Seismic performance of joints of prefabricated corrugated steel utility tunnels Part(II) – Numerical analysis

Abstract

Based on the comprehensive test results of an actual project, the simulated static test of the utility tunnel was carried out. The numerical models were developed based on the finite element code ABAQUS. The material and mechanical parameters adopted in the model were calibrated through laboratory testing. Also, the numerical model was validated by comparing the computational results against the experimental outputs from Part I [1]. Employing the validated model, a series of parametric analyses was carried out to assess the impact of various parameters on the seismic performance of the structure. From the results analysis, it was revealed that the presence of the flanges at the connection joints hurts the seismic performance of the structure, and the hysteresis curve of the model without flange was fuller. However, these flanges serve as stiffening ribs, effectively enhancing the load-bearing capacity and stiffness of the structure. The thickness of the corridor and the corrugated steel plate waveform were identified as crucial factors influencing the hysteresis performance of the tunnel. Conversely, the influence of flange thickness was identified to be not significant. It was recommended to position the bolts as close as possible to the connection between the flange and the corrugate plate to minimize disconnection occurrences, subject to meeting installation requirements. Furthermore, welding the four pieces together can enhance the seismic performance of the tunnel. The findings in this paper provide a reliable theoretical and experimental basis for the seismic research design calculation and engineering application of the prefabricated corrugated plate integrated utility tunnel.