Abstract
In order to consider the effect of near-field vertical earthquake, a model of a two-span continuous beam bridge is established. On the basis of superposition of longitudinal and vertical seismic actions, the possible separation of vertical earthquake is considered, and the influence of separation on structural failure is calculated. The transient wave characteristic function method and the indirect mode superposition method are used to solve the response theory of the bridge structure during the earthquake. When the vertical seismic excitation period is close to the vertical natural vibration period of the bridge, structure may separate. For the high-pier-type bridge, the separation enlarges the deformation of the pier and even causes the pier failure. The external conditions such as the time difference of arrival of seismic wave and the stiffness of support will affect the deformation of bridge piers. In addition, the number of separations will also change the seismic response of the pier.
Highlights
As a transportation hub, bridges will cause serious damage to the road network when an earthquake occurs, which brings great difficulties to rescue work in the disaster-stricken areas
There are few studies on the vertical impact force between the main beam and the pier under vertical seismic action, especially the eccentric collision phenomenon caused by the impact force on the pier
In the process of vertical impact process, the dynamic deformation after contact collision can be divided into the impact force deformation XF and the dynamic wave deformation Xz. e indirect mode superposition method [26] was used to calculate the structural displacement under the impact force
Summary
Bridges will cause serious damage to the road network when an earthquake occurs, which brings great difficulties to rescue work in the disaster-stricken areas. Yang et al [25] used continuum model to calculate the vertical impact force between main girder and pier This method cannot clearly explain the collision process, especially for the bearing stiffness changes, the calculation results may have large dispersion. In the process of vertical impact process, the dynamic deformation after contact collision can be divided into the impact force deformation XF and the dynamic wave deformation Xz. e indirect mode superposition method [26] was used to calculate the structural displacement under the impact force. By introducing equation (20) in equation (23), the vertical load Fp and the collision contact part of bridge structure displacement YF, UF can be calculated by using the step-by-step integration method.
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