A co-simulation method for the train-track-bridge interaction analysis under earthquake using Simpack and OpenSees

Abstract

Under high-level earthquakes, bridge piers and bearings are prone to be damaged and the elastoplastic state of bridge structural components is easily accessible in the train-track-bridge interaction (TTBI) system. Considering the complexity and structural non-linearity of the TTBI system under earthquakes, a single software is not adequate for the coupling analysis. Therefore, in this paper, an interactive method for the TTBI system is proposed by combining the multi-body dynamics software Simpack and the seismic simulation software OpenSees based on the Client-Server architecture, which takes full advantages of the powerful wheel-track contact analysis capabilities of Simpack and the sophisticated nonlinear analysis capabilities of OpenSees. Based on the proposed Simpack and OpenSees co-simulating train-track-bridge (SOTTB) method, a single-span bridge analysis under the earthquake was conducted and the accuracy of co-simulation method was verified by comparing it with results of the finite element model. Finally, the TTBI model is built utilizing the SOTTB method to further discuss the running safety of HST on multi-span simply supported bridges under earthquakes. The results show that the SOTTB method has the advantages of usability, high versatility and accuracy which can be further used to study the running safety of HST under earthquakes with high intensities.

Keywords

train-track-bridge system / co-simulation / SOTTB / client-server / running safety

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