Hlau truss

Steel truss yog hais txog cov truss ua los ntawm steel. Steel trusses feem ntau yog siv los ua cov khoom tseem ceeb ntawm cov khoom siv hauv lub ru tsev, crane kab, txuas hniav thiab hydraulic rooj vag ntawm cov tsev lag luam thiab pej xeem. Txhua yam ntawm cov yees, xws li mast ntauwd, TV ntauwd thiab kis kab ntauwd, feem ntau spatial steel trusses muaj li ntawm peb, plaub los yog ntau tshaj dav hlau trusses.

Steel trusses feem ntau muab faib raws li cov duab kos duab, cov duab thiab cov yam ntxwv.

① Raws li cov duab kos duab, nws tuaj yeem muab faib ua kev txhawb nqa yooj yim thiab txuas ntxiv; Statically thiab statically indeterminate, planar thiab spatial. Tsuas txhawb nqa steel trusses feem ntau yog siv.

② Raws li cov duab, nws tuaj yeem muab faib ua daim duab peb sab, trapezoid, parallel chord thiab polygon. Daim duab peb sab steel truss (Fig. 1a) feem ntau yog siv rau lub ru tsev truss nrog ntxhab ru tsev nqes hav, thiab qhov ncua sij hawm yog feem ntau tsawg dua 18 ~ 24 meters; Trapezoidal steel trusses (Fig. 1b, c) feem ntau yog siv rau ru tsev trusses nrog maj mam ru tsev slopes. Qhov ntev yog feem ntau 18 ~ 36m, uas yog siv dav. Lwm hom steel trusses feem ntau siv cov chord steel trusses nrog cov qauv yooj yim (saib daim duab 1d, e, f thiab truss girder choj). Lub polygonal steel truss yog zoo stressed (Daim duab. 1g), tab sis nws manufacturing complex, thiab nws tsuas yog siv nyob rau hauv loj-span steel trusses. Lub pej thuam feem ntau siv cov duab ntawm txoj kab ncaj nraim los yog kab tawg (saib ntauwd qauv).

③ Nws tuaj yeem muab faib ua qhov zoo tib yam, hnyav thiab lub teeb steel trusses raws li lub zog sab hauv ntawm tus tswv cuab, ntu ntawm cov tswv cuab thiab cov yam ntxwv ntawm lub pob. Ordinary steel trusses feem ntau siv tib lub vev xaib, feem ntau T-zoo li seem uas muaj ob lub kaum sab xis steels, thiab qee zaum hla zoo li tus, qhov zoo li tus, lossis cov seem tubular. Lawv txuas nrog lub phaj gusset ntawm node, uas yog yooj yim hauv cov qauv thiab feem ntau siv. Heavy steel truss cov tswv cuab yog I-puab los yog lub thawv zoo li cov seem uas muaj cov hlau phaj los yog seem steels, thiab cov nodes yog txuas los ntawm ob qho tib si gusset daim hlau; Nws yog feem ntau siv rau steel trusses nrog loj spans thiab loads, xws li txuas hniav thiab ntev-span ru tsev. Lub teeb steel truss yog tsim los ntawm lub kaum sab xis me me, puag ncig steel lossis nyias-walled seem steel; Nodes tuaj yeem txuas nrog gusset daim hlau los yog txuas ncaj qha nrog cov tswv cuab; Nws yog tsuas yog siv rau ru tsev qauv ntawm me me span lub teeb ru tsev.