Kev faib tawm ntawm Dav Hlau Truss Hlau Purlins

Cov dav hlau dav hlau truss purlins tuaj yeem muab faib ua ob pawg: ib qho yog ua los ntawm lub kaum sab xis steel thiab puag ncig steel; lwm yam yog ua los ntawm txias-bent nyias-walled steel.
1. Lub kaum sab xis steel thiab round steel dav hlau truss purlins
Lub qaum chord ntawm lub purlin yog muab tso rau hauv ib tug V-puab nrog lub kaum sab xis steel, raws li qhia nyob rau hauv daim duab 3. Hom purlin no muaj tsis zoo lateral stiffness, tab sis nws yog ib qho yooj yim kom tau cov ntaub ntawv thiab muaj meej zog. Nws yog tsim rau ru tsev loads los yog ru tsev nrog me purlin sib nrug. Vim yog qhov me me purlin qhov sib txawv, lub purlin yuav tsum tau dhau los ntawm thaum txhim kho lub chord sab sauv, uas ua rau kev tsim kho teeb meem ntau dua. Txhawm rau daws qhov kev tsis sib haum xeeb no, lub purlin nrog rau sab sauv chord txhawb nqa tuaj yeem hloov mus rau lub vev xaib purlin.
2. Txias-bent nyias-walled steel dav hlau truss purlins
Cold-bent nyias-walled steel dav hlau truss purlins tau muab faib ua ob pawg.
(1) Tag nrho cov pas nrig ntawm purlin yog txias-khoov nyias-walled hlau. Nws yog tsim rau lub ru tsev nrog loj purlin sib nrug, siv cov hlau tsawg, muaj zog ntshiab, thiab muaj zog ntau dua ob sab hauv thiab sab nraum lub dav hlau.
(2) Lub ntsiab ntawm lub purlin, lub qaum chord thiab qhov kawg ntsug compression pas nrig, yog ua los ntawm txias-bent nyias-walled steel, thiab cov rods seem yog ua los ntawm round steel, raws li qhia nyob rau hauv daim duab 5. txhim khu kev ruaj ntseg ntawm purlin, nws kawg compression web tswv cuab yog nyiam dua ua los ntawm square raj. Nws yog feem ntau siv rau lub ru tsev nrog ib tug purlin nrug ntawm 1.5m. Piv nrog rau yav dhau los lub tiaj tiaj truss purlin, lub purlin no muaj peev xwm ua tau zoo ib yam, tab sis yooj yim dua kom tau txais cov ntaub ntawv thiab tsim khoom.