Description
A cable net structure is subject to vertical loads applied at its interior nodes:
Geometry
Cable area: 0.01 [ft2]
Modulus of elasticity: 3.6×106 [ksf]; Poisson’s ratio: 0.0
Supports: exterior nodes: all DOFs fixed
Loads
as shown above
Reference
“Midas” Verification manual.The manual presents results from three references:
1. John W. Leonard, Tension Structures 1988, pp115-7, McGraw Hill book company.
2. A. Lo, Nonlinear dynamic analysis of cable and membrane structures, 1981, Ph.D. Dissertation, Oregon State University.
3. Baron & Vendatesan, Nonlinear Analysis of cable and truss structures, ASCE, Vol 97, pp. 679-710, 1971, Journal of the Structural Division.
Comparison of Results
| Beam/Node | Result type | Result | Deviation | |||
| Theoretical | STRAP | |||||
| Ref.1 | Ref.2 | Ref.3 | ||||
| Node 21 | Deflection – Z | -0.351 | -0.351 | -0.352 | -0.352 | – |
| Node 21 | Deflection – Y | 0.0366 | 0.0366 | 0.0367 | 0.0367 | – |
| Beam 8 | Axial | 80.0 | 80.0 | 80.0 | 80.1 | 0.13% |
| Beam 24 | Axial | 57.9 | 57.9 | 57.8 | 57.9 | – |