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Thesis Proposal

Structural Depth

Post-tensioning will be studied as a means of reducing the slab thickness of portions of 100 Eleventh Avenue's floor sytem. The two areas to be considered are as follows:

-Slab perimeter, where the floor thickens from 9" to 18.5" due to increased spans and imposed loads fromt the building facade
-19th level transfer slab; a heavily-reinforced, 18.5" floor system

The study will compare the results of the post-tensioned design to that of the existing, using criteria such as cost/material, weight, appearance, and practicality.

M.A.E. Resources: RAM Concept, a structural analysis and design program that utilizes the finite element method for elevated concrete floor systems, will be utilized in the post-tensioned design process. Concepts learned in AE 597A: Computer Modeling will be drawn upon to learn and use this analysis program. These concepts include the stiffness method, behavior of truss, beam, frame, and grid elements, and interpretation of computer analysis results.

Breadth I: Construction Impact

The impact the post-tensioned redesign will have on the construction process will be studied. Items such as schedule, cost, sequencing, and NYC's familiarity with post-tensioning will be addressed.

Breadth II: Shading

Because nearly half of the building's perimeter is clad in glass, managing the amount of natural light entering its spaces is an important issue. Effort will be taken to find an efficient, more attractive option than the current system of remote-controlled Lutron roller shades. Attention will also be payed to the amount and quality of penetrating light.