Dual-car centered loading
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Load Testing (Positive Load + Eccentric Load) of a Viaduct on the Xiangyang Inner Ring Road
Release time:
2026-03-23 16:39
Project Overview
To comprehensively evaluate the structural performance and safety margin of the bridge under various traffic loads, a combined static and eccentric-load test was conducted on this elevated bridge. Using non-contact visual measurement techniques, the deflection responses at critical locations of the structure were monitored throughout the entire loading process, thereby verifying the actual operational behavior of the structure under both symmetrical and asymmetrical loading conditions.
Technical Solution
- Adopts a high-precision optical measurement system (25 mm focal length).
- Utilize the existing texture of the bridge as measurement points, eliminating the need to affix targets.
- Multi-point synchronous monitoring, covering key locations on the order of 28–30 meters.
- Set reference points for data correction to enhance measurement stability.
- To be implemented in accordance with “JTG/T J21-01-2015 Code for Load Testing of Highway Bridges.”
Test conditions
Set up multi-level loading and unloading conditions to simulate actual traffic loads:
Normal operating condition:
Four-vehicle offset loading
Six-vehicle centralized loading
All six vehicles have been unloaded.
Unbalanced loading condition:
Three vehicles are loaded on the right side of the road, with a right-side offset load.
Load three vehicles, for a total of six, without centering or symmetry; all are biased to the right and unevenly loaded.
All six vehicles have been unloaded.
Test Results and Analysis
- The deflection curves at each measurement point are in excellent agreement with the theoretical calculations.
- Under normal operating conditions, the structural response is uniform and the stress distribution is reasonable.
- Under eccentric loading conditions, the differences in lateral deformation are evident, and the structure as a whole remains stable.
- After unloading, the structure exhibits good recovery with no abnormal residual deformation.
Project Value
✔ Single test completes dual-dimensional verification of axial load and eccentric load
✔ Comprehensive assessment of bridge load-carrying capacity and resistance to eccentric loading
✔ Non-contact measurement enhances inspection efficiency and safety
✔ Provides a reliable basis for bridge operation and maintenance decision-making
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