Abstract
Self-anchored suspension bridge is widely used in Chinese City bridge engineering for the past few years. Because the anchorage system of main cable has been changed from anchorage blocks to the ends of the girder, its’ dynamic mechanics behavior is greatly distinguished with the traditional earth anchored suspension bridge. This paper studies the dynamic characteristics and seismic response of one large-span self-anchored suspension bridge which is located in China/Shenyang city. Using a spatial dynamic analysis finite element mode, the dynamic characteristics are calculated out. An artificial seismic wave is adopted as the ground motion input which is fitted with acceleration response spectrum according to the Chinese bridge anti-seismic design code. Time-integration method is used to get the seismic time-history response. Geometry nonlinear effect is considered during the time-history analysis. At last, the dynamic characteristics and the behavior of earthquake response of this type bridge structure are discussed clearly. The research results can be used as the reference of seismic response analysis and anti-seismic design for the same type of bridge.
Highlights
Self-anchored suspension bridge is widely used in Chinese City bridge engineering in recent years
In the following ten years, there are at least thirty self-anchored suspension bridges which are finished in China
This mechanical character of the girder will bring the P-delta nonlinear effects which can reduce the bending stiffness of the bridge contrast to traditional earth anchored suspension bridge, which will enlarge the natural period of vibration of the self-anchored suspension
Summary
Self-anchored suspension bridge is widely used in Chinese City bridge engineering in recent years. Considering the characteristic of this type bridge, the girder is subjected to bending moment as well as axial force which is the huge horizontal component of the cable force. This mechanical character of the girder will bring the P-delta nonlinear effects which can reduce the bending stiffness of the bridge contrast to traditional earth anchored suspension bridge, which will enlarge the natural period of vibration of the self-anchored suspension. In this paper, taking one large-span self-anchored suspension bridge engineering as a case, the author study the dynamic characteristics and seismic response of this type bridge structure. The dynamic characteristics and the behavior of earthquake response of this type bridge structure are discussed clearly
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