National Skyscraper Day.

0:03 Kalaroga Shark Media. Hi. I'm Mark Ellison. In today's theme is National Skyscraper Day, the world's tallest buildings, architectural wonders and engineering marbles. Question one. From its y shaped footprint to its record breaking pinnacle, the world's tallest building relies on a specific structural strategy that uses three wings to stiffen and buttress a central core. What is the name of this structural system employed by the Burj Khalifa? Question two. In Taipei, visitors can look up at a massive six hundred and sixty ton pendulum suspended near the top of a super tall that swings to counter typhoon winds and earthquakes.

0:47 What is this device called and which building famously displays it? Question three? Rising over Shanghai's Lujiazui district, which super tall skyscraper softens windloads with a one hundred and twenty degree spiral twist and a double skin glass facade designed to boost energy efficiency? Question four. When tallying the official height of skyscrapers, the Council on Tall Buildings and Urban Habitat counts one type of vertical extension but excludes the other under CTBUH rules. Which element counts toward architectural height, a spire or an antenna? Question five, often cited as the world's first skyscraper for its revolutionary metal frame, which eighteen eighty five Chicago building pioneered steel skeleton construction and paved the way for modern high rises. Will be right back with these answers after this break. Welcome back. Question one.

2:02 What structural system does the Burj Khalifa use? Answer the buttressed core skidmore owings and Meryl's design uses three wing like buttresses around a hexagonal core, letting the tower resist wind and gravity loads and reach eight hundred twenty eight meters. The approach was crucial to stabilizing such an extreme height. Question two, Name the device and the building that uses a six hundred and sixty ton swinging sphere to steady itself. Answer A tuned mass damper In Taipei one hundred and one TYPEI one hundred and one houses a six hundred and sixty metric ton tuned mass damper between its upper floors. By oscillating opposite the tower's sway, it reduces motion in storms and quakes. It's one of the few such dampers showcased to the public. Question three, Which Shanghai Tower has a one hundred and twenty degrees twist and a double skin facade? Answer Shanghai Tower at six hundred and thirty two meters. Shanghai Tower's rotated form reduces vortex shedding, while its two layer curtain wall improves insulation and ventilation. The design helps tame the wind and lowers energy use at China's tallest building. Question four CTBUH Height rules, Which count spire or antenna? Answer? A spire counts and antenna does not.

3:17 CTBUH includes permanent integral architectural features like spires, but excludes functional add on antennas. That's why One World Trade Center is ranked at one thousand, seven hundred and seventy six feet over Chicago's Willis Tower. Question five. What eighteen eighty five Chicago building is often called the first skyscraper? Answer the Home Insurance Building, Designed by William le Baron Jenny. The Home Insurance Building used a steel and iron frame to carry its weight, enabling greater height than load bearing masonry. Its innovation launched the era of true skyscrapers. That concludes today's five daily trivia questions. I'm Mark Ellison, and today's questions were crafted with the help of AI technology. See you tomorrow,