6 research outputs found

    FLEXURAL TESTING OF VARIOUS COMPOSITE-BEAMSUNDER QUASI-STATIC LOADS

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    The successful interaction between concrete and steel has inspired researchers to develop composite structural systems. Steel and concrete are utilized in various configurations to reduce construction costs and assure optimal load-response behavior. Since the response spectrum of the composite system varies from one system to another, adequate understanding of the composite system behavior is essential to guarantee a desired response. Several parameters affect the flexural capacity and failure mode of a composite section, such as geometry, material properties and bond. In practice, advanced material mechanics and numerical modeling can be utilized for simulating section response, however, variability in the material response hinders accurate prediction. To serve as a benchmark and facilitate optimal composite section design, this paper presents a thorough experimental investigation of four types of composite beams under flexural loading. The first type represents reinforced concrete T-shaped beams confined by structural steel members. The second system comprises steel tubes filled with concrete. The third type consists of an open web steel joist encased in reinforced concrete. The fourth system represents rectangular shaped RC beams strengthened by steel plates. The results confirm the diversity of behavior of composite sections and reveal significant enhancement in the failure mode and flexural behavior as compared to control non-composite sections

    A NOVEL PROBABILISTIC FRAMEWORK OF RC CORRODED STRUCTURES UNDER DYNAMIC LOADING

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    Steel corrosion in reinforced concrete structures can lead to severe deterioration damage under static and seismic loads. In practice, it is essential to mitigate failure risk by quantifying the extent of damage and simulating the structural response of damaged structures. However, numerical modeling of the dynamic behavior of corroded structure is challenging due to high nonlinearity of the problem and its multidisciplinary nature. In addition, corrosion damage exhibits various sources of uncertainty that impede accurate deterministic modeling of the dynamic response of RC structures. Therefore, this study presents a simplified framework, to simulate the non-linear response of corroded structures under seismic excitation, in a statistical setting. The presented scheme employs set of state-of-art experiments and numerical investigations of corrosion effect and response to capture the generic non-linear response. The presented scheme is utilized to conduct reliability analysis for corroded structures under earthquake loads by incorporating different sources of uncertainties associated with the used mathematical models and model parameters. The power of the suggested probabilistic scheme is illustrated on two simulated structures, where two different statistical properties are considered; the initial statistical parameters and a real-time monitored statistic for the rate of corrosion

    A Comparative Study between the Analytical and Experimental Deflection Response of Corroded Simply Supported Reinforced Concrete Beams

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    This paper involves a comparative experimental and analytical investigation on the deflection behavior of corroded reinforced concrete simply supported beams. For this aim, two beams specimens of different dimensions are subjected to a lab-controlled environment to stimulate the effect of corrosion on their deflection values and two other beams of the same dimensions are kept intact as control beams. The impressed current technique is used for accelerating corrosion in beams for different periods of exposure. This has led to a different amount of corrosion in each beam. The load deflection variation of all the corroded and control beams is represented next when all beams are tested for bending until failure. On a parallel hand, an analytical attempt is run to determine the load deflection behavior using a simple mathematical modeling. The analytical approach involves the use of the modified deflection equations taking into account the amount of corrosion induced, the degradation in bond strength, and the resulting slippage effect in the beam. In both approaches, the corrosion phenomenon is shown to clearly affect the deflection behavior of the reinforced concrete beam. It is also noticed that a good agreement is achieved when identifying the analytical deflection value in simply supported reinforced concrete corroded beams in compare to the experimental acquired ones with some restrictions
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