I-ASTM Insimbi Emise okwe-Hezaziwa nangokuthi izigaba zika-H noma imishayo ye-I, ziyimishayo yesakhiwo enesigaba esiphambanayo esifana nohlamvu oluthi “H.” Avame ukusetshenziswa kumaphrojekthi wokwakha kanye nobunjiniyela bomphakathi ukunikeza ukwesekwa nokuzinza kwezakhiwo ezifana nezakhiwo, amabhuloho, nezinye izingqalasizinda ezinkulu.
Ama-H-beams abonakala ngokuqina kwawo, amandla aphezulu okuthwala umthwalo, kanye nokuguquguquka, okuwenza afanelekele uhla olubanzi lwezinhlelo zokusebenza. Ukwakhiwa kwemishayo ye-H kuvumela ukusatshalaliswa okuphumelelayo kwesisindo namandla, okwenza kube yisinqumo esihle sokwakha izakhiwo ezinde.
Ukwengeza, imishayo ye-H ivame ukusetshenziswa ngokuhlanganiswa nezinye izakhi zokwakha ukuxhumana okuqinile nokusekela imithwalo esindayo. Ngokuvamile zenziwa ngensimbi noma ezinye izinsimbi, futhi ubukhulu bazo nobukhulu kungahluka kuye ngezidingo ezithile zephrojekthi.
Sekukonke, imishayo ye-H idlala indima ebalulekile ekwakhiweni kwesimanje nobunjiniyela, ihlinzeka ngosekelo olubalulekile nokuzinza kwezinhlelo zokusebenza ezahlukahlukene zezakhiwo nezimboni.