Seismic Analysis of Frame Bridges in Distrito Federal, Mexico

There is a lack of explicit regulations for the seismic design of integral bridges in Mexico. However, many bridges built in the urban environment are located in high seismicity areas. In Mexico City, two span reinforced concrete frame bridges are very common. Many of them are over 40 years old and some of them are tilted because of the flexible soil conditions. This study aimed at determining the seismic behavior of frame bridges located in Mexico City. In order to assess the time domain response of the bridges, numerical models were subjected to typical ground motion records of the September 19, 1985, Mexico earthquake. The bridge responses are evaluated by the analysis of shear forces and overturning moment demands.