Design by Analysis of Innovative Navigation Structures. User Manual

Abstract

Abstract : This report is the user manual for the 'Design by Analysis System-Innovative Navigation Structures' (DBAS-INS). The Windows-based computer program creates a solid, three-dimensional (3D) finite element model of innovative structures fabricated using 'in-the-wet' construction methods, such as the Braddock Dam currently under construction in the U.S. Army Corps of Engineers' Pittsburgh District. These structures are initially fabricated as a floating shell in a dry dock. The floating shell is divided into a 2D grid of hollow cells separated by reinforced concrete walls. Most significant structural loads involve hydrostatic pressures on the walls as the segment is floated to the installation site, lowered to the foundation, and filled with tremie concrete. The individual concrete slabs that form the walls of the cells must be designed for shear, moment, and thrust loads caused by the expected load combinations on the structure. DBAS-INS procedures were developed to assist in the design and analysis of innovative navigation structures by simplifying the steps required to describe a new design, create a finite element model, check all load cases, design the reinforced concrete structure, and study modifications to the design. The DBAS-INS program allows the designer to create an accurate finite element model for a complex, 3D structure and to complete a preliminary layout and design in a fraction of the time normally required. After analysis, the program checks design requirements per ACI 318-02 (American Concrete Institute 'Building Code Requirements for Structural Concrete') and, based on these results, can automatically modify the design and reanalyze the model.