Reliability Assessment of Steel‐Concrete Composite Beams considering Metal Corrosion Effects

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.

Đánh giá độ tin cậy của cột thép tiết diện thay đổi sử dụng kết hợp thuật toán nơ-ron nhân tạo (ANN) và mô phỏng Monte Carlo (MCS)

“…Trong các phương pháp kể trên thì MCS là một phương pháp số để xác định xác suất sự cố bằng cách mô phỏng lại các biến đầu vào và đánh giá xác suất dựa trên số lần xảy ra sự cố trong nhiều lần mô phỏng. Đã có nhiều nghiên cứu áp dụng phương pháp này để đánh giá xác suất độ tin cậy của kết cấu [2][3][4][5]. Tuy nhiên, việc tính toán các mẫu ngẫu nhiên có thể tốn nhiều thời gian và tài nguyên tính toán, đặc biệt khi có nhiều biến đầu vào hoặc mô hình kết cấu phức tạp [6].…”

Simulation-Based Reliability Analysis of Steel Girder Railway Bridges

“…However, according to new statistical data, re-calibration of the load and resistant factor is required (Leblouba et al, 2020). The computer technology investigations and scientific studies about the reliability index allow implementing a full-probabilistic approach in new bridge design and performance evaluation of the existing bridges (Kuroda & Nishio, 2020;Nguyen, 2020;Sommer et al, 1993;Tabsh & Nowak, 1992). UIC (2006) allowable stress design approach is used in Turkey to perform reliability analysis of the existing steel railway bridges (UIC-71, 2006).…”

Probabilistic Approach to Limit States of a Steel Dome

“…The first order reliability method (FORM) [ 5 , 6 , 7 ] and the second order reliability method (SORM) [ 8 , 9 , 10 , 11 ] are approximated approaches. Importance sampling [ 12 , 13 , 14 ], artificial intelligence [ 15 , 16 ], and the Monte Carlo method [ 17 , 18 , 19 ] are simulation approaches. A probabilistic approach makes it possible to provide a description that is more accurate and closer to the actual reality with respect to structure materials, geometric parameters, and loads.…”