1. Comparison Between GTStrudl Integrated and Partial Model Analysis
Power Generation Enginnering & Services company
Comparison Between GTStrudl Integrated and Partial Model Analysis
Case study: ATF Power Plant CTG&STG Building foundation
A Presentation Submitted to:
GT STRUDL Users Group24th Annual Meeting & Training Seminar
Year 2012 1

2. PGESCo.
PGESCo stands for (Power Generation Engineering Services Company).
Established in 1994
Located in Cairo, Egypt
Focused on EPCM Projects (Engineering, Procurement, Construction and Management)
Produced more than 20,000MW 2

3. Table of contents Introduction Purpose
STG & CTG Building Integrated Model
Integrated versus partial model analysis
Pile reactions summary table
Pile caps Bending Moment summary table
Advantages and disadvantages of full modeling method
Conclusion 3

4. Introduction
A comparison will be performed between separate models of the steel frame and the foundation ( Partial Model) and a model that combines the steel structure and the foundation (Integrated Model).
The comparison reflects the redistribution of loads on piles and the measure for that will be the difference in pile reactions in both cases. 4

5. Purpose
The purpose of this study is to investigate whether using the integrated model will yield any savings in the number of piles & foundations sizes compared to the conventional approach of partial models. 5

6. Steam Turbine Generator & Combustion Turbine Generator Building Integrated Model6

7. Pile Caps, piers & Grade Beam Layout7

8. Pile Springs Layout
Include a smaller window to better illustrate the pile springs by including one pile cap only 8

9. Integrated versus Partial Model Results
The Next Slides will show 3 types of foundation and compare the results between the integrated versus the partial model.
4 Piles foundation .
6 piles foundation .
15 piles foundation .
Include a smaller window to better illustrate the pile springs by including one pile cap only 9

10. 4 Piles Foundation Layout10

11. Integrated versus Partial Model Results
Lateral Dir : ( X – Dir )
Add title 11

12. Results Summary ( 4 piles found. Lateral Dir)
Lateral Dir : ( Z – Dir )
Results Summary ( 4 piles found. Lateral Dir)
The Reactions in piles decreases by 55 %.
The maximum pile Reaction decreases by 55 % . 12

13. Results Summary ( 4 piles found. Vertical Dir)
Vertical Dir : ( Y – Dir )
Results Summary ( 4 piles found. Vertical Dir)
The Reactions in pile No.1 and No.4 increases by 20 to 25%.
The Reactions in piles No.2 and No. 3 decreases by 18 to 22%.
The maximum pile Reaction decreases by 18% . 13

14. 6 Piles Foundation Layout14

15. Integrated versus Partial Model Results
Lateral Dir : ( X – Dir ) 15

16. Results Summary ( 6 piles found. Lateral Dir)
Lateral Dir : ( Z – Dir )
Results Summary ( 6 piles found. Lateral Dir)
The Reactions in piles decreases by 15 %.
The maximum pile Reaction decreases by 15 % . 16

17. Results Summary ( 6 piles found. Vertical Dir)
Vertical Dir : ( Y – Dir )
Results Summary ( 6 piles found. Vertical Dir)
The Reactions in pile No.1 and No.6 increases by 2.6 %.
The Reactions in piles No.4 and No. 5 decreases by 2.7 %.
The maximum pile Reaction decreases by 2.7 % . 17

18. 15 Piles Foundation Layout18

19. Integrated versus Partial Model Results
Lateral Dir : ( X – Dir ) 19

20. Lateral Dir : ( Z – Dir ) 20

21. The Reactions in Some piles increases by 2.4 to 79 %.
Results Summary ( 15 piles found. Lateral Dir)
The Reactions in Some piles increases by 2.4 to 79 %.
The Reactions in some piles decreases by 19 to 28 %.
The maximum pile Reaction decreases by 19 % . 21

22. Vertical Dir : ( Y – Dir ) 22

23. The Reactions in Some piles increases by 5.2 %.
Results Summary ( 6 piles found. Vertical Dir)
The Reactions in Some piles increases by 5.2 %.
The Reactions in Some piles decreases by 6.0 %.
The maximum pile Reaction decreases by 6.0 % . 23

24. Piles Reactions Summary in Metric Tones
Footing types
Max single pile reaction
M-Tons
Total piles reaction
Partial Model
Integrated Model
Diff. %
5 Piles footing
112.5
105.6
6.13%
527.1
524.3
0.53%
6 Piles footing
120
104.2
12.95%
632.9
580.5
8.27%
8 Piles footing
108.1
95.40
11.75%
749.2
681.1
9.08%
9 Piles footing
118.5
98.3
17.05%
876.1
808
7.78%
15 Piles footing
116.7
106.3
8.91%
1403.2
8.03%
Add some notes for explanation. Use it to help you in the presentation. 24

25. Conclusion
The changes in lateral force on piles in both directions X & Z is significant .
It shows that all piles act together to carry the lateral forces so it decreases the maximum pile reaction in the lateral direction.
This will save piles in case the govern design force is due to seismic or wind.
For the Vertical Forces in piles there are changes in the values decreases the maximum pile reaction. And this could save piles 25

26. Section cut for 9 Piles Integrated Model
Section cut in Pile caps for bending moment results
Section cut for 9 Piles Partial Model
Replace with a table. Easier to see Add notes to explain.
Section cut for 9 Piles Integrated Model 26

27. Pile caps Bending Moment summary table in Metric Tones
A Section was taken at the face of the pier for each pile cap and the
results are summarized in the following table:
Footing types
Bending Moment in short direction in M-tons
Bending Moment in long direction in M-tons
Partial Model
Integrated Model
Diff. %
5 Piles footing
383.9
305.1
20%
201.5
212.3
-5.4%
6 Piles footing
392.5
367.8
6.0%
164.3
159.1
-3.2%
8 Piles footing
358.7
336.5
312.4
271.3
13.3%
9 Piles footing
534.5
487.4
8.8%
345.4
364.4
-5.5%
15 Piles footing
219.8
257.8
-17%
519.0
534.3
-3% 27

28. Effects of modeling on the steel structure
Comparison of the bracing and columns forces between the integrated model and the separate steel model. 28

29. The Steel Building Model29

30. The Steel Building with foundation Integrated Model30

31. Bracings Results 31

32. 32

33. 33

34. 34

35. The Results of Columns 35

36. Replace with a table for ease of comparison
Replace with a table for ease of comparison. Is there a purpose for the rest of the numbers? 36

37. 37

38. 38

39. Advantages of full modeling method
Serves to get the optimum number of piles and pile caps size.
Approximate simulation of the exact
distribution of the loads.
Effect of any modification in structural steel model will be automatically incorporated in the foundation analysis and vice versa. 39

40. Disadvantages of full modeling method
Regarding The effect on the steel structure, the results shows a great effect on the bracing and column which could help in the reduction of the steel structure weight .
The results of the steel need more time and effort to confirm these reduction . 40

41. Conclusion
Using the integrated model can reduce the total number of piles for each pile cap. This is achieved specially when the max pile reaction from the partial model analysis exceeds the max allowable pile load by 8%.
Comparing the bending moment resulting from the integrated and partial models proved that The overall change in the values of moments will have no significant effect on the design of pile caps sections.
The Integrated model can reduce the Steel structure weight by using smaller section due to the reduction of forces in the members, we should do more effort to proof this conclusion for the steel . 41

42. THANKS