# Recent content by shogun000

1. ### Boundary Conditions for a beam with two supports

Yes sorta makes sense now! Thank you all!
2. ### Boundary Conditions for a beam with two supports

at x=8 I'd say the shear force is negative R3. Edit: replaced R2 instead of R3.
3. ### Boundary Conditions for a beam with two supports

Ahh! Negative R3 because the force R3 has to bring the shear to 0 at x=9.
4. ### Boundary Conditions for a beam with two supports

I'd say the shear is positive R1 at x=1m.
5. ### Boundary Conditions for a beam with two supports

I've attached my working out. Hope that clarifies things! Sorry about the orientation, I can't seem to rotate it.
6. ### Boundary Conditions for a beam with two supports

I've attached the part of the solution, Macauly's notation is being used to formulate the equation of shear force.
7. ### Boundary Conditions for a beam with two supports

Sorry my bad! I meant: at x=9 Shear force=R3 But in the solutions it's: Shear force= -R3 I don't see why it's negative R3. I already have the values of R2 and R3 from the question. It's just a matter of determining the shear force at the extremes of the beam.
8. ### Boundary Conditions for a beam with two supports

That brings me back to my initial problem, at x=9 Shear force=R2 But in the solutions it's: Shear force= -R2 I don't see why it's negative R2.
9. ### Boundary Conditions for a beam with two supports

From what I understood in lectures, the shear force at the ends of the beam has to be equal to the reaction force going through the beam given that they are point loads. The bending moment at each end is 0.
10. ### Boundary Conditions for a beam with two supports

1) I assumed the deflection at both ends is zero. But that doesn't mean the shear is zero? 2) The supports don't seem to provide any bending moment.
11. ### Boundary Conditions for a beam with two supports

Homework Statement I'm trying to find the boundary conditions for the beam shown in the figure. Homework Equations Notation: V= Shear force M= Bending moment The Attempt at a Solution at x=0 V=R1, M=0 at x=9 V=R3, M=0 In the solution provided at x=9 V=-R2. I don't understand why it's...