Why Do Bridges Move? The Hidden Engineering Behind Expansion Joints

Have you ever noticed the gaps in a bridge and wondered why they are there? Bridges may look completely rigid, but they are designed to move. In this BUILTWISE documentary, we explore the hidden engineering behind bridge movement and expansion joints. You’ll see how temperature changes, traffic loads, concrete behavior, structural rotation, foundation movement and other factors can affect a bridge. We’ll explore: • Why bridges expand and contract • How temperature affects bridge structures • What expansion joints actually do • How bridge bearings allow controlled movement • How engineers design for structural movement • What can happen when movement is not properly accommodated • Why drainage and maintenance matter • How some bridges reduce or eliminate conventional expansion joints • How engineers inspect joints and bearings The next time you drive across a bridge, look down. That gap in the pavement is part of a much bigger engineering system. BUILTWISE explores the engineering, construction, architecture and science behind buildings, bridges, infrastructure and structures. If you want to understand how buildings, bridges, and structures really work, subscribe to BUILTWISE. #BridgeEngineering #ExpansionJoints #CivilEngineering #StructuralEngineering #BUILTWISE