Views: 140 Author: Site Editor Publish Time: 2025-06-24 Origin: Site
Content Menu
● 1、 The Steel Ballet in the Wind
● 2、 Storm simulation in the laboratory
● 3、 Practical testing of super engineering
● 4、 Future Typhoon Defense System
When the super typhoon "fireworks" with a force of 16 swept across the East China Sea with rainstorm, the vehicles on the Zhoushan Sea Crossing Bridge still passed smoothly. Behind this incredible scene lies the "Sea God Needle" level wind resistant design of the steel box girder - how does it make the 10000 ton bridge as stable as a rock in strong winds? Today, we unveil the wind proof password of this "Made in China" project!
Traditional bridges are prone to deadly vortex vibrations during typhoons, while modern steel box girders resolve the threat of wind demons through three major "dance steps":
✓ Streamlined cross-section: The shuttle shaped design of the deep middle channel reduces wind pressure by 35%, and the drag coefficient is comparable to that of a fighter wing
✓ Wind duct array : 86 vent holes on the deck of the Hong Kong Zhuhai Macao Bridge, instantly decomposing the energy of the cyclone
✓ Adaptive Damper : The "Bridge Shock Absorber" installed on the Hangzhou Bay Bridge can counteract vibrations caused by level 12 winds
At the Wind Tunnel Laboratory of Southwest Jiaotong University, we witnessed the ultimate testing of steel box girders:
- 1:50 model withstands wind speeds of 80m/s equivalent to a Category 18 typhoon
- Laser displacement gauge displays a maximum swing of only 3.2 centimeters (safety standard is 15 centimeters)
-Pressure cloud map Reveals: Special nozzle design reduces bridge tower wind load by 42%
▶ Pingtan Strait Public Railway Bridge * (World Trend):
-Annual average of 200 days with strong winds above level 8
-Double layered steel box girder design sets a record for 'zero downtime'
▶ Qiongzhou Strait Cross Sea Passage (Typhoon Corridor):
-Detachable air deflector system
-During the resistance to Typhoon Talim in 2023, the lateral displacement of the bridge deck is less than 5cm
▶ Seto Inland Sea Bridge in Japan (Chinese technology export):
-Adopting the CFD wind resistance optimization scheme developed in China
-The critical wind speed for flutter has been increased to 89m/s (30% higher than the original Japanese design)
The sixth generation wind resistant technology currently under development includes:
• Intelligent wind farm warning : Bridge deck micro weather station+AI prediction, adjust damping parameters 30 minutes in advance
• Active Pneumatic Control : The deformable wing plate automatically changes the shape of the bridge body with wind speed
Nano coating: The surface of the bridge tower mimics the microstructure of shark skin, reducing the generation of eddy currents
From "swaying with the wind" to "not moving when smelling the wind", China's steel box girder technology has achieved:
The wind resistance level has been raised from level 12 to level 18
√ Control the amplitude of vortex vibration within 1/3 of the EU standard
√ Bridge traffic efficiency increases by 90% during typhoon season
This is not only the power of steel, but also the wisdom crystallization of Chinese engineers' dialogue with nature!
