3Muri offers a drawing area for insertion of the structure with intuitive controls, an engine for the creation of computation models and their solutions, and a post-processor for immediate presentation of the results and creation of the computation report.
The push-over analysis is the best method to respond to the requests of modern calculation methods for structures in seismic areas, with particular regard to the global ductility calculation.
The displacement verification has replaced the resistance verification, highlighting, by the push-over analysis, the structure criticalities. In addition, in order to understand whether the structure is box-like or not, and thus to carry out the actual push-over analysis, the software has the analysis of local collapse mechanisms for checking the right overtrains. With the same model of calculation, it is also possible to perform static verification, only for vertical loads.
The 3Muri solver has proved particularly reliable through tests carried out by several universities and research centers, national and international, providing results that accurately represent the real structure behavior. This can be seen in studies in which are successfully compared the effects of earthquake on real structures damaged by recent earthquakes (L’Aquila and Emilia) and the numerical forecasts.
With the same calculation model it is also possible to fulfill the static verification, just for the vertical loads.
When the box-like behavior is not sure due to a lack of connections between floors and walls, verification of local mechanisms (the control of the possible separation of walls out of their floor) is necessary. You can use the module Local Mechanisms to verify this, starting from the model used for the global verification. Integrated the model with geometric data, loads and constraints, you can perform the local verifications, just specifying the local area.
To complete the analysis of the structures 3Muri can analyze the foundation structures, examining the distribution of tensions on the ground, the load capacity, the failure of the continuous foundations and the project of foundation plinths made by reinforced concrete.
The Sensitivity analysis is a calculation method useful to obtain a better understanding of the structural functioning and accurate planning of the site investigation plan. As known, doubts during modeling directly affect the evaluation of seismic safety. The sensitivity analysis methodology includes the identification of parameters groups that express the uncertainty degree, through the execution of multiple different non-linear analysis it identifies a level of sensitivity for each parameter in order to furnish a weight in terms of importance. The result is the acquisition of a better knowledge of the structure’s characteristics and the single elements contribution to the global functioning.
The module allows to speed up the calculation by selecting the calculation method and using the multiprocessor. Two different solver parameters are now available: the selection of the calculation method by dense matrices and or sparse matrices and the use of multiprocessor. 3Muri software performs the calculation using the FEM method (finite element method), that needs to know the stiffness matrix K. Performing operations using the sparse matrix algorithms, that can be easily compressed, makes the calculations faster with a less memory use. With the use of the multiprocessor you can perform each different analysis on a different PC processor, saving time.
Some existing structures can’t sustain the supposed seismic intensity, so it may be necessary to make reinforcement works.
Additionally, reinforcement elements may have been added over time to the structure that needs to be taken into account in the calculation model.
NTC Chapter 10 concerns the local modifications and improvements. 3Muri can easily simulate these interventions through a range of reinforcing elements such as chains, FRP applications, reinforced plaster, injections on walls, stiffening of floors etc.
You can also insert new elements such as beams, columns, reinforced concrete walls, steel frames and braces.
If it is not possible to determine the elements, you can make a simulation project using the elements that were expected at the time of the construction of the building.
For the design of these elements there is an automatic connection to the Piano NTC and AxisVM software. Further analysis can be made with the ET Engineering Tools and SaiTu programs.
The BIM methodology is spreading among designers. 3Muri supports this methodology through the construction of the model functions (use of parametric objects), creating interoperability with other softwares (structural and architectural) and developing graphic tables exported automatically from the 3D model.
3Muri is interoperable with BIM technology through IFC files (Industry Foundation Classes format), whose specifications are based on a neutral format of data, designed to describe, exchange and share project informations. The command “IFC export” in the File menu allows you to create the IFC file. This file includes the structural objects defined by the IFC standard in order to be visible with a reader or BIM2CAD. The import of IFC models is realized through the software BIM2CAD, included with the module, which allows you to read IFC files and automatically export horizontal sections in DXF format, which can be used as plants in 3Muri.
Graphic Tables Module
When there is a modification or improvement of existing buildings, it is often necessary to carry out works on the structures (walls, roofs, beams, columns etc…). You can demolish existing structures, build new structures or make improvements, using for example reinforced plaster or diatones. Using 3Muri Graphic Tables Module you can export plans, sections , elevations in DWG format with details of planned operations, designer notes, dimensiones. You can also manage the different steps of the project, exporting the demolitions and new constructions table. There will also be a report including a list of the planned works and the cost estimate.