Dab tsi yog Buckling Restrained Brace?
Lub Buckling Restrained Brace (uas yog luv luv rau BRB) yog ib yam khoom damping nrog lub zog siab dissipation muaj peev xwm.Nws yog cov txheej txheem brace nyob rau hauv ib lub tsev, tsim los tso cai rau lub tsev los tiv thaiv lub voj voog lateral loading, feem ntau av qeeg vim muaj av qeeg.Nws muaj ib tug slender steel tub ntxhais, lub pob zeb casing tsim los txuas ntxiv txhawb cov tub ntxhais thiab tiv thaiv buckling nyob rau hauv axial compression, thiab ib cheeb tsam interface uas tiv thaiv undesired kev sib cuam tshuam ntawm ob.Braced thav duab uas siv BRBs - lub npe hu ua buckling-restrained braced thav duab, los yog BRBFs - muaj txiaj ntsig zoo dua li cov qauv braced.
Lub buckling restrained brace ua haujlwm li cas?
Peb lub ntsiab tseem ceeb ntawm BRB tuaj yeem paub qhov txawv yog nws cov tub ntxhais hlau, nws daim ntawv cog lus-tiv thaiv txheej, thiab nws cov casing.
Cov tub ntxhais hlau yog tsim los tiv thaiv tag nrho axial quab yuam tsim nyob rau hauv lub bracing.Nws qhov chaw hla ntu tuaj yeem ua rau qis dua li ntawm cov hlua khi tsis tu ncua, vim nws qhov kev ua tau zoo tsis txwv los ntawm buckling.Cov tub ntxhais muaj qhov nruab nrab ntev uas yog tsim los ua kom tsis muaj zog thaum muaj av qeeg tsim;thiab nruj, tsis-yielding lengths ntawm ob kawg.Kev nce ntxiv ntawm thaj tsam ntawm qhov tsis-yielding seem kom ntseeg tau tias nws tseem elastic, thiab yog li plasticity yog concentrated nyob rau hauv nruab nrab ntawm cov tub ntxhais hlau.Xws li configuration muab kev ntseeg siab nyob rau hauv kev twv ua ntej ntawm lub ntsiab cwj pwm thiab tsis ua hauj lwm.
Daim ntawv cog lus-tiv thaiv txheej decouples lub casing los ntawm cov tub ntxhais.Qhov no tso cai rau cov tub ntxhais hlau los tiv thaiv tag nrho axial quab yuam tsim nyob rau hauv bracing, raws li tsim.
Lub casing - los ntawm nws cov flexural rigidity - muab kev txhawb nqa sab nraud tiv thaiv flexural buckling ntawm cov tub ntxhais.Nws feem ntau yog ua los ntawm cov pob zeb uas muaj cov hlau.Cov qauv tsim rau lub casing yog muab kev ruaj ntseg rau sab nraud (ie rigidity) tiv thaiv cov tub ntxhais hlau buckling.
Dab tsi yog qhov zoo ntawm buckling restrained brace?
Cov kev tshawb fawb sib piv, nrog rau cov kev tsim kho tiav, lees paub qhov zoo ntawm buckling-restrained braced frame (BRBF) systems.BRBF cov tshuab tuaj yeem ua tau zoo dua rau lwm cov qauv sib txawv nrog rau kev hwm thoob ntiaj teb rau kev ua haujlwm zoo rau cov laj thawj hauv qab no:
Buckling-restrained braces muaj lub zog dissipative tus cwj pwm uas tau txhim kho ntau los ntawm qhov tshwj xeeb Concentrically Braced Frames (SCBFs).Tsis tas li ntawd, vim tias lawv tus cwj pwm zoo siab dua li ntawm feem ntau ntawm lwm cov seismic systems (R = 8), thiab cov tsev feem ntau yog tsim los nrog lub sijhawm tseem ceeb, cov seismic loads feem ntau qis dua.Qhov no tuaj yeem ua rau txo qis ntawm cov tswv cuab (kem thiab kab teeb) qhov ntau thiab tsawg, kev sib txuas me dua thiab yooj yim dua, thiab cov kev xav tau me me.Tsis tas li ntawd, BRBs feem ntau yog nrawm dua li SCBFs, uas ua rau txo nqi rau tus neeg cog lus.Tsis tas li ntawd, BRBs tuaj yeem siv rau hauv seismic retrofitting.Thaum kawg, thaum muaj av qeeg, txij li qhov kev puas tsuaj yog tsom mus rau thaj chaw me me (lub brace yielding core), tom qab av qeeg tshawb nrhiav thiab hloov pauv tau yooj yim.
Ib txoj kev tshawb fawb ywj pheej tau xaus lus tias kev siv BRBF systems, uas yog siv lwm cov av qeeg, ua rau tus nqi ib square feet txuag txog li $5 ib square feet.
Dab tsi yog qhov zoo ntawm buckling restrained brace?
Lub buckling restrained brace system tsis yog tsuas yog siv nyob rau hauv kev tsim kho tshiab, tab sis kuj yog qhov kev txhawb nqa thiab kev tsim kho tshiab ntawm cov vaj tsev qub nyob ntawm nws qhov kev ua tau zoo thiab tus nqi qis.Daim ntawv thov teb yog raws li nram no.
Cov tsev siab siab / tshav dav hlau / Tsev kawm ntawv thiab tsev kho mob / Lub rooj sib tham thiab chaw ua yeeb yam / Lub tsev tsim khoom lag luam
