ok , why in the author's working , the red area is included ? I think the red area is not included because the horizontal nail is acting at C , so , according to the formula , the A ' is the area is the area that is connceted to the beam at the juncture , so , i think that the red part is not includedPhanthomJay said:
I understand your reasoning, but it is incorrect. Suppose the beam was a solid hollow box, no nails whatsoever, and you wanted to determine the shear stress in the web at b. You would use the full area of the upper flange (7.5 inch width) in calculating Q, and in calculating t, that would be twice the web thickness because there are 2 webs. The entire flange tends to try to slip longitudinally off the webs. It makes no difference to the beam whether it is nailed vertically or horizontally or not at all, as long as there is no slippage, either the nails or the solid wood without nails takes the shear.fonseh said:
Shear stress at different points refers to the distribution of shear stress at various locations along a surface or body. This is often represented by a shear stress diagram, which shows the varying levels of shear stress at different points.
Shear stress at different points can be calculated by dividing the force parallel to the surface by the surface area. This can be represented by the equation τ = F/A, where τ is the shear stress, F is the force, and A is the surface area.
Studying shear stress at different points is important in understanding the behavior of materials under external forces. It can help engineers and scientists design structures and materials that can withstand shear stress and prevent failure.
The effect of shear stress at different points can vary depending on the material. Some materials, like metals, can withstand high levels of shear stress before experiencing permanent deformation or failure. Others, like fluids, have lower shear strength and can easily deform under shear stress.
Yes, shear stress at different points can be controlled or managed through various methods such as using stronger materials, altering the shape or design of a structure, or adding support structures to distribute the stress more evenly. Understanding the distribution of shear stress at different points is crucial in managing and preventing structural failure.
