Title: Comparison Between GTStrudl Integrated and Partial Model Analysis
1Comparison Between GTStrudl Integrated and
Partial Model Analysis
Power Generation Enginnering Services company
- Case study ATF Power Plant CTGSTG Building
foundation
A Presentation Submitted to GT STRUDL Users
Group24th Annual Meeting Training Seminar Year
2012
1
2PGESCo.
- 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
3Table 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
4Introduction
- 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
5Purpose
- 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
6Steam Turbine Generator Combustion Turbine
Generator Building Integrated Model
6
7Pile Caps, piers Grade Beam Layout
7
8Pile Springs Layout
8
9Integrated 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 .
9
10- 4 Piles Foundation Layout
10
11Integrated versus Partial Model Results
Lateral Dir ( X Dir )
11
12Lateral 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
13Vertical 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 Layout
14
15Integrated versus Partial Model Results
Lateral Dir ( X Dir )
15
16Lateral 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
17Vertical 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 Layout
18
19Integrated versus Partial Model Results
Lateral Dir ( X Dir )
19
20Lateral Dir ( Z Dir )
20
21- 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
22Vertical Dir ( Y Dir )
22
23- 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
24Piles Reactions Summary in Metric Tones
Footing types Max single pile reaction M-Tons Max single pile reaction M-Tons Max single pile reaction M-Tons Total piles reaction M-Tons Total piles reaction M-Tons Total piles reaction M-Tons
Footing types Partial Model Integrated Model Diff. 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 1525.75 1403.2 8.03
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
26Section cut for 9 PilesIntegrated Model
Section cut in Pile caps for bending moment
results
Section cut for 9 PilesPartial Model
26
27Pile 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 short direction in M-tons Bending Moment in short direction in M-tons Bending Moment in long direction in M-tons Bending Moment in long direction in M-tons Bending Moment in long direction in M-tons
Footing types Partial Model Integrated Model Diff. 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 6.0 312.4 271.3 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
28Effects of modeling on the steel structure
- Comparison of the bracing and columns forces
between the integrated model and the separate
steel model.
28
29The Steel Building Model
29
30The Steel Building with foundation Integrated
Model
30
31Bracings Results
31
3232
3333
3434
35The Results of Columns
35
3636
3737
3838
39Advantages 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
40Disadvantages 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
41Conclusion
- 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
42THANKS