structural-analysis

What it does

Examines offshore structure integrity by performing stress calculations (Von Mises, principal stresses, maximum shear) for given loading, conducts plate buckling analysis using elastic and Johnson-Ostenfeld corrections, runs column buckling checks per EC3, and verifies member capacity under combined loading with safety-factor based conclusions. It supports standard references including DNV-RP-C201/202/203, API RP 2A, ISO 19902, AISC 360, and Eurocode 3, and provides concrete implementations for stress, buckling, and capacity calculations.

How it works

• Includes a StressCalculator class that computes beam bending stress, various forms of stress (shear, torsional, hoop, longitudinal) and methods to derive Von Mises stress, principal stresses, and max shear from a StressState.
• Defines MaterialProperties and provides sample materials (S355, S420) with typical steel properties.
• PlateBucklingAnalyzer uses elastic_buckling_stress based on plate geometry and boundary conditions, then applies Johnson-Ostenfeld correction, followed by a combined check for plate buckling under multiaxial loading to produce a BucklingResult (critical_stress, applied_stress, utilization, safety_factor, mode, passes).
• ColumnBucklingAnalyzer implements EC3-based checks for Euler buckling, slenderness, and a reduction factor chi; computes design capacity N_cr and utilization, returning a BucklingResult.
• Capacity in MemberCapacityChecker includes check_tension_member for plastic vs net-section governing capacity and check_combined_loading (partially shown) for axial and bending interactions, producing a CapacityResult with capacity, demand, utilization, governing_mode, passes, and details.
• The implementation patterns include example Python code sections showing dataclasses, stress calculations, buckling utilities, and capacity logic, with explicit formulas and parameters.

When to use it

• Von Mises stress calculations
• Plate buckling checks (DNV, API standards)
• Member capacity verification
• Combined loading assessment
• Weld strength verification
• Safety factor reporting
• Standards compliance documentation

What it can touch

• Uses material definitions via MaterialProperties (e.g., STEEL_S355, STEEL_S420)
• References standards such as DNV-RP-C201, DNV-RP-C202, DNV-RP-C203, API RP 2A, ISO 19902, AISC 360, Eurocode 3
• Interacts with classes PlateGeometry, BucklingResult, CapacityResult, StressState, StressCalculator, PlateBucklingAnalyzer, ColumnBucklingAnalyzer, MemberCapacityChecker

Caveats

• License: MIT
• Version 1.0.0 (Python 3.10+ compatibility is stated; tested on 3.10-3.13)
• The skill provides implementation patterns and example code; actual numerical results depend on input values and material data
• It describes multiple interacting analyses; users must supply consistent units and scaling (e.g., MPa, N, mm, etc.) to ensure correct results