Nakuba womabili "C" - anomumo, imininingwane yawo yesigaba esiphambanayo namandla esakhiwo ahluke kakhulu, okuthinta ngqo umthwalo wawo - amandla okuthwala kanye nobubanzi bokusebenza.

Ingxenye yesiphambano se-C Channel iyi-ahot - rolling ebalulekile isakhiwo. Iwebhu yayo (ingxenye eqondile ye "C") iwugqinsi (imvamisa i-6mm - 16mm), futhi ama-flanges (izinhlangothi ezimbili ezivundlile) abanzi futhi anomthambeka othile (ukwenza kube lula ukucubungula okushisayo). Lo mklamo wenza ingxenye yesiphambano ibe nokugoba okuqinile nokuqina kwe-torsional. Isibonelo, iShaneli engu-10# C (enobude obungu-100mm) inogqinsi lwewebhu obungu-5.3mm nobubanzi be-flange obungu-48mm, obungakwazi ukuthwala kalula isisindo sephansi noma izindonga esakhiweni esikhulu.

I-C Purlin, ngakolunye uhlangothi, yenziwa ukugoba okubandayo kwamapuleti ensimbi amancane. I-cross - section yayo "incane" kakhulu: ubukhulu bewebhu buyi-1.5mm - 4mm kuphela, futhi ama-flanges amancane futhi ngokuvamile anemigoqo emincane (okuthiwa "izimbambo eziqinisayo") emaphethelweni. Lezi zimbambo eziqinisayo zenzelwe ukuthuthukisa ukuzinza kwendawo yama-flange amancane futhi kuvimbele ukuguquguquka ngaphansi kwemithwalo emincane. Kodwa-ke, ngenxa yempahla emincane, ukumelana okuphelele kwe-torsional kwe-C Purlin kubuthakathaka. Isibonelo, i-C160×60×20×2.5 C ejwayelekile i-Purlin (ubude × ububanzi be-flange × ukuphakama kwewebhu × ukujiya) inesisindo esiphelele esingaba ngu-5.5kg imitha, elula kakhulu kuno-10# C Channel (cishe u-12.7kg imitha).