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.
问题的根源是相同的-- 墙和楼板之间没有用柱子正确的连接起来-- 这是挂在建筑上的天台楼板-- 悬臂式结构， 或是非对称结构， 剧烈摇晃并垮塌， 低劣的建筑材料， 没有足够的混凝土， 块与块之间没有足够的压缩空间， 螺纹钢表面光滑， 螺纹钢暴露在空气中并已经生锈了。