FLAWED ASSUMPTIONS: WHY BRIDGE DECK JOINTS FAIL

This article notes that engineering is based on assumptions, and describes how loads, forces, distortions, sizes, material strength, construction methods, mathematical givens, scientific concepts, and human capabilities, all require realistic predictions. It points out what happens when some assumptions are flawed. Engineers should continually examine, evaluate and improve their representations of reality to avoid basing their beliefs, decisions, practices and policies on flawed assumptions. Such assumptions, not necessarily the devices themselves, are responsible for the failure of bridge deck joints. When considering the poor performance and failure of designs, primary attention should be focused on the human element. Improving performance that area is one of the most effective ways to achieve improved concepts, details, sepcifications, policies and bridge longevity.