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Reliability assessment of concrete structures. Software package under development : Project GA 1O3/02/1030 (Czech Grand Agency) International project SARA BUT, Faculty of Civil Engineering, Brno Cervenka Consulting, Prague BOKU and TU Vienna. SARA studio. FREET. ATENA Interface.

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reliability assessment of concrete structures
Reliability assessment of concrete structures

Software package under development:

  • Project GA 1O3/02/1030(Czech Grand Agency)
  • International project SARA

BUT, Faculty of Civil Engineering, Brno

Cervenka Consulting, Prague

BOKU and TU Vienna

slide2

SARA studio

FREET

ATENA Interface

Modular concept

ATENA

n on line a r fracture mechanics fem software atena ervenka consulting
Nonlinear fracture mechanics – FEM software ATENA (Červenka Consulting)
  • SBETA material model for concrete damage: 2D failure criterion
  • Tension:
    • nonlinear fracture mechanics, exponential softening
    • smeared cracks: fictitious crack approach, crack band theory
    • two crack models: fixed and rotated cracks
  • Compression:
    • non-linear behaviour including softening (crushing)
    • compressive strength reduction after crack propagation
  • Shear:
    • shear strength reduction of cracked concrete
  • Solution methods (equations of equilibrium):
    • Newton Raphson, Arc-length.
crack band model
Crack Band Model

Independence of FEM mesh (localization limiter) (Bažant and Oh, 1983).

probabilistic module freet implementation into atena
Uncertainties modelling - random variables by PDF, described by mean value, variance and other statistical parameters.

Statistical simulation - random input parameters are generated according to their PDF using LHS.

Generated realizations of random parameters are then used as inputs for ATENA computational model. The complex nonlinear solution is performed and results (response) are saved.

Previous two steps are repeated N-times (N is the number of simulations used).

Statistical assessment - the resulting set of structural responses is statistically evaluated: Mean value, variance, coefficient of skewness, histogram, empirical cumulative probability density function of structural response, etc.

Probabilistic module - FREET implementation into ATENA
slide10

SARA studio

Practical example - PORR bridge in Vienna

slide11

PORR bridge

Longitudinal section

Ground plan

Cross section

correlation between variables using simulated annealing
Correlation between variablesusing simulated annealing

upper triangle - presribed correlation matrix

lower triangle - generated correlation matrix

(8 samples)