Opportunities and Challenges of Structural Engineers when Using BIM
Daniel Dlubal's bachelor's thesis focuses on presenting and highlighting the chances, advantages, and opportunities of BIM when performing the structural analysis and design of buildings. The essential information of a structural analysis is shown and the data exchange between the CAD and the structural engineering software is explained in detail as well.
Moreover, the thesis focuses on the challenges, obstacles, and difficulties that can occur when using BIM. Deriving the structural system of a BIM model as one possible issue, as well as the limit of application, will be examined more closely.
Author
Mr. Wopperer works in public relations, with a special focus on social media.
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There is a known complexity in calculating footfall response on irregular floors or staircases of any type. Footfall Analysis uses the RFEM model and the modal analysis results of RF-DYNAM Pro - Natural Vibrations to predict the vibration levels at all locations on a floor. A rigorous analysis method is essential to enable an accurate investigation of the dynamic behavior of the floor.
The software incorporates the most up-to-date analysis procedures, allowing the user to select between the two most often used calculation methods available, namely the Concrete Centre Method (CCIP-016) and the Steel Construction Institute Method (P354).
- Footfall Analysis links with RFEM, using the model geometry from there, thus the user is not required to create a second model specifically for footfall analysis
- Allows the user to analyze any type of structure for footfall analysis, irrespective of the shape, material, or use
- Quick and accurate predictions of resonant and impulsive (transient) responses
- Cumulative measurement of vibration levels – VDV analysis
- Intuitive output enabling the engineer to advise improvements of critical areas in a cost-effective way
- Pass/fail limit check in accordance with BS 6472 and ISO 10137
- Selection of excitation forces: CCIP-016, SCI P354, AISC DG11 for floors and stairs
- Frequency weighting curves (BS 6841)
- Quick investigation for full model or specific areas
- Vibration Dose Analysis (VDV)
- Adjusting the minimum and maximum walking frequencies as well as the walker’s weight
- User input damping values
- Varying the number of footfalls for resonant response, user input or software calculated
- Environmental response limit based on BS 6472 and ISO 10137
- Overall maximum response factors and critical nodes
- Resonant analysis (maximum response factor, RMS acceleration, critical node, critical frequency)
- Impulsive (transient) analysis (maximum response factor, peak acceleration/velocity, RMS acceleration/velocity, critical node, critical frequency)
- Vibration dose values for both resonant and impulsive analyses
Charts
- Response factor vs walking frequency
- Mass participation vs eigenmodes
- Velocity time history
- 3D incompressible wind flow analysis with OpenFOAM® software package
- Direct model import from RFEM or RSTAB including neighboring and terrain models (3DS, IFC, STEP files)
- Model design via STL or VTP files independent of RFEM or RSTAB
- Simple model changes using Drag and Drop and graphical adjustment assistance
- Automatic corrections of the model topology with shrink wrap networks
- Option to add objects from the environment (buildings, terrain ...)
- Wind load determined over the height of the building, depending on standard-specific parameters (velocity, turbulence intensity)
- K-epsilon and K-omega turbulence models
- Automatic mesh generation adjusted to the selected depth of detail
- Parallel calculation with optimal utilization of the capacity of multicore computers
- Results in just minutes for low-resolution simulations (up to 1 million cells)
- Results within a few hours for simulations with medium/high resolution (1‑10 million cells)
- Graphical display of results on the Clipper/Slicer planes (scalar and vector fields)
- Graphical display of streamlines
- Streamline animation (optional video creation)
- Definition of point and line probes
- Display of aerodynamic pressure coefficients
- Graphical display of turbulence properties in the wind field
- Optional meshing using the boundary layer option for the area near the model surface
- Consideration of rough model surfaces possible
- Optional use of a seond-order numerical Order
- Multilingual user interface (for example, German, English, Spanish, French)
- Documentation possible in the RFEM and RSTAB printout report
I have imported a DXF file to RFEM. Unfortunately, the scaling of the model is not correct and has to be reduced. How can I change the scale?
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