Abstract:
This technical memorandum outlines a process for the planning, appraisal, and feasibility-level design of double-curvature arch dams, with a focus on updating the 1966 Engineering Monograph (EM) No. 36. The procedure begins with using established empirical formulas to determine initial dam dimensions and estimate concrete volume for planning purposes. For a more detailed appraisal-level design, the document describes using the Arch Dam Stress Analysis System (ADSAS) program for finite element analysis to optimize the dam's geometry by minimizing tensile stresses. To manage the large datasets generated by ADSAS, a custom Visual Basic program called ADSASREAD was developed to extract key results, which are then visualized using the software SURFER 11 to create numerical, contour, and vector plots of stresses, moments, and thrusts. The document also details the development of several example layouts for various canyon shapes, progressing from the initial empirical layout through the refined design process. A key future goal outlined is to finalize the pre-processor program TRUEGRIDARCH, which will create a finite element model in LS-DYNA for advanced static and seismic structural analysis, bridging the gap between traditional design methods and modern FEA capabilities.
