For multi-story wood buildings, I have very often seen the wall studs spaced at 16” o.c. and the trusses spaced at 24” o.c. The trusses bear on a double top plate across the top of the wall studs. This typical configuration will result in every other truss bearing at midspan between the wall studs (the top plates behave as a beam over multiple supports). When analyzed as a built-up member, the double top plates are adequate for both flexure and shear. However, in order to behave as a built-up member, the plates must be fastened together so that they satisfy shear flow, VQ/I. Every time I perform this calculation the result is multiple 10d nails at a prohibitively tight spacing. What am I missing here? Trusses at 24” o.c. on a double top plate on studs at 16” o.c. seems to be common practice, but it does not appear to work.
Red Flag Submitted
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action.
Reply To This Thread
Posting in the Eng-Tips forums is a member-only feature.
In this ebook, we'll explore how additive manufacturing is going to transform the way cars are made. This includes commentary from thought leaders such as Ford's CTO, Ken Washington, Customer case studies of ways 3D printing is being used today, and a variety of part examples where 3D printing is already impacting how automobiles are made. Download Now
Learn how Kawasaki optimized automotive and aerospace production processes to save 85% of estimated outsourcing costs by bringing in BigRepâ€™s large-format additive manufacturing systems. And, how efficient workflow and logistical integration helped earn back their investment in just 6 months. Download Now
New technologies and approaches present great opportunities for semiconductor manufacturers to achieve high levels of innovation, yield and improvement. This white paper explores some of these cutting-edge technologies and how they can be applied effectively in the semiconductor industry. Read about how Smart Manufacturing is transforming the semiconductor industry. Download Now
Organizations using simulation and analysis tools effectively see the benefits in their ability to achieve certification faster and with drastically less total cost than those who do not maximize these tools. Read this White Paper to learn about how digital tools such as analysis and simulation help in aircraft structure certification. Download Now