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Capital Gate Tower by RMJM: A structural marvel

Capital Gate Tower by RMJM: A structural marvel

Abu Dhabi, the powerful capital of the UAE is all around recognized for its stunning skyline of high rises. One of its heightened structures is the Capital Gate tower by RMJM, which gets one’s eyes because of its natural structure. The curvy capital gate is an eye-getting and notable structure, making an extraordinary character through its gravity-resisting inclination of 18 degrees.

View of Capital Gate Tower, Abu Dhabi ©

With its construction finished in 2011, the structure had the option to obtain a lot of response. The 18 degree toward the west inclining tower has a Guinness world record for the “world’s furthest leaning manmade tower”. The Tower is one of its sorts because of an excellent underlying framework. This utilizes a pre-cambered center and vertical post-tensioning of the center.

Derivation of the Design Concept:

Abu Dhabi National Exhibitions Company (ADNEC) approved RMJM architects to design a cutting edge presentation community for the advancement of Abu Dhabi’s occasion area. The thought was to make a mark tower with advanced plan style with top-notch offices for live occasions. The underlying and specialized perspectives ought to be to such an extent that it respects human accomplishment and reverberates with Abu Dhabi’s dynamism.

The organic form of the Capital Gate tower ©

The plan thought is magnificently reflected in the tower’s structure. The two principal common components of Abu Dhabi – ocean and desert structure the establishment for the structure’s striking structure. The Tower structure connotes a twirling twisting of sand. The parametric overhang, differently known as a sprinkle, running over the show off makes a wave-like impact inferable from the Tower’s vicinity to the ocean. The mixture of the conventional and present-day style is reflected by coordinating the Tower with Abu Dhabi’s notable construction the National Day Grandstand.


Because of the total awry state of the structure, each floor plate has a novel shape and size. The type of the floor plans changes from ‘bent three-sided’ to ‘bent rectangular’ as the tallness of the structure increments. To give the curve and lean structure, the floor plates are amazed giving an alternate look to the structure from all bearings. All the rooms have various shapes and territories.

Floor plans showing the dynamism of the tower ©
Floor plans showing the dynamism of the tower ©

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Height of Capital Gate Tower by RMJM: A structural marvel

The 160m tall Tower comprises 35 stories and offers more than 15,000 sqm. It utilize business purposes including workplaces, retail spaces, and the Hyatt lodging. Moreover, the structure contains 30 gathering rooms, a meeting territory, a business place, food courts, and a helipad on the housetop. A pool put 80m over the ground is based on the seventeenth and eighteenth floor. A huge chamber welcomes common light inside the construction and furthermore contains a tea relax. The outside lighting utilizes brilliant innovation to limit energy utilization and change as indicated by the accessibility of characteristic light.

Funnel-shaped atrium at the Hyatt hotel entrance ©

There were a few difficulties during the development time frame as new highlights were presented at a later stage. A two-celebrated advancement including a pool and café was presented 90 meters over the ground. The weight was assessed to be 150 tons and the cantilevered structure was then upheld by 22 supported steel swaggers. Further, just a half year before the development commencement, a helipad was presented as a plan component. The erratic breeze loads were a potential danger that could evacuate the helipad upwards. Be that as it may, the issue was in the long run settled by decreasing the stature of the helideck to 2 meters over the rooftop.

Helipad at rooftop ©

Making history with its ‘never been used before” technologies:

The Structure

The turned and inclining type of the design was made conceivable with the assistance of a post-tensioned solid center encompassed by a steel-bracket diagrid framework. The steel radiates run all through the structure length holding the diagrid framework at extraordinary finishes together while supporting the solid floor and metal deck. The structure center and outer supporting are associated through flat brackets called outriggers.

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Meanwhile, to make up for the breeze, seismic and gravitational powers brought about by the inclining building highlight, the Tower is based on fortified cement rectangular pontoon balance on 490 solid heaps. A big part of the heaps which run 20 meters deep are under pressure while the other half running 30 meters deep are under strain because of the structure’s shade.


Moreover, the structure center was pre-cambered (shifted) away from the shade and thusly fixed by the dead heap of the Tower. Hop framing strategy was utilized for the development of the center. Cementing was executed around evening time as day warmth could dry out or break the solid. The center was post-tensioned with the assistance of 146 ligaments, each 20m long, traversing through 5 stories.

Pre-cambered core construction ©
Pre-cambered core counteracts the dead load on the other side of the building to straighten the core ©

Floor plate:

Composite deck is utilized to interface the fundamental center to the diagrids. The pre-projected insertion plates in the center are joined to the floor radiates for supporting the floor plate. While being stacked on over the request till the tenth floor, the floor plates lurch by 800-1400mm on the floors above it till the 27th floor. The excess floor plates have a tendency from 300-900mm.

Diagrid system:

External diagrid system ©

600mm x 600mm empty steel segments make the outer diagrid framework. Every part has an alternate length, curve, thickness, and point. The thickness of steel areas goes from 80mm on the lower floor to 40 mm on the highest levels. A solid supporting framework is kept up by interfacing all the diagrid hubs with rafters. The inward diagrid comprises empty steel segments that are 80mm in thickness. The inward diagrid underpins the heaviness of the 18 stories which comprises a chamber. However, the channel formed interior diagrid is associated with the structure’s center through primary individuals on the mechanical floor.

External diagrid system ©

Wind bracing:

The Capital Gate tower opposes the breezes by a mix of center dividers and outriggers inbuilt on the mechanical floor. The streamlined structure gives protection from the twist. Further, the push because of the diagrid is moved to the establishment. With the assistance of a solid ring pillar on the ground floor.

Wind bracing ©


The sprinkle molded metal lattice fills in as the sun concealing for the Tower. At each five stories, the lattice is propped to the structure with cross-supporting bars at a diagrid hub.

The metal mesh “ Splash” shading the tower ©

It is suspended from the eighteenth and nineteenth floor where the patio is cantilevered by 12 meters. The cantilever is associated with the outer diagrid. With the assistance of steel areas put corner to corner on the mechanical floor. Essentially, on the eighteenth floor (mechanical floor), all the underlying components of the Tower are propped together.
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Making of the iconic façade:

Because of the natural state of the structure, all the 12,500 glass sheets and 8,250 steel areas are of various measurements. Moreover, each of the 800 diagrid hubs has various designs. One of the difficulties was to produce, introduce a lopsided precious stone shape façade. Which ought to be weatherproof and energy-effective also.

Curtain wall being installed on the external diagrid ©

A window ornament divider and coating framework represent the cladding arrangement of the Capital Gate tower. The window ornament divider is comprised of jewel-formed boards that are two-stories high. Propping the boards at the center floor chunk guarantees obstruction against the wind. Hence, the glass utilized in the drape divider has low-emissivity, great warm protection, and glare decrease properties.

Sustainable strategies used in the making of Capital Gate Tower:

ADNEC, RMJM modelers, and architects were focused on coordinating aloof and dynamic plan answers to accomplish manageable structure accreditations.

Economical structure

Twofold skin façade, energy-effective coating, sun-concealing lattice, low-stream water installations, diminished development material, green rooftop, keen HVAC, and energy control frameworks are a portion of the components that contributed essentially to making an economical structure while upgrading the structure’s exhibition.


The sprinkle concealed sun concealing metal lattice wraps the structure from the south to evade the direct daylight. The cross section withdraws 30% of warmth acquire, thus decreasing the heap on cooling.

Diagrid framework

The inner and outer diagrid framework shapes a twofold skin façade at the upper inn floors which lessens the sunlight-based warmth acquire. The air from the visitor rooms is shipped off the façade cavity where a protecting cushion is made between the cool indoor air and hot outside wind. This reused cool air is then recycled in the rooms. The straightforward façade glass has low-emissivity which keeps the indoor cool while maintaining a strategic distance from glare.

Section of Capital Gate tower through the core ©

Material Savings

The natural and bent structure saves a lot of development material including steel, glass, and cement, hence diminishing the carbon impression of the Tower. The vegetated rooftop utilizes local plants that utilization less water system and at the same time increment warm protection. Rather than introducing a chiller plant on the site, area cooling is utilized as an energy-proficient method for cooling. Shrewd structure frameworks for lighting, HVAC, and force utilization additionally diminishes the general energy utilization by the structure.

Capital Gate Tower by RMJM: A structural marvel

Capital Gate tower is the first of its sort of building that has set new benchmarks because of its underlying developments. Other than having a world record of the uttermost inclining artificial Tower, it is the primary structure to utilize a pre-cambered center that fixes up as the upper floors are added. It is additionally the principal design to utilize the idea of vertical post-tensioning of the center and double diagrid framework (outer and inner). Hence, the Tower is a magnificent illustration of an underlying wonder that utilizes current advances to make a character and a set model for the cutting edge structures to come.


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