1. PreOpenSeesPost: a Generic Interface for OpenSees
Dr. Jens Peder Ulfkjær
Swiss Federal Institute of Technology Zurich
Institute of Structural Engineering,
Group of Professor M. H. Faber Chair of Risk and Safety

2. Requirements for the program Generic generation of structures
Introduction
Requirements for the program
Generic generation of structures
Outline of the program
Presentation of the program
Simulation tool
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3. The initial idea was to have a program that could
Requirements
The initial idea was to have a program that could
Generate many different structural geometries in a generic and consistent way
Be able to generate geometries that are irregular
Be able to generate large number of input files for a Finite Element program
Have a framework for stochastic analyzes
To be able to do non-linear modelling, both material and structural
To visualise the input and output parameters
To do advanced data analysis on the output data
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4. Decision
It was decided to use the open source Finite Element program OpenSees as the calculation core as it is developed for earthquake engineering and provides advanced materials models for both reinforced concrete and soil.
To handle the generic generation of structures, to visualize the results and for post analysis the program Matlab was chosen.
A method for generating generic structural geometries was developed based on a virtual grid in which structural elements could be placed, both in the grid and away from the grid.
In MATLAB all the information is stored in one large data structure, making changes easy and efficient
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5. Generic generation of structures
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6. Structure of program Generate model Model: Figure 1: Files called:
Data structure
Command platform
Define*.m
Visualise model, run
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Generate*.m
OpenSees
and
visualise results
Write tcl-file
Files called:
Write*.m
Tcl file
Run OpenSees
Output Data Files
Update Model

7. The user most do the following
User requirements
The user most do the following
Manually create the input files containing:
Info about the calculation
Size of problem (Dimension DOF)
The grid via three vectors
The cross sections
Material parameters inclusive damping
The constrains and loads
The solving algorithm
Or use the Guide to give the same parameters
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8. Command to start PreOpenSeesPost
After the input has been prepared the system is started by writing something like:
Model=GenerateModelPlay('T1','',1,1,9,2);
T1 - House Type T1
‘R’ - Repaired cross sections
‘1’ - Write Switch
‘1’ - Figure Switch
‘9’ - Plot Nodes
2 - Plot DOF
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9. T1 Introduction Requirements Generic generation Outline program
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32. Time Displacement plot
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33. T2 Introduction Requirements Generic generation Outline program
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34. T3 Introduction Requirements Generic generation Outline program
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35. T4 Introduction Requirements Generic generation Outline program
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36. T5 Introduction Requirements Generic generation Outline program
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40. Simulation tool Introduction Requirements Generic generation
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41. 128 lines Introduction Requirements Generic generation Outline program
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42. The Guide Introduction Requirements Generic generation Outline program
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43. Guide Introduction Requirements Generic generation Outline program
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44. Guide Introduction Requirements Generic generation Outline program
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45. Guide Introduction Requirements Generic generation Outline program
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46. Guide Introduction Requirements Generic generation Outline program
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47. Guide Introduction Requirements Generic generation Outline program
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48. Guide Introduction Requirements Generic generation Outline program
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49. Guide Introduction Requirements Generic generation Outline program
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50. Guide Introduction Requirements Generic generation Outline program
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51. Guide Introduction Requirements Generic generation Outline program
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52. Guide Introduction Requirements Generic generation Outline program
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53. Guide Introduction Requirements Generic generation Outline program
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55. What has been implemented: Elements:
Conclusion
What has been implemented:
Elements:
1) Non-linear beam columns, force and deformation
2) Beams with hinges
3) FourNodeQuadUP element for soil (Pore pressure)
Materials
1) Concrete01, Concrete02 and Concrete03
2) Steel01 and Steel02
Solvers for
1) Static analysis
2) Push over analysis
3) Transient analysis.
A user friendly interface is under development
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56. A interface between OpenSees and the user has been developed.
Conclusions
A interface between OpenSees and the user has been developed.
The interface is based on consistent and generic principles
Several elements, material models and solution algorithms are implemented
Parameter studies are to be conducted
A generic method for the stochastic simulations will be developed.
More damage indices should be implemented and tested
Generic modeling of the soil and the interface between soil and the structure needs to be done in a generic way
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57. Thank you for you attention.
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