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- engineering analysis
- Use of galvanized box nails may result in shear walls with a shear capacity significantly below the nominal unit shear capacities given in SDPWS.
- Thus, the majority of WSP shear walls have a shear capacity with a high degree of design value variability. This may have unintended consequences that are unknown and unappreciated by the professional engineering and/or building design community.
- Once SBCA and SBCRI were certain their testing and engineering analysis was consistent and repeatable, they were persistent in bringing all WSP shear wall performance issues to the attention of APA, AWC, ICC-ES and ICC.
I had an interesting conversation recently with an engineer that I have known for at least 15 years.
Given that our industry is in the component design and engineering business, which is closely related to the building design business, accurate and reliable engineering is central to every CM’s future success.
A lot of engineering goes into the design of metal plate connected wood trusses, including the connector plates themselves.
- Based on the recommendations of the IRC, IBC and ASCE 7, truss or rafter uplift connections should be designed for applied wind loads using MWFRS analysis.
- Individual truss and rafter members should be designed using C&C generated wind loads.
- The SBCA Load Guide includes information about uplift connections for structural building components.
We sincerely encourage all SBCA CM Members to read this article on SPIB's Supplement #9, which contains an in-depth analysis of a series of next steps that all members should consider implementing that are intended to provide a best practices roadmap.
- The future holds great promise for component manufacturers, as we continue to evolve our collective engineering acumen.
- Greg Brooks’ online blogs gave us an opportunity to share the great work taking place at SBCRI.
- Our industry is at a pivotal moment in its history with regard to the value of the engineering that goes into producing structural building components
- When analyzing a girder truss, the Truss Designer needs to keep in mind the assumptions the truss analysis program makes regarding reaction capacities.
- It is the Building Designer’s responsibility to verify the capacity of the bearing surface, but the Truss Designer must ensure that the truss-to-bearing connection has a chance of being made without crushing.
- The article provides a series of concepts to use if a truss needs to be designed without knowing the bearing surface type and its feasibility of providing adequate support for the trusses.
- Everyone buying raw materials for structural components or conventional framing applications is purchasing design values and related properties for use in engineering equations to resist loads for a given load path.
- It is not well known that lumber design values are global in nature and not specific to the piece of lumber being used.
- Design values written into the building code become the law, whether they are scientifically correct or not.
- If the law is treated forthrightly as written, professional engineers have great value in the market.
- When the IRC provides a solution that cannot be supported by testing of real buildings in a code-compliant application of braced walls, more accurate and technically correct engineered solutions will never be able to compete.
- There is some resistance in the market to establishing standard factors for product equivalency or system performance because it may result in non-wood products graining an advantage over traditional OSB market share.
- A top testing priority for SBCA is “Framing the American Dream III,” which seeks to test a typical stick framed roof and compare its performance to an identical engineered truss roof.
- Applied loading take-offs are critical to truss design efficiencies.
- Communication between the Truss Designer and Truss Design Engineer is key to minimizing truss design inaccuracies.
- The SBCA Load Guide is a free tool that can help Building Designers and everyone involved in the truss design process ensure that the applied loads are correct.
- The truss industry’s innovative products and software form the link between new science-based discoveries and their application.
- The mission of any professional engineering endeavor is to deploy innovative materials, designs or methods of construction that meet or exceed all regulations, protect the consumer and preserve free and unfettered competition as the rule of trade.
- The ICC and AWC have published and through code adoption provide as law nominal unit shear capacity values, which are to be applied in accordance with the installation requirements of the building code and/or the code referenced WFCM and SDPWS.
- Our goal at SBCRI has been to provide a technically reasonable foundation upon which to make engineering judgments when designing braced wall panels for lateral load resistance.
- True creative innovation can only take place within the light frame construction industry when there is an accurate technical foundation.
Truss placement diagrams (TPDs) may be one of the more misunderstood documents in our industry.
SBCRI Testing & SBCA Research Reports can transform your market.
When it comes to code compliance for your new product, consider a road less traveled that can be much quicker and more robust than the traditional path.
optimization using SBCRI truss assembly test data.
- A repair may not be needed if, after adding the holes, visually graded lumber still meets an adequate grade according to the appropriate grading criteria.
- The Combined Stress Index (CSI) is the summation of axial and bending stresses divided by their respective allowable stresses, which represents the structural “efficiency” of the member; the CSI shall not exceed 1.00.
- Coordinating with trades before construction is a good way to avoid holes and notches in trusses, and the costly repairs associated with them.
When designed and installed correctly, components can greatly reduce the time and materials required to frame a structure.
Can designing with lateral resistance in mind improve production QC?
Remember: when you calculate the fire resistance of component assemblies, you have options!
What will happen if the plies of a multi-ply girder truss are not fastened together properly? Overloading and, potentially, chord fractures can occur.
Here’s a quick history lesson. In reviewing public documents surrounding the 2010 Final Action Hearing of the ICC with regard to proposals RB31-9/10 and RB87-9/10, one would gather the following information:
"If I have one hand in the oven, and my other hand is in the freezer, on average, I would think I’m doing alright!” This was a typical analogy used by Dr. Stanley K. Suddarth, Ph.D., P.E., in this case, to demonstrate the potential problems associated with using averages in calculations. When Stan Suddarth passed away on June 9, 2011, in Newburg, Oregon, he left behind a significant legacy in academia and the structural building components industry. In 1986, he was one of the first two inductees into the SBCA Hall of Fame in recognition of his considerable contributions to the industry.
Explore the two different methods used to calculate a wall panel’s capacity to resist applied lateral loads.