Bridge Load Testing is a structural assessment method used to verify the load-carrying capacity, structural behaviour, and performance of bridges, flyovers, and viaducts under controlled test loads. It is performed both for proof testing of newly constructed structures and for evaluation of existing/ageing bridges.
In India, bridge load testing is governed by IRC SP-51 — "Guidelines for Load Testing of Bridges" published by the Indian Roads Congress. The test verifies that deflections and residual deformations remain within permissible limits under specified loading conditions.
Proof Load Testing
Applied to newly constructed bridges before commissioning to validate design assumptions and workmanship. Test load typically equals 1.0–1.25× the design live load arranged in worst-case positions.
Diagnostic Load Testing
Performed on existing bridges to assess residual load capacity, identify structural deficiencies, and support rehabilitation decisions. Instrumentation records real-time structural response.
Metro Viaduct Testing
Specialized testing for elevated metro rail viaducts using rolling stock or calibrated precast block loading. Deflection, camber recovery, and crack monitoring are performed at each load stage.
Acceptance Criteria
Maximum deflection ≤ L/800 of span. Residual deflection after removal of load ≤ 25% of maximum deflection. No new cracks or crack width ≤ permissible as per IS 456 / IRC 112.
| Scope of Laboratory — Bridge Load Testing & Non-Destructive Testing Services | ||||
| S.No | Discipline / Group | Materials or Products Tested | Component, Parameter or Characteristic Tested / Specific Test Performed | Test Method Specification / Technique / Equipment Used |
|---|---|---|---|---|
| 1 | Non-Destructive Building Materials — Reinforced Concrete Structures |
Bituminous and Concrete Section — Bridge | Load Testing Static & Dynamic load test; deflection measurement; crack monitoring; residual deformation assessment; camber recovery observation |
IRC SP-51 Indian Roads Congress Guidelines for Load Testing of Bridges |
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