![]() ![]() All of the options that control the visualisation are accessed in the ‘Axial_Forces’ section of the control panel on the right. You can also view force labels showing the magnitude of force, directly on top of each member, Fig 12. The colourmap corresponds to the colour bar scale that runs horizontally below the 3D view. Two modes are available ‘ Binary’, which indicates tension and compression members by colouring them solid blue and red respectively and ‘ Continuous’ which applies a continuous colourmap that transitions from solid blue (max tension), through white (zero force) to solid red (max compression). Axial forces and reactionsĪxial forces can be viewed with a colourmap applied to the structure. I’ll briefly outline the functionality here. You will get the hang of what each toggle and widget does pretty quickly. Alternatively, just play around with the control panel on the right. For the best overview of the 3D window and its data visualisation functionality, you should watch the getting started video at the top of this article. The best way to get a quick sense of how the structure responds to the applied loads is by reviewing results in the 3D window. Deflections to the right and upwards (positive global x and y-axis directions) are positive and the opposite directions are negative. The sign convention was axial forces is as you might expect compression forces are negative and tension forces are positive. Tables of data output reactions, axial forces and nodal displacements. The operation of the table functions is all fairly intuitive and self-explanatory so we won’t labour each individual piece of functionality here.įig 11. Logged-in members can also download the table data to csv file. The tables are all filterable, sortable and searchable. Provided all indicators in the analysis report are green, we can proceed to review the three tables of data below, which show the reactions, member axial forces and nodal displacements. This is one of the easiest things to overlook in a simple truss analysis, so watch out for a red warning sign here. Otherwise, material non-linearity will lead to the calculator results being inaccurate. In order for the truss calculator results to be valid, all members must remain within their elastic range. The toolbox will issue a warning if the deflection exceeds 10% of the maximum inter-nodal distance, but this limit is itself arbitrary.Ĭheck 11 indicates if any members have exceeded their specified yield stress. You must use your own engineering judgement to assess the acceptability of deflections. Very large deflections, in comparison to the scale of the structure, suggest the structure and/or loading merit further investigation. This gives an indication as to whether or not the calculated deflections are unreasonably large. This number should theoretically be zero, although it will actually be a very small number due to the way small numbers are handled within programming languages.Ĭheck 10 calculates the maximum nodal deflection as a proportion of the largest inter-nodal distance in the structure. Checks 8 and 9 check for horizontal and vertical force equilibrium and report the difference between applied forces and reactions. Pay particular attention to items numbered 8 to 11. Analysis report generated by truss calculator ![]()
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