Designing ultra-efficient elevators to go faster and higher is only one of several challenges facing the builders of ever taller towers. As they reach for the sky, other obstacles include:
Wind
Turbulence increases at higher altitudes, exerting huge pressure on buildings. Super-tall towers already sway to compensate. But they can only move slightly before people inside the building start to feel the movement. Engineers are constantly working to reduce wind resistance. Water tanks also help dampen movement.
Plumbing
Moving water and sewage around super-tall towers creates a variety of challenges. Behind the sheer volume of pipes, nobody wants to hear water rushing through the building. Designs typically include curves and various holding tanks to slow the flow.
Cement
Most of the super-tall buildings in the Gulf are built with cement. But getting cement to great heights quickly and efficiently is not easy. Among other records, Dubai's Burj Khalifa, the tallest building in the world, set a new standard for pumping cement to altitude.
Electrical
Tall buildings require kilometres of complicated wiring. The length of the systems is not necessarily a problem, but the bulk becomes a critical issue. Space must be found to run the wires and pipes and that takes away from usable space, which is at a premium in super-tall towers.
Fire safety
The 9/11 attacks on the World Trade Center towers provided vivid evidence of the horrors involved in trying to emergency evacuate very tall buildings. The tragedy brought safety to the forefront and helped to spur a rethink of strategies. Typically people are told to avoid lifts in an emergency. But new systems call for elevators to bring people to safe areas on different floors and to additional escape routes.
Finances
Buildings grow more expensive as they rise. But developers have compensated by building larger projects on the ground floors and charging more for land and projects around super-tall towers.
* Kevin Brass
Greatest of All Time
Starring: Vijay, Sneha, Prashanth, Prabhu Deva, Mohan
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Results
- Brock Lesnar retained the WWE Universal title against Roman Reigns
- Braun Strowman and Nicolas won the Raw Tag Team titles against Sheamus and Cesaro
- AJ Styles retained the WWE World Heavyweight title against Shinsuke Nakamura
- Nia Jax won the Raw Women’s title against Alexa Bliss
- Daniel Bryan and Shane McMahon beat Kevin Owens and Sami Zayn
- The Undertaker beat John Cena
- The Bludgeon Brothers won the SmackDown Tag Team titles against the Usos and New Day
- Ronda Rousey and Kurt Angle beat Triple H and Stephanie McMahon
- Jinder Mahal won the United States title against Randy Orton, Rusev and Bobby Roode
- Charlotte retained the SmackDown Women’s title against Asuka
- Seth Rollins won the Intercontinental title against The Miz and Finn Balor
- Naomi won the first WrestleMania Women’s Battle Royal
- Cedric Alexander won the vacant Cruiserweight title against Mustafa Ali
- Matt Hardy won the Andre the Giant Battle Royal
How to become a Boglehead
Bogleheads follow simple investing philosophies to build their wealth and live better lives. Just follow these steps.
• Spend less than you earn and save the rest. You can do this by earning more, or being frugal. Better still, do both.
• Invest early, invest often. It takes time to grow your wealth on the stock market. The sooner you begin, the better.
• Choose the right level of risk. Don't gamble by investing in get-rich-quick schemes or high-risk plays. Don't play it too safe, either, by leaving long-term savings in cash.
• Diversify. Do not keep all your eggs in one basket. Spread your money between different companies, sectors, markets and asset classes such as bonds and property.
• Keep charges low. The biggest drag on investment performance is all the charges you pay to advisers and active fund managers.
• Keep it simple. Complexity is your enemy. You can build a balanced, diversified portfolio with just a handful of ETFs.
• Forget timing the market. Nobody knows where share prices will go next, so don't try to second-guess them.
• Stick with it. Do not sell up in a market crash. Use the opportunity to invest more at the lower price.
Sri Lanka squad
Dinesh Chandimal, Dimuth Karunaratne, Kaushal Silva, Kusal Mendis, Angelo Mathews, Lahiru Thirimanne, Niroshan Dickwella, Sadeera Samarawickrama, Rangana Herath, Suranga Lakmal, Nuwan Pradeep, Lakshan Sandakan, Vishwa Fernando, Lahiru Kumara, Jeffrey Vandersay, Milinda Siriwardana, Roshen Silva, Akila Dananjaya, Charith Asalanka, Shaminda Eranga and Dhammika Prasad.
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More on Palestine-Israeli relations
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FIXTURES
Fixtures for Round 15 (all times UAE)
Friday
Inter Milan v AS Roma (11.45pm)
Saturday
Atalanta v Verona (6pm)
Udinese v Napoli (9pm)
Lazio v Juventus (11.45pm)
Sunday
Lecce v Genoa (3.30pm)
Sassuolo v Cagliari (6pm)
SPAL v Brescia (6pm)
Torino v Fiorentina (6pm)
Sampdoria v Parma (9pm)
Bologna v AC Milan (11.45pm)
Match info
Athletic Bilbao 0
Real Madrid 1 (Ramos 73' pen)
RESULTS
1.45pm: Maiden Dh75,000 1,200m
Winner: Lady Parma, Richard Mullen (jockey), Satish Seemar (trainer).
2.15pm: Maiden Dh75,000 1,200m
Winner: Tabernas, Connor Beasley, Ahmed bin Harmash.
2.45pm: Handicap Dh95,000 1,200m
Winner: Night Castle, Connor Beasley, Satish Seemar.
3.15pm: Handicap Dh120,000 1,400m
Winner: Mystique Moon, Sam Hitchcott, Doug Watson.
3.45pm: Handicap Dh80,000 1,400m
Winner: Mutawakked, Szczepan Mazur, Musabah Al Muhairi.
4.15pm: Handicap Dh90,000 1,800m
Winner: Tafaakhor, Sandro Paiva, Ali Rashid Al Raihe.
4.45pm: Handicap Dh80,000 1,950m
Winner: Cranesbill, Fabrice Veron, Erwan Charpy.
Friday's schedule at the Etihad Airways Abu Dhabi Grand Prix
GP3 qualifying, 10:15am
Formula 2, practice 11:30am
Formula 1, first practice, 1pm
GP3 qualifying session, 3.10pm
Formula 1 second practice, 5pm
Formula 2 qualifying, 7pm
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