u2.06.11 Analysis of the seismic behavior of large metal reservoirs

Summary:

The objective of this document is to describe the various steps to be implemented in Code_Aster to perform the numerical simulation of the earthquake resistance of large metal reservoirs. These thin metal structures can then present two preferred methods of failure: breakage of the anchors or buckling of the shells.

The first approach is based on a push-over regulatory method. In addition, it is possible to use a nonlinear stability criterion (cf. documentation [U2.08.04] and test cases SSLL105 and SSNL126).

The second approach is direct transient modeling with full consideration of the fluid domain through a coupled fluid-structure approach in large displacements (modeling similar to that of test case FDNV100). This transitory analysis can also be combined with a non-linear stability analysis, as test case FDNV100 also shows.

• 1. Introduction
• 2. Presentation of the problem
  • 2.1. Structure geometry
  • 2.2. Materials used
• 3. Quasi-static push-over approach
  • 3.1. Imposed loads
  • 3.2. Quasi-static monotonic nonlinear resolution method
  • 3.3. Notes on calculations and post-treatments
  • 3.4. Fine modeling of anchorages: lifting
  • 3.5. Use of the nonlinear stability criterion
  • 3.6. Load control
• 4. Coupled transitional approach
  • 4.1. Reference problem
  • 4.2. Coupled fluid-structure modeling in Code_Aster
  • 4.3. Boundary conditions
  • 4.4. Initial conditions
  • 4.5. Transitional resolution
  • 4.6. Use of the nonlinear stability criterion
• 5. Bibliography