Building Statistics - Structural

Wellington Condominiums

Building Statistics

GENERAL ARCHITECTURE ENVELOPE STRUCTURAL MECHANICAL FIRE PROTECTION ELECTRICAL MASONARY CURTAIN WALL

Structural:

Cast in Place Concrete The foundation and first floor consists of a large part of the cast in place concrete that was done on the construction site. To get a better picture of what type of horizontal and vertical formworks and the concrete placement methods that were approached on the job site; a breakdown of the foundation and first floor elements will be described as followed:
Footings:
	Normal weight concrete with a minimum compressive strength of 6000 PSI at 28 days Reinforcing will consist of A615, Grade 60 Average size of column footing 15’L X 15’W X 18”D Minimum of 3 feet below finished surface where exposed to frost Minimum allowable bearing pressure of 3500 PSF
Slab on Grade:
	5 inches of normal weight concrete with a minimum compressive strength of 3000 PSI at 28 days Reinforced with 6 X 6 – W2.1 X W2.1 welded wire fabric, over a 14 inch crushed stone sub base and vapor barrier
Foundation:
	8” and 12” normal weight reinforced concrete with a minimum compressive strength of 6000 PSI at 28 days
First Floor:
	12” of normal weight reinforced concrete with a minimum compressive strength of 6000 PSI at 28 day


With the knowledge of that in hand the horizontal and vertical formwork are very standard in today’s construction industry. The foundation strip and column footings on the job site did not require any horizontal or vertical formwork due to the fact that the soil at the time had enough cohesion to stay in place. The only task left was to place the footing rebar and place the concrete with a concrete pump truck at the locations required. Once the footings were to the strength required the foundations, exterior walls, and columns took form with large vertical formwork. These large forms took shape very quickly with a 120 ton AmQuip crane tipping up each one into position. The formwork was then connected and reinforced into place with lateral bracing. Once the rebar was properly situated the foundation walls and columns were poured with the concrete pump truck. After pouring the slab on grade with the concrete pumps the next focus was on the first floor. The first floor would be the first encounter and need for horizontal formwork. The formwork consisted of setting up metal shores, stringers, and joists with plywood as the sheathing. The first floor’s vertical formwork would also make use of plywood as the ease of handling and construction. The rebar and roughins were situated and the concrete was placed using the concrete pump trucks.
Structural Steel
Figure 2: Composite Deck Composition - Reference: www.swirnow.com
The Wellington Condominium project did not make use of large structural steel components but is using a very innovative system called the Hambro’s joist 3” slab on deck composite system. The second, third, and penthouse floor make use of this system. This floor’s bearing and shear wall components were designed into the Wellington Condominium project by the stud engineer and made use of 4” and 6” metal stud walls at 16” o.c. These walls are capable of carrying the loads directly and therefore make it very easy to lay up this composite system. The general steps with advantages to this system are laid out as prescribed by the manufacturers Swirnow Structures.
Spreading Joists: Spread Hambro joist at 4’-1 ¼” on load bearing walls Placing Roll bars: Roll bars are to keep uniform spacing while providing lateral and tensional stability Installing Plywood Forms: Installing the plywood forms a working surface and forms a rigid diaphragm during construction Mesh In Place: Mesh over top chord of joist creates a way of reinforcing concrete Pouring Concrete: No shoring is required with this system when pouring concrete. The minimum thickness requirement is 2 ½”. The Wellington Condominium project makes use of 3” slab thickness. Stripping Formwork: When concrete reaches strength of 500 PSI (usually the day after the pour) the plywood forms can be taken out. When the concrete reaches strength of 1000 PSI (usually within 48 hours) the deck is ready for other trades and the formwork can be removed for future re-use.
A mobile crane is utilized on the project to place the joist system and has a reach of 180’ therefore limiting our need to moving the crane around the structure to one side. The crane is typically situated on the west side of the structure and will drive up and down this side of the building as required. The crane after placement of all floors/ceilings will then continue to be of service when the metal roof trusses are installed. With road access to 3 sides of the building structure there is no great danger of conflicts when the concrete trucks and cranes are working simultaneously.

This is a student-generated Capstone Project e-Portfolio (CPEP) produced in conjunction with the AE Senior Thesis e-Studio.

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