Yuav Ua Li Cas Koj Nyeem Ntawv Txhuas Bar Grating Load Table?
Ib aluminium bar grating load rooj yog pab tau tsuas yog thaum nws cov khoom configuration, ncua, loading qauv thiab tsim assumption match lub vaj huam sib luag raug txiav txim. Txheeb xyuas qhov yuav tsum tau ua thiab qhov sib thooj deflection sib cais: qhov kev thov hauv qab ntawm qhov tabulated load tseem tuaj yeem tsim muaj zog ntau dua li qhov project tso cai. Kev nkag siab-load tseem tsis tuaj yeem npog lub log lossis cov cuab yeej nqaim ko taw.
Thaum ntsuas TOP METAL's kev cai aluminium walkway grating, txuas qhov muab bar seem, sib nrug thiab txhawb kev kos duab rau lub rooj sib tham. Cov piv txwv hauv qab no piav qhia txog kev nyeem ntawv; lawv tsis yog TOP METAL cov khoom ntaus nqi lossis qhov kev pom zoo ntawm cov qauv tsim tshwj xeeb.
Sib piv lub Load Table rau qhov tseeb Grating thiab Span
Txheeb xyuas tsev neeg grating, ntu bar thiab qhov sib nrug
Pib nrog lub rooj nqes dua li nws cov nqi thauj khoom loj tshaj plaws. Ib lub rooj rau ib tsev neeg grating tsis tuaj yeem hloov mus rau lwm yam khoom nrog tib lub alloy lossis sab nraud qhov ntev. Rectangular bearing tuav thiab txhuas I-bar grating muaj qhov sib txawv ntawm qhov sib txawv; cov khoom seem uas cuam tshuam, qhov sib nrug ntawm qhov bar thiab kev tsim khoom tsim khoom yuav tsum tau tsim ua ntej sib piv muaj peev xwm.
Cov kabmob muaj peev xwm nqa tau thoob plaws lub sijhawm. Lawv qhov tob thiab qhov sib txawv ntawm qhov cuam tshuam cuam tshuam rau kev khoov thiab khov kho, thaum lawv qhov sib txawv txiav txim siab seb muaj pes tsawg tus tuav muaj nyob thoob plaws qhov dav. Hla tuav txuas lub rooj sib txoos, tab sis lawv lub xub ntiag tsis ua rau txhua qhov kev taw qhia lossis kev sib tw hneev taw.
Muab lub rooj mus rau lub vaj huam sib luag npaj
| Cov lus qhia | Yuav tsim dab tsi | Common misreading |
|---|---|---|
| Tsev neeg thiab cov khoom siv hauv paus | Cov kev tsim kho uas tau teev tseg, alloy / temper assumptions thiab tsim hauv paus siv. | Txhua qhov txhuas grating tuaj yeem siv tib lub rooj. |
| Bearing-bar seem | Qhov tob, thickness thiab cov duab plaub los yog zoo li tus seem match. | Qhov sib npaug tag nrho qhov tob txhais tau tias sib npaug sib npaug. |
| Bar sib nrug | Qhov nruab nrab-rau-center spacing thiab nws cov units sib phim. | Qhov kev ncua deb yuav tsum yog ib millimeter qhov ntev. |
| Span thiab kev txhawb nqa qauv | Lub rooj tsis txhawb nqa qhov ntev thiab kev txhawb nqa kev xav zoo sib xws rau daim duab. | Sab nraum vaj huam sib luag ntev yog ib txwm tabulated ncua. |
Piv txwv li, Grating Pacific's luam tawm "19 Chaw" txhuas lub rooj txheeb xyuas qhov sib nrug ntawm qhov sib nrug ntawm 1-3/16 hli. Qhov "19" tsis yog 19 hli. Nyeem cov npe hauv lub rooj ntawm nws tus kheej tsis yog txhais tus lej los ntawm qhov pom. [1]
Siv cov lus txhais tau hais tseg, tsis yog qhov ntev ntawm lub vaj huam sib luag
Nrhiav cov kab kev txhawb nqa thiab bearing-bar kev taw qhia ntawm daim duab. Qhov twg lub rooj txhais qhov ncua sij hawm raws li qhov tsis txaus ntseeg nyob deb, siv qhov loj me-tsis yog qhov ntev ntawm lub vaj huam sib luag nrog rau nws qhov kawg. Ib lub vaj huam sib luag tig los ntawm 90 degrees tuaj yeem khaws tib qhov ntev ntawm sab nraud thaum muab cov kabmob tuav hauv qhov tsis ncaj ncees lawm rau qhov kev npaj txhawb nqa.
Lub sijhawm no, qhov kev txiav txim siab seb lub rooj puas siv tau. Yog tias daim duab thiab lub rooj tsis pom zoo, daws qhov tsis sib haum ua ntej xaiv ib kab lossis cuam tshuam tus nqi.
Nyeem Uniform Load, Concentrated Load thiab Deflection raws li ntau qhov sib txawv
Khaws psf, phaus ib ko taw ntawm qhov dav thiab deflection cais
Cov tsiaj ntawv hauv lub rooj thauj khoom piav qhia ntau qhov sib txawv, tsis hloov pauv hloov pauv ntawm lub vaj huam sib luag "qhov hnyav txwv." Nyob rau hauv lub inch-phaus rooj siv ntawm no, cov lus dab neeg distinguishes cov nram qab no:
Nyeem txhua tus nqi nrog nws cov duab kos thiab cov units
| Cim | Lub ntsiab lus hauv cov lus piv txwv | Chav tsev |
|---|---|---|
| U | Uniformly faib load tshaj qhov grating cheeb tsam | lb/ft², feem ntau sau psf |
| C | Concentrated load ntawm midspan, qhia ib ko taw ntawm grating dav | lb rau linear ko taw ntawm grating dav |
| D | Deflection cuam tshuam nrog cov kab U lossis C | ntiv tes |
Khaws lub deflection ua ke nrog nws cov ntaub ntawv thauj khoom. Cov kab D cuam tshuam nrog cov khoom thauj tsis sib xws tsis yog qhov deflection rau cov concentrated load hauv qab nws. Cov rooj ntsuas ntsuas yuav siv cov lus sib txawv ntawm chav tsev, yog li sib piv cov ntsiab lus ua ntej hloov cov lej.
Tshawb xyuas cov hneev taw ua ntej siv tus nqi siab-load
Tabulated midspan load qhia ib ko taw ntawm grating dav tsis cia li sawv cev rau ib tug me me thaj ua rau thaj. Cov cuab yeej nqaim ko taw yuav pib tsuas yog ib feem ntawm lub vaj huam sib luag dav. Nws tus cwj pwm nyob ntawm cov tuav tuav thiab yuav ua li cas lub rooj sib txoos faib cov khoom ntawd. [2]
Tsis txhob muab C los ntawm tag nrho lub vaj huam sib luag dav thiab siv qhov tshwm sim los pom zoo rau lub log lossis cov khoom siv ko taw. Tsim cov hneev taw, txoj hauj lwm thiab siv tau cov ntaub ntawv ua ntej. TOP METAL's txoj kev taug kev thiab ntaiv-tread specification qhia npog cov duab kos thiab cov ntaub ntawv txhawb nqa uas xav tau los piav txog daim ntawv thov ua ntej xaiv lub rooj.
Kos Deflection Txawm tias thaum lub Load nyob hauv qab lub rooj nqi
Cais lub peev xwm thauj khoom los ntawm kev kuaj deflection
Lub zog-txog kev txwv kev txwv thiab kev txwv deflection teb cov lus nug sib txawv. Thawj qhov kev txhawj xeeb ntawm lub rooj tsim qauv tsim; Qhov thib ob txhawj xeeb npaum li cas lub vaj huam sib luag txav raws li qhov teev tseg. Nyeem ob qho tib si tawm tsam qhov kev xav tau ntawm qhov project es tsis txhob kho qhov kev sib piv muaj peev xwm raws li kev txiav txim siab lees paub tiav.
Ua hauj lwm los ntawm ib daim ntawv sau meej meej nyeem ntawv piv txwv
Luam tawm cov ntaub ntawv siv: Grating Pacific's 19 Chaw txhuas lub rooj muab cov khoom sib xws ntawm 281pf wb thiab ib tug coj deflection ntawm 0.324 ib rau cov 1 × 3/16 nti rectangular bearing-bar nkag ntawm qhov tsis txhawb nqa ntawm 3ft ibib ,914mm. [1]
Lub rooj siv rau 19-series cov khoom teeb tsa tau pom nyob rau hauv nws cov lus qhia, nrog cov kabmob tuav ntawm 1-3/16 hauv cov chaw. Nws cov txiaj ntsig theoretical siv tag nrho cov kabmob-bar ntu thiab khoov fiber ntau ntawm kev ntxhov siab 12,000 psi. Cov no yog cov lus qhia cov kev xav, tsis tau txheeb xyuas cov khoom ntawm TOP METAL vaj huam sib luag. Kev sib piv tsuas yog qhov ntev ntawm qhov bar yog li tsis txaus hloov lub rooj mus rau lwm yam khoom.
Tshaj tawm cov txiaj ntsig ntawm lub rooj thiab cais cov tswv yim hypothetical inputs
| Yam khoom | Tus nqi | Hauv paus |
|---|---|---|
| Tabulated uniform load, U | 281 hli (13.45 kPa) | Tshaj tawm cov ntaub ntawv siv |
| Sib piv deflection | 0.324 nyob rau hauv (8.23mm) | Tshaj tawm cov ntaub ntawv siv |
| Tag nrho uniform load los ntsuas | 250 psf (11.97 kPa) | Hypothetical tswv yim, suav nrog cov khoom siv thauj khoom |
| Deflection txwv rau qhov piv txwv no | 0.25 nti (6.35 hli) | Hypothetical project criterion, tsis yog ib tug universal yuav tsum tau |
Xav txog tib lub geometry, kev txhawb nqa kev npaj thiab cov qauv kev thauj khoom zoo ib yam, nrog tus cwj pwm linear-elastic. Deflection ces scale nrog lub load:
Kwv yees deflection = 0.324 × (250 ÷ 281) = 0.288 ib7.32mm 7.
Qhov kev thov ntawm 250 psf yog qis dua 281 psf, tab sis qhov kwv yees txav tau siab tshaj qhov xav tau 0.25 hauv kev txwv, kwv yees li 6.35 hli. Tus lej load sib piv ib leeg yog li tsis tsim kev lees paub.
Txheeb xyuas qhov kev tswj xyuas ua ntej xaiv lwm qhov loj me
Tib txoj kev sib raug zoo tuaj yeem raug rov kho dua kom pom cov khoom hnyav sib xws rau qhov kev txwv tsis pub muaj kev ntseeg siab:
Uniform load ntawm qhov piv txwv qhov deflection txwv = 281 × (0.25 ÷ 0.324) ≈ 216.8 wb, kwv yees 10.38 kPa.
Raws li cov kev xav no, lub deflection txwv tswj ua ntej tabulated dabtsi yog khoov-kev nyuaj siab txwv. Qhov kev thov 250 psf yog qis dua 281 psf tab sis saum toj no kwv yees li 216.8 psf cuam tshuam nrog kev xaiv txav txav. Tus nqi ntsuas no yog tshwj xeeb rau cov piv txwv qhia; nws tsis yog qhov chaw tsim khoom ntxiv ntsuas.
Cov kauj ruam tom ntej yog kom muaj lub luag haujlwm engineer soj ntsuam qhov tsim nyog bearing-bar seem, txhawb kev sib nrug lossis lwm yam kev tso cai hloov pauv, tom qab ntawd rov ua ob qho kev kuaj xyuas siv cov ntaub ntawv siv tau. Tsis txhob daws qhov teeb meem deflection tsuas yog los ntawm kev xaiv ib kab sib txawv nrog lub ntsiab lus siab dua, lossis siv qhov sib piv ntawm qhov loading sib txawv.
Cov metric cov duab saum toj no yog chav hloov pauv ntawm tib qho piv txwv siv. Lawv tsis ua ib qho nominal 25 × 5 mm interchangeable nrog ib tug 1 × 3/16 nyob rau hauv bar. Cov khoom metric yuav tsum tau kuaj xyuas nws tus kheej qhov ntev thiab cov ntaub ntawv thauj khoom.
Nkag siab yog vim li cas qhov kev hloov me me tuaj yeem muaj teeb meem
Paub qhov txawv qhov cuam tshuam los ntawm kev ntsuas qhov ntsuas
Hloov cov load ntawm tib lub vaj huam sib luag tsis yog tib yam kev ua haujlwm raws li kev hloov nws qhov ntev. Rau qhov tsis hloov pauv thiab cov khoom siv hauv ib qho kev txhawb nqa yooj yim, cov qauv hnyav hnyav, qhov kev ntxhov siab-tswj tso cai thauj khoom sib txawv nrog 1/L². Ntawm qhov ruaj khov load siv, deflection txawv nrog L⁴, qhov twg L yog span.
Qhov hypothetical 20% nce nyob rau hauv ncua yog li muab:
Span nce mus rau 1.20 npaug ntawm nws tus nqi qub; lwm yam qauv inputs tsis hloov
| Ntau | Piv rau tus nqi qub | Txhais lus |
|---|---|---|
| Kev ntxhov siab-tswj uniform-load peev xwm | 1 ÷ 1.20² ≈ 0.694 | Kwv yees li 69.4% ntawm tus nqi qub |
| Deflection ntawm tib lub teeb load siv | 1.20⁴ ≈ 2.074 | Txog 207.4% ntawm tus nqi qub |
Ntawm no, "tib lub zog hnyav" txhais tau hais tias tib qhov kev faib tawm ntawm ib cheeb tsam, tsis yog tib lub zog tag nrho kis mus rau lub vaj huam sib luag ntev. Khaws qhov sib txawv kom meej meej tiv thaiv lwm qhov kev sib piv tsis raug.
Tsis txhob overpolate dhau lub rooj yam tsis tau kuaj xyuas tus qauv
Cov piv txwv no piav qhia rhiab heev; lawv tsis tso cai los txuas lub chaw tsim khoom lub rooj. Nruam spans, cantilevers, hloov seem, concentrated loads thiab sib txawv cov ntsiab lus yuav tsum tau lawv tus kheej kev kho mob. Lwm qhov kev txwv yuav tswj tau ua ntej qhov kev sib txuas yooj yim khoov ua.
Thaum ib qho kev hloov pauv tom qab cov lus hais, muab TOP METAL qhov kev hloov kho kev txhawb nqa thiab kev teeb duab vaj huam sib luag es tsis yog khaws cov khoom qub piav qhia nrog qhov ntev tag nrho. Cov kev hloov kho tshiab yuav tsum muaj cov txheej txheem sib xws.
Paub Thaum Lub Rooj Tshaj Tawm tsis siv ntxiv lawm
Nyeem dead-load, nto thiab cov lus-footnote tej yam kev mob
Tshawb xyuas seb qhov kev thauj khoom uas tau teev tseg suav nrog tus kheej qhov hnyav lossis hais txog kev thauj khoom ntxiv rau lub grating. Aluminium P-19 rooj hauv ANSI/NAAMM MBG 531-24, luam tawm nplooj 12–13, qhia meej meej tsis suav nrog lub grating qhov tuag load. Txheeb xyuas seb tus kheej qhov hnyav npaum li cas rau hauv qhov project xam; tsis txhob tso tseg lossis suav nws ob zaug. [2]
Nyeem cov kab hnyav, shading thiab sau ntawv saum npoo ib yam li ua tib zoo. Ib qho kev nthuav dav dav tuaj yeem sib haum rau ib qho kev taug kev-load thiab deflection ua ke, tsis yog txhua qhov kev thauj khoom ntawm nplooj ntawv. Cov kev cai tshwj xeeb rau saum npoo rau cov kab serrated kuj muaj nyob rau hauv lub rooj; tsis txhob hloov qhov kev nkag mus tau yooj yim yam tsis tau kuaj xyuas cov lus qhia siv. [1]
Escalate hloov panels thiab unmatched load rooj plaub rau tshuaj xyuas
Ib qho kev txiav tawm uas cuam tshuam cov kabmob, qhov chaw txhawb nqa hloov pauv lossis qhov tsis sib haum xeeb hauv zos hloov pauv txoj kev thauj khoom. Ib lub rooj uas tsis muaj vaj huam sib luag tsis qhia txog qhov txaus ntawm qhov kev hloov kho ntawd. Kho cov txheej txheem nthuav dav nrog tus kws ua haujlwm lub luag haujlwm thiab tau txais cov ntaub ntawv uas sib haum rau cov khoom siv tiag tiag. [2]
Thaum xav txog lwm txoj hauv kev los ntawm TOP METAL's aluminium bar grating ntau yam, thov cov duab kos thiab load-deflection cov ntaub ntawv rau qhov kev xaiv tshwj xeeb. Muab piv rau tib lub sijhawm, thauj cov hneev taw thiab kev lees paub ua ntej ua kev sib piv ua lag luam.
Lub hom phiaj ntawm kev ua tau zoo yog kev sib tw traceable ntawm vaj huam sib luag, span, load case, deflection criterion thiab cov lus sau. Txhawm rau tham txog qhov kev txiav txim siab nrog TOP METAL, xa cov grating drawing thiab load-table xav tau, suav nrog cov txheej txheem kev txhawb nqa, kev thauj khoom hneev taw, qhov xav tau txwv thiab cov lus siv tau raug tshuaj xyuas. Paub meej tias cov ntaub ntawv qhia kev twg siv rau cov khoom muag ua ntej kho tus nqi luam tawm raws li nws qhov kev ntsuas.
Technical References
[1] Grating Pacific. 19 Chaw (1-3/16 nyob rau hauv) Aluminium Grating Load Table, ib nplooj ntawv siv. Siv rau qhov sib txawv, U/C/D lus dab neeg, 1 × 3/16 nyob rau hauv nkag ntawm 3 ft unsupported span, xam hauv paus thiab footnotes. Tsis muaj hnub; tau txais Lub Kaum Hli 27, 2026.
[2] National Association ntawm Architectural Hlau Manufacturers. Hlau Bar Grating phau ntawv, ninth edition, ANSI/NAAMM MBG 531-24 (2024). Cov nplooj ntawv luam tawm 12–13: txhuas P-19 thauj cov rooj thiab cov ntawv sau; nplooj 15: kev teeb tsa thiab hloov cov kabmob tuav; Cov ntawv ntxiv A, nplooj 27: cov duab kos.