Special topic in structural Engineering

Capital Gate Abu Dhabi

Bara AlRefai United Arab Emirates University

Capital Gate ❖ 160 m tall ❖ 35 stories ❖ Inclined 18 degree to west.❖ Capital gate title four

times more than the Tower of Pisa.

❖ It got Guinness certificate for furthest leaning man mad tower.

Capital Gate

❖  

Capital Gate ❖ Cost $233 million.❖ 600 people labor force

participate in construction.❖ Two year of constriction.❖ Completed in 2011.❖ Total Area :53,100 square

meter.❖ Mainly used for hotel and

offices.

Structural system❖ Concrete core surrounded

by two steel truss (diagrid system).

❖ External and internal diagrid system (lateral load resisting system).

❖ Steel beam support concrete floor & run between two diagrid system.

Structural system❖ Outriggers are horizontal trusses

connect building core distant structural element.

❖ Used to increase strength and overturning stiffness.

❖ The dense outriggers system started to be used from17th mechanical floor.

❖ Mainly used to resist wind load.

Foundation

❖ Rectangular raft footing.❖ 2 m depth and 7000 cubic

meter reinforced concrete.❖ 490 piles.❖ Each has 1 m diameter.❖ Half under compression

with depth of 20 m.❖ Other half under testation

with depth of 30 m.

Loads calculations

❖ Source:❖ https://

sites.google.com/site/group5capitalgate/structure/i-analysis-and-description

Irregularity that Should be taken in consideration ❖ The flowing Vertical

Irregularities that may exist in Capital Gate Abu Dhabi :

1. Stiffness irregularity.2. Mass irregularity.❖ The flowing plan

Irregularities that may exist in Capital Gate Abu Dhabi :

1. Torsional irregularity.2. Diaphragm Discontinuity.3. Out-of-plane Offsets of

vertical Element.

Thank You

References ❖ www.rmjm.com/the-architects-perspective-the-c

apital-gate❖ www.e-architect.co.uk/dubai/capital-gate-abu-dh

abi❖ www.economist.com/blogs/dailychart/2011/10/le

aning-buildings❖ www.slideshare.net/nayanrao1/seminar-on-capit

al-gate-building❖ https://sites.google.com/site/group5capitalgate/s

tructure/iii-drawings-and-diagrams❖ https://

store.ctbuh.org/PDF_Previews/Books/2012_CTBUHOutriggerGuide_Preview.pdf