Structural Deflection Monitoring
(Real-Time Deflection & Bending)
Continuous measurement and monitoring of deflection and bending in beams, slabs, bridges and cantilevers — verifying actual deflections remain within IS 456 and IRC 112 design limits under service loading.
What is the Structural Deflection Monitoring?
The Structural Deflection Monitoring service measures real-time vertical deflections of structural members using LVDTs, wire potentiometers and robotic total stations. Deflection monitoring is essential for long-span structures, post-tensioned slabs, bridge girders and any member where span/depth ratios are critical.
At Global Lab, deflection monitoring systems are configured for both short-term load testing (single event) and long-term continuous monitoring (weeks to years). Live deflection data is compared against IS 456 span/250 serviceability limits and IRC 112 bridge deflection limits, with threshold alerts when limits are approached.
Structural Deflection Monitoring — Site Images
How the Structural Deflection Monitoring is Conducted
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1Sensor Location PlanLVDTs or wire pots positioned at mid-span, quarter-span and support locations.
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2Reference Frame SetupIndependent reference frame or survey benchmark established for all measurements.
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3Sensor InstallationLVDTs or wire potentiometers clamped to member with reference to fixed point.
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4Zero ReadingInitial reading taken before loading. Live load deflections recorded automatically.
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5IS 456 Assessment & ReportMaximum deflection vs IS 456 / IRC 112 limits assessed. NABL report issued.
Applicable Test Standards
| Standard | Title | Scope | Type |
|---|---|---|---|
| IS 456:2000 | Plain and Reinforced Concrete — Code of Practice (Deflection Limits) | Deflection Limits | Indian Standard |
| IRC 112 | Code of Practice for Concrete Road Bridges | Bridge Deflection | IRC |
| IS 875 | Code of Practice for Design Loads | Live Loads | Indian Standard |
| ACI 318 | Building Code Requirements for Structural Concrete | Deflection | ACI |