Hauv cov cheeb tsam uas muaj av qeeg, lub hom phiaj tseem ceeb tshaj plaws rau cov kws tsim qauv tsim qauv yog tsim cov tsev thiab cov vaj tse uas tuaj yeem tiv taus cov kev txav tseem ceeb hauv av yam tsis muaj kev puas tsuaj loj. Ib txwm siv dag zog ua vaj tse, thaum muaj zog hauv compression, feem ntau nthuav tawm tus cwj pwm nkig nyob rau hauv qhov nyuaj, kev thauj khoom cyclic yuam los ntawm cov xwm txheej seismic. Qhov no brittleness tuaj yeem ua rau tam sim ntawd, tsis yog - zawv zawg. Nyob rau hauv xyoo tas los no, kev koom ua ke ntawm fiber ntau reinforcement, tshwj xeeb tshaj yog txias drawn steel fibers, tau tshwm sim los ua ib tug transformative technology los txhim kho lub ductility thiab lub zog dissipation muaj peev xwm ntawm cov pob zeb, ua rau nws tshwj xeeb tshaj yog haum rau seismic- tiv thaiv kev tsim kho.
Kev Tsim Kho Ntug: Txheej Txheem Txias Txias
Qhov kev ua tau zoo tshaj ntawm cov fibers no pib ntawm theem tsim khoom. Kev kos duab txias yog hlau- txheej txheem tsim uas cov hlau xaim raug rub (kos) los ntawm cov txheej txheem me me tuag ntawm chav tsev kub. Cov txheej txheem no ua rau kom muaj zog tensile thiab tawm dag zog ntawm cov hlau los ntawm kev ua kom tawv tawv. Tsis zoo li kub- dov los yog txiav daim ntawv fibers, txias drawn fibers muaj ib tug smoother, ntau yam khaubncaws sab nraud povtseg thiab ib tug heev aligned internal grain qauv. Txoj kev tsim khoom no ua rau cov fibers nrog lub zog tshwj xeeb - rau - qhov loj piv thiab, qhov tseem ceeb tshaj plaws rau kev siv seismic, txhim kho ductility - muaj peev xwm ua rau cov yas deformation ntau heev ua ntej tawg.
Mechanisms ntawm Seismic Performance Enhancement
Thaum dispersed randomly thoob plaws hauv ib qho kev sib xyaw ua ke, cov khaub thuas kos steel fibers ua raws li peb -dimensional micro- txhawb nqa network. Lawv qhov kev pab cuam rau seismic tsis kam yog multifaceted:
1. Ncej -Cracking Tensile Capacity thiab Ductility:Thawj qhov tsis muaj zog ntawm cov pob zeb dawb yog nws lub zog tensile tsawg. Thaum pib tawg nyob rau hauv seismic load, tsoos pob zeb poob kev ncaj ncees. Cold drawn steel fibers txuas cov micro- tawg, hloov kev ntxhov siab hla lawv. Qhov no tso cai rau lub pob zeb ua kom muaj kev thauj khoom tseem ceeb- cov kabmob muaj peev xwm txawm tias tom qab tawg, nthuav tawm pseudo-kev nyuaj siab- cov lus teb. Lub siab ductility ntawm cov khaub thuas rub fiber ntau nws tus kheej ua kom nws tuaj yeem elongate thiab nqus lub zog yam tsis muaj snapping brittlely.
2. Zog Dissipation:Av qeeg muab lub zog kinetic rau hauv cov qauv. Lub inelastic deformation ntawm lub txias drawn steel fibers, raws li lawv rub tawm ntawm lub pob zeb matrix los yog tawm los, muab ib tug zoo heev mechanism rau dissipating no zog. Cov txheej txheem no hloov lub zog kinetic kev puas tsuaj rau hauv tshav kub thiab lwm yam ntaub ntawv, damping cov txheej txheem teb thiab txo cov rog uas tau ntsib los ntawm thawj qhov kev txhawb zog.
3. Crack Control thiab Integrity Maintenance:Los ntawm kev txwv tsis pub qhib thiab nthuav tawm, fibers tiv thaiv qhov chaw ntawm kev puas tsuaj. Qhov no tswj kev spalling thiab fragmentation, tswj tag nrho kev ncaj ncees thiab shear peev xwm ntawm cov tswv cuab xws li kab teeb, kab, thiab kab teeb -kem pob qij txha thaum lub sij hawm cyclic loading. Nws kuj tseem txhim kho cov kav ntev los ntawm kev txo cov permeability tom qab- cracking.
Kev sib koom ua ke nrog Cov Txheej Txheem Txhim Kho thiab Cov Khoom Siv Khoom
Cold drawn steel fibers feem ntau tsis yog ib qho kev hloov pauv tag nrho rau ib txwm rebar hauv thawj qhov kev thauj khoom -cov kabmob cov ntsiab lus tab sis yog siv ntxiv. Lawv txhim khu kev ua tau zoo ntawm cov pob zeb ua vaj tse nws tus kheej, ua rau lub npe hu ua Steel Fiber Reinforced Concrete (SFRC). Kev suav nrog cov fibers tuaj yeem txhim kho cov khoom ua vaj tse tshiab, xws li kev ua haujlwm, thaum siv cov superplasticizers tsim nyog, raws li tau sau tseg hauv kev sib xyaw tsim rau SFRC. Nyob rau hauv nws lub xeev hardened, SFRC nrog txias drawn fibers qhia tau hais tias txhim kho toughness, cuam tshuam tsis kam, thiab qaug zog zog-txhua yam zoo nyob rau hauv seismic tej yam kev mob.
Kev tshawb fawb txog cov ntaub ntawv kev ua tau zoo nyob rau hauv kev ntxhov siab, xws li kev tshawb fawb txog kev ntxhov siab corrosion cracking tsis kam ntawm siab -lub zog steels nyob rau hauv cov txheej txheem sib txawv, qhia txog qhov tseem ceeb ntawm kev nkag siab txog cov khoom siv hauv kev xav tau ib puag ncig. Kev tswj hwm microstructure ntawm cov khaub thuas rub cov fibers pab txhawb kev txhim khu kev qha thiab kev ua tau zoo hauv cov xwm txheej hnyav uas yuav ua raws li cov xwm txheej seismic.
Daim ntawv thov hauv Seismic-Resistant Structures
Daim ntawv thov ntawm txias drawn steel fiber reinforced pob zeb yog tshwj xeeb tshaj yog zoo nyob rau hauv:
Seismic Retrofit:Txhaj tshuaj fiber ntau-xws li txhaj tshuaj tiv thaiv kab mob los yog casting fiber ntau- ntxiv cov tsho nyob ib ncig ntawm cov kab thiab cov phab ntsa uas twb muaj lawm.
Ductile Structure Elements:Casting cov cheeb tsam tseem ceeb nyob rau lub sijhawm - tiv thaiv cov thav duab, cov kab teeb sib txuas, thiab cov phab ntsa uas muaj lub zog loj yuav tsum tau ua.
Prefabricated Elements:Tsim precast seismic- tiv thaiv kev sib txuas, vaj huam sib luag, thiab qhov hauv qhov chaw uas tswj cov ductility yog qhov tseem ceeb.
Slabs ntawm Qib thiab Foundations:Txo cov kab nrib pleb thiab txhim kho cov khoom xa tawm hauv lub hauv paus ntsiab lus raug rau hauv av deformation.
Xaus: Ib qho Paradigm rau Resilient Construction
Kev sib koom ua ke ntawm cov khaub thuas rub cov hlau fiber ntau rau hauv cov pob zeb sawv cev rau kev nce qib tseem ceeb hauv kev nrhiav cov seismic resilience. Los ntawm imparting zoo ductility, superior tawg tswj, thiab txhim khu lub zog dissipation muaj peev xwm, cov khoom siv technology no ncaj qha hais txog qhov tseem ceeb ntawm kev tsim seismic. Nws ua rau cov qauv khoov tsis yog tawg, nqus thiab tawg lub zog, thiab kom muaj sia nyob av qeeg loj nrog kev puas tsuaj. Raws li cov cai hauv tsev txuas ntxiv hloov mus rau kev ua tau zoo-raws li seismic tsim, txias kos steel fiber reinforced pob zeb sawv tawm raws li cov khoom siv tseem ceeb rau kev tsim kom muaj kev nyab xeeb, muaj zog dua qub rau yav tom ntej.
