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Application of quick group search optimizer with passive congregation algorithm in cable force optimization of
Guang Qin1, Liangbo Wang2, Zhan Wu2
1Foshan Road and Bridge Supervision Station Corporation Limited, Foshan, 528313, China. qinguang1984@163.com.
Scientific Reports
|March 10, 2026
Summary
A new optimization algorithm, Quick Group Search Optimizer with Passive Congregation (QGSOPC), significantly reduces structural displacement and bending moments in long-span cable-stayed bridges. This method achieves a more stable "straight-tower & level-beam" state efficiently.
Area of Science:
- Structural Engineering
- Computational Mechanics
- Optimization Algorithms
Background:
- Cable-stayed bridges are critical infrastructure requiring precise structural control.
- Optimizing cable forces is essential for managing displacement and bending moments.
- Existing methods may not fully address the complexities of large-scale bridge structures.
Purpose of the Study:
- To introduce and evaluate the Quick Group Search Optimizer with Passive Congregation (QGSOPC) for cable force optimization.
- To assess the effectiveness of QGSOPC in improving the structural performance of a completed cable-stayed bridge.
- To demonstrate a practical and efficient tool for achieving optimal structural states in long-span bridges.
Main Methods:
- Application of the Quick Group Search Optimizer with Passive Congregation (QGSOPC).
- Integration with the influence-matrix method for cable force optimization.
- Comparative analysis against the original design and the standard GSO algorithm.
Main Results:
- QGSOPC reduced maximum tower-top displacement by 83.8% (84.1 to 13.6 mm).
- Girder deflection decreased by 41.9% (236.7 to 137.5 mm), and peak bending moment by 11% (118,078 to 105,120 kN·m).
- The composite objective function was lowered by 40.7%, confirming QGSOPC's superior performance.
Conclusions:
- QGSOPC provides a highly effective method for optimizing cable forces in long-span cable-stayed bridges.
- The algorithm successfully achieves the desired 'straight-tower & level-beam' structural state.
- QGSOPC presents a practical and efficient solution for enhancing bridge structural integrity and performance.
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