Txawm hais tias ob qho tib si yog "C" - zoo li, lawv cov ntsiab lus ntawm qhov sib tshuam thiab lub zog ntawm cov qauv sib txawv heev, uas cuam tshuam ncaj qha rau lawv lub peev xwm thauj khoom thiab qhov ntau thiab tsawg ntawm kev siv.
Qhov seem ntawm C Channel yog ib qhokub - dov integral qauvNws lub vas (qhov ntsug ntawm "C") yog tuab (feem ntau yog 6mm - 16mm), thiab cov flanges (ob sab kab rov tav) dav thiab muaj qee qhov nqes hav (kom pab txhawb kev ua haujlwm kub-dov). Qhov kev tsim no ua rau qhov seem hla muaj zog tiv taus khoov thiab torsional rigidity. Piv txwv li, 10 # C Channel (nrog qhov siab ntawm 100mm) muaj lub vas tuab ntawm 5.3mm thiab flange dav ntawm 48mm, uas tuaj yeem yooj yim dais qhov hnyav ntawm cov plag tsev lossis phab ntsa hauv cov qauv tseem ceeb.
C Purlin, ntawm qhov tod tes, yog tsim los ntawm kev khoov txias ntawm cov hlau nyias nyias. Nws qhov seem yog "nyias dua": lub web thickness tsuas yog 1.5mm - 4mm, thiab cov flanges yog nqaim thiab feem ntau muaj cov quav me me (hu ua "reinforcing ribs") ntawm ntug. Cov reinforcing ribs no yog tsim los txhim kho qhov ruaj khov ntawm cov flanges nyias nyias thiab tiv thaiv kev hloov pauv hauv qab cov khoom me me. Txawm li cas los xij, vim yog cov khoom nyias nyias, qhov kev tiv thaiv torsional tag nrho ntawm C Purlin tsis muaj zog. Piv txwv li, ib qho C160 × 60 × 20 × 2.5 C Purlin (qhov siab × flange dav × web qhov siab × tuab) muaj tag nrho qhov hnyav tsuas yog li 5.5kg ib 'meter', uas yog sib dua li 10 # C Channel (kwv yees li 12.7kg ib 'meter').
