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

Problem Statement Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest  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 IRIS Project 2008 – 2012

Specimen Description Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest  Geometry IRIS Project 2008 – 2012

Specimen Description Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest  Reinforcement IRIS Project 2008 – 2012

Testing Specifications Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest  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/m 2 Diwydag bars:  Reinforcement grade: σ y =500MPa IRIS Project 2008 – 2012

Considerations Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest 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

Numerical Model Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest  ATENA – Cervenka Consulting  Number of elements in total: 1136  Wall itself: 640 second order rectangular elements IRIS Project 2008 – 2012

WP1 TESSH Performance Prediction Contest IRIS Project 2008 – 2012 Material Models CP-IP 213968-2 Risk Reduction System Integrated European Industrial

Boundary Conditions Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest  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

Boundary Conditions Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest  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

External Forces Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest Weight of machine Prestress The weight of the top beam included; only weight of machine added as external loading IRIS Project 2008 – 2012

Shear Loading Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest 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

Shear Loading Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest  Horizontal loading applied on top beam only +50t -50t IRIS Project 2008 – 2012

Load History Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest F max =7.0MN 8,00 7,00 6,00 5,00 4,00 3,00 2,00 force [MN] 1,00 0,00 -1,00 -2,00 -3,00 -4,00 -5,00 -6,00 0,0 50,0 100,0 150,0 200,0 250,0 cycle number IRIS Project 2008 – 2012

Load-Displacement Curve Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest F max =7.0MN 8,00 7,00 6,00 5,00 F f = 5.2MN 4,00 3,00 target: 7.5MN 2,00 force [MN] 1,00 0,00 -1,00 -2,00 -3,00 -4,00 -5,00 -6,00 -6,0 -4,0 -2,0 0,0 2,0 4,0 6,0 8,0 displacement [mm] IRIS Project 2008 – 2012

Crack Development Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest  +350t -350t  +450t -450t IRIS Project 2008 – 2012

Crack Development Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest  +550t -550t  +600t -600t IRIS Project 2008 – 2012

Crack Development Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest  +650t -600t +700t (filtered) -700t (filtered)  IRIS Project 2008 – 2012

Summary Integrated European Industrial Risk Reduction System CP-IP 213968-2 WP1 TESSH Performance Prediction Contest » F max =7.0MN F f =5.2MN (target: 7.5MN) + -  Final crack patterns  After unloading IRIS Project 2008 – 2012