Static And Dynamic Characteristics Analysis And Seismic Study Of PC Continuous Rigid Frame Bridge With Corrugated Steel Webs

Corrugated steel web PC composite box girder is a new type of steel-mixed composite structure,which takes the place of ordinary concrete web with corrugated steel plate.When compared with ordinary concrete box girder structure,it not only reduce superstructure weight,but also reduce the load of substructure.The corrugated steel web PC composite box girder bridge has many advantages,for example,high prestressing efficiency,shorter construction period,beautiful appearance.It has been developed rapidly in some countries of Europe,espetially in fance,and studied and applied well in Japan.At present,bridges of this type have a good practicality and development prospect.Their application are developing from simply supporting equal section box girder to variable cross section large span continuous steel structure gradually,the structure is more beautiful and the bearing capacity is higher.Many researches emphasized on the contribution of the corrugated web structure to the bending capacity,shear resistance and torsional resistance of the bridge,and the finite element analysis of corrugated steel web also focused on its static and dynamic characteristics,seldom researches focused on its seismic performance.In this study,taking the small sand dune bridge in Lanzhou as example.Firstly,carrying out the static load test on it,then camparing measured date with the finite element calculation results.Using the finite element method to evaluate the quality,analyze the seismic performance,test the safety performance of bridge structure and its working condition,to judge whether it meet the design criteria and requirements of bridge operation and maintenance.Providing reference for the construction of similar bridges.The main contents of this paper include:(1)Describing the mechanical properties of the corrugated steel web bridge,and summarizing the theoretical results about bending resistance,shear resistance and torsional resistance of the corrugated steel web PC box girder bridge.(2)Through carrying out the static load test on the small sand ditch bridge,experimental data of the bridge key parts were obtained,and they were compared with the results obtained from the finite element software.Then analyzing the deflection and stess distribution of themain section of the main bridge of Xiaoshagou Bridge.The results showed that the deformation of the main bridge of Xiaoshagou Bridge within the small deformation range stipulated by the specification,and the maximum vertical displacement and bridge span ratio were all less than 1/600 of the specification.The displacement calibration coefficient satisfies the general requirement that it should not be higher than 1;Laws for measured stress values of control section mathed well with theoretical analysis.(3)The finite element software were used to analyze the dynamic characteristics of the small sand ditch bridge,and its modal analysis and seismic analysis were carried out to obtain its natural frequency,vibration mode and ground motion effect.The seismic response of the bridge under the E1 earthquake were analyzed by the response spectrum method and the dynamic time history analysis method.In this paper,the general law of the seismic response of the bridge and the internal force is obtained by using the input bridge curve of the standard acceleration response spectrum response spectrum.The dynamic law of the bridge is obtained by the bridge bridge,transverse bridge and vertical action respectively.The law is analyzed by El-Centro wave,Taft wave and artificial wave fitted by normative response spectrum.The rationality of the bridge design is obtained by comparing the results of the two analyzes.