Metal 3D and the Integrated 3D structures of CYPECAD have the following new features.
In previous versions of the program, the automatic calculation of the susceptibility to local buckling due to compression was already included assuming that each of the flat elements making up the section buckled in an isolated manner (independent from the rest), and the possibility was included, for any other type of buckling other than the individual type to be considered, to modify the local buckling coefficient which affects the slenderness parameter associated to each element. In this new version, the automatic calculation of the susceptibility to local buckling due to compression considering the possibility that several elements can buckle together as if they were a single element, is also included, hence combined buckling modes are obtained. The program is able to detect and analyse the buckling in a group of elements in the following cases:
The combined buckling is also studied if the elements making up the section have been stiffened, which is commonly referred to as buckling due to distortion. Regarding the stiffened elements, a new assistant has been implemented for the design with standard reinforcement in accordance with that exposed in EC9.
In this new version, aluminium sections requiring longitudinal welds can now be introduced in the Special aluminium sections editor. The program checks these sections taking into account the reduction of the resistance properties which arise in areas close to these welds: where the elastic limit of the material is affected significantly. The softened zone is referred to as the HAZ (heat affected zone), its extent and severity are calculated by the program.
The design process of special aluminium sections has been optimised by now obtaining the shear plastic areas, as well as the reductions which, because of the tangential stresses due to the torsional moment and shear forces, arise when subject to normal forces: axial force and bending moments. This way, in checks where in previous versions, an elastic analysis was used (in accordance with the plastification criteria exposed in EC9), now a plastic analysis is carried out and, therefore, improved usage factors are obtained.
Metal 3D now allows for structural analysis models to be imported from IFC files. IFC files which only contain the physical model and not the structural analysis model, do not contain any information which Metal 3D can read.
In IFC format files, the structural analysis model is composed of structural type entities, such as nodes, bars, loads, etc. Additionally, the relationship between nodes and bars is defined in an explicit way by means of fixity conditions. It is similar to the model a user would define in Metal 3D.
The entities Metal 3D currently imports from the IFC files are the following:
These basic features regarding the import of IFC files do not require any special permits in the user license, hence any user whose license includes the 2012 version of Metal 3D will be able to import IFC files with the indicated properties.
Metal 3D carries out the import of IFC files into a new job with the aid of a data introduction assistant. When a new job is created (File > New) the program allows to choose between two options:
At the end of the import process, a list is displayed with all incidences that were incurred, if any.
The following rolled steel codes have been implemented for the five joints modules (Joints I, Joints II, Joints III, Joints IV and Joints V):
In the Joints V. Flat trusses with hollow structural sections module, three new types of joints are designed: Bolted splice connection with two CHS elements, Bolted splice connection with two RHS elements, Knee KT joint.
The design of these joints has been implemented for all the available codes in the Joints V module taking into account the design criteria of CIDECT (Comité International pour le Développement et l’Etude de la Construction Tubulaire).
For the program to design truss splice connections, the joints must be analysed using the option Resolve all nodes with bolted connections with the choice of ordinary or prestressed bolts. Using this option, welded connections of the truss will be designed as welded.