Chapter 9 aisc 14th edition
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Therefore, the plate would be much more likely to have a shear yielding failure by “punching” through the face of the HSS. When a plate is connected to the face of an HSS, the contact area of that plate is relatively small which will consequently have a small shear perimeter. Let us take a look at the shear case first. One based on shear and another based on flexure. In a T-connection, where a connection is made at 90 degrees to an HSS chord wall under out-of- plane loading, there are two main failure modes for the HSS wall being connected to. The dashed lines represent lines along which yielding will likely occur.įigure 2 - Example of a Yield Line Mechanism for HSS moment connection. Figures 2 and 3 show examples of yield line patterns. A good approximation for the flexural capacity of plastification is through a yield line mechanism. Thus, plastification is the design limit state that occurs when steel is stressed beyond its yield strength. However, once it reaches its yield point, the steel will no longer return to its original state and will be permanently deformed when unloaded. The main idea behind yield line theory is that steel is an elastic material which stretches when stressed but will return to its original size and length when unloaded. When one thinks about a load perpendicular to a thin HSS wall from an engineering mechanics standpoint, it does make sense that the HSS wall and a thin concrete slab would behave similarly. Design procedures for extended end plates commonly use the yield line theory, therefore it makes perfect sense that a similar methodology could be applied to HSS walls under out of plane loading. The yield line design publication “Practical Yield Line Design” also notes that yield line theory works well for sizing steel plates in bolted connections for out of plane forces since steel is good at plastic redistribution of stresses. With further research and refinement by many people through the 20th century, the experimental and theoretical results matched really well and were slightly on the conservative side. Yield line theory was originally conceived for concrete slabs by Danish engineer and researcher K. Researching the plastification limit state leads one to a surprising place.
#Chapter 9 aisc 14th edition manual
(15th edition AISC Manual of Steel Construction)
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Figure 1 - Chord Face Plastification Rectangular Truss to Truss Connection