Engineering Practice Problem for a Pin-Connected Frame

engineerintraining · Apr 28, 2022

Diagram of a pin-connected portal frame with supports at A and B, a 10 kip horizontal load at the left top corner, spans of 6 ft each and 9 ft height, with hand-drawn reaction arrows labelled RAx, RAy, RBx and RBy.

Have identified what i need to find, but not sure how to proceed since there is a pin in the centre, do I treat it as two separate structures?

berkeman · Apr 28, 2022

engineerintraining said:

Homework Statement:: Stuck on solving this practice problem for the pin connected frame
Relevant Equations:: 2D Equilibrium, Fx, Fy, M

View attachment 300720
Have identified what i need to find, but not sure how to proceed since there is a pin in the centre, do I treat it as two separate structures?

Welcome to PF.

Per the PF Rules, you need to show your work before we can help. So yes, start by treating it as two separate structures and show the FBDs please. Thank you.

engineerintraining · Apr 28, 2022

Hand-drawn free-body diagram of a pin-connected two-member frame on grid paper, with reaction forces labelled R_Ax, R_Ay, R_Dx, R_Dy, R_Bx, R_By, a 10 kN load arrow, and angle theta marked.

this is what I have, then based on this i was thinking that i could assume this:

Handwritten equations on grid paper: R_Dy = R_By and R_Dx = R_Bx, with subscripts D, B, x and y.

Does that look right?

Orodruin · Apr 28, 2022

Sure. That is the force equilibrium for the right part. What else can you deduce?

Engineering Practice Problem for a Pin-Connected Frame

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