Simulation Analysis For The Pumping Liquid Concrete Process Of Concrete-Filled Steel Tube Arch Bridge

Concrete-filled steel tube (CFST) arch bridge has developed rapidly in China since1990s.With the increasingly rise of the scale and number of such kind of bridges, the constructiontechnology of CFST arch bridge we hold has reached world advanced level. Compared withthe engineering practice, the theories about this kind of bridge are relatively backward, suchas any unified and complete technical specifications of CFST arch bridge has beenpromulgated until now. As a result, we can’t offer the applicable guidelines to this kindbridges’ construction in China. The process of pumping liquid concrete in which the state ofthe structure stress significantly changes is the key step and it usually directly influences thearch rib’s stiffness, stress and the bridge’s bearing capacity. Study on structure simulation andpumping sequence in process of pumping liquid concrete will meet the demands of theoreticaland practical development because of a lack of research in such aspect. Based on the researchsubject of “Research on the Key Technique for Construction Monitoring and Control ofSuper-Broadening and Long-span CFST Basket Handle Arch Bridge” funded by Hebeicommunication department and Hutuo River Bridge located at Shi Jiazhuang in Beijing-ShiJiazhuang highway project, this paper studied on the analysis of simulation calculation on theentire process of pumping liquid concrete in the steel-tube.1. Using Collinear Double Element Method and Combined Section Method to simulatethe arch rib, this paper analyzed the process of pumping liquid concrete and contrasted thecomputing result with the actual measurement record. The results indicated that both TheCollinear Double Element Model and The Conversion Section Model are feasible in actualapplication to simulate the CFST arch bridges’ construction process of pumping liquidconcrete.2. The impact of pumping sequence on the CFST arch rib’s stress，displacement andstability were analyzed by setting up different construction finite element model of order. Theresults of the analysis and computation are summarized as follow:①The stress at arch springand the displacement at arch top can be selected as evaluation indices of pumping sequence.In addition, the stability of arch rib when pumping upper chord is the weakest in theconstruction stages.②Pumping sequence has no an apparent influence on arch rib’s stress, displacement and stability because the supported project were designed conservatively causethe largely arch rib stiffness.③The arch rib’s stress and displacement are small in actualconstruction, so the designed pumping sequence for the supported project is reasonable.In this paper, the reliability of simulation methods was verified, which will providesimulation analysis of CFST arch bridge with theoretical support and reference in the future.What’s more, study on pumping sequence will offer useful help and a bit of good experienceto construction design and control of this kind of bridge in the process of pumping liquidconcrete. Therefore, the study in the paper will not only be favorable for this kind of bridge’stheoretical development, but also ensure its construction safety. In brief, the studies areessential in both theory aspect and practical aspect.