Quake-Proof Bridge | National Geographic

TL;DR

Akashi Bridge withstands earthquakes with innovative technology, proving strength in challenging environments.

Transcript

the unstable ground makes Japan The Last Place on Earth an engineer would choose to build the world's longest suspension bridge if the ground beneath a suspension bridge is shaken by an earthquake we could in the worst case for example get a tower toppling over obviously a catastrophic event the first line of defense against an earthquake is the Br... Read More

Key Insights

• 🌍 The Akashi Bridge in Japan is the world's longest and tallest suspension bridge, designed to withstand earthquakes.
• 🗼 Innovative engineering features, such as flexible steel towers and hydraulic dampers, protect the bridge from seismic activities.
• 😀 Despite facing a devastating earthquake in 1995, the Akashi Bridge survived, showcasing the effectiveness of its design.
• 🌉 The bridge's resilience during natural disasters demonstrates the importance of incorporating earthquake-resistant technology in infrastructure projects.
• 🧑‍⚕️ Engineers conduct testing to ensure the effectiveness of the dampers by simulating earthquake movements with choreographed workers.
• ❓ The Akashi Bridge's ability to survive and remain operational after earthquakes highlights the success of over two centuries of engineering innovation.
• 🏛️ Building structures in earthquake-prone areas requires innovative designs and technology to ensure safety and longevity.

Questions & Answers

Q: How does the Akashi Bridge protect itself against earthquakes?

The bridge's steel towers are flexible and equipped with 20 dampers inside each tower, which counteract shifts caused by tremors, preventing tower collapse.

Q: What testing methods are used to ensure the effectiveness of the dampers?

Engineers conduct man-made tremors by choreographing workers to sway, mimicking earthquake movements to test how the dampers react and keep the bridge steady.

Q: How did the Akashi Bridge fare during the 1995 Kobe earthquake?

The bridge survived the magnitude 7 earthquake, saving thousands of lives and buildings due to its dampers that prevented tower collapse despite the ground shifting.

Q: What was the impact of the 1995 earthquake on the Akashi Bridge?

The quake caused the bridge and ground to shift, stretching the bridge by over 3 feet, leading engineers to add extra decking to join it to the shoreline.

Summary & Key Takeaways

• The Akashi Bridge in Japan is the world's longest suspension bridge, built with earthquake-resistant features.

• The bridge's steel towers are flexible to absorb tremors, with 20 dampers inside each tower for added protection.

• Despite facing a devastating earthquake in 1995, the Akashi Bridge survived, showcasing its resilient design.