How Ancient China Built a 605 AD Limestone Bridge Without Central Piers

How did an ancient Chinese engineer build a limestone bridge that has survived for nearly 1,400 years, without central piers? The answer lies in four carefully placed openings, a remarkably shallow arch, and the bold decision to remove roughly 700 tons of masonry where other builders would have added more. This video explores how the bridge was designed to let floodwater pass through instead of resisting it, how 28 independent ribs share the load, what lies beneath its foundations, and why its structure endured catastrophic floods, wars, maintenance challenges, and a powerful earthquake. It’s a story of engineering insight, and the courage to understand that sometimes, the strongest bridge is the one with less stone. 0:00 The bridge that lost stone 0:49 The flood problem 1:54 One arch, no piers 2:22 The shallow arch problem 4:02 A bridge that lets floods through 5:10 Twenty-eight independent ribs 6:25 What lies beneath the bridge 7:09 Fourteen centuries of maintenance 7:34 The earthquake test 8:01 A prototype ahead of the West 8:24 The courage to remove stone #AncientEngineering #ChineseHistory #BridgeEngineering #Architecture #CivilEngineering