Statical And Dynamic Analysis And Monitoring Scheme Design Of Simply Supported Steel Box Composite Arch Bidge Of Span Of 96m

Steel box through tied-arch bridges own many superiorities,such as good dynamic performance,long span ability,high stiffness,low building height,good-looking appearance and so on.Because of those advantages,it is popularity.However,the long span steel box composite arch bridges are less used on the high-speed railway and some problems remain to be researched.Based on the Beijing-shanghai high-speed railway long span steel box composite arch bridge,the static analysis,the dynamic characteristics analysis,the dynamic analysis under the train load and monitoring scheme design are carried on.The concrete content are as follows:ANSYS,a large scale general finite element analysis software,is adopted to establish the finite element model of the whole bridge and calculate the model.The static analysis is based on the finite element model of the whole bridge and the responses of the typical sections are extracted.The results show that the deformations and internal force don't exceed the limits,namely that the static design meets the requirements.Meanwhile,the locations whose displacements and internal force are larger are determined.The following steps are the dynamic characteristics analysis and the dynamic analysis under the train load.We can concluded from the consequences that the natural frequency of horizontal and vertical of the bridge are within the requirements.At the same time,the results reflect that the horizontal bending rigidity of the rib is smaller which is common in this kind of bridge.The train load is reduced to exciting force and many loading conditions are considered.The results of dynamic displacement and acceleration are revealed by some tables.By analyzing the dates,we draw the conclusions that the dynamic displacements are reasonable and the acceleration meet the requirments.The design of the monitoring scheme is based on the result datas of the static analysis,the dynamic characteristics analysis and the dynamic analysis under the train load.The main monitoring terms,the layout of the monitoring points and the sensors' technical requirments are proposed.The results of this article provide some bases for the monitoring of the Beijing-shanghai high-speed railway long span steel box composite arch bridge.For the rest of the same type bridge,they deserve reference value.