Although each of the notable failures involved a different type of bridge, in no case was the structure radically new. Each used technology that engineers had been confidently employing for bridges, and for which the assumed loads and methods of analysis were well established.
尽管这些著名事故中涉及的桥梁类型有所不同，但任何结构都不是全新采用的。所有大桥都采用了令设计人员充满信心的造桥技术，其预计载荷及分析方法都经过了时间的考验。每次事故中，工程师们都相信自己不过将现有的成功技术加以发展。