Jayme McColgan Posted May 15, 2023 Share Posted May 15, 2023 i need some guidance on understanding how the influence lines work. I'm trying to determine if the Center Point Loads on my spanner trusses are too much but the truss website gives me a lbs rating but Braceworks uses lbf-ft for everything. Quote Link to comment
Vectorworks, Inc Employee jcogdell Posted May 16, 2023 Vectorworks, Inc Employee Share Posted May 16, 2023 The first thing to do is to turn most of them off so only a single line is visible, this makes it far easier to see the data that the line is presenting. Personally the Du (Deflection unified) is the first thing I tend to look at as this gives a very quick indicator of whther the truss is overloaded and can be compared with the manufacturers load charts Another option is to use the Nx (or force normal) line as this will show the force acting on the truss at a given point Its also a good idea to adjust the inflence line scaling in the braceworks settings to make it easier to see the lines. Another option if you are using a hoist as a drop, is to look at its high hook weight equivalent field in the Hoist object properties, this will tell the load acting on the spreader truss at that point. This is a good option if the truss you are working with doesn't have a Braceworks cross section available in the database. Quote Link to comment
Jayme McColgan Posted May 18, 2023 Author Share Posted May 18, 2023 On 5/16/2023 at 5:45 AM, jcogdell said: The first thing to do is to turn most of them off so only a single line is visible, this makes it far easier to see the data that the line is presenting. Personally the Du (Deflection unified) is the first thing I tend to look at as this gives a very quick indicator of whther the truss is overloaded and can be compared with the manufacturers load charts Another option is to use the Nx (or force normal) line as this will show the force acting on the truss at a given point Its also a good idea to adjust the inflence line scaling in the braceworks settings to make it easier to see the lines. Another option if you are using a hoist as a drop, is to look at its high hook weight equivalent field in the Hoist object properties, this will tell the load acting on the spreader truss at that point. This is a good option if the truss you are working with doesn't have a Braceworks cross section available in the database. because we mostly do shows in ballrooms, if we are doing spanner truss its probably connected directly to the truss below it and not using any drop down motors. i guess for the sake of running weights i could fake it and add a drop motor to get the weights and then put it back before sending it off for approval. Quote Link to comment
Vectorworks, Inc Employee jcogdell Posted May 19, 2023 Vectorworks, Inc Employee Share Posted May 19, 2023 An easier option is to use the truss cross label, once you do a calculation the truss cross will display the force being transmitted trough the connection point, using your document units Quote Link to comment
Jayme McColgan Posted May 26, 2023 Author Share Posted May 26, 2023 sweet! using Newtons as the force should be fine for me. i can convert that to pounds pretty easly. thanks! Quote Link to comment
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