Standardized Design of Double Tees With Large Web Openings

This paper is the second of two papers dealing with research conducted at the Universify of Nebraska on the design of double tees with large web openings. The earlier paper dealt with experimental and theoretical studies as well as initial design recommendations. This phase of the project aims to further maximize and standardize opening sizes and locations. It also aims to simplify the additional design steps required to account for the presence of web openings. The results of the study show that a significant number of large openings can be incorporated into the webs of double tees without reducing the structural capacity of the member if two main conditions are met: (1) No openings are placed within a distance equal to the strand development length from the member end, and (2) additional vertical stirrups, as detailed in this paper, are provided at the edges of the openings.