Reliability Assessment of Steel Frames with Semi Rigid Connections Using Enhanced Simulation Methods
Subject Areas : Analysis of Structure and Earthquake
javad Jamshidi
1
,
mohsen izadinia
2
,
mohhamad ali rahgozar
3
1 -
2 - department of civil engineering- najafabad branch - islamic azad university - najafabad - Iran
3 - Najafabad Branch, Islamic Azad University, Najafabad, Iran
Keywords: Semi rigid connections, failure probability, reliability, simulation.,
Abstract :
Neglecting uncertainties in structural design can lead to inaccurate estimation of failure probability and structural reliability. Since the exact behavior of semi rigid connections (neither fully rigid nor fully pinned) is not well defined, their design should be based on actual performance characteristics. This study aims to investigate the behavior of steel frames with semi rigid connections and to compare them with better performing connections in terms of ductility and other parameters, under seismic loading conditions and in the presence of uncertainties, by implementing a novel reliability analysis method. The proposed method estimates the reliability index, design with maximum failure probability, and the failure probability (Pf) of uncertain systems with higher accuracy and reduced computational effort compared to response surface methods, first order reliability methods, and Monte Carlo simulation. The results indicate that the enhanced simulation method provides more accurate reliability evaluation for steel frames with semi rigid connections than the response surface method, owing to the inclusion of uncertainty parameters in the analysis. Steel frames exhibit high sensitivity to variations in random variables such as the yield stress of steel, with reliability decreasing nonlinearly as this parameter increases. Furthermore, the semi rigid nature of the connections significantly influences the overall structural reliability.
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