Abstract
This paper describes three static load tests that were conducted on full-scale pretopped 12DT30 double tees. All specimens were typical production double tees spanning 62 ft (18.9 m) and representing typical units used in parking structures. Design of the units used heavy live loads and the ACI 318-02 Building Code for load and resistance factors. The bottom tensile stress under full live load was in the range of 10.3 √∫' c to 11.9√∫' c , which places these units in the Class T category of ACI 318-02, Section 18.3.3. Although the specimens' stem dimensions varied, the double tees shared many common features, including total omission of shear reinforcement in the web. The paper concludes with appropriate recommendations related to the omission of web reinforcement in prestressed concrete double tees of similar geometry.
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