The Influence Analysis Of The Design Parameters Of Large-span High Piers Bend Continuous Rigid-framed In The Natural Oscillation And Earthquake Response

China lies in the earthquake zone, where many strong earthquakes in history have happened. During the last decade, some serious earthquakes happened. Most of mountainous regions of our country locate in the active earthquake zone, and the strategy for the development of the western regions prompted many high standard lines to construct, and many high piers of long-span curve continuous rigid frame bridges were built. How to guarantee high piers of large-span bridge design safety and economic rationality, withstand suddenly serious earthquakes have been a new study field where questions are constantly arising.When the span is more than 150 meters, there are no standards to follow in the existing highway engineering anti-seismic norms. Although the railway engineering anti-earthquake design specification has no span restrictions, a special seismic requirements for buildings and the new type structure will be studied specially. Therefore, although there are a lot of dynamic response of research literatures about the high pier of long-span bridges, instructing the research results of the design and construction are still rare.The paper uses the orthogonal experiment design test condition and protocols rigid-framed main design parameters, such as curve radius. pier height of double thin-wall piers. space between double piers.tie beam number.tie beam rigidity. Applying the orthogonal experiment design, twenty-four models were set up.With the linear elastic theory, the paper analyzed the influence of the design parameters of large-span high piers bend continuous rigid-framed in the behavior of natural oscillation and the earthquake response. The main contents of the study including:(1)Taking the Shayingou Brige as the subject, twenty-four large-span high piers bend continuous rigid-framed models with different design parameters and same span were set up. The main design parameters are curve radius. pier height of double thin-wall piers. space between double piers.tie beam number.tie beam rigidity.(2) The mixed orthogonal table L24(41×31×24) was carried out, the orthogonal experiment design were test. It analyzed the dynamic sensitivity of the large-span high piers bend continuous rigid-framed in the design parameters and the design parameters level.(3) Based on ANSYS, the multi-factors analysis model is established. It analyzed the influence of vibration characteristics by orthogonal design conditions of large-span high piers bend continuous rigid-framed design parameters. It analyzed the influence of the self-vibration characteristics of the design parameters. And it summarized the self-vibration characteristics rules of the design parameters.(4) Based on ANSYS, the multi-factors analysis model is established.. The man-made wave was used. The twenty-four large-span high piers bend continuous rigid-framed models were driven from the straight line and the cross. It analyzed the influence of the earthquake response of the design parameters. And it summarized the earthquake response rules of the design parameters.The results show that the pier height and pier rigidity are the most sensitive for self-vibration characteristics. For seismic response, no tie beam is favorable, and the larger space of double thin-wall piers will decrease dynamic response. And it is beneficial too, the influence of the solid pier is less than hollow pier.The study of the paper on high piers of large-span curved continuous rigid frame bridge of seismic response of the research results can guide the seismic design of the similar bridges. It also can be used for similar bridges in the parameters optimization design.