Seismic response analysis of long-span bridges using nonlinear dynamic analysis techniques

Abstract

This chapter discusses the application of nonlinear analysis techniques used in the seismic upgrading of the Golden Gate Bridge, Benicia-Martinez Bridge, and the Hernando DeSoto, I-40 Bridge across the Mississippi River. Nonlinear techniques have been used for the seismic analysis of long-span bridges for both design and retrofit. Substantial savings in retrofit costs have been achieved through the use of new seismic design strategies and nonlinear analysis. The nonlinear dynamic analysis of long-span bridges can be used to predict more accurately and realistically their seismic response than elastic dynamic response and used for more cost effectively upgrading the seismic resistance of existing long-span bridges. The seismic response analysis of long-span bridges for design or retrofitting can be performed using a combination of static nonlinear analysis and dynamic nonlinear time-history analysis. Nonlinear analysis techniques are generally available to the practicing bridge engineers; however, the results obtained must be thoroughly examined and used with caution.