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CFRP Grid/Rigid Foam Shear Transfer Mechanism for Precast, Prestressed Concrete Sandwich Wall Panels.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Bunn, William B. |
| Copyright Year | 2011 |
| Abstract | BUNN, WILLIAM GREG. CFRP Grid/Rigid Foam Shear Transfer Mechanism for Precast, Prestressed Concrete Sandwich Wall Panels. (Under the direction of Sami H. Rizkalla, Ph.D.) Prestressed precast concrete sandwich wall panels have been effectively used for decades to provide the building envelope for a wide variety of structures. Panels provide a host of functions, including providing the building envelope, architectural features, carrying gravity and wind loads, as well as insulating the entire structure. Typical concrete sandwich panels consist of two discrete layers of concrete, called wythes, one on either side of an inner layer of rigid foam insulation. The ability to transfer the shear forces between the two separated concrete wythes, across the insulating layer, is essential in attaining composite action and producing structurally efficient panels. Traditionally, a wide variety of steel connectors or solid concrete zones have been used to accomplish this transfer of shear forces. These methods, though shown to function well structurally, create thermal bridges across the insulating layer and severely hinder the insulating value of the entire building, consequently increasing the heating and cooling costs for the structure. This thesis summarizes the extensive experimental work undertaken to evaluate a new carbon fiber reinforced polymer (CFRP) grid/rigid foam insulation system as a shear transfer mechanism for precast load bearing sandwich panels and architectural cladding. CFRP grid has a significantly lower thermal conductivity in comparison to steel and concrete. Therefore, it is able to create the desired composite action and at the same time minimize the effect of thermal bridging. The experimental program investigated several parameters believed to affect the shear flow strength of the CFRP grid/rigid insulation mechanism. These parameters included the type and thickness of rigid foam insulation and the spacing between the rows of CFRP grid. A total of 66 panels were tested to evaluate the shear flow strength of these parameters. Test results were used to develop an equation to estimate the shear flow strength using the CFRP grid/rigid foam as affected by these parameters. CFRP Grid/Rigid Foam Shear Transfer Mechanism for Precast, Prestressed Concrete Sandwich Wall Panels by William Greg Bunn A thesis submitted to the Graduate Faculty of North Carolina State University in partial fulfillment of the requirements for the Degree of Master of Science Civil Engineering Raleigh, North Carolina 2011 APPROVED BY: ______________________________ Rudolf Seracino, Ph.D. ______________________________ James M. Nau, Ph.D. _______________________________ Sami H. Rizkalla, Ph.D. Committee Chair |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://repository.lib.ncsu.edu/bitstream/handle/1840.16/7286/etd.pdf?isAllowed=y&sequence=2 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
