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KPG is a Biomedical Design Engineer, Computational and Experimental Mechanics Specialist, Engineering Failure Analysis with world-class expertise in engineering design and analysis services in biomedical device design, product design, analysis, test protocols, design verification tests and product documentation for FDA IDE submission of novel biomedical devices. Finite element and computational fluid dynamics analyst for design and analysis of various products requiring non-linear materials.
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There are numerous types of building structure types: wood frame and truss; light weight metal studs and trusses; pre-cast wall; conventional beam and column; and rigid frame. External surfaces also vary and may fall into different categories: wood, masonry, pre-cast concrete, metal panels and others.
All building structural engineers must produce designs meeting the requirements of specified design criteria (ASD or LRFD) and all applicable code loads, as specified by national, state and local building codes such as IBC, ASCE-05, UBC, SBC and others. The applicable code loading requirements cover wind, snow and seismic requirements, among others.
Most building designs may be evaluated using commercially available matrix analysis programs, which also perform individual member structural stability and code checks. However, some structures do not lend themselves to evaluation by such programs. Rigid frame structures constructed of welded plate components require the use of advanced finite element analysis (FEA) techniques in order to evaluate their performance.
This example is a welded rigid frame with wall height of 30', peak height 35', and free span 86'. The proposed design utilizes welded plate construction, with web stiffeners at key points, including the roof crown, the structure “hip” and the based of each leg.
The FEA model is constructed using MSC-MARC/MENTAT commercial software. Te model element mesh is shown in Figure #1 with superimposed loading combinations. The model incorporates 9,596 nodes and 4,608 solid elements representing the thick plates. Analysis load combinations include full, IBC live, dead, wind and snow loads. This model allows performance evaluation for individual load cases, as well as specified combinations, including dynamic modal analysis or dynamic responses to a full spectrum of seismic loads.
Details of the model may are illustrated in Figures #2, #3, and #4 for the frame hip, peak and base, respectively.
Analysis results are presented in Figures # 5 through #8. Figure #5 is a contour map of frame displacement under applied load. Figures #6, #7 & #8, show the distribution of combined (Von Mises) stress levels in the knee, peak and base, respectively.
Note that the combined loading condition produces peak stress levels at the interior surface of the knee of 45.9 Ksi, and the maximum vertical displacement is 3.92 inches at the frame peak.
Fig. #1 - Model Element mesh with Applied Loads
Fig. #2 - Hip Mesh Details
Fig. #3 - Frame Peak Details
Fig. #4 - Leg Base Detail
Fig #5 - Frame Displacement Under Combined Lo
Fig #6 - Maximum Von Mises Stress Levels at Frame Knee
Fig. #7 - Stress Distribution at Frame Peak
Fig. #8 - Stress Distribution at Frame Base
Read other articles by this KKAI Associate:
Non-Linear Sliding Contact Analysis Of Surgical Clamp
Biomedical Lead Body Simulation
Load and Displacement Of An Injection Molded Housing
| Biomedical Design Engineer, Computational and Experimental Mechanics Specialist, Engineering Failure Analysis, engineering design and analysis services in biomedical device design, product design, analysis, test protocols, design verification tests and product documentation for FDA IDE submission of novel biomedical devices. Finite element and computational fluid dynamics analyst for design and analysis of various products requiring non-linear materials. | |
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Kevin Kennedy & Associates, Inc.
Rapid Response Engineering® Solutions
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