawulekayo ukuqina kokuguquguquka kukakhonkolo, futhi inkomba yayo yokuqina eguquguqukayo icishe iphindwe izikhathi ezingu-8 kunokhonkolo ongenalutho kanye nezikhathi ezingu-1.3 kuneze-LSFRC.Ngaphezu kwalokho, ngenxa yokusebenza okuhlukile kwemicu emibili noma ngaphezulu ku-LHFRC kukhonkolo, ngokwezidingo zobunjiniyela, umphumela omuhle we-hybrid we-synthetic fiber kanye ne-fiber yensimbi kukhonkolo ingasetshenziswa ukuthuthukisa kakhulu i-ductility, ukuqina, ukuqina, amandla okuqhekeka. , amandla aguquguqukayo namandla aqinile ezinto ezibonakalayo, athuthukisa ikhwalithi yezinto ezibonakalayo futhi andise impilo yesevisi yezinto.
——Abstract (Shanxi architecture, Vol. 38, No. 11, Chen Huiqing)
Isikhathi sokuthumela: Aug-24-2022