The Capital is a 19-storey office building located in Bandra Kurla Complex in Mumbai with a unique elliptical ring beam feature. It has 2 basement levels for automated parking for over 900 cars. The building uses a reinforced concrete core wall system with composite steel columns, and post-tensioned concrete slabs to provide large column-free floor plates. Up-down construction and a shoring pile system allowed for fast construction. The building offers high-quality amenities, flexible office spaces, and has become a landmark in Mumbai's business district.

1. The Capital at BKC
Ltd.
M/s. Mahimtura Consultants Pvt.
 Project Title:
‘THE CAPITAL’ at BKC, Mumbai
 Project Details:•
General
‘The Capital’ is located in ‘G’ block of Bandra Kurla Complex, the
international Finance & Business Centre of Mumbai.
This office building has 19 - storey (about 78.625 m height), superstructure
and 2 basement levels (about 16 m depth) for an Automatic car parking.
Proposed area of development is approx 14, 13,000 Sft.
All the basements are housing a multi level automated car parks and utility
services to accommodate @ 900 Plus cars. R.C.C. Elliptical ring on the rear
face is a unique feature imparting an Iconic look to the building.
The structural system is proposed to be the Reinforced concrete core wall
at centre with the structural steel composite columns to form a duel
system, an ‘Iconic’ building element in the building in Mumbai.
•
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Photograph:-

2. The Capital at BKC
Ltd.
M/s. Mahimtura Consultants Pvt.
Photograph 1 - View of ‘The Capital’ at BKC, Bandra.
 Project Status
Project Complete
 Year of Inception
Construction of ‘The Capital’ started in year 2009 & was completed in
year 2012.
 Estimated Cost of Project
The Approximated Estimated Cost of Project was @ 500 Crores.
 What makes the Project Eligible for an Engineering Excellence
award 2013
i) The conceptualization while planning “The capital” was done to create an
Iconic landmark in Mumbai with not only a unique aesthetical look but also
the facility, services and flexibility of space utilization in the premises being
offered to the end user.
ii) Following structural arrangements are configured in “The capital” to enhance
iconic status of the building, and provide that adequate flexibility & head room.
iii) Structural system comprise of central RC core walls to resist lateral and gravity
loads. Composite columns are designed to resist gravity load. The post tensioned
RC flat slabs provides a clean slab soffit and minimum number of 8 columns
facilitate clear / wider floor giving flexible interiors place.
Ring Beam on the rear side: This unique and challenging feature of the structure gives the structure an iconic
status. Refer Photograph 2, shows the pictorial view of the ring beam & speaks of
the uniqueness and efficiency of the structural system.
The details of the R.C.C. ring beam are as follows ……..
•
•
Diameter along major axis
:
71.00 meter diameter Inclined to
horizontal at 20 degrees.
•
Diameter along minor axis
:
46.00 meter diameter Inclined to vertical
at 20 degrees.
•
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Shape
:
Elliptical in vertical plane.
Elliptical profile ring beam
:
Peripheral lowest point of elliptical profile
ring beam starting between the 3rd & 4th

3. The Capital at BKC
Ltd.
M/s. Mahimtura Consultants Pvt.
floor and highest point of ring beam in
between 13th & 14th floor.
Photograph 2 - Elliptical shaped Ring Beam seen in the Elevation

5 Points which makes this Project Innovative (Breakthrough / applied)
i) Up Down Construction:
The up down construction methodology means you can work in the substructure and
the superstructure at the same time. Adopting this system of construction resulted in
fast progress. Refer Photograph 4 below, shows erection of full height structural steel
columns in the basement.
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4. The Capital at BKC
Ltd.
M/s. Mahimtura Consultants Pvt.
Photograph 3 - Erection of Steel columns in the Basement.
After carrying out mass excavation structural built-up column spanning triple floor
height with cross bracing, ultimately embedded in R.C. C. slabs were erected till the
ground floor. A self supporting decking system was then provided at ground level and
then construction activity in the substructure as well as for the superstructure was
taken up simultaneously.
ii)
Two independent structures, a dia-grid structure within ring beam:
A three dimensional oval structural steel skeleton hollow circular pipes 320 mm dia
intermediate and 850 x 850 square outer peripheral ring using 60 mm thick steel
plates forms the dia-grid within the ring spanning 78 m. Refer Photograph 4 which
shows pictorial view of the dia-grid.
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5. The Capital at BKC
Ltd.
M/s. Mahimtura Consultants Pvt.
Photograph 4 - The elliptical Dia-grid beam profile (under construction)
All the intermediate slabs are supported over the edge ring beam. These ring
beams, cast in segment are fully supported by staging till the time the ring beam is
complete and the concrete matures. It’s a engineering feat and an unique type of
structures proving our capability to design such a structure, undertake heavy
structural steel fabrication and also considering the constructability aspect of it.
iii) Foolproof shoring system: A foolproof sacrificial shoring pile system in form of 750 mm dia cast in situ RCC
bored piles of 21 m length and spaced 100 mm apart, connected by a capping
beam & 75 T & 60 T anchors at specified levels were put in place to avoid any soil
collapse. These piles are anchored using pre stressed inclined rock anchors at two
levels and of 75 T and 60 T respectively. Provision of the shoring system added to
the building cost but at the same time it was a totally hassle free and continuous
work when the construction started.
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6. The Capital at BKC
Ltd.
M/s. Mahimtura Consultants Pvt.
iv) Flat floor plates:
The floor plates were designed using Post Tensioned (PT) concrete construction
even for the max span of 11.0 m. The structural system with PT facilitated
elimination of internal columns thus providing visually clean office premise. Flat
floor plates without any drop or beam (only flat edge beam) projection are
provided for the user to make use of full floor to floor height.
This provides 100 % flexibility to the interior architect while planning the office
layouts. A floor to floor height above ground floor is 3.9 m with PT slab could be
achieved in major portion of floors. Use of Post tensioned concrete slabs above 4 th
floor with high grade concrete made it possible to span large column free spans.
Refer Photograph 4 which views the flat slab with a clean soffit.
Photograph 5 - Flat slab with clean soffit
v) The structural system
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7. The Capital at BKC
Ltd.
M/s. Mahimtura Consultants Pvt.
The structural system comprise of central RC core walls to resist lateral and
gravity
loads. Composite columns are designed to resist gravity load. The post tensioned
RC flat slabs provides a clean slab soffit and minimum number of columns
facilitated clear / wider floor giving flexible interiors place.
vii) Minimum obstruction of columns due to larger grid & Possibility of creating
smaller
office units:
Large ‘column free’ spaces are provided by restricting column spacing to 9.8 m as
well as the column sizing. Composite column with high grade structural steel S-355
plates and concrete reduced column sizes significantly resulting in less column
obstruction providing more carpet area to the end user.
 5 Points on the Operational Excellence of the Project.
i) Structural Uniqueness –
It is one of the few projects, in India with Cyber texture type of architecture
done by an International architect. The structural challenge was meticulous
sizing of the ring beam & supporting columns in such a way that it does not
obstruct the view and symmetry of the structural arrangement, of the office
space to be utilized. Combination of choice of structural system along with PT
facilitated elimination of internal columns thus providing visually clean office
premise.
ii) An efficient vertical transport system with 16 numbers of high speed elevators
in operation on the project. Besides, the project has got a provision for a
Helipad also.
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8. The Capital at BKC
Ltd.
M/s. Mahimtura Consultants Pvt.
iii) An intelligent Traffic analysis is in use at the Capital using 16 high speed
elevators, reducing the waiting time for every user of the premise.
iv) Self sufficiency in terms of availability of adequate numbers of car parks.
All the basement levels area designed as a car park to accommodate 900 plus
numbers of cars. Thus, making the project a self reliable one as far parking of
cars is concern. Refer Photograph 6 which views installation of multilevel
automated car parking system in the basement was constructed
simultaneously
with the superstructure, thereby saving enormous time & cost.
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9. The Capital at BKC
Ltd.
M/s. Mahimtura Consultants Pvt.
Photograph 6
Car Park level is the Basements
v) A conventional beam – slab system, there would have been beam / drop panel
projection seen in different zones which would have further result in reduced clear
floor height below the beams, thereby reducing the intrinsic value of the office
space.
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10. The Capital at BKC
Ltd.
M/s. Mahimtura Consultants Pvt.
 5 Points on as how this Project has added to the Self Reliance of India in
the Chosen Sector.
i) The use of structural steel in buildings similar to The Capital has started a new
trend in India from the Green building concept point of view and would help in
Economic growth of India.
ii) The reduced carpet to Built up ratio due to lesser no of columns / walls is
attracting lot many (Multi National companies) MNC’s from investment point of
view to set up office and start business in India.
iii) BKC being the most preferred place from accessibility point of view due to its
central location and close vicinity to the International / domestic airports. An
office Investment in BKC (Bandra Kurla Complex) is worthy enough for any
business man or an entrepreneur.
iv) The Capital has created an impact on the area in general bringing the nodal
development in Bandra Kurla Complex into international limelight as a hub for
many business head quarters thereby attracting more investment in the ‘Dollar’
terms in India.
v) Discharge of the black water into the sewage treatment plant and using such
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11. The Capital at BKC
Ltd.
M/s. Mahimtura Consultants Pvt.
recycled and clear water has reduced today’s water requirement to almost half.
Thus, reducing the load on the Civic infrastructure for increased water
requirement.
 5 Key Impacts the Project has made
i) Main objective of international Finance and Business Centre (IFBC) planning is
to
create new office locations of international standards, ensuring easy
accessibility
and high quality of amenities for employees, safe environment and a distinct
character and image.
ii) The building elevation with an ellipse has offered an elegant look to BKC area &
It’s a unique type of a structure in Mumbai.
iii) The structure is mainly using the composite steel sections. Such structures in
steel shall propagate an idea of steel buildings encouraging the Green Building
concept.
v) Since the office premise is clear of column and the slabs are flat slabs, the
Client has a got flexibility of dividing the office space to create smaller size
offices, if desired so, in view of the current market scenario. This is one of the
USP’s of the design concept. With conventions slab beam construction system
clear height in the office would have reduced hampering the aesthetic and low
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12. The Capital at BKC
Ltd.
M/s. Mahimtura Consultants Pvt.
ceiling height.
 5 Points Illumines more on the Future Readiness of the Project.
i) The Capital has created an impact on the area in general bringing the nodal
development in Bandra Kurla Complex into international limelight as a hub for
many business head quarters thereby attracting more investment in the ‘Dollar’
terms in India.
ii) In regards to use of steel in building the trend set up in the capital, a
commercial
building is now shifting toward the residential zones also wherein the
developers
are seriously thinking of having residential buildings in structural steel in view of
the advantage the steel structure can offer.
iii) Today the bench marks for High quality Standard is set with construction of
‘The
capital’. An efficient building sustainable design concept is implemented on
this project keeping in view the Green Building concept by using blended
Cement, Structural steel and a new trend of Self Compacting Concrete (SCC) in
Indian construction Industry.
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13. The Capital at BKC
Ltd.
M/s. Mahimtura Consultants Pvt.
iv) The extensive and thoughtful use of Glass on the faced, enveloping the entire
building gives a pleasing aesthetic to the building. This is a boost to the Indian
glass industry from India’s self reliance in the Glass sector and from an
economic growth point of view.
v) The Capital is probably first of its kind in Mumbai with limited space but with
an efficient car park arrangement thereby reducing the land requirement in
urban cities like Mumbai.
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