Cov khau khiav yog cov khoom siv feem ntau siv hauv kev ua vaj tsev lossis tshuab. Nws feem ntau heas ib qho tuab thiab lub zog thiab yog ua los ntawm cov ntaub ntawv tshwj xeeb. Lub npe ntawm peb-ribbed phaj yuav muab tau los ntawm nws cov qauv tsim tshwj xeeb. Tej zaum nws yuav muaj peb txoj hlua khi los yog muaj cov yam ntxwv zoo nkauj. Nws tuaj yeem siv rau kev txhim kho cov qauv, bearing loads, los yog ua hauj lwm raws li partitions. Hauv cov xwm txheej sib txawv, qhov tshwj xeeb thiab kev ua haujlwm ntawm peb-ribbed phaj yuav txawv.