Abstract
The seismic responses of a long-span cable-stayed bridge under uniform excitation and traveling wave excitation in the longitudinal direction are, respectively, computed. The numerical results show that the bridge’s peak seismic responses vary significantly as the apparent wave velocity decreases. Therefore, the traveling wave effect must be considered in the seismic design of long-span bridges. The bridge’s peak seismic responses do not vary monotonously with the apparent wave velocity due to the traveling wave resonance. A new traveling wave excitation method that can simplify the multisupport excitation process into a two-support excitation process is developed.
Highlights
Because of the ever-increasing economic and technological developments, long-span cable-stayed bridges have increased in both number and span lengths, examples include the Tatara Bridge, built in Japan in 1999 with a main span of 890 m, the Sutong Bridge, built in China in 2008 with a main span of 1088 m, and the Russky Island Bridge, built in Russia in 2012 with a main span of 1104 m
The results show that responses considering the traveling wave effect significantly differ from those under uniform excitation
Let us compare the results in the case where c = 1000 m/s with those in the case of uniform excitation: under the excitation of a1, FP3 increases by 19.1%, MT1 decreases by 11.3%, and FT1 increases by 40%
Summary
Because of the ever-increasing economic and technological developments, long-span cable-stayed bridges have increased in both number and span lengths, examples include the Tatara Bridge, built in Japan in 1999 with a main span of 890 m, the Sutong Bridge, built in China in 2008 with a main span of 1088 m, and the Russky Island Bridge, built in Russia in 2012 with a main span of 1104 m. The methods for obtaining seismic sources play very important roles for investigating safety performance of cablestayed bridges as well, and Dong and Li have conducted primitive work in this area [19,20,21,22,23] They optimized and simplified the sensor location coordinates to find the analytical solution of the acoustic emission/microseismic source location coordinates. This paper, by comparing between the seismic responses of a highway bridge under both traveling wave and uniform excitations, demonstrates the seismic response characteristics of long-span cable-stayed bridges under traveling wave excitation and develops a new traveling wave excitation method that can simplify the multisupport excitation process into a two-support excitation process.
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