PSE : PETROLEUM STRUCTURAL ENGINEERING®
INTEGRATED STRUCTURAL ANALYSIS AND DESIGN SOFTWARE
FOR OFFSHORE AND ONSHORE STRUCTURES ACCORDING TO THE API 4F (4th EDITION)
Our main objective is to provide fully integrated, innovative and reliable technologies to our users. Our mission is also to ensure better productivity for our end-users.
This is why we are pleased to offer a various technical white papers, where each end-user of the PSE can learn how to use the program leading to a more efficient practice.
1.001 CATENARY CABLES
In the past decades, cable structures have been widely used in engineering applications because of their various advantages such as high strength, large degrees of flexibility, elastic behavior, light weight, the ability to preload and profitable buildings.
1.002 WIND LOADS
SAFI automates wind loads applied to members. These loads are calculated based on the projected area, projected pressures or velocity components approaches. The program offers a variety of wind profiles and automates the determination of the shape coefficients (drag factors). The automation of the drag coefficients is also available for the NBCC-2005, ASCE 7-05, CSA S6-06, HQ SN-40.1, API 4F-2013 and API 4F-1995 codes. Tools are provided to quickly generate wind profiles acting on several directions.
1.003 BUILT UP SECTIONS
The program allows to define built-up sections whose properties are calculated by the means of a finite element model.
1.004 TORSION INCLUDING WARPING OF OPEN SECTIONS
Restrained warping for the torsion of thin-wall open sections is not included in most commonly used frame analysis programs. Almost all frame programs in practice use St-Venant torsion theory ignoring the effects of restrained warping.
1.005 IFC IMPORT
The integration of IFC in SAFI enables importation of models from a large number of architectural and structural software. This new import mode is accessible to the user via the menu: File à Import/Export à Import IFC.
1.006 SEISMIC ANALYSIS
In the PSE Software, three approaches are possible to obtain the maximum displacements and forces of a structure subjected to an earthquake. The first approach is a static equivalent seismic load which is obtained from the equivalent lateral force method. The second and the third approach are a response spectrum analysis and a time-history analysis.
1.007 INTEGRATION LINES
The Integration Line command allows to associate a group of plates and/or members to a reference axis system called an integration line. To define the line, we must specify two points which create the axis passing at the center of gravity of the core.
1.008 SPATIAL OBJECTS & SPATIAL LOADS
Spatial objects are used to model non structural secondary elements attached to the structure. These elements add no stiffness to the existing model. Loads applied to spatial objects are transferred to the structure through one or more attach joints. The loads are transferred using a “rigid plate” approach.
1.009 ADVANCED SECTION STRESS ANALYSIS BY FINITE ELEMENTS
Elastic stresses are calculated by the means of a finite element analysis of the cross section. Two commands are available in the Analysis – Charts – Analysis menu to display the results for the advanced stress analysis.
1.010 VARIABLE INERTIA SECTIONS
The variable sections are sections for which the dimensions vary according to the position on the physical member. Each dimension of the section is interpolated and the corresponding properties are recalculated based on the interpolated dimensions. If the properties of the source sections have been modified by the user, the recalculated based on the interpolated dimensions.
1.011 ADVANCED SOLVER FOR LARGE MODELS
The PSE features a solver based on sparse matrix storage (compressed storage) in order to reduce the analysis time and memory usage of large models analysis. The table below shows two examples of the memory usage of the regular storage (skyline) and the compressed storage.
1.012 DIAPHGRAMS ANALYSIS
When a diaphragm is activated, the program creates a finite elements mesh in the plane of the surface. The plates used in this mesh have no bending stiffness; they have only membrane stiffness (stiffness in the plane).
1.013 AXIAL, SHEAR AND TORSION RELEASES
The PSE allows to specify member end releases on all six degrees of freedom. It is possible to define translational releases and torsional releases at either end of the member (but not both ends).
1.014 NOTIONAL HORIZONTAL LOADS
Real structures contain defects, zones of partial yielding and residual stresses that are not taken into account in the numerical models. For these reasons, and also others, several design codes require the addition of a fictitious minimum horizontal load (notional load) that creates a horizontal deformation of the structure which causes an amplification of the forces and deformations. Note that this load is not a minimum load; it is added to existing horizontal loads (wind, seismic load, etc.).