Analytical capability for predicting structural response of NPP concrete containments to severe loads
A survey has been conducted of the state-of-the-art of analytical techniques for predicting the structural response of concrete containment buildings under severe accident conditions. Such models must be able to describe concrete behaviour with and without steel reinforcement across the complete stress range, from initial elastic behaviour to and beyond the point of failure. For reinforced and prestressed concrete, segregated models (where concrete and steel are independently simulated) are preferred. Existing constitutive models for mass concrete are reviewed, focussing on necessary features for describing the near-peak and post-peak stages of deformation. Special attention is dedicated to the localisation of strains in tension and the post-peak softening behaviour. Existing models for representing the concrete steel bond are reviewed. These models are still relatively simplistic and seldom incorporate a number of effects of considerable importance: sustained, dynamic and cyclic loading and environmental effects. Finally, the computational procedures currently available for modelling problems involving the ultimate capacity of concrete containments are reviewed. This includes methodologies for modelling amongst others mass concrete, cracking procedures, and bond behaviour in existing computer codes.
Bibliographic Reference: EUR 12395 EN (1989) 240 pp., FS, ECU 18.75
ISBN: ISBN 92-826-0769-0
Record Number: 199010776 / Last updated on: 1994-12-01
Original language: en
Available languages: en