WP1 Nuclear Industry Performance Prediction Contest Adrian Bek - - PowerPoint PPT Presentation

IRIS – Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 Nuclear Industry

Performance Prediction Contest

Adrian Bekö

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

IRIS Project 2008 – 2012

Problem Statement

 Shear test of thick a shear wall under cyclic loading  Using a self-equilibrated testing apparatus  Actuators placed at the middle of the height of the test sample to minimize bending  Objective:  Predict the performance of the test specimen based on the supplied information

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

Specimen Description

 Geometry

IRIS Project 2008 – 2012

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

Specimen Description

IRIS Project 2008 – 2012

 Reinforcement

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

Testing Specifications

 Concrete strength equals 54MPa  Equipment mass attached to the upper beam 23,256kg  Mass of the upper beam 10,000kg  Load cases - vertical loads on the wall : LC1 - V=33,3t LC2 - V=60t (a vertical force of 26.75t to be applied by hydraulic cylinders)  10 equal cycles with 50t horizontal load after in increments of 50t for 2 full cycles each until failure  horizontal transverse prestress of 5 MN/m2 Diwydag bars:  Reinforcement grade: σy=500MPa

IRIS Project 2008 – 2012

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

Considerations

To model the test as close to reality as possible  As it is a self-equilibrated system it cannot be considered infinitely stiff  It would be anchored at the base to some extent  The top will be constrained to limit uplift

 (we did not have the information about keeping the top beam straight

with such a sophisticated mechanism)

IRIS Project 2008 – 2012

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

Numerical Model

 ATENA – Cervenka Consulting  Number of elements in total: 1136  Wall itself: 640 second order rectangular elements

IRIS Project 2008 – 2012

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

Material Models

IRIS Project 2008 – 2012

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

Boundary Conditions

 Vertical supports on 4 pads not to have too much stiffness

size of contact patch by assumption

 Horizontal supports at the and facets of the side

analogous to loading

IRIS Project 2008 – 2012

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

Boundary Conditions

 Additional horizontal support in the transverse direction on the symmetry plane – for numerical reasons  Interchangeable control of the top for the + and - load directions always on the uplift side only

IRIS Project 2008 – 2012

• +

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

External Forces

Weight of machine Prestress

The weight of the top beam included; only weight of machine added as external loading

IRIS Project 2008 – 2012

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

Shear Loading

force vs. displacement control ?  Difficulties with applying displacements:

 concentrated local stresses – change of model

would have been required

 due to bending of the top beam horizontal

displacements are not equal on the whole side

 Force was selected for the loading  Mixed control strategy:

 Reach target load on ascending part of the cycle

for the first time

 Record displacement at prescribed load  For the rest of the cycle control the

displacements

IRIS Project 2008 – 2012

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

Shear Loading

 Horizontal loading applied on top beam only +50t

• 50t

IRIS Project 2008 – 2012

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

Load History

IRIS Project 2008 – 2012

• 6,00
• 5,00
• 4,00
• 3,00
• 2,00
• 1,00

0,00 1,00 2,00 3,00 4,00 5,00 6,00 7,00 8,00 0,0 50,0 100,0 150,0 200,0 250,0 force [MN] cycle number

Fmax=7.0MN

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

Load-Displacement Curve

IRIS Project 2008 – 2012

• 6,00
• 5,00
• 4,00
• 3,00
• 2,00
• 1,00

0,00 1,00 2,00 3,00 4,00 5,00 6,00 7,00 8,00

• 6,0
• 4,0
• 2,0

0,0 2,0 4,0 6,0 8,0 force [MN] displacement [mm]

Fmax=7.0MN Ff = 5.2MN

target: 7.5MN

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

Crack Development

 +350t

• 350t

 +450t

• 450t

IRIS Project 2008 – 2012

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

Crack Development

 +550t

• 550t

 +600t

• 600t

IRIS Project 2008 – 2012

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

Crack Development

 +650t

• 600t

 +700t (filtered)

• 700t (filtered)

IRIS Project 2008 – 2012

Integrated European Industrial Risk Reduction System CP-IP 213968-2

WP1 TESSH Performance Prediction Contest

Summary

» Fmax=7.0MN Ff=5.2MN (target: 7.5MN)  Final crack patterns  After unloading

IRIS Project 2008 – 2012

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