Hi all,
I have a question regarding Beam Results Sign Convention. If there are the query about this one, Please excuse if I ask again.
1. When I try to investigate the result. I noticed that in Beam End Forces Summary Tab (Beam118.jpg), the value of Mz is -1.9 kN-m.
2. When I Check in graphs (Beam118_Graphs.jpg), The Value of Mz is still -1.9 kN-m. The same convention in Beam End Forces Summary.
3. But when I check in Beam End forces All Tab (Beam118_All.jpg). The convention becomes positive.
In our calculation workflow, we normally extract values from Beam End Forces All tab as Im afraid that there will be discrepancy especially when designing Beam Reinforcement.
Please enlighten me about this one.
Thank you all in advance. Attachment below.
Let me explain the sign convention for beam end forces to you.Let for a beam start node is Node no 1 and end node is node no 2. Now assume the first node has negative force and the second node has positive force. If you plot the axial force Fx at the two nodes following the convention that positive Fx is along the positive direction of local x axis (from node 1 to node 2) and vice versa, you will see that the axial force in the member is tensile. So, you need to check the beam local axis and accordingly align the member forces to know the nature of force.
Hope this helps.