Safety and Stability in Concrete Barrel Shell Roof Structures.

摘要

The debate between Anton Tedesko and Charles S. Whitney which occurred from the 1930's through the 1950's typifies the confusion among designers in the United States regarding thin shell concrete roof design. Each man thought his method was correct and designed structures constructed in America during the first half of the twentieth century. By taking a closer look at their debate, we can gain some insight into their methods of design. To resolve the conflict, we then apply modern methods of analysis to analyze a hangar model Whitney had presented in his articles. A full span analysis is performed using the finite element computer program P-FRAME. In addition, we address concerns which were not incorporated into the original analysis. We employ the methods of Milo S. Ketchum and Robert S. Rowe to compute deflection moments for the structure. In addition, we use Ketchum and Rowe's work as background for developing the Initial Deflection Method of computing buckling safety factors. To validate the procedure, we compute buckling safety factors for a variety of structures and compare them to classical formulations.