Browsing by Author "Bouzelha, Karima"

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    Structural reliability of elevated water reservoirs under wind loading
    (2019-07-01) Hammoum, Hocine; Bouzelha, Karima; Sellamb, Youcef; Haddadb, Lounes
    In the field of civil engineering, concrete water storage tanks are considered as hydraulic structures occupying a special place among other structures. The location of these tanks is based on hydraulic considerations related to the desired service pressure for subscribers whose solution is obtained by a compromise with the topographical constraints. In southern Algeria and the highlands; in order to ensure adequate pressure in the drinking water supply networks, the tanks are then elevated to high heights, which puts them under significant stress during windstorms and sandstorms conditions that are frequent in the South Algerian. As the severe weather conditions due to high winds are common, the elevated water storage tanks are designed to withstand to winds speeds included between 25 and 31 m/s according to the Algerian Wind Code. Given the uncertain and randomness of this phenomenon, the classical deterministic calculations of the engineer become limited since they do not integrate the notion of failure probability of the structure. In this study, a probabilistic approach based on Monte Carlo simulations is used to analyze the reliability of elevated water tanks submitted to hazard storm of wind loading. The limit state functions are related to the ultimate and serviceability limit states of the concrete elevated tank under wind analysis. This reliability approach, takes into account mainly two parameters which are the wind speed and the concrete compressive strength considered as random variable. Fragility curves depending on wind zones are obtained, where they demonstrate the dominant failure modes that can cause the structural failure.
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    Temporal analysis of the performance of a RC storage tank considering the corrosion
    (2019-07-01) Bouzelha, Karima; Amazouz, Lynda; Miloudi, Nassima; Hammoum, Hocine
    The reinforced concrete (RC) water storage tanks are hydraulic structures that occupy a special place among civil engineering structures. Under the effect of hydrostatic and hydrodynamic loads, their walls undergo horizontal tensile stresses which are absorbed by horizontal reinforcements. Moreover, these structures are subjected to high aggressive atmospheric conditions that expose their walls to a risk of harmful corrosion. This dangerous phenomenon leads to the reduction of their steel reinforcement sections and consequently to the loss of their resistance and function. In this paper, we are interested in the performance analysis of RC storage tanks, taking into account the phenomenon of corrosion of strained reinforcements, considering the environments of different aggressiveness rates. Westergaard method is applied to evaluate the hydrodynamic pressure on the wall. A corrosion model is performed in order to determine the evolution in time of the reinforcement section for different environments considered. Several parameters influencing the corrosion are considered, such as the concrete cover of steel reinforcement and the concentration of chlorides ions.