Static And Dynamical Characteristics And TMD Damping Research Of The Concrete Filled Steel Tubular Arch Bridge

Study on the structure which combines concrete and steel started in China in1950s, andthe concrete filled steel tubular structure has been applied in many aspects of structrural fieldsin China, including CFST arch bridges, which solve the problem related to intensity ofmaterial and simplification of arch bib construction. The development of CFST arch bridgeshas been rapidly developed since 1990s. The research target in this paper—the quay trestle for300000-ton oil tankers in Dalian new prot, is one type of through arch bridges whoseapplications appear earlier than the theory for this type of bridges. In other words, there stillremains lack of a good theory support for so many applications in engineering reality. Thereare no clear clauses on aseismic performance of CFST arch bridges in the present criterions.Furthermore, there is not too much literature related to aseismic performance of these archbridges. So important attention should be paid in this field. For the above reasons, some workhas been performed in this paper and the specific contents are as follows:1. Numerical analysis has been developed with the finite element software ANSYS. Toavoid the shortages in the building of the FEA model, expecially for the analogue of materialnonlinearity, two methods are adopted in the paper, which are the double elements methodand the uniform element method, and the responses of the bridge model under gravity and thefull load are also studied in this paper.2. Structural dynamic characteristics including natural vibrations and mode shapes aregotten by mode analysis of the bridge with finite element program ANSYS. The influence ofstructure forms on structural dynamic characteristics is analyzed.3. Because of its high intensity and long span, stability is regarded comparatively inpractice at all times. The ANSYS method and the arc-length method are combined in thispaper. The stability of this bridge is analyzed in consideration of geometry nonlinearity. Thebucking load and the stability security factor are calculated.4. Responses of each component under earthquake loads and TMD damping are mainlyresearched in the last part of the paper. By performing numerical analysis under many seismicwave input, the responses and deformation of the key components in the bridge are studied.The vibration reduction effect of the TMD-bridge system on the bridge body and the withinoil pipelines is analyzed.All the work in this paper is combined with the practical project and the conclusionsprovide some practical reference to the design of similar projects. The expectation ofadvanced research is presented on the basis of the conclusions drawn in the paper.