Advanced Analysis and Design of Steel Structures (BYG580)

The course provides advanced knowledge, principles, and computer-aided tools for analyzing, designing, and maintaining onshore and offshore structures. The first part of the course focuses on building a fundamental understanding of the elastic-plastic behavior of materials and structures, along with principles of plastic collapse and energy dissipation, including theorems and methods in plastic analysis. The remaining parts of the course cover analysis and design philosophies related to ultimate, serviceability, and fatigue limit states. Additionally, the course discusses applications in collision and dropped-object analysis and introduces guidelines for accidental design situations.

The course consists of three modules.

Module 1: Plastic Analysis of Structures

• Principles of ultimate load design. Theory of plasticity and introduction to numerical analysis. Plastic capacities of cross sections (i.e. axial force, shear, torsion, bending moment capacities and reduced capacities due to force interaction).
• Formation of plastic hinges and collapse mechanisms. Bound theorems of plastic analysis. Plastic capacities of beams and frames.
• Plastic capacities plates/shells under transverse loading, without and with axial load. Plastic load capacities of bolted/welded joints and tubular joints. Plastic load capacities of dented structural element.
• Plastic analysis and design case studies (collision, dropped object analysis and etc). Introduction to Accidental Limit State design guidelines, standards and codes.

Module 2: Analysis and design of thin-walled/plated structures

• Overview of theories of plate bending, local buckling, torsional buckling, lateral torsional buckling and torsional flexural buckling.
• Design of plated structures, thin-walled sections, stiffened plates, plate girders, bridge cross sections and bracing system.
• Nonlinear modelling and analysis of structures for quasi-static and dynamic loadings. Plastic push over analysis, 2nd order analysis, P- Δ analysis, large displacement analysis and time-domain analysis.

Module 3: Analysis and design for fatigue

• Basic fatigue theories and application of civil and offshore steel structures.
• Fatigue load models, fatigue strength curve of structural details and design methods according to Eurocode and DNV.
• General concepts in health monitoring and integrity assessment of structures including fields of applications (i.e. Introduction to structural health monitoring methods and damage detection).