31378403[spanning and projecting structural elements]PT2026-03-30 20:42:05BT31348506structural elementsPTNT31414627beamsPTNT31414629cantileversPTNT31414631lintelsPTNT31414635bracketsPTNT31414637corbelsPTNT31414641[arches and arch components]PTNT31414642[entablatures and entablature components]PTNT31414643[trusses and truss components]PTNT31414644deckingPTNT31414647spansPTNT31414649pūzuòPTNT31414650tiǎowòPTNT31414651shàng'ángPT