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This paper describes the comprehensive test and analysis program initiated for the development of titanium intermediate diagonal tension-field shear beam analysis and design methods necessary to support the Boeing SST. Existing semiempirical design and analysis procedures for aluminum beams have been extended for use with titanium beams. Detailed studies of the test results and current design methods show that major improvements of intermediate shear beam structural efficiency can be obtained through improved analytical procedures. A general theoretical analysis of post buckled stiffened plates, adaptable to the analysis of intermediate diagonal tension-field shear beams, was developed and is presented here.The theoretical formulation of this nonlinear problem was solved by the Raleigh-Ritz method. Improvements available after the theoretical program becomes fully operational should constitute a second generation of shear beam designs that will provide improved and more efficient structure for the SST and other new vehicles. Areas for improvements to shear beams that have evolved during the program are indicated.

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