Numerical Research In Static Behavior Of Large-span Steel And Concrete Continuous Girder Bridge With Constant Section

Design of Composite Girders for Non-Navigable Span Bridge of HongKong-Zhuhai-Macau Bridge in Shallow Water Area adopts85m steel mix withconcrete continuous beam and5～6hole each group. The construction of the bridgeadopts some advanced method, such as: the lifting of the whole arch of long supports,the conversion from simple beam to continuous beam, the jacking and falling ofsupporting point and the tension of prestressed bar tendon in bridge deck of hoggingmoment region. The bridge of combinational and continuous beam experiences theconversion of different structural systems from simple beam to continuous beam fromconstruction to completion, the change of the sequence of construction has differenteffect on the line shape of bridge and internal force.At present, the bridge ofcombinational and continuous beam aren’t still widely applied in China, and thetechnology of construction isn’t still mature enough. But, with the rapid developmentof FEM, various professional software about bridge has been widely applied.So, it isnecessary to analyze the internal force and it’s change rules of the bridge ofcombinational and continuous beam by FEM.The paper takes the HongKong-ZhuHai-Macao Bridge as the background, andbuild the finite element models of the combinational and continuous beam byMIDAS/Civil and FEA. According to the construction sequence, the division ofworking condition and the temperature effect, I make a systematic simulation analysisabout the lifting of the whole arch of long supports, the conversion from simple beamto continuous beam, the jacking and falling of supporting point as well as the shrinkand creep and the temperature effect after the completion. Besides, I also analyze theparameter of the actual engineering example. The research of my paper provides ascientific basis for the design and construction of the combinational and continuousbeam, and it has important theoretical and practical significance to comprehensivelygrasp the linear change of the structure and the characteristics of internal force andfurther improve the analysis level of the composite beam.The main contents and results of the research are as follows:①Use the finite element software MIDAS/Civil to build6×85m composite continuous box girder bridge finite element model, make the accurate simulationanalysis of the small section of the whole hole hoisting, simply supported continuoussystem conversion, pivot top up and down and in the negative moment region ofprestressed tensioning construction process to come true. Also obtain the feature ofeach construction procedure and the bridge structure under the condition of linearchange and internal force distribution.②According to the finite element model of the6×85m bridge combinedcontinuous beam, to make the simulation analysis in different working conditionssuch as, temperature effect of composite continuous girder bridge, shrinkage, creepunder to obtained the distribution feature of the composite continuous girder bridgeunder temperature load, creep and shrinkage, the conditions of linear change and theinternal force.③For the phenomenon of composite beam about local instability in constructionstage, through FEA to establish the plate finite element model for the analysis ofparameters coMParison to put forward the reasonably temporary storage stagesupporting decorate form, bearing pad place, supporting position of rationalarrangement of stiffening rib and also analyze the Influence law about Bearing uneveneffect on composite beams.