Structural floor systems represent a major portion of both the cost and weight of precast concrete building frames. Hollow cores (HC) are considered one of the most common precast floor systems due to their advantages in terms of economy, lightweight, structural capacity, and ease of production and erection. This paper presents the development of a new precast/prestressed floor system that is alternative to HC planks. The proposed floor system consists of sandwich panels that have comparative weight and structural capacity to HC planks while being efficient in thermal and sound insulation. These panels can be easily produced as they do not require specialized equipment for fabrication, which eliminates the need for high initial investment. The proposed floor panels consist of an internal wythe of insulation and two external wythes of concrete similar to precast concrete sandwich wall panels. The two concrete withes are designed to be fully composite through the use of shear connectors. Two types of shear connectors are presented 1) glass fiber-reinforced polymer GFRP ties for roof applications; and 2) steel ties for floor applications.
This paper presents the design and detailing of two 26 ft long and 4 ft wide specimens that were produced and tested at the Structural Laboratory of the University of Nebraska - Lincoln. One panel was produced using GFRP ties and without any intermediate concrete connectors (fully insulated), while the other panel was produced using steel ties and intermediate concrete connectors. The two specimens were tested in flexure under point load at the mid span. The load-deflection relationships have indicated that the two panels have full composite action and comparative structural performance to the HC planks.
تاريخ النشر
10/01/2011
الناشر
Proceeding of the PCI Convention and National Bridge Conference
ايليا عزت عشم حنين | Eliya Ezzat Asham Henin, Ph.D., P.E., S.E., PMP. | 5675