2D Truss Analysis using OpenSeesPy

This calculator performs the analysis of a 2D planar truss using OpenSeesPy (a Python library), determining the nodal displacements and internal forces of each member.
Technical assumptions
Analysed using linear static analysis
Truss comprises of 8 nodes and 13 members
Supported by a pin support at node 1 and a roller support at node 5
All truss elements have the same cross-section area and Youngs modulus
InputCross-sectional area of truss elements,﻿A
:0.005 m^2​
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Youngs modulus of truss elements,﻿E
:200 GPa​
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Geometry﻿
Parameter diagram
Enter lengths with any units. The truss will be in meters (m) in the output graphs.
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Geometry nomenclature
Applied Force﻿
Parameter diagram
Enter applied forces with any units. All forces in the output graphs will be in kilonewtons (kN).
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Loads location
Output graph
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👉Member force diagram: red (negative) = compression, blue (positive) = tension
Output tableNode & member tags
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Node tags
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Member tags
displacement_list﻿
Node 1: 
Ux = 0.00 mm 
Uy = 0.00 mm
Node 2: 
Ux = -0.20 mm 
Uy = -1.23 mm
Node 3: 
Ux = -0.36 mm 
Uy = -1.31 mm
Node 4: 
Ux = -0.57 mm 
Uy = -1.40 mm
Node 5: 
Ux = -0.77 mm 
Uy = 0.00 mm
Node 6: 
Ux = -0.15 mm 
Uy = -1.20 mm
Node 7: 
Ux = -0.33 mm 
Uy = -1.21 mm
Node 8: 
Ux = -0.50 mm 
Uy = -1.15 mm
internal_forces﻿
Force in member 1 
(nodes 1 to 2.00) is -40.2 kN
Force in member 2 
(nodes 2 to 3.00) is -40.2 kN
Force in member 3 
(nodes 3 to 4.00) is -51.18 kN
Force in member 4 
(nodes 4 to 5.00) is -51.18 kN
Force in member 5 
(nodes 5 to 6.00) is 72.38 kN
Force in member 6 
(nodes 6 to 7.00) is 43.18 kN
Force in member 7 
(nodes 7 to 8.00) is 43.18 kN
Force in member 8 
(nodes 1 to 8.00) is 51.48 kN
Force in member 9 
(nodes 2 to 8.00) is -20.0 kN
Force in member 10 
(nodes 3 to 7.00) is -20.95 kN
Force in member 11 
(nodes 4 to 6.00) is -50.0 kN
Force in member 12 
(nodes 3 to 8.00) is -2.39 kN
Force in member 13 
(nodes 3 to 6.00) is 13.14 kN
Related ResourcesDesign Guide: Trusses
Design Guide: Truss Analysis
Design Guide: Common Truss Types
Beam Analysis using Anastruct

Node 1:	Ux = 0.00 mm	Uy = 0.00 mm
Node 2:	Ux = -0.20 mm	Uy = -1.23 mm
Node 3:	Ux = -0.36 mm	Uy = -1.31 mm
Node 4:	Ux = -0.57 mm	Uy = -1.40 mm
Node 5:	Ux = -0.77 mm	Uy = 0.00 mm
Node 6:	Ux = -0.15 mm	Uy = -1.20 mm
Node 7:	Ux = -0.33 mm	Uy = -1.21 mm
Node 8:	Ux = -0.50 mm	Uy = -1.15 mm

Force in member 1	(nodes 1 to 2.00) is -40.2 kN
Force in member 2	(nodes 2 to 3.00) is -40.2 kN
Force in member 3	(nodes 3 to 4.00) is -51.18 kN
Force in member 4	(nodes 4 to 5.00) is -51.18 kN
Force in member 5	(nodes 5 to 6.00) is 72.38 kN
Force in member 6	(nodes 6 to 7.00) is 43.18 kN
Force in member 7	(nodes 7 to 8.00) is 43.18 kN
Force in member 8	(nodes 1 to 8.00) is 51.48 kN
Force in member 9	(nodes 2 to 8.00) is -20.0 kN
Force in member 10	(nodes 3 to 7.00) is -20.95 kN
Force in member 11	(nodes 4 to 6.00) is -50.0 kN
Force in member 12	(nodes 3 to 8.00) is -2.39 kN
Force in member 13	(nodes 3 to 6.00) is 13.14 kN