Lub kaum sab xis ntawm Z-shaped purlin yog txawv ntawm C-shaped purlin. C-zoo li tus purlin yog 90 degrees, thiab Z-zoo li tus purlin yog tsawg tshaj li 90 degrees, txog 60 mus rau 75 degrees. Yog li ntawd, thaum siv purlins rau lub ru tsev nrog ib qho kev nqes hav, lub kaum sab xis ntawm purlins yuav tsum tau txiav txim siab nyob rau hauv ua ke nrog nrog kev nyuaj siab kev paub. Txais Z-shaped purlins rau qhov chaw loj tuaj yeem siv tag nrho nws txoj kev khoov.
Piv nrog rau Z-section, txhua yam khoom ntawm lub cev muaj zog thiab tsis muaj zog axes ntawm C-section yog qhov sib txawv heev, thiab kev sib txuas nrog cov thav duab nruj yog feem ntau bolt pob khawm, uas yuav tsum tau suav tias yog kev txhawb nqa yooj yim (kev sib txuas ntawm cov khoom sib txuas ntawm cov khoom sib txuas. z-sections tuaj yeem pom tau los ntawm kev txhim khu kev qha, yog li nws tuaj yeem suav tau raws li cov nqaj txuas ntxiv). Yog li ntawd, tom kawg yog qhov tsim nyog ntau dua los ntawm qhov kev xav ntawm lub xeev kev ntxhov siab, kev suav cov txiaj ntsig thiab cov qauv. Yog li ntawd, ntxiv rau cov kev xav tau ntawm lub qhov rooj thiab qhov rais qhib thiab lwm yam tshwj xeeb nodes, Z-zoo li tus seem yuav tsum tau xaiv dua. Phab ntsa purlins thiab ru tsev purlins nrog txoj kab nqes me me tuaj yeem ua C-puab; Lub ru tsev purlin nrog txoj kab nqes loj yuav tsum yog Z-puab, thiab nws yog qhov zoo dua los ua kom lub zog ntawm lub ru tsev thauj khoom hla mus rau seem centroid ntawm Z-puab purlin.
1) Thaum lub ru tsev txoj kab nqes me me, qhov khoov seem modulus ntawm Z-hom purlin yog me ntsis loj dua li ntawm C-hom purlin, tab sis qhov txawv tsis tseem ceeb; Thaum lub ru tsev txoj kab nqes nce, qhov kev siv piv ntawm qhov khoov seem modulus ntawm Z-shaped purlin symmetrical mus rau ntsug kev taw qhia nce. Yog li ntawd, Z-shaped purlins yog tsim rau ru tsev nrog cov nqes hav loj;
2) Rau phab ntsa, tsis muaj qhov sib txawv loj hauv kev xaiv Z-hom lossis C-hom;
3) Yog hais tias lub purlin yuav tsum tau ua nyob rau hauv ib tug tas mus li tus tswv cuab, qhov zoo tshaj plaws yog Z-puab purlin, vim hais tias nws yog ib qho yooj yim mus overlap.