Abstract
Steel-concrete composite (SCC) beams have been widely used in civil engineering and industrial structures. This kind of structure has some advantages such as fast fabrication time and optimized weight. However, designers are often concerned about the initial reliability, while over time the structural reliability will be reduced, especially due to metal corrosion. The objective of the paper is to assess the structural reliability of corroded SCC beams, in which the input parameters are considered as random variables. The SCC beam has been designed according to Eurocode-4 (EC-4), in which input parameters consist of cross-sectional dimensions of the beam, material properties, and applied loads. The effects of the random input variables on the reliability of structures are evaluated by sensitivity analyses, which are calculated by the global sensitivity analysis using Sobol’s method and Monte Carlo simulation. The developed reliability analysis algorithm in this study is verified with previous studies, highlighting the capability of the used method. Four different corrosion levels, which are pristine, 10-year, 20-year, and 50-year, are considered in the sensitivity analyses of the SCC beam. Finally, a series of first-order and total-order Sobol’s indices are obtained for measuring the sensitivity of input parameters with four corrosion levels.
Highlights
Kiureghian et al [11] assessed the reliability of the steel frame under the dynamic loads generated from the 1940 El Centro earthquake using β distribution method. is approach was used in Hong et al [12] to study the reliability of steel frames according to the plastic limit state
Zhao et al [16] performed the fatigue-reliability evaluation of steel bridges according to the American association of state highway and transportation officials (AASHTO) guidelines
Mamuda et al [18] implemented the reliability assessment of Steel-concrete composite (SCC) beams according to EC-4 using first-order reliability method (FORM)
Summary
Where Fa (Aafy/ca) is the plastic strength of the steel section and Fc hc.beff (0.85fck/cc) is the strength of the concrete slab. The deflection of the composite beam depends on the way of fractioning. In the case of fractioning without intermediate supports, applied loads can be imposed on the steel section without the composite effect or the loads directly subject on the composite section: w. Where w is the overall deflection and wlim is the limit value of deflection according to EC-4. 4. Reliability Analysis of SCC Beams e reliability of SCC beams is assessed based on the combination of the deterministic and uncertainty models, in which the randomness of input parameters is considered
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