Cov hluav taws kub hnyiab yuav tsum tau tiv thaiv hauv lub neej niaj hnub, thiab qhov rooj hluav taws kuj tau dhau los ua kev xaiv ntawm ntau tus neeg. Steel qhov rooj hluav taws yog ib qho kev sib txuas ntawm cov ncej steel thiab steel qhov rooj kiv cua. Cov qauv hlau tuaj yeem ua kom tsis yooj yim rau kev cuam tshuam deformation, tsis yooj yim rau kev puas tsuaj los ntawm sab nraud quab yuam, tuaj yeem siv rau lub sijhawm ntev yam tsis hloov.

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