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
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 = 0.50 mm 
Uy = -3.59 mm
Node 3: 
Ux = 0.91 mm 
Uy = -3.34 mm
Node 4: 
Ux = 1.24 mm 
Uy = -2.88 mm
Node 5: 
Ux = 1.58 mm 
Uy = 0.00 mm
Node 6: 
Ux = 0.19 mm 
Uy = -2.73 mm
Node 7: 
Ux = 0.46 mm 
Uy = -2.89 mm
Node 8: 
Ux = 1.25 mm 
Uy = -3.41 mm
internal_forces﻿
Force in member 1 
(nodes 1 to 2) is 100.66 kN
Force in member 2 
(nodes 2 to 3) is 100.66 kN
Force in member 3 
(nodes 3 to 4) is 83.93 kN
Force in member 4 
(nodes 4 to 5) is 83.93 kN
Force in member 5 
(nodes 5 to 6) is -104.91 kN
Force in member 6 
(nodes 6 to 7) is -63.25 kN
Force in member 7 
(nodes 7 to 8) is -63.25 kN
Force in member 8 
(nodes 1 to 8) is -117.39 kN
Force in member 9 
(nodes 2 to 8) is 60.0 kN
Force in member 10 
(nodes 3 to 7) is 75.89 kN
Force in member 11 
(nodes 4 to 6) is 50.0 kN
Force in member 12 
(nodes 3 to 8) is -62.58 kN
Force in member 13 
(nodes 3 to 6) is -41.67 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 = 0.50 mm	Uy = -3.59 mm
Node 3:	Ux = 0.91 mm	Uy = -3.34 mm
Node 4:	Ux = 1.24 mm	Uy = -2.88 mm
Node 5:	Ux = 1.58 mm	Uy = 0.00 mm
Node 6:	Ux = 0.19 mm	Uy = -2.73 mm
Node 7:	Ux = 0.46 mm	Uy = -2.89 mm
Node 8:	Ux = 1.25 mm	Uy = -3.41 mm

Force in member 1	(nodes 1 to 2) is 100.66 kN
Force in member 2	(nodes 2 to 3) is 100.66 kN
Force in member 3	(nodes 3 to 4) is 83.93 kN
Force in member 4	(nodes 4 to 5) is 83.93 kN
Force in member 5	(nodes 5 to 6) is -104.91 kN
Force in member 6	(nodes 6 to 7) is -63.25 kN
Force in member 7	(nodes 7 to 8) is -63.25 kN
Force in member 8	(nodes 1 to 8) is -117.39 kN
Force in member 9	(nodes 2 to 8) is 60.0 kN
Force in member 10	(nodes 3 to 7) is 75.89 kN
Force in member 11	(nodes 4 to 6) is 50.0 kN
Force in member 12	(nodes 3 to 8) is -62.58 kN
Force in member 13	(nodes 3 to 6) is -41.67 kN