Study On Seismic Applicability Of The Design Parameters Of Curved Continuous Rigid Frame Bridges With Long-span And High-pier

In recent years, With the rapid development of transportation, curved continuous rigid frame bridges with long-span and high-pier have been greatly extended and applied in bridge engineering for its many merits, such as reasonable structure, long-span capability, beautiful lines and mature construction means. These bridges are lifeline engineering, once destroyed under earthquake, it will bring greater economic losses. It is important to make an analysis to the seismic response of curved continuous rigid frame bridges with long-span and high-pier.This paper, in the engineering background of a curved continuous rigid frame bridge with long-span and high-pier in the west, establishes 36 calculation models of three-spans symmetric curved continuous rigid frame bridges, which are composed of sing-double thin wall pier, section type of double thin-wall pier, the spacing of the double thin-wall pier, the tie beam's rigidity and quantity. Based on spatial rigid frames finite element method, ANSYS is employed to build up models taking into Single factor, then the structure's Dynamic characteristics is analysed, and the linear seismic response is derived under the excitation of the severest ground motion waves under I～III site, the three severest ground motion waves are selected in each type of site. By this way, we can study the seismic response influence of curved continuous rigid frame bridges with long-span and high-pier due to the substructure design parameters under no soil-structure interaction conditions; how to select the substructure design parameters can make the structure acquire the most greatly seismic capacity ability under every site; when the structures selecting the same substructure design parameter under different sites, the key parts' seismic response.The results shows that: No matter what kind of the structure's site, the double thin wall pier has a better seismic applicability than the single thin wall pier; If the hollow pier and the solid pier have approximate section area, the formers seismic applicability is better than the latter; If the tie beam's rigidity is large than EI or its quantity is more than one, the structural seismic ability is lower. Regarding the spacing of the double thin-wall pier which varies between the 1/20 and 1/25 of the span, if the structure is under I site, 1/22.5 and 1/25 of the span have better seismic applicability, if the structure is under II site, seismic applicability is not sensitive, if the structure is under III site, 1/20 of the span have better seismic applicability.On the basis of a great amount of numerical analyses, some useful conclusions about the seismic applicability of the substructure design parameters under every site are drawn correspondingly, which can give reference to the earthquake resistant design of the same bridge type, it can also provide technical basis for conceptual design into reality in preliminary design stage.