The discussion focuses on calculating shear stress at point P using the formula τ = (V)(Q)/(I)(t). The participants clarify that Ixx is used instead of Iyy due to the vertical shear force of 3 kN applied to the structural member, which aligns with the orientation of the neutral axis parallel to the x-axis. The choice of Ixx is justified not by its greater value but by the direction of the applied shear force. The correct formula for shear stress at P is τ = (V)(Qx)/(Ixx)(t), where Qx is the first moment of the area above point P.
PREREQUISITESStructural engineers, civil engineering students, and professionals involved in analyzing shear stress in beams and other structural elements will benefit from this discussion.
but, the problem ask detremine shear stress at P , not maximum shear stress at P...David Lewis said:
why we need to choose the greater ?David Lewis said:
The last part of the first line of the attachment is unclear. Does it say "... vertical shear force V = 3 kN" ?chetzread said:
Ya , so , what are you trying to say ?SteamKing said:
I'm asking for clarification of the problem statement is all. Part of image is too blurry for me to read.chetzread said:
Yes, it is...SteamKing said:
Do u know why Ixx is used here? Why not Iyy ?chetzread said:
If you would answer my questions in Posts 5 and 7, I could probably tell you.chetzread said:
Yes, it's vertical shear force of 3kN...SteamKing said:
Thanks.chetzread said:
