STRUCTURAL DEPTH

A proposed solution for the design constraints will be a two-way post-tension concrete band beam system with reinforced slabs. For this redesign, software such as RAM Concept will be utilized in the design of the post-tensioned floor systems. Other software will be used as needed for other structural elements. The system will consist of a series of parallel, wide, shallow beams with the floor slab spanning transversely between the bands. The floor slab will be designed as a continuous slab, with the shallow band beams carrying all loads from the slab. The longer spans in the structure are what require the beams to be post-tensioned. The band beam has a relatively wide, shallow cross section which reduces the overall depth of floor. The goal of using this system would be to change to an economical alternative design without compromising the layout of the floor plates, while also reducing the structural depth. Some concerns with this system would be the angle in the floor plan as well as the openings required in the floor. The openings in the slab will certainly require some extra attention in terms of constructability of the system.
The lateral system for the structure will ideally be redesigned using only reinforced concrete moment frames in every bay. If this design is not adequate for resisting the load conditions then reinforced concrete shear walls will be implemented. If needed, the current location of the braced frames will most likely be adequate locations for the shear walls. Also the elevator shafts could be included in the new lateral system by designing them with reinforced concrete. 

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CONSTRUCTION BREADTH

Post-tensioning of elevated slabs is a construction process that requires experience, coordination, knowledge, and preparation. Before beginning the elevated P/T portion of the work, the contractor, engineer, installation subcontractor, third-party inspection agency, and P/T material supplier should hold a pre-construction meeting to discuss the logistics and specific requirements of the project. Understanding the order of installation by reviewing the installation drawings can help when it comes to planning for deliveries and storage, installation, and stressing. This process will be investigated in order to gain more knowledge of the construction sequencing process and the required equipment.

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MECHANICAL BREADTH and MAE REQUIREMENT

Given the open floor plan of the structure with windows wrapping around the entire building at each level there will be an investigation into the current thermal properties of the façade. This will provide information about how the cooling and heating loads are affected by the large, open floor plan.  With windows wrapped around the entire perimeter at each level, the exterior walls provide a large thermal bridge to the space. Changing the façade materials can provide a better thermal envelope. This study will be prioritizing occupant comfort and energy use parameters over other additional considerations. In order to satisfy the MAE requirement, proposing a change in the façade of the building will require an additional components and cladding analysis for the new façade design.

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