Investigation Of The Fracture Mechanic Of Concrete Gravity Dams Using Probabilistic Analysis

Farhang, Setareh (2017) Investigation Of The Fracture Mechanic Of Concrete Gravity Dams Using Probabilistic Analysis. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

There are some cracks in structures that they can make a flaw or reduce their usfull life. Most of the dams experience an intensity earthquake in their life without fail in them but they are cracked due to intolerance of tensile stress by concrete. In this thesi, the investigation of the fracture mechanic in concrete gravity dams by using probabilistic analysis and Monte Carlo simulation is done for safety and optimum design using ANSYS software. For this purpose, Koyna concrete gravity dam was chosen as case study by applying El Centro, San-Fernando, Northridge and Koyna scale earthquakes. In 1967 the mentioned dam experienced an earthquake of magnitud 6/5 on Richter and was cracked widely. Computational procedure for two–dimensional finite element analysis of the base–case model is carried out in time domain considering the dynamic excitation and dam–reservoir–foundation interaction. Sommerfeld boundary condition is used for the reservoir and Newmark method which is unconditionally stable, is seleted for the numerical integration in computations of dynamic analysis. The analyses are used to investigate the propagation of crack and discrete crack. For evaluation of the effect of different parameters, the output results containing the maximum hydrodynamic pressure, dam crest displacement, tensile stress in heel and compressive stress in the toe of dam, as critical response, are investigated and the obtained results are evaluated by means of curves.

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