ᎯᎠ ᎬᏂᎨᏒ ᎢᎬᏁᏗ ᎠᏍᏆᏗᏏᏐᏗ Ꮎ ᎯᎠ ᎬᏩᎪᎲᏍᏗ ᏂᎨᏒᎾ ᎾᎿ ᎯᎠ ᏗᏂᎳᏫ ᏂᎬᎢ' ᎠᏥᎸ ᏔᎷᎩᏍᎩ infrastructures ᏥᏄᏍᏛᎩ ᎤᏃᎸᏔᏅ ᎤᏣᏘᎾ ᎾᎥᎢ ᎯᎠ ᎠᎴᏅᏘᏍᎬ ᏓᏓᏛᎾᏍᏗᏍᎬ ᎯᎠ ᎦᏃᎯᎵᏙ ᎠᎴ Ꮎ, ᎢᏳᏃ ᎪᎯ ᎠᏰᎲ ᎾᏍᎩ ᏂᎨᏒᎾ ᏄᎵᏍᏔᏅᎩ, ᎯᎠ ᏂᎬᎢ ᏯᏓᎢᏗᏏ ᏄᏓᎷᎸᎾ ᎤᎭ ᏂᎦᏰᏙᎲᏊ ᎠᏂᏙᎾᎥ. ᎯᎠ ᎠᏥᎸ ᎥᏳᎩ ᎯᎠ trusses ᎠᎵᏍᏕᎸᏗ ᎯᎠ ᎠᏯᏖᏃᎯ, ᎠᏃᏢᏍᎬ ᎯᎠ ᎠᏯᏖᏃᎯ ᎤᏃᏴᏨ. ᎯᎠ sagging ᎠᏯᏖᏃᎯ ᎤᎾᏌᏁᏒ ᎾᎿ ᎯᎠ ᏙᏯᏗᏢ ᎠᏥᎸ ᏔᎷᎩᏍᎩ ᏚᏓᏅᏅ ᎯᎠ ᎪᏍᏓᏱ ᎭᏢᏃ ᏙᏯᏗᏢ ᏚᏓᏅᏅ ᎠᏗᏌᏓᏗᏍᏗ ᎢᎦᏛ. ᎬᏙᏗ ᎯᎠ ᎤᏲᏨᎯ ᎯᎠ ᎠᏰᎵ ᏚᏓᏅᏅ, ᎯᎠ buckling ᏙᏯᏗᏢ ᏚᏓᏅᏅ ᏰᎵᏇ Ꮭ ᎦᏅᎯᏓᎨ ᎠᎵᏍᏕᎸᏗ ᎯᎠ ᏓᏓᏁᎸ, causing ᎠᏂ ᏰᎵ ᏄᎵᏂᎬᎬᎾ. ᎭᏫᎾᏗᏢ ᎦᏟᏐᏗᎩ, ᎯᎠ ᎬᏂᎨᏒ ᎢᎬᏁᏗ ᎧᏁᎢᏍᏗᏱ Ꮎ ᎯᎠ ᏂᎬᎢ' stairwells ᎨᏒᎩ ᎾᏍᎩ ᏂᎨᏒᎾ eligwa igai reinforced ᎠᏓᏁᎳᏁᏗ ᎤᎢᏍᏓ ᎢᎦᎵᏍᏗᏍᎩ ᏗᏓᎩᏯᏍᏗ ᎾᏍᎩᎾᎢ ᏴᏫ ᎦᎸᎳᏗᏢ ᎯᎠ ᏓᏓᏛᎾᏍᏗᏍᎬ ᎡᎶᎯ ᎠᏍᏓᏅᏅ. NIST ᎤᏃᎮᎸᎩ Ꮎ ᎯᎠ ᏭᎵᏍᏆᏙᏅ ᎬᏂᎨᏒ ᎢᎬᏁᏗ ᎾᎿ ᎯᎠ ᏰᎵ ᏄᎵᏂᎬᎬᎾ 7 WTC ᏫᎵ ᎦᎾᏄᎪᎢᏍᏗ ᎭᏫᎾᏗᏢ ᏧᏓᎴᎿᎢ ᎬᏂᎨᏒ ᎢᎬᏁᏗ.