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.
Las fallas estructurales eran las mismas: paredes y losas no encolumnadas apropiadamente; esa losa del techo cuelga del edificio; estructuras voladizas, o estructuras asimétricas, que se sacudieron violentamente y cayeron; malos materiales de construcción; el hormigón no era suficiente; la compresión de los bloques no era suficiente; barras de refuerzo lisas; barras de refuerzo expuestas a la intemperie y oxidadas.