Hi, this is my first post, currently, I have a 2D model which I need to draw the load path, most of it has been done however I am unsure about this section with this cantilever, I am unsure whether the load path would be going upwards or downwards in this section.
I've drawn an arrow going in both directions but I'm really unsure if its correct, I've been given this by a friend to help solve, the black arrows represent vertical loads and the red arrows the load vectors.
if the load is down (inertia load) then the bottom member is in compression and the upper (inclined) member is in tension.
if the load is up (wind load ?) then opposite reactions.
btw, the inclined member needs to resist bending (if it has transverse loads along it's span). But it is still reasonable to assume pinned connections.
"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.
the laods are going down but in this case the load vectors need to show the route a load would take to reach the foundations with the least resistance or aka the shortest path, its essentially impossible to observe but I'm trying to figure out if the best path would be up the diagonal section and down through the vertical sections or down the diagonal sections, across the connected horizontal section and then down the vertical sections.
well your picture only shows a tiny portion of the structure, I thought this is what you were interested in.
going into the truss in general it is harder to see the reaction directions. But draw some direction (maybe tension in all members) ... a positive means you had the direction correct, a -ve menas you have compression.
"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.
There is no "best", "shortest route", or "least resistance" involved in a load path, there is only the flow of the forces through the members based on statics. For the loads on the cantilever there is no single load path. There are forces following multiple paths to multiple supports. Each connection and member along each path must be evaluated for the loads flowing along and through those members and connections.
The three figures below indicate similar structures. Fig. 1 does not show the support locations, so it is impossible to know what the truss forces are in all of the members. Figs. 2 and 3 indicate two possible support conditions; red arrows represent reactions.
Boundary conditions must be known before you can solve the problem.
Red Flag Submitted
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action.
Reply To This Thread
Posting in the Eng-Tips forums is a member-only feature.
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Metal 3D printing has rapidly emerged as a key technology in modern design and manufacturing, so it’s critical educational institutions include it in their curricula to avoid leaving students at a disadvantage as they enter the workforce. Download Now
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now
RE: Basic Load paths
if the load is up (wind load ?) then opposite reactions.
btw, the inclined member needs to resist bending (if it has transverse loads along it's span). But it is still reasonable to assume pinned connections.
"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.
RE: Basic Load paths
RE: Basic Load paths
going into the truss in general it is harder to see the reaction directions. But draw some direction (maybe tension in all members) ... a positive means you had the direction correct, a -ve menas you have compression.
"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.
RE: Basic Load paths
RE: Basic Load paths
Boundary conditions must be known before you can solve the problem.