The failure points were the same: walls and slabs not tied properly into columns -- that's a roof slab hanging off the building -- cantilevered structures, or structures that were asymmetric, that shook violently and came down, poor building materials, not enough concrete, not enough compression in the blocks, rebar that was smooth, rebar that was exposed to the weather and had rusted away.
Os pontos de falha foram os mesmos -- paredes e lajes não presas de maneira correcta a colunas -- esta é a laje de um telhado pendurada num edifício -- estruturas feitas de vigas suspensas, ou estruturas assimétricas, que abanaram violentamente e caíram, maus materiais de construção, falta de betão, falta de compressão nos blocos, varões lisos, varões expostos ao ambiente que tinham enferrujado.