The Construction Control And Forced Characteristics Study Of The Asymmetry Layout Multi-span Continuous Bridge

In recent years,with the proposal of "13th five-year plan" and "One Belt And One Road" plan,China has started another wave of large-scale infrastructure construction.The infrastructure mostly in remote areas,and the geological conditions are rather complex.In order to overcome this situation,we need more flexible span layout when designing continuous girder bridges.However,in the previous design of continuous girder bridge,there are more symmetrical span layout and abundant theoretical research results.The research of asymmetric bridge is not sufficient and needs to be perfected.This paper takes the Junshan side of the Dongting Lake bridge as the research object.The construction control and force characteristics of asymmetric bridge are studied in the following three aspects:(1)The finite element software Midas/Civil is applied to simulate the construction process of the auxiliary side bridge of Junshan side bridge.The deflection and force changes of the main girder during the construction stages of the asymmetric continuous girder bridge are analyzed,so as to provide theoretical guidance for the construction control.In addition,in view of the time-varying characteristics of concrete materials,the effect of concrete shrinkage and creep on the deflection and stress of the construction stage and the bridge stage is studied and analyzed,and beneficial conclusions are obtained.(2)The precamber is calculated by using the finite element model;Using adaptive control theory to construction control of the the Junshan side bridge.Identification of the sensitivity parameters of the bridge.According to the actual state of the structure,the least square method is used to correct the sensitivity parameters,and adjust the next stage of precamber.Through the analysis of the field monitoring data,the monitoring situation is good.(3)Established a symmetrical continuous girder bridge bridge as a contrast,compare with the Junshan side bridge.Summarized the stress characteristics of asymmetric continuous girder Bridges under the action of load,vehicle load,temperature load and foundation settlement,and provided theoretical results for practical engineering applications.