Engineering, 2013, 5, 997-1005 Published Online December 2013 (http://www.scirp.org/journal/eng) http://dx.doi.org/10.4236/eng.2013.512121 Analysis of the Cause for the Collapse of a Temporary Bridge Using Numerical Simulation Changsung Kim, Jongtae Kim, Joongu Kang Water Resource Research Department, Korea Institute of Construction Technology, Goyang, Korea Email:
[email protected] Received October 1, 2013; revised November 1, 2013; accepted November 8, 2013 Copyright © 2013 Changsung Kim et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ABSTRACT The purpose of this study was to suggest the measures and methods for securing the stability of temporary bridges by analyzing the cause for the collapse of the temporary bridge built for the construction of the GunNam flood control res- ervoir located at the main channel of the Im-Jin River. Numerical simulations (one-, two-, and three-dimensional) were performed by collecting field data, and the results showed that the collapse occurred because the height of the tempo- rary bridge was lower than the water level at the time of the collapse. Also, the drag force calculation showed that when the guardrail installed on the upper deck structure was not considered, there was no problem as the calculated values were lower than the design load, whereas when the guardrail was considered, the stability was not secured as the calcu- lated values were higher than the design load, 37.73 kN/m.