• Journal of the Computational Structural Engineering Institute of Korea
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• v.35 no.2
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• pp.131-140
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• 2022

Installing Continuous Welded Rail (CWR) is one of the economical ways to resolve the challenges of noise, vibration, and the open-deck steel railway bridge impact, and the SSF method using the interlocking sleeper fastener has recently been developed. In this study, the method employed for determining the optimum vertical stiffness of the sleeper pad installed under the bridge sleeper, which is utilized to adjust the rail height and absorb shock when the train passes when the interlocking sleeper fastener is applied, is presented. To determine the optimal vertical stiffness of the sleeper pad, related existing design codes are reviewed, and, running safety, ride comfort, track safety, and bridge vibration according to the change in the vertical stiffness of the sleeper pad are estimated via flexible multi-body dynamic analysis,. The flexible multi-body dynamic analysis is performed using commercial programs ABAQUS and VI-Rail. The numerical analysis is conducted using the bridge model for a 30m-long plate girder bridge, and the response is calculated when passing ITX Saemaeul and KTX vehicles and freight wagon when the vertical stiffness of the sleeper pad is altered from 7.5 kN/mm to 240 kN/mm. The optimum stiffness of the sleeper pad is calculated as 200 kN/mm under the conditions of the track components applied to the numerical analysis.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.24 no.5
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• pp.513-520
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• 2011

In this paper, the advanced explicit algorithm is proposed to simulate the stress-erection process analysis of Strarch system. The Strarch(Stressed-Arch) system is a unique and innovative structural system and member prestress comprising prefabricated plane truss frames which are erected by a post-tensioning stress-erection procedure. The flexible bottom chord which have sleeve and gap detail are closed by the reaction force of prestressing tendon. The prestress imposing to the tendon will make the Strarch system to be erected. This post tensioning process is called as "stress-erection process". During the stress-erection process, the plastic rigid body rotation is occurred to the flexible top chord by the excessive amount of plastic strain, and the structural characteristic becomes to be unstable. In this study, the large deformational beam-column element with plastic hinge is used to model the flexible top chord, and the advanced Dynamic Relaxation method(DRM) are applied to the unstable problem of stress-erection process of Strarch system. Finally, the verification of proposed explicit algorithm is evaluated by analysing the stress-erection of real project of Strarch system.