| Part of the early construction of the bridges,they can not adapt to the rapid development of modern transportation,so they were demolished and rebuilt,in which the old bridges demolition process are difficult and with high risk,there are many uncertainties and hidden dangers,in order to protect the safety of bridge demolition process,it is necessary to use a variety of modern methods and computer aided procedures,including all kinds of common finite element calculation software,to ensure the demolition of the project design and construction monitoring successfully.This thesis based on the previous research,referred to the third-line demolition of the B-ramp of the Qingkou Interchange Bridge,according to its structural system,engineering size and environmental profile,found out the best way to remove the structure by comparing the schemes,determined the overall construction program and improved the entire demolition process.The integral finite element model which can reflect the actual project and the simulation of each demolition process were accomplished.Above all,the stress and deformation of the structure were calculated and analyzed,and the stability of the support system was checked,supplying the control index and technical support for the intelligent early warning monitoring system,ensuring the demolition process being in the safe controllable range.The research can provide technical guidance and analysis ideas for similar projects in the future.Through combining the finite element simulation analysis with the modern construction method,we can grasp the current situation of the main body of the project,forecast the follow-up conditions,give the early warning order to improve the demolition process immediately and ensure the quality of the project,it not only can make the demolition process safe,but its greater value lies in the ability to adapt to a variety of complex environments and bridge types of demolition,enrich and innovate the old bridge demolition methods. |
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