SYSTRA MVA Consulting India Pvt Ltd
04 - 10 Jun 2026
Bearing Restraint Strategy – Longitudinal Behaviour
Estimated Time: 2–3 min | Difficulty: Intermediate
Question
In a multi-span continuous bridge without seismic isolation, what most strongly influences the location of the primary fixed bearing?
Explanation
Fixed bearings are typically positioned near the geometric centre of a bridge to minimize cumulative thermal expansion and contraction in either direction.
Placing the global point of fixity centrally reduces total longitudinal displacement demand and limits thermally induced forces in substructure elements. Longitudinal loads such as wind and braking are then distributed according to pier stiffness (if there are more than one fixed piers), but thermal movement is usually the dominant driver in fixity location for non-isolated bridges.
Learning Resources