Analysis On Dynamic Characteristics And Seismic Performance Of Three-span Variable Cross-section Corrugated Steel Web Continuous Yanbai Bridge

Focusing on the current research of the corrugated steel web plate girder bridge and for the purpose of optimization of this kind of bridge's design,based on the actual engineering of a corrugated steel web PC composite girder bridge,the article has been researched its inherent dynamic characteristics and response under the E1 earthquake.Further more,this article analysised the difference of its inherent dynamic characteristics and response under the E1 earthquake with the equivalent concrete PC web composite girder bridge.Least but not the last,these researchs draw some conclusions:reveal the similarities and differences between the corrugated steel web PC composite girder bridge with the equivalent concrete PC web composite girder bridge,different parameters changes affect the dynamic characteristics of the corrugated steel web PC composite girder bridge,in order to provide certain reference basis for optimizing this type of bridge's design and promoting its application in the engineering.Further more,these researchs also layed the foundation for the responses of this style bridge under external dynamic loads.In summary,this article completed several works on the researchs:(1)On the basis of arranging and studying the datums related the dynamic characteristics and seismic response of this corrugated steel web plate girder bridge,the article discussed the development of the PC composite girder bridge with corrugated steel webs,the structural characteristics,the advantages and disadvantages of this type of bridge and the current research status at home and abroad in detail.Further more,focusing on the frontier problems in the research of this type of bridge,this article further clarifies the content of the research.(2)Based on the bridge's dynamics knowledge,this article gave a simple introduction on the content and principle of the bridge's dynamic and its vibration analysis method.Among these works,this paper introduces the finite element method in bridge used in the study of power,in order to lay a solid theoretical basis for the later chapter of researchs.(3)Using the finite elements analysis software(ANSYS)to establish three span continuous variable cross-section finite element model of corrugated steel web PC composite girder bridge and the finite element model of equivalent concrete PC composite girder bridge,this paper gave a detailed description of the fine processing key issues in the modeling process and its methods.Then,this paper analyzed and compared two kinds of bridge's dynamic performance.(4)by changing the midspan diaphragm plate,external prestressing,depth-span ratio and bearing of the four parameters,This paper analyzed its effects of three span continuous variable cross-section corrugated steel web PC composite beam bridge's dynamic characteristics.Further more,this paper summarized parameters' influences on The dynamic characteristics of the bridge and put forward the research on the effects of parameters on its dynamic characteristics should be considered more coupling parameters change,by consulting relevant data.(5)In learning bridge seismic analysis based on knowledge and norms,this paper designed a horizontal and vertical acceleration response spectrum,according to our country related to seismic specification.Further more,this paper,by using ANSYS software,analysised the seismic response of the corrugated steel web plate girder bridge and the equivalent concrete web girder bridge separately under the response spectrum method.Then,this paper compared the seismic response with each other.