Roof Truss Stress Analysis

Learn truss analysis methods with examples.

Roof truss stress analysis.

At the beginning the analytical method is used for determination of values of external supports axial forces and principal stresses in truss. In this free version of 2d truss analysis you can t perform dynamic analysis which contains graphical analysis of designed structure. Permanent dead loads self weight of long span aluminium roofing sheet 0 55mm gauge thickness 0 019 kn m 2 weight of ceiling adopt 10mm insulation fibre board 0 077 kn m 2 weight of services 0 1 kn m 2. This lecture offers a review of the method of joints for analyzing a determinate roof truss.

2 0 load analysis span of roof truss 7 2m spacing of the truss 3 0m nodal spacing of the trusses 1 2m. Service class of roof truss. The methods used for carrying out the analysis with the equations of equilibrium and by considering only parts of the structure through analyzing its free body diagram to solve the unknowns. Load analysis i dead loads on rafter top chord self weight of long span aluminium roofing sheet 0 55mm gauge thickness 0 019 kn m 2 weight of purlin assume 50mm x 50mm african mahogany hardwood timber.

For additional information visit. The truss solver can handle extremely large structures of more than 10 000 members. Method of joints for truss analysis. Then the computational method is used for the solution of the same problems.

Internal forces and stress along members. Stresses in roof trusses in designing roof trusses two stress and two frame diagrams are generally drawn one of each for the dead loads which act vertically and the others for wind loads usually taken as normal to the slope. Example roof truss analysis 3 6 stability determinacy assume that truss is externally statically determinate for gravity loads num forces 33 3 36 num eqns 18 x 2 36 therefore stable determinate dead load roof ceiling wt. The values for internal forces and stresses for each individual member are displayed.

Span of roof truss 4 8m spacing of the truss 2 0m nodal spacing of the trusses 1 2m. The truss analysis is being performed by our fea solver which is also used in our structural 3d program. The analytical and computational method of the roof structures are presented. Analysis of truss by the methods of joints and by the methods of section is explained in the article.

The objective of truss analysis is to determine the reactions and member forces. Weight psf 20 ga metal deck 2 5 waterproof membrane with gravel 5 5. The calculations made are based on splitting the member into 10 smaller elements and calculating the internal forces based on these.