Product Features

ModelingModels can be created from ANSYSsoftware Models can be created from FEMGVExtensive data input flexibility using parameters and file merging via @filenameAll data files easily editableSection library for beamsFreedom releases to permit pin and sliding connectionsStiffened plate structure modelingCartesian, cylindrical and spherical coordinate systemsFamily of force–equilibrium membranes and shear panels to represent areas in which high shear flows are evident2- and 3-node bars and beams including tubes and box elements with local and global offsetsFull range of solid elements including high accuracy 8-node and 20-node bricks, 6- and 15-node wedges, 10-node tetrahedral, and 15- and 20-node laminated elementsLow- and high-order shell elements with thick and thin shell formulationsSpecial crack elements and a shell-brick interfaceMost elements can be used for field problems (heat transfer, etc.)Isotropic, orthotropic and anisotropic materialUnits can be modified within the dataPressure loads and accelerations from an ANSYS® AQWA™ analysis can be added automaticallyStiffened plate definitions

ANSYS ASAS

Offshore Structural Assessment

Proven Technology for Design and Analysis of Offshore Structures

Offshore structure projects today require that design and analysis of are performed efficiently in terms of time and money. Engineering simulation softwaremust be powerful, fast and easy to use.

Comprehensive Simulation Capabilities with ANSYS ASAS Technology

ANSYS® ASAS™ software provides an integrated facility for performing structuralassessment of most types of offshore structures including jackets, jack-ups, concrete gravity-based platforms, risers, floating productions on storage andoffloading (FPSOs), TLPs, semi-submersibles and, of course, ships. Two packagesare available. ANSYS ASAS software is a general-purpose analysis capability withlinear and nonlinear options including code checks. Model creation can be performed via ANSYS® software or with FEMGV®. The ANSYS ASAS Offshorepackage extends ANSYS ASAS to include modules for wave loading,soil–pile–structure interaction and spectral fatigue due to wave and wind loading.ANSYS ASAS Offshore is designed primarily for the assessment of framed struc-tures such as jackets, jack-ups, subsea templates, risers and topsides.

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ANSYS ASAS PackageThe ANSYS ASAS package is the basic building block for performing linear and nonlinear finite element analysis. Unlike many other systems, the ANSYS ASAS packagehas powerful capabilities to address both continuous and framed structures includingcode checks. The package contains three main solvers plus a number of special modules to provide tremendous flexibility and power. ASAS(L) primarily is a linear solver(although it includes gap elements) with static and dynamic capability. A wide range ofelements are available including solid, shell and plates coupled with a set of beam elements coupled with a library of standard cross-sections. Key aspects regarding thesolver are high capacity (even in 32-bit PC environments); modal response includingcomposite mode damping, multipoint constraints and rigid elements; load case combination and factoring even from separate simulations; and multi-level sub-structuring with automatic superelement connectivity. ASAS(NL) extends ANSYSASAS software into the nonlinear domain including plasticity, dynamics, buckling andlarge deflections. Also included is fully coupled wave structure interaction with both regular and irregular (random) waves. Response amplitude operators (RAOs) may beimported from ANSYS® AQWATM software as a time history forcing function for simulation of floating body effects. BEAMST, the third solver in the ANSYS ASAS package, performs code checks to various codes of practice for framed structures (jointchecks and member checks) including AISC 10th edition working stress and 2nd editionLRFD; API RP2a-WSD 21st edition working stress (updated in 2007) and RP2A-LRFD1st edition; BS5950 part 1 1992; NORSOK 2000; NORSOK, NS3472 1984; NPD 1992;DS449 1984 (with 1994 amendments); and DS412 1984 (with 1994 amendments).

Product Features

ANSYS ASAS PackageMulti-level substructure analysis for higher productivity and modeling efficiencyLoad case combinations and factoringSet and group definition for efficient analysis managementJoint flexibility for tubular jointsDynamic analysis in both frequency and time domainComposite mode damping in frequency domain Hysteretic damping in time domainLocal and global bucklingLarge displacementPlasticity with various laws including partial plasticityCreep with various laws including user-definedFracture including line–spring formulationMultiple load cases with full range of load types including nodal, pressure, distributed, face and element temperatures, body forces, centrifugal loads and angular accelerationSeismic analysisTransient nonlinear heat conduction analysis capabilities including convection and radiation; time-dependent thermal loads automatically transferred to stress analysisTube-in-tube analysis including contactComposite material analysis for shells and bricksLaminated, woven roving and choppedstrand material definitionsComposite elastic failure covered by Azzi–Wu, Norris, Tsai–Wu, maximum stress or maximum strainComposite inelastic failures covered bycombination of Tsai–Wu, and maximum stress laminate and lamina definitions

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Nonlinear dynamic responseof a blast wall subject to apressure pulse

Hysteretic damping effect

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Product Features

Code ChecksMember and joint code checks performed to most commonly used codes and kept up-to-dateReports for data input, members and unity checksIntermediate forces and stresses along a memberFiber stresses produced for standard or user-defined sectionsNew load cases by combining and factoring existing casesLocal buckling and column buckling checksDifferent joint types can be specifiedResponse spectrum analysis results can be processedSearching facilities to obtain maximum stresses and forcesCan perform code checks for members with elastic deformations within nonlinear analysis

Wave LoadingWave theories include linear wave (Airy), solitary wave (Cnoidal 1st), Stokes fifth-order, stream function and shell new wave (dispersive wave)Input of wave kinematics in the form of a grid of velocities and accelerationsForces on submerged sections calculated using Morison's equationDrag and mass coefficients can be default, user-defined or calculated from a table of Reynolds and/or Keulegan–Carpenter numbersLinear, exponential or user-defined current variationMarine growth with optional drag coefficients and densitySelf weight and buoyancy calculated forsome or all membersFull hydrostatic loading effects on members calculated including induced end loads

ANSYS ASAS Offshore packageThe ANSYS ASAS Offshore package extends the ANSYS ASAS package by adding fourmore solvers. ASAS-WAVE/MASS calculates the wave loading and added mass ontubular framed structures such as jackets. A range of wave types are available applicable to shallow and deep water conditions. SPLINTER performs soil–pile–structureinteraction and soil–pile interaction; FATJACK performs deterministic and spectralfatigue analysis of jackets and topside structures constructed from framed members.Finally, WINDSPEC carries out spectral fatigue analysis of tubular structures such asflare towers or cranes subject to wind loading.

ANSYS ASAS Offshore software, developed over a period of more than 30 years, hasbeen honed through continuous applications in the demanding North Sea environment, where more than half of all jacket structures have been designed with theaid of ANSYS ASAS.

Variable distributedloading displayed onmembers

Jacket and jack–up structureswith coupled wave–structureinteraction

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Key Characteristics of ANSYS ASAS PackagesThe ANSYS ASAS packages provide a number of special features intended to makethe simulation process as efficient and effective as possible. Integrated database: Results from the various solvers are written onto a databaseso individual modules will always work with correct data.Direct interfaces from Microsoft® Excel® and Mathcad®: When ANSYS ASAS software is installed, additional functions are added enabling all the ANSYS ASASresults to be accessed and retrieved for report writing or further post-processing.ANSYS ASAS Toolkit: This is a collection of routines that are provided within theinstallation in the form of a library and .dll. The library is used in conjunction with theuser's own FORTRAN routines.ASAS-VISUALIZER: This is a graphical post-processor that has been especially written for ANSYS ASAS software. Beyond displaying model information and results,the visualizer can make use of ANSYS ASAS sets for model clarity. Facilities exist toscan results for worst cases and present these in a concise format for report generation.

ANSYS ASAS is a software package that is part of the ANSYS comprehensiverange of applications that collectively satisfy the demanding engineering anddesign requirements of the offshore industry. Other software packages includeANSYS® AQWA™ for the simulation of multi-body floating structures including diffraction–radiation, mooring configurations and articulations and ANSYS®

AutoReaGas™ for the simulation of explosion and blast effects on topside modulesand similar configurations. The ANSYS ASAS suite is supported by ANSYS®

Mechanical™ simulation tools and ANSYS® CFX® plus FLUENT® computational fluiddynamics packages. ANSYS offers the most complete range of solutions for theoffshore industry from front-end engineering and design (FEED) studies throughglobal analysis to component design. Solutions are available for contractors, consultants, fabricators, certification authorities, operators and equipment manufacturers.

Product Features

Soil–Pile–Structure InteractionSingle pile or pile groupVariable pile cross-sectionsAutomatic subdivision of piles based on pile cross-section and number of soil layersAutomatic calculation of Mindlin coefficients for pile groups Automatic generation of P-Y andT-Z curvesEfficient nonlinear solution for soil–pile–structure interactions via superelement approachStress recovery to structural elements following convergenceTangent and secant stiffness methods for iterating with nonlinearP-Y and T-Z curves for soilSkewed system option for constraints or loadingNon-tubular cross-sections and tubes within tubesLinearized pile cap stiffness option

Spectral FatigueTubular framed structures subject to waves and current or wind including wind gustsScott–Weigel, Jonswap, Pierson–Moskowitz or user-defined wave spectraEmpirically derived stress concentration factors including Efthymiou influence functionsUser-defined stress concentration factors for both box and tubular membersWave spreading effects