Research On Mechanical Properties Of Large Span Continuous Rigid Frame Bridge With Corrugated Steel Webs

Corrugated steel web can significantly reduce weight of the upper structure of the bridge, it has advantages of reasonable structure, beautiful shape, less volume, already more and more accepted by our country bridge engineers and application. In this paper, based on the project- Qing Xi bridge(95 m + 180 m + 95 m), as a large span continuous rigid frame bridge with corrugated steel web, the design of the building was rare in china, the lack of the direct experience can refer to. In the light of the actual project, the design parameters for corrugated steel web plate of the static and dynamic analysis and checking calculation of continuous rigid frame bridge. The key mechanical components, shear connectors and corrugated steel web, detailed finite element analysis for them. Research results for the corrugated steel web plate on the large span Bridges have certain reference value to the further application and reference value.This paper mainly completed the following work:First, the static analysis of the Qingxi bridge is performed according to the chinese bridge specifications. The dynamic characteristics for the main bridge box girder is calculated, and compared with ordinary continuous rigid frame bridge. The results show that the static calculation of whole bridge meet the specification requirements. Compared with the common continuous rigid frame bridge, the prestressed effect of corrugated steel web plate continuous rigid frame bridge is higher, It reduces a lot of weight. This article lists the two bridge ten order natural vibration period and vibration mode. Through comprehensive comparison of two bridge, corrugated steel web plate bridge structure stiffness is lower. Structure aseismatic ability is stronger, the bridge is more suitable for high seismic requirement.Secondly, the shear connetor is studied using refinement finite element analysis method. The shear connecter is the critical component which makes the steel and concrete working together. PBL shear connector is built and analy sed through the nonlinear finite element modeling method, and compared with the chinese composite structure specification. The results show that the PBL can fully guarantee the shear connector requirements, and has a high degree of surplus. The increasement of the bridge span usually do not require high strength shear connector. In different position of shear force, we use different PBL shear connector.Finally, the buckling of corrugated steel web is studied by FE simulation. Considering the material nonlinearity and geometric nonlinearity of the corrugated steel web, the influence of the web thickness and shape on the shear buckling load and buckling mode is investigated. In addition, compared to the empirical formula, the overall buckling and local buckling of corrugated steel web plate is also investigated. Results show that when the corrugated steel web plate goes into the buckling condition using nonlinear theory, the results could be conservative. The shape of corrugated steel web plate have larger effects on its shear buckling strength. The influence of different factors on the influence degree of t he corrugated steel web is different. Reasonable design of corrugated steel web plate shape could have optimal working condition.