umkhuhlane wemali wezi-1 wesintathu
I-I-beam yensimbi engagqwali iyisici esibalulekile ekwakhiweni nasekwakhiweni kwanamuhla, ihlanganisa ukuqina kwensimbi engagqwali nomklamo osebenza kahle we-I-shaped cross-section. Lesi sakhi esihlukahlukene sinezixhumi ezihambisanayo ezixhunywe ngombhobho ovundlile, okudala iphrofayili ekhulisa amandla ngenkathi inciphisa ukusetshenziswa kwezinto. Ukwakheka kwensimbi engagqwali kunikeza ukumelana nokugqwala okuphezulu, okwenza kube kuhle ekusetshenzisweni ezindaweni ezinzima njengasogwini, izikhungo zokucubungula amakhemikhali nezitshalo zokulungisa ukudla. Umklamo womgodi uhlukanisa imithwalo kahle phakathi kwesigaba sawo, unikeza ukusekela okuhlukile kokubili amandla okucindezela nawokucindezela. Lezi zinhlaka zenziwa ngokuya ngemininingwane eqondile, ngokuvamile zitholakala ngamanani ahlukahlukene wensimbi engagqwali, kuhlanganise no-304 no-316, ngayinye enikeza izinzuzo ezithile zokusetshenziswa okuhlukile. Ukuqina kwezilinganiso nokuma okuphezulu kwesisindo kuya emandleni kwenza izinsimbi ezenziwe ngensimbi engagqwali I zibaluleke ngokukhethekile emisebenzini yokwakha lapho kuthinteka khona imingcele emide nemithwalo emikhulu. Izakhiwo zazo ezingenawo amandla kazibuthe nokumelana nokushisa okweqile kwandisa ukusetshenziswa kwazo kabanzi ekusetshenzisweni kwezimboni ezikhethekile.