International Conference on Advances in Engineering, Architecture, Science and Technology (ICA-EAST 2021), Erzurum, Turkey, 15 - 17 December 2021, pp.1-9
A three-span box girder highway bridge seismically isolated with lead rubber bearings is investigated for changing properties of bearings. These properties are characteristic strength and post-elastic stiffness which determine the behavior of an elastomer bearing. The bridge is analyzed using horizontal and vertical design response spectra. The fundamental period of the bridge, maximum displacement of the superstructure and maximum internal forces of pier columns are compared for different characteristic values. A hand-made program is developed through the MATLAB programming language by utilizing the Application Programming Interface (API) feature of the CSiBridge commercial bridge program in order to be able to conduct a large number of structural analyses parametrically. All the required analyzes are performed automatically and quickly with the help of this program.
As a result of the conducted structural analyses it is seen that an increase in the characteristic strength and post-elastic stiffness reduces the horizontal displacements of the bridge superstructure while increases the internal forces generated at the bases of the bridge pier columns. Therefore, the importance of careful selection of the bearing characteristic strength and post-elastic stiffness values in the lead rubber bearing design is realized for decreasing the bridge responses by keeping the displacements at a reasonable value.