Castalia S.r.l.
tel. +39.2.26681083
fax. +39.2.26681876


The current version of C.S.E. is able, in short and incomplete synthesis, to perform the following steps (also please look at the audio lessons the mute films and the program card):

    Connections Study Environment Software Program: a fem model imported with equal connections 

  • Read into C.S.E. a Sargon or Sap2000TM, or STAAD PROTM, or MIDASTM, or RISA3DTM, or STRAPTM fem model, or a FEM model written in the .SR4 file format, also finding automatically the members of the structure (well different from finite elements). If the FEM model has been solved, then internal forces will be used, in different load combinations, to execute the checks.

    Connections Study Environment Software Program: addition of beam and trusses dialog 

  • Otherwise, typical automatically-generated small fem models for typical nodes are available (floors, portal frames, splice, beam-to-beam, beam-to-column, bracings, and more).
  • Alternatively, freely create a FEM model inside C.S.E., by using interactive commands. End releases, constraints, connection codes, offsets, orientation, materials, cross-sections, may all be defined inside C.S.E. (independence from FEM programs). It is also possible to create more complex FEM models. If no internal forces are available from a FEM analysis, then the checks will be performed using elastic or plastic limits conveniently factorized, or user-defined internal forces values (copy and paste from EXCEL).           
  • Recognize automatically all the equal nodes (i.e. equal connections)  within the structure, mark them, and categorize them (detection of equal nodes).
  • Have both in a listing and at screen, summary information useful to be the starting point for the joint design. Particularly, for every node listed one can have the envelopes of internal forces, keeping into account variation of both combinations and instances (occurences) of the node at hand. Thanks to this scheme you have quickly the internal forces from which start for the checks (pre-analysis of nodes).

    Connections Study Environment Software Program: a complex connection between several members 

  • Then, for each "node" you have to create a renode, i.e. a real node. You will do that thanks to graphic, interactive commands (like an electronic LEGOTM) or thanks to an already prepared archive of parameterized typical connections (786 families available at May 2015) which the user may further increase.

    Connections Study Environment Software Program: a circular plate with a cut 

  • Add components and work processes (cuts, bevels, face rotations and translations) to a (re)node. You can add plates (rectangular, trapezoidal, triangular, specially-shaped, many shapes available), single or double angles, cross-sections trunks of any kind, constraint blocks, shear keys... (free, interactive building of the renode

    Connections Study Environment Software Program: bolt layout free positioning 

  • Apply bolt layouts, managed with wide generality (rectangular bolt matrices, simple or staggered, made perimetral too, concentric circles, rot-translation of the bolt layout over the chosen face, free bolt positioning). In this phase the internal distances and border distances checks are automatized. The bolts can  be shear-only, or tension-compression as well. Several computational methods are possible (no slip bolts, with or without bearing surface, reacting or not to compression, anchors...).

    Connections Study Environment Software Program: weld layout addition 

  • Apply fillet or penetration welds layouts, also with non orthogonal faces, with automatic recognition of pertinent sides, of lengths and angles.

    Connections Study Environment Software Program: overlapping check 

  • Check for overlapping between 3D objects (overlapping check). Check renode logic (no matter its topology) pointing out components not joined, ill joints, lack of connections (renode chains, check of connection effectiveness).

    Connections Study Environment Software Program: user defined variables 

  • Define new variables starting from pre-defined variables added automatically by the program. Define conditions or checks with the most general freedom, starting from pre-defined variables and user-variables. It is not necessary to know any programming language, because variables and conditions are defined into the program by specific tools (free definition of variables and conditions).
  • Connections Study Environment Software Program: exploitation map 

  • Fully check (automatically) bolt layouts. Shear, tension/compression, parasitic bending if required, and their interaction (N, V, M). Check slip connections. Check anchors. Check no-tension bearing support.

    Connections Study Environment Software Program: a bolt layout in bending exploits no-tension bearing surface help 

  • Check bolt layouts possibly also using no-tension bearing surfaces (flanges, base plates). The bolt layout is checked under six forces (axial force, two shears, torque, bending moments). No matter the space position of the bolt layout, its orientation, absolute or relative, no matter the number of bolts and their actual layout, no matter the number of layouts in the scene, applied to any component, the program computes shear and traction forces in the bolts, at each thickness, and executes automatically bearing stresses checks, punching shear checks, block-tear checks of each plates joined by the bolts. More checks are also available (resistance, net-sections, FEM...). Automatic checking algorithms can be driven by the user thanks to proper settings. The program can keep into account, if required, parasitic bending acting over bolts, and is sensible to bolt diameter (bolt checks, bearing pressure checks). If a bearing surface is defined the program executes non linear computations with no-tension material for the bearing surface.
  • Connections Study Environment Software Program: fillet welds automatic checks 

  • Fully check (automatically) fillet or penetration weld layouts, made up of an arbitrary number of welds, no matter their placement, absolute or relative, the number of weld layouts in the scene, applied to any couple of components among those present in the scene, computing forces per unit length applied to each weld, and executing automatically the checks (fillet and penetration welds check).

    Connections Study Environment Software Program: net cross-section normal stress field 

  • Execute member net cross-section checks fully automatically (axial force plus bending). automatic net sections check)
  • Execute automatically simplified  checks on throughs. (simplified through checks)

    Connections Study Environment Software Program: finite element automatic modelling and stress analysis 

  • Create automatically the finite element models of components (members, throughs) or of sets of components up to the whole node, keeping into account work processes and stiffeners, so as to fine check their stress status. The models are ready to run (static analysis, linear or non-linear, and buckling analysis. The forces applied model single bolts and single welds and, if present, the bearing surface actions (see  here).
  • Print a detailed listing with all the forces applied to each complete layout (bolts and welds) and to each instance of the layout (single bolts and welds), with all relevant results including those referred to components like members and throughs, and those due to user checks. (listing). Automatic creation of a report in ODT (Open Office) or ePUB format.

    Connections Study Environment Software Program: displaced view 

  • Study connection displaced views (displaced).
  • Execute the user-defined checks by adding variables and conditions, in every load combination and renode instance. Add the results of these checks to the listing and see their consequences in false colours on the screen (additional automatic user-checks).
  • Execute a coherence check between the displacements levels allowed by the connections designed in renode, and the end releases added in the finite element model (displacement coherence checks).
  • For the checks executed using elastic and plastic limits or user values (i.e. not using imported fem results), create automatically proper limit-forces combinations, to be applied to members one by one, so as to prove renode effectiveness in different fictitious load states (fictitious automatic combinations of limit forces).
  • For FEM checks, execute automatically the maximum stress check of component in every instance of the renode and in every load combination defined in the fem model, or in every fictitious load combinations (fem combinations check).

    Connections Study Environment Software Program: rendering of designed connection 

  • Export a 3D DXF file with the description of the renode with all its components (export to CAD).
Et cetera...

Take a look at films and program card