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Abstract To study the effect of high-order modes on the seismic response of long-span steel truss arch bridges，a deck-type steel truss arch bridge with a span of 490 m was taken as the research object．By virtue of the software MIDAS Civil to build the finite element model of the whole bridge，based on the fundamental principle of mode analysis spectrum method，the separation method for the seismic response of the bridge with high-order modes was introduced by combinedly using the dynamic analysis and static analysis．On this basis，the influence of main control orders on the longitudinal seismic response of the main arch ring of the bridge was analyzed，and the seismic response mechanism was revealed．The results show that the influence of the same vibration mode on different internal force components at the same position of the chord bar under the main truss is different．The same vibration mode has different influence on the same internal force component in different areas of the chord under the main truss．Viewing the overall internal force distribution on the lower chord of the main truss，the influence of different modes on the axial force and bending moment on the lower chord is similar，but the influence on the shear force is obviously different．For the axial force and bending moment，in the region from L/8 to arch foot，the high-order vibration mode has a significant impact．For shear force,in the region from middle-span to L/4，the influence of high-order modes is significant，and the effect of multi-mode coaction is obvious．
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Received: 03 November 2018
Published: 15 March 2020
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