Dab tsi yog Roof Steel Truss?
Lub ru tsev steel truss yog prefabricated structural moj khaum ua los ntawm steel cov tswv cuab nyob rau hauv ib tug series ntawm daim duab peb sab. Daim duab peb sab geometry ua rau lub truss inherently ruaj khov: loads yog nqa tsuas yog raws li axial nro thiab compression nyob rau hauv cov tswv cuab es tsis yog dabtsi yog khoov, yog li ntev spans yuav ua tau tiav nrog cov khoom me me. Qhov no yog vim li cas lub ru tsev russes yog cov qauv kev daws teeb meem rau warehouses, industrial nroj tsuag, aircraft hangars, gymnasiums, ua liaj ua teb tsev thiab coj mus muag halls uas yuav tsum tau loj kem - dawb sab hauv.
Lub ru tsev trusses feem ntau yog tsim nyob rau hauv lub khw los ntawm steel seem thiab daim hlau, ces thauj mus rau qhov chaw thiab tsim los ntawm crane, nrog rau kev sib txuas ua ke los ntawm siab - lub zog bolts los yog welds. Tsim thiab tsim ua raws li cov qauv steel qauv siv rau thaj tsam qhov project, xws li GB 50017 hauv Suav teb, AISC 360 hauv North America lossis EN 1993 hauv Tebchaws Europe, siv cov qauv steel qib xws li Q235B, Q355B, ASTM A36 / A572 lossis EN 10025 S355.
Lub ntsiab Cheebtsam ntawm ib lub ru tsev steel Truss
Sab saum toj chord- cov tswvcuab ntawm ciam teb sab sauv uas tiv thaiv axial compression thiab lub zog dabtsi yog khoov xa los ntawm lub ru tsev purlins.
Hauv qab chord- tus tswv cuab ntawm ciam teb qis uas ua raws li kev sib tw nro tiv thaiv sab nraud ntawm lub truss.
Cov tswv cuab hauv Web- sab hauv kab pheeb ces kaum thiab ntsug txuas cov chords; lawv hloov shear loads ntawm sab saum toj thiab hauv qab chords.
Gusset phaj nodes- steel daim hlau qhov twg chords thiab cov tswv cuab hauv web sib tshuam, txuas nrog bolting lossis vuam.
Apex node- qhov kev sib txuas siab tshaj plaws uas ob lub chords sab saum toj ntsib.
X- kev sib tw- cov tswv cuab thib ob bracing uas muab kev ruaj ntseg rau sab nraud thiab tiv thaiv cua -induced twist.
Phab ntsa daim hlau / bearing puag daim hlau- daim hlau uas txhawb nqa lub russ xaus thiab hloov lub ru tsev loads rau txhua kab lossis phab ntsa.
Common Roof Steel Truss Hom
| Hom Truss | Geometry | Hom kev siv |
|---|---|---|
| Fink truss | W-zoo li tus webs | Standard industrial Rhiav, ua liaj ua teb tsev cog khoom, nruab nrab warehouses |
| Howe truss | Verticals nyob rau hauv compression, diagonals nyob rau hauv nro | Heavy concentrated loads nyob rau hauv industrial cov nroj tsuag thiab choj kev txhawb nqa |
| Pratt kev | Verticals nyob rau hauv nro, diagonals nyob rau hauv compression | Cov chaw logistics loj thiab dav -span nroj tsuag nyob rau hauv lub ntiajteb txawj nqus loads |
| Warren truss | Equilateral daim duab peb sab webbing | Nruab nrab mus rau ntev spans nrog uniformly faib loads |
| Scissor truss | Hla nqeeb hauv qab chords | Exhibition halls, churches, lobbies yuav tsum tau tsa vaulted ceilings |
| Mono truss | Tib - txoj kab nqes, txoj cai -angled profile | Carports, chaw nthuav dav, ib qho -pitch sheds |
| Ntxuam trus | Radiating kiv cua-zoo li tus webs | Dav -kev cob qhia, auditoriums, gymnasiums |
| King post truss | Ib ntsug ncej nrog ob kab pheeb ces kaum | Luv -span garages, tool sheds, secondary tying frames |
| Poj huab tais post truss | Ob tug symmetrical ntsug struts | Nruab nrab -span industrial thiab civil sloped ru tsev |
Qhov kev xaiv ntawm truss hom nyob ntawm qhov tseeb ncua, ru tsev txoj kab nqes, thauj khoom thiab architectural xav tau. Rau ib qhov project tshwj xeeb, truss geometry thiab cov tswv cuab qhov ntau thiab tsawg yuav tsum tau lees paub los ntawm cov qauv tsim raws li txoj cai tswj hwm.
Qhov zoo ntawm Steel Roof Trusses
Siab zog - rau - Qhov hnyav piv
Vim tias cov tswv cuab truss ua haujlwm feem ntau hauv axial nro thiab compression, steel siv tau zoo thiab lub ru tsev tuag load tsawg. Cov ru tsev sib zog txo qhov kev thauj khoom ntawm cov kab thiab cov hauv paus, uas yog qhov tshwj xeeb tshaj yog muaj txiaj ntsig ntawm cov av tsis zoo lossis cov hauv paus uas kim.
Ntev Clear Spans
Los ntawm kev hloov lub sijhawm khoov mus rau hauv lub zog axial, trusses tuaj yeem hla ntau dua li cov kab teeb ntawm qhov hnyav zoo sib xws, tsim kem - qhov chaw dawb rau cov tsev khaws khoom, cov chaw ua kis las thiab cov tsev nyob hauv lub davhlau ya nyob twg.
Zoo Seismic thiab Dynamic Behavior
Qhov qis ntawm cov hlau truss txo qis seismic thov, thiab cov ductility ntawm steel tso cai rau cov qauv kom dissipate lub zog nyob rau hauv av qeeg kev txiav txim thaum sib txuas lus kom ntxaws.
Fast, Industrialized Tsim
Trusses yog prefabricated nyob rau hauv lub Hoobkas nrog meej txiav thiab vuam, thiab qhov chaw sib dhos cia siab rau kev sib txuas bolted. Qhov no ua rau qhov kev tsim kho luv luv thiab txo qis ntawm -qhov chaw ua haujlwm thiab huab cua txaus ntshai.
Tsim Flexibility
Truss geometry tuaj yeem hloov kho rau lub ru tsev tiaj tus, pitched lossis nkhaus, thiab lub vev xaib qhib tso cai rau cov kev pabcuam xws li ducts, kav dej thiab teeb pom kev zoo kom dhau los ntawm qhov tob ntawm truss.
Steel Roof Trusses vs. Ntoo Trusses
| Yam khoom | Hlau Roof Truss | Ntoo Roof Truss |
|---|---|---|
| Durability | Inorganic khoom; resistant rau rot, termites thiab pwm thaum coated | Cov khoom siv organic; susceptible rau ntoo -dab kab thiab ya raws |
| Dimensional stability | ruaj khov; tsawg shrinkage los yog warping nrog kub hloov | Yuav warp, phua los yog twist nrog cov av noo hloov raws caij nyoog |
| Span muaj peev xwm | Lub zog siab - rau - qhov hnyav piv tso cai rau qhov pom tseeb ntev | Txwv ncua; hnyav seem los yog ntxiv framing xav tau rau dav spans |
| Hluav taws coj cwj pwm | Tsis yog-combustible; tiv thaiv los ntawm hluav taws- cov txheej txheem ntsuas qhov xav tau | Combustible; yuav tsum tau hluav taws kub-kev kho mob retardant |
| Hauv - chaw ua haujlwm | Bolted prefabricated los ua ke, tsawg dua qhov chaw lag luam | Extensive field framing thiab carpentry |
Thov Lub Tsev Steel Truss Tsim thiab Nqe Lus
Cov lus nug nquag
Q: Ntev npaum li cas steel ru tsev trusses kav ntev?
Nrog rau kev tiv thaiv corrosion zoo thiab kev saib xyuas ib ntus, steel ru tsev trusses tuaj yeem muab kev pabcuam lub neej ntawm ntau xyoo caum - feem ntau ntawm qhov kev txiav txim ntawm 50 xyoo lossis ntau dua thaum cov txheej txheem txheej yog sib npaug rau qhov chaw corrosivity qeb thiab khaws cia. Lub neej tiag tiag nyob ntawm ib puag ncig, txheej txheej zoo thiab kev tshuaj xyuas zaus.
Q: Lub qab nthab sab hauv puas tuaj yeem txuas nrog steel trusses?
Yog lawm, tab sis cov ntsiab lus kev sib txuas yuav tsum tau tsim, txij li lub chord hauv qab yog lub thauj khoom - nqa tus tswv cuab. Hangers, clips thiab framing tuaj yeem txuas rau ntawm qhov pom zoo los yog nrog cov chord nrog kev sib txuas ua ke; tus kws tsim qauv tsim qauv yuav tsum txheeb xyuas cov khoom ntawm lub qab nthab, rwb thaiv tsev thiab teeb pom kev zoo.
Q: Hom steel ru tsev trusses yog dab tsi?
Cov hom muaj xws li Pratt truss ( kab pheeb ces kaum hauv compression, ntsug hauv qhov nro), Fink truss (nrov rau me me thiab thaj chaw spans), Warren truss (sib npaug daim duab peb sab webbing), thiab Howe truss (vertticals hauv compression). Qhov zoo tshaj plaws yog nyob ntawm kev ncua, txoj kab nqes thiab kev thauj khoom.
Q: Dab tsi yog qhov dav dav rau steel ru tsev trusses?
Qhov sib txawv nyob ntawm lub ru tsev tuag load, ncua thiab cua los yog daus loads. Nyob rau hauv cov qauv kev lag luam thiab cov tsev lag luam, cov trusses feem ntau nyob ntawm qhov sib nrug ntawm ob peb meters - feem ntau nyob rau hauv thaj tsam ntawm 3 m txog 9 m center - mus rau -center - nrog purlins spanning ntawm trusses. Qhov sib nrug raws nraim yuav tsum tau txiav txim los ntawm kev tsim qauv.
Q: Puas yog steel ru tsev trusses xav tau kev saib xyuas?
Cov hlau trusses xav tau kev tu ncua tsawg dua li cov ntoo, tab sis kev tshuaj xyuas ib ntus raug pom zoo - tshwj xeeb yog kuaj xyuas cov txheej txheem ntawm cov pob qij txha, cov ntsiab lus sib txuas thiab thaj chaw uas cov xim tau khawb, kom cov xeb raug ntes thaum ntxov.
Q: Dab tsi yog qib steel siv rau lub ru tsev trusses?
Cov qib zoo yog Q235B thiab Q355B ib GB / T 1591, ASTM A36 thiab A572 Qib 50, lossis EN 10025 S235 thiab S355. Siab dua - qib zog yuav siv tau rau qhov ntev uas cov tswv cuab loj yog tswj hwm los ntawm lub zog ntau dua li qhov tawv.