Behavior of Innovative Precast Shallow Floor Framing System

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Title: Behavior of Innovative Precast Shallow Floor Framing System
Author: Amortnont, Adam Michael
Advisors: Dr. Rudolf Seracino, Committee Member
Dr. Emmett A Sumner III, Committee Chair
Dr. James M. Nau, Committee Member
Abstract: Modifications to conventional composite floor systems have been made to increase span lengths and decrease structural depths. The competitive market has also led to the development of systems to improve the ease and speed of construction. Diversakore® is developing an innovative composite shallow floor framing system comprised of precast prestressed steel-concrete composite girders, precast hollow core planks, and a cast-in-place concrete topping slab. The precast girders are constructed with a cambered u-shaped steel plate along the bottom of the section which serves as a stay-in-place form. A composite section is created using normal weight concrete, draped prestressing stands, conventional mild reinforcing steel, and the u-shaped steel plate. The sides of the girder above the u-shaped steel plate are formed to create the inverted t-beam section and provide an end bearing surface for the hollow core planks. The cambered precast girders support the hollow core planks during erection and the cast-in-place topping slab is utilized to engage the planks and form a composite t-beam. The camber in the girder eliminates the need for shoring during erection and enhances the constructability of the system. A research program sponsored by the NSF IUCRC on Repair of Buildings and Bridges with Composites (RB2C) is currently ongoing at the Constructed Facilities Laboratory at North Carolina State University to evaluate the ultimate strength and serviceability performance of this innovative floor system. The experimental and analytical program includes full-scale tests of representative sub-assemblages and utilizes a layered sectional analysis to predict the behavior. The results of the analytical model and the experimental investigation are presented along with conclusions drawn from the initial phase of the research program.
Date: 2010-04-30
Degree: MS
Discipline: Civil Engineering

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