Author(s): Carlos Martínez, Isabel Rojas and José Rodríguez

Abstract: This research investigates the dynamic performance of steel-concrete composite beams (SCBs) under varying dynamic loading conditions through both experimental testing and finite element (FE) modeling. The study focuses on the influence of interface slip stiffness, shear connection details, and damping on the natural frequencies, dynamic amplification factors (DAF), and damping ratios of composite beams. Experimental results demonstrated significant discrepancies between measured natural frequencies and pre-update FE predictions, primarily due to the neglect of interface slip effects in the initial models. Post-update FE models, incorporating interface slip and damping factors, yielded predictions that closely matched experimental data, with frequency errors reduced to minimal values (within 0.17 Hz). Dynamic amplification was found to be strongly correlated with damping ratios, with higher damping leading to lower peak amplification. Furthermore, a regression analysis revealed a strong inverse relationship between slip stiffness and frequency shift, emphasizing the importance of accurately modeling shear connections in dynamic simulations. The results highlight the importance of model updating and provide practical recommendations for improving the dynamic analysis of composite beams, especially in infrastructure subjected to dynamic loading. This study underscores the need for detailed modeling of interface interactions and damping mechanisms to ensure accurate dynamic response predictions and enhance the safety and reliability of composite structures under real-world loading conditions.

Pages: 20-25 | Views: 6 | Downloads: 5

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