Seismic hazard assessment of the Queensboro bridge

ABSTRACT

In this demonstration project, a team of NCEER researches and peer reviewers has provided the technical support and expertise necessary to permit a comprehensive evaluation to be made of the seismic vulnerability of the Queensboro Bridge. The results of this study are now being used by Steinman Engineers in the vulnerability assessment of the bridge. Preliminary results from this structural phase indicate that several critical elements in the bridge may require strengthening if it is to meet the seismic perfomance criteria previously defined. These elements include the connections between the superstructure and the masonry piers. The decision to retrofit the bridge has not yet been made but the process will probably extend beyond the seismological and engineering issues described above. Such a decision will likely include the socioeconomic considerations of retrofitting as compared to the consequences of closure and/or the repair/replacement of this critical lifeline for New York City, should an earthquake occur at a future date.(AU)