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Design with sadsf method and analyses of elastic properties of torsion-loaded structures based on double-tee sections

The paper presents results of the preliminary strength design using the method of statically 
admissible discontinuous stress fields (SADSF) of two new and interesting thin-walled 
structures based on double-tee sections. Although these constructions are intended to carry 
torsion moment loads, all their surfaces are accessible from outside. The paper is completed 
with the selected results of linearly-elastic FEM analyses of the presented solutions. They 
show surprisingly good strength properties and significantly higher load-carrying capacity 
comparing to structures designed in an intuitive way. The objectives of the paper, among 
other things, are as follows: popularization of the SADSF method, presentation of its new 
solutions and confirmation of practical usefulness in the design of thin-walled structures.