Using post-tensioned slabs in hotels is very common due to the need for open concept lobbies and community spaces on the lower floors. Post-tensioned concrete slabs provide increased strength in design, and larger column to column spans. While it is apparent why the post- tension system was chosen there are various aspects of the design that could be redefined. Currently there are 19 different column sizes and configurations utilized in the building, most of the columns, with the exception of some interior bays, are offset from the typical grid and follow little to no pattern or uniformity. While there may have been an initial architectural or functional reason for this it is currently unapparent and seemingly unnecessary. The multitude of column configurations adds an increased level of difficulty to the structural engineer, the general contractor, and the concrete construction crew. In addition, the post- tension slab designs differ greatly from floor to floor even though the same floor loads are present throughout the building. Furthermore, the post-tensioned slabs result in a more difficult construction process and greatly extend the duration of construction. Due to these factors the following re-design is being proposed.

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The columns are to be re-positioned and re-designed to make the building more uniform. A new grid system will be proposed, or the existing grid will be updated, to facilitate the new design while still ensuring that no columns interfere with the current architectural layout or features. In the re-design of The Hyatt at Pineapple Grove shear walls will remain in the same location but will be changed from cast-in-place to pre-cast. The re-design will result in an ease of construction and will potentially reduce the construction schedule and cost. In addition, all aspects of the building, primarily the shear walls, will need to be re-designed and improved as two additional floors are being added to meet the height requirements. Additionally, pre-stressed hollowcore slabs are being proposed as an alternative gravity system. In addition to providing easier construction, hollowcore slabs also save on materials reducing its impact on the environment as well as material costs. Because sustainability is such an important aspect in the original design hollowcore slabs will be very beneficial. Furthermore, the use of hollowcore will allow a greater integration of the structural system and mechanical system. Not only will this re-design improve discordance in the original structural design it will facilitate cooperation between other branches of engineering .

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