Shell20 - Prestress Applied to Area Objects
- Gokhan Alkan (Unlicensed)
Example Description
This model prestress applied to area objects is verified in this example using a simply supported concrete beam with a parabolic prestressing tendon profile and different eccentricities at each end. The deflection, and the top and bottom stresses, at the beam center are compared with independent hand- calculated results.
This model has two options for modeling the effect of the prestress. One option models the prestress as loads applied to the structure. The other models the prestress tendon as internal tendon elements. Both options are verified in this example.
In this model the beam is modeled using a 4x10 area object mesh. Thus, each area object is 7.5 inches high by 36 inches long. This yields an aspect ratio of 4.8.
Two separate models are used in this analysis. Model A has the prestress modeled as loads. Models B treats the prestress as elements.
The effect of both wobble and curvature friction losses are included in the example as well as elastic shortening of the concrete beam. The tendon is stressed from the left end only.
Important Note: Shear deformations are included in this example.
Tested Features
- Prestress tendon with parabolic tendon profile and different eccentricities at the two ends
- Prestress tendon modeled using loads and applied to area objects
- Prestress tendon modeled as elements and applied to area objects
- Prestress losses