Non-linear Modelling and Analysis of Structural Impact, Canada, (Deadline: 9 June 2010)

17 May 2010

The ultimate objective of the programme is to provide recommendations for structural modelling and analysis as well as design criteria for structures impacted by a missile.

CONTACT:

Contracting Authority

Daniel J Simard

1601 Telesat Court,

PO Box 1046

Stn B

Ottawa, ON

Canada

K1P 5S9

Phone: (613)990-3361

Fax: (613)995-5086

Email: dan.simard@cnsc-ccsn.gc.ca

Website URL: http://www.nuclearsafety.gc.ca/

DESCRIPTION:

Reference Number 196516

Solicitation Number 87055-10-0165

Organization Name Canadian NUCLEAR Safety Commission

Source ID FD.AG.ON.110577.C11990

Associated Components Yes

Deadline: 2010-06-09 03:00 PM Eastern Standard Time EST

Background:

Public acceptance of existing and new NUCLEAR installations in part depends on demonstrating adequate structural robustness of the installation and the effectiveness of emergency response strategies to avoid or mitigate the effects of the missiles impact. For this reason OECD/NEA/IAGE proposed a Three Phase CAPS (CSNI Activity Proposal Sheets - research program) “Improving robustness assessment methodologies for structures impacted by missiles” with the acronym IRIS_2010. CNSC has collaborated closely with IRSN (France) on the definition and feasibility of this program from the very beginning. The IRSN was named the chair with the CNSC named as vice-chair of the program.

The CAPS began in April 2009 with a kick-off meeting during the OECD/NEA/IAGE meeting in Paris. Twenty organisation from 11 countries (Belgium, Canada, Check Republic, France, Finland, Germany, Japan, Korea, Slovakia Switzerland, and USA) including European Joint Research Centre (JRC) and ITER (Fusion for energy) are participants in this research program. The definition of the first of three robins (phases) is planed until the end of 2009 with one meeting in Paris headquarters at the beginning of October 2009. The benchmark of the First Robin will start in January 2010 and will be finished with a workshop in the last quarter of 2010. The conclusions of the First Robin will be drafted in the first quarter of 2011. The Robins two and three will follow with roughly the same duration.

The objective of the CAPS IRIS_2010 is to develop guidance that outlines effective methods of evaluating the integrity of structures impacted by missiles. It is proposed that various methods be compared in a round-robin study of impact data. The project will use publicly available data from simple reduced scale tests representing NUCLEAR power plant (NPP) structures. Computer codes and modelling approaches used in the analysis will be compared to the data as a means of partially validating the methods for use in missile impact assessments.

The objective of the first robin is to calibrate numerical models (material constitutive laws) using test results. The objective of the second robin is to develop more complex models using constitutive models developed in the first robin. The Objective of the third robin is to develop and assess the design parameters (design criteria, floor response spectra.) based on the models developed in the Second Robin. In each robin a numerical benchmark shall be organized and the test results will be presented, analysed and assessed.

The ultimate objective of the program is to provide recommendations for structural modelling and analysis as well as design criteria for structures impacted by a missile.

Objectives:

The CNSC’s objective in the First Robin (Phase I) is to assess current material constitutive laws for flexural and punching behaviour under impact loading. The goal will be achieved using blind analysis, comparing the results with other participants, assessing the differences and eventually, calibrating material constitutive laws.

Scope of Work:

Three series of non-linear analyses have to be carried out to simulate three tests, as a part of CNSC’s participation in Phase I of the CAPS IRIS 2010 benchmarking activity. One test will be focused on flexural behaviour and the two other tests on punching behaviour of reinforced concrete slabs. The impacted slab, supporting structure and the missile have to be modelled using LS-Dyna software. Necessary sensitivity studies shall be carried out to identify all relevant parameters and to assess critical parameters in the analysis. The necessary drawings and structural proprieties are included in Attachment A as benchmark input data. The final result shall be a blind prediction of test results with justification of modelling, constitutive laws and input parameters which were not given as benchmark input data.

Tasks to be Performed:

4.1 Perform simulations of three tests with the modelling of the impacted reinforced concrete slabs, the structural supports as well as the missiles. The Contractor is expected to use Ls-Dyna models for each simulation.

4.2 Provide all necessary parameters used in the models selected in Task 4.1 (of the slabs, supporting structures and the missile) and provide a justification for each parameter and each technical choice made in the modelling (mash, constitutive laws, input parameters, etc.).

4.3 Carry out the analyses using the models developed in 4.1 with necessary sensitivity studies to define all relevant parameters and to assess critical parameters of the analyses.

4.4 Provide the results of predictive analysis for three tests with all necessary data which will be transmitted to the OECD/NEA/CAPS IRIS_2010 workshop organizing committee. The required format and presentation of analysis results to be transmitted to the organizing committee will be provided by CNSC.

4.5 Document the results of tasks 4.1 to 4.4

4.6 Prepare a presentation to be delivered at the IRIS_2010 Benchmarking Workshop in Paris in order to present the project findings, conclusions and recommendations documented in the Draft Report

4.7 Make any necessary model adjustments including related analyses and revise the draft report following feedback from the CNSC.




Privacy Policy
We have updated our privacy policy. In the latest update it explains what cookies are and how we use them on our site. To learn more about cookies and their benefits, please view our privacy policy. Please be aware that parts of this site will not function correctly if you disable cookies. By continuing to use this site, you consent to our use of cookies in accordance with our privacy policy unless you have disabled them.