In October 2023, A2Z JSC. and Dai Phong JSC. received international recognition by successfully conducting wind tunnel tests for a cable-stayed bridge with a main span exceeding 450 meters. This bridge features the longest composite steel girder cable-stayed system in Vietnam, and was achieved in collaboration with SOH – a leading international company in bridge aerodynamics in Denmark.
- Aerodynamic stability – A crucial requirement in large-span bridge design
For cable-stayed bridges with main spans longer than 400 meters, aerodynamic testing is a critical factor in structural design. Wind-induced phenomena such as Vortex-Induced Vibrations (VIV), buffeting from turbulent flow, and aeroelastic resonance can significantly reduce structural stability and impact operational safety.
Recognizing these crucial factors, A2Z proactively partnered with SOH to conduct wind tunnel tests on a scaled sectional model of the bridge deck. The tests were evaluated according to international design standards, including those applied in Japan, Korea, and Europe.
The testing process employed high-precision measuring equipment—non-contact vibration sensors, high-frequency data acquisition systems, and advanced flow visualization techniques—to assess VIV response, random oscillation behavior, and aerodynamic stability under transverse wind loads.
The A2Z delegation observes the 2D model experiment at SOH headquarters – Copenhagen (Denmark)
The results confirm that the aerodynamic performance of the bridge section is within internationally accepted safety thresholds. This provides a solid foundation for subsequent detailed design phases, ensuring the safe construction and long-term performance of the actual structure.
- Wind tunnel testing in Europe – High-precision data for large-span bridge design
A physical model of the bridge section was constructed to scale, incorporating advanced measurement systems such as non-contact vibration sensors and high-resolution velocity probes. The testing program utilized a high-frequency data acquisition system (300–500 Hz) to evaluate crucial parameters, including:
– Vortex-Induced Vibrations (VIV)
– Random oscillations in turbulent flow conditions
– The impact of transverse wind on the aerodynamic stability of the bridge section.
The data obtained meets the most stringent international standards, providing a robust basis for verifying aerodynamic efficiency before moving into the detailed engineering design phase.
The 3D model of Dai Ngai 1 cable-stayed bridge used in wind tunnel test
- A solid foundation for technical design implementation
The aerodynamic test results have confirmed that the bridge model achieved high stability under wind loads, with all oscillation amplitudes falling within international safety limits. This provides a crucial basis for the A2Z engineering team to proceed with the detailed technical design phase, ensuring the safe construction and long-term operation of the actual structure.
- This achievement goes beyond a typical technical assessment:
– It helps bring bridge design consulting processes in Vietnam closer to global standards.
– It affirms the leading technical capabilities in large-span cable-stayed bridge projects of A2Z.
– It serves as a testament to the effectiveness of international cooperation and the application of advanced testing technology to achieve sustainable project performance.
🤝 Looking for a reliable partner for large-span bridge design?
If your project requires in-depth aerodynamic analysis, Vortex-Induced Vibrations (VIV) control, and assurance of structural stability in complex environmental conditions, A2Z is ready to collaborate with you.
We specialize in providing technical consulting solutions for national-scale infrastructure projects, where precise engineering meets a global vision.
By: Vu Lan Huong; Translation: Quang Anh
