The response of concrete-filled steel tube (CFST) arch bridges tomulti-componentseismic
excitation and its calculation were investigated using the theory of random vibration. A pseudo-
excitation method for multi-component seismic excitation was proposed, the stationary stochastic
response ofCFST arch bridges tomulti-component seismic excitation was analyzed with thismethod,
and the effectof traverse brace stiffness on the stochastic responsewasdiscussed. The resultshows that
thismethod has the same accuracy as the classic stochastic vibration method and an advantage in
calculation velocity. Transverse and vertical seismic excitationshave a large effecton the internal force
of arch rib, and the internal force increaseswith the increasing of traverse brace stiffness.