Structural Reliability Assessment of Steel Four-Bolt Unstiffened Extended End-Plate Connections Using Monte Carlo Simula
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RESEARCH PAPER
Structural Reliability Assessment of Steel Four‑Bolt Unstiffened Extended End‑Plate Connections Using Monte Carlo Simulation and Artificial Neural Networks Hamidreza Abbasianjahromi1 · Somayeh Shojaeikhah1 Received: 24 August 2019 / Accepted: 1 October 2020 © Shiraz University 2020
Abstract Connections account for a pivotal function in the safety of a structure. The structural design should be based on minimal probability of failure in its lifetime, which is addressed by the probabilistic methods for the evaluation of structural reliability. However, conventional reliability techniques, including Monte Carlo simulation (MCS), require plenty of time for cases with implicit limit state function (LSF). Accordingly, the present study aims to analyze the structural reliability of the steel four-bolt unstiffened extended end-plate connections using integrated artificial neural network (ANN) and MCS approaches. The ANN-based MCS exhibits a higher speed compared to the conventional application as the implicit LSF is estimated by the ANN model. The finite element modeling of the connections provides the data required for ANN training. Following the achievement of the LSF, the MCS method is used to assess the connection reliability. Considering a target reliability index of 3.5, a resistance reduction factor was obtained to be 0.82 which is smaller than the current system resistance factor used in AISC 358 connections. Keywords Structural reliability · Four-bolt unstiffened extended end-plate connection · Monte Carlo simulation · Artificial neural networks
1 Introduction The safety of steel structures, even those with conservative beams and columns, against vertical and lateral forces can be achieved only in the presence of an appropriate design and an efficient implementation of all details, especially the used connections. Hence, it is essential to understand the behavior of connections and to design their structure correctly. In this regard, one of the widely used types of connections in the steel structures is the bolted end-plate moment connections (Owens and Cheal 1989; Trahair 2007). The bolted end-plate steel connections owing to ease of fabrication and erection have attracted further attention in recent years (Dessouki et al. 2013). Among the various applications of this method, * Hamidreza Abbasianjahromi [email protected] Somayeh Shojaeikhah [email protected] 1
Department of Civil Engineering, K.N. Toosi University of Technology, Valiasr ST, Tehran, Iran
its main usage is to connect a beam to a column or to splice two beams. Figure 1 shows this type of connection with their first applications, which have an end-plate welded to the end of the beam and bolts screwed to the connected column. Nevertheless, there are no determined quantities for the pivotal design parameters, including resistance and load, which have inherent uncertainties (Nowak and Collins 2012). These parameters are also called random variables, indicating the impossibility of ignoring these uncertainties in a desi
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