I-beams tau dav siv hauv kev tsim kho kev lag luam thiab muaj nyob rau hauv ntau qhov ntau thiab tsawg. Cov ntxhuav muaj los tso cai yooj yim xaiv ntawm qhov haum steel I-beam loj rau ib qho kev thov. I-beams yuav siv tau ob qho tib si raws li kab teeb thiab kab.
I-beams yuav siv tau ob leeg ntawm lawv tus kheej, los yog ua ke nrog lwm cov khoom, feem ntau yog pob zeb. Kev tsim qauv yuav raug tswj hwm los ntawm ib qho ntawm cov qauv hauv qab no:
deflection: qhov tawv ntawm I-beam yuav raug xaiv kom txo qis deformation
kev vibration: qhov tawv thiab loj yog xaiv los tiv thaiv kev co tsis tuaj yeem, tshwj xeeb tshaj yog nyob rau hauv cov chaw muaj kev vibrations, xws li chaw ua haujlwm thiab tsev qiv ntawv
dabtsi yog khoov tsis ua hauj lwm los ntawm yielding: qhov twg cov kev ntxhov siab nyob rau hauv tus ntoo khaub lig seem tshaj qhov yield stress
dabtsi yog khoov tsis ua hauj lwm los ntawm sab torsional buckling: qhov twg ib tug flange nyob rau hauv compression nyhav rau buckle sideways los yog tag nrho cov cross-section buckles torsionally
dabtsi yog khoov tsis ua hauj lwm los ntawm lub zos buckling: qhov twg lub flange los yog lub web yog li slender li buckle hauv zos
Local yield: tshwm sim los ntawm cov concentrated loads, xws li ntawm lub beam qhov taw tes ntawm kev txhawb nqa
shear tsis ua haujlwm: qhov twg lub vev xaib tsis ua haujlwm. Slender webs yuav poob los ntawm buckling, rippling nyob rau hauv ib tug phenomenon termedtension field action, tab sis shear tsis ua hauj lwm kuj resisted los ntawm qhov nruj ntawm flanges
buckling lossis yielding ntawm cov khoom: piv txwv li, ntawm stiffeners siv los muab kev ruaj ntseg rau I-beam lub vev xaib.
Teeb meem
Txawm hais tias I-beams zoo heev rau unidirectional dabtsi yog khoov nyob rau hauv ib lub dav hlau thaum uas tig mus rau lub web, lawv tsis ua zoo li bidirectional dabtsi yog khoov. Cov kab teeb no kuj qhia me ntsis tsis kam rau twisting thiab undergo sectional warping nyob rau hauv torsional loading. Rau torsion dominated teeb meem, lub thawv beams thiab lwm yam ntawm cov seem txhav yog siv nyob rau hauv nyiam rau I-beam.
