EARTHQUAKE-INDUCED COLLAPSE SIMULATION OF A SUPER LONG SPAN CABLE-STAYED BRIDGE BASED ON AN OPEN SOURCE FE PROGRAM

Currently, most elasto-plastic analyses of long span bridges are conducted using commercial finite element software, which, to some extent, limits the in-depth investigation on associated topics. Based on the open source FE software package (i.e., OpenSees), a numerical model, integrating multi-layer shell elements for decks/piers and truss elements for prestressed cables, is herein proposed to simulate the behavior of a super long span cable-stayed bridge with a maximum span of 1500m (i.e., Qiongzhou Strait Bridge). The seismic performance of this Bridge is evaluated and compared with the results of commercial program MSC.Marc to validate the feasibility and accuracy of the elements and the finite element model. Furthermore, the collapse simulation of the bridge is successfully performed and the corresponding collapse mechanism is revealed. The research's outcome could provide a reference for further studies on seismic performance of super long span cable-stayed bridges based on open source FE programs.