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Analysis of Post-Tensioned Containment Building for Large Nuclear Components Replacement Luis M. Moreschi, Ph.D., P.E. and Farhad Farzam, P.E. Bechtel.

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Presentation on theme: "Analysis of Post-Tensioned Containment Building for Large Nuclear Components Replacement Luis M. Moreschi, Ph.D., P.E. and Farhad Farzam, P.E. Bechtel."— Presentation transcript:

1 Analysis of Post-Tensioned Containment Building for Large Nuclear Components Replacement Luis M. Moreschi, Ph.D., P.E. and Farhad Farzam, P.E. Bechtel Power Corporation GT STRUDL Users Group 2005 Annual Meeting, Las Vegas - Nevada

2 2005 GT STRUDL Users Group Meeting Presentation Outline  Background Information  Finite Element Analysis – GT STRUDL  Automatic Generation Commands  Modeling of Prestressing Loads  Coordinate Systems: Global & Local Planar Axis  Sequential Construction Simulation  Summary and Conclusions

3 2005 GT STRUDL Users Group Meeting Finite Element Analysis  Purpose: Determine Total Number of Tendons to be Detensioned  GT STRUDL Computer Program - Validated & Verified  Plate/Shell Elements for Containment Cylindrical Wall and Dome Plate/Shell Elements  Spatial Truss Members for Helical Tendons Spatial Truss Members  Model for Prestress Load Model for Prestress Load  Coordinate System Selection Coordinate System Selection  Sequential Construction Simulation

4 2005 GT STRUDL Users Group Meeting Containment Configurations MODEL A Concrete Intact Tendons Tensioned MODEL D Concrete Restored Tendons Retensioned MODEL B Concrete Intact MODEL C Concrete Chipped Tendons Removed/Detensioned

5 2005 GT STRUDL Users Group Meeting Restored Condition + Model C Model D Model for Prestress Load

6 2005 GT STRUDL Users Group Meeting Sequential Construction Simulation Analysis $Perform analysis for concrete chipped LOAD LIST ‘TENDONS DETENSIONED’ STIFFNESS ANALYSIS $Perform analysis for concrete restored ACTIVE ELEMENTS GROUP OPENING‘ ACTIVE MEMBERS GROUP OPENING' LOAD LIST ‘TENDONS RETENSIONED’ STIFFNESS ANALYSIS $ Combine prestress load results from Models C & D CREATE LOAD COMB ‘RESTORED‘ SPECS - ‘TENDONS DETENSIONED’ 1.0 ‘TENDONS RETENSIONED’ 1.0

7 2005 GT STRUDL Users Group Meeting Summary & Conclusions  GT STRUDL is a validated and verified computer program for use on nuclear power projects  Simple and efficient creation of model geometry using generate commands  Importance of proper selection of model global axis  Ability to perform sequential construction simulation analysis (data base management features)

8 2005 GT STRUDL Users Group Meeting Questions/Comments Central Structures Group, Bechtel Power Corporation

9 2005 GT STRUDL Users Group Meeting Plate Elements  8,997 joints  9,078 plate elements  In-plane & bending type of deformations (SBHQ6 & SBHT6; 6-DOF per joint)  Model includes the Equipment Hatch

10 2005 GT STRUDL Users Group Meeting Generate Command $Generate joints for cylindrical wall $ GENERATE 154 JOINT CYL ID 1, 1 R TH 0.0, 2.34 LZ REPEAT 51 TIMES ID 154 LZ DIFF AT $Generate plate elements for cylindrical wall $ TYPE PLATE $ GENERATE 154 ELEMENTS ID 'CW-1', 1 FROM 1, 1 TO 2 WRAP -1 TO 156 WRAP -1 TO 155 REPEAT 45 TIMES ID 154 FROM 154

11 2005 GT STRUDL Users Group Meeting Spatial Truss Members  15,700 members  Unit material properties (E=A=  =1.0)  Thermal load, T  Tendon force, S =  T (1 kip/tendon = 1°F)

12 2005 GT STRUDL Users Group Meeting Generate Member Command TYPE SPACE TRUSS $ $ Generate forward tendons $ GENERATE 154 MEMBERS ID 'FT-1' 1 FROM 1 1 TO WRAP -1 REPEAT 50 TIMES ID 1000 FROM 154 $ $ Generate backward tendons $ GENERATE 154 MEMBERS ID 'BT-1' 1 FROM 2 1 WRAP -1 to REPEAT 50 TIMES ID 1000 FROM 154

13 2005 GT STRUDL Users Group Meeting Model for Prestress Load + Plate Elements Truss Members

14 2005 GT STRUDL Users Group Meeting Model for Prestress Load

15 2005 GT STRUDL Users Group Meeting Global Y Axis Vertical Meridional Membrane Forces due to Self-Weight

16 2005 GT STRUDL Users Group Meeting Global Z Axis Vertical Meridional Membrane Forces due to Self-Weight

17 2005 GT STRUDL Users Group Meeting Global & Planar Coordinate System

18 2005 GT STRUDL Users Group Meeting Global Y Axis Vertical ypyp xpxp xpxp ypyp Domed Roof Cylindrical Wall

19 Global Y Axis Vertical Domed Roof Cylindrical Wall ypyp xpxp xpxp ypyp


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