Trusses Txuag khoom thiab txo qhov hnyav ntawm cov qauv

Truss (héng) thav duab (jià) (truss): Ib qho qauv uas cov rods txuas rau ib leeg los ntawm cov pob khawm ntawm ob qho kawg. Lub truss yog tsim los ntawm cov pas nrig ncaj thiab feem ntau muaj lub dav hlau lossis qhov chaw nrog cov duab peb sab. Cov truss rods mas dais axial nro lossis siab, kom lub zog ntawm cov khoom siv tau tag nrho. Thaum qhov loj me me, cov khoom siv tau txais kev cawmdim piv nrog cov khoom siv hauv web beam, thiab qhov hnyav ntawm tus kheej thiab qhov hnyav tuaj yeem txo. Ua kom nruj.

Lo lus "truss" yog pronounced "héng". Vim tias lo lus "truss" tsis tshua siv, nws yuam kev hais tias "háng" (kab). Lub ntsiab lus ntawm truss: Ib qho kev txhawb nqa nqaj tsim los ntawm vuam, riveting lossis bolting ntawm rods yog hu ua "truss".

Qhov kom zoo dua ntawm truss yog tias cov pas nrig feem ntau dais nro lossis siab, uas tuaj yeem muab tag nrho kev ua si rau lub luag haujlwm ntawm cov ntaub ntawv, txuag cov ntaub ntawv thiab txo qhov hnyav ntawm cov qauv. Feem ntau siv yog steel truss, reinforced qhob truss, prestressed qhob truss, ntoo truss, steel thiab ntoo composite truss, steel thiab pob zeb ua ke truss.

Lub truss yog cov qauv geometrically invariant tsim los ntawm daim duab peb sab thav duab tsim los ntawm cov pas nrig ncaj. Cov pob qij txha ntawm cov tswv cuab hu ua nodes (los yog nodes). Raws li cov axis ntawm cov tswv cuab truss thiab kev faib tawm ntawm lub zog sab nraud, lub truss tuaj yeem muab faib ua dav hlau truss thiab qhov chaw truss. Spatial lug xws li ru tsev trusses los yog txuas hniav yog tsim los ntawm ib tug series ntawm parallel dav hlau trusses. Yog tias lawv tsuas yog dais dav hlau thauj khoom, lawv tuaj yeem yooj yim ua lub dav hlau trusses rau kev xam.

Lub axis ntawm cov tswv cuab uas tsim cov truss thiab lub zog sab nraud yog nyob rau tib lub dav hlau. Planar trusses tuaj yeem xav tias yog ntxiv cov tswv cuab rau ib qho yooj yim daim duab peb sab. Rau txhua ob lub pas nrig ntxiv, yuav tsum tau tsim ib lub pob tshiab kom lub geometry ntawm cov qauv tseem zoo li qub. Hom truss uas muaj peev xwm tswj tau geometric solidity yog hu ua ib tug pas nrig (los yog tsis redundant pas nrig) ​​truss. Yog tias koj tsuas ntxiv cov tswv cuab yam tsis tau ntxiv cov nodes, koj tuaj yeem tswj tsis tau qhov geometric robustness ntawm lub truss, uas yog hu ua redundant (los yog redundant) truss.