Seismic Analysis of Continuous Steel Concrete Composite Bridge

Abstract

The bridge analyzed with ANSYS software which is based on the Finite Element Method. Finite Element method is one of the widely used methods nowadays to study the dynamic responses of the steel concrete bridges. Static analysis is performed to find the response of the composite bridge under the gravity load. The modal analysis was based on the Block Lanczos method is performed to get the mode shapes and natural frequencies of continuous steel concrete composite bridge. The results show that the bridge has complex modes due to the coupling effects of the free vibrations and it is more rigid in the vertical direction than in transverse and longitudinal directions. Time history analysis is performed by input of the EI Centro earthquake acceleration waves to the bridge system. The time period considered for 10 seconds with a time step of 0.0001seconds. The dynamic responses of the bridge, including the displacement, accelerations, and the stresses of the mid-span are calculated.