| dc.description.abstract | The objective of this master's thesis is to examine one of the bridge designs suggested by the Norwegian Public Road Administration (NPRA) for the Bjørnafjorden crossing. The main goal for NPRA is to build a continuous coastal roadway from Kristiansand to Trondheim, eliminating the need for ferries.
AMC (Aas-Jakobsen, Multiconsult and Cowi) proposed bridge concept (K12) is a curving end-anchored floating bridge with 38 steel pontoons spaces around 125 meters from each other. The bridge is elevated at its southern end, allowing ships to pass. According to NPRA, if the project is finished, this bridge will be the longest of its kind.
The scope of study in this thesis is to mimic the AMC model in Orcaflex and do a time-domain analysis of the bridge when it’s subjected to seismic motion and seismic-induced tsunami. Dr. Kaiming Bi created the seismic ground motions, and the spatially correlated time histories were created using the design spectrum from Eurocode 8-2.
During the thesis, the bridge modelled in Orcaflex is utilized to do numerical assessments on the bridge, which has been subjected to seismic excitations and seismic induced tsunami. The bridge's motion and forces are gathered through simulations to see how the bridge reacts to the external motions.
The floating bridge's simulation indicates that it is viable when subjected to seismic excitations and tsunamis with low to moderate seismicity. To put it another way, seismic excitations with PGA=0.08g have little to no effect on the K12 floating bridge. | |
