Study On Seismic Performance Of Partially Filled Steel Box-concrete Arch

Partially filled steel box-concrete arch structure is a new structure consisting of steel box and concrete filling.Compared with concrete and steel box structure,partially filled steel box-concrete structure not only highlights the tensile properties of steel but also makes full use of concrete resistance.At the same time,due to the ferrule effect of the steel box on the concrete structure,the partially filled steel box-concrete structure has better structural performance than the general pure steel box structure or pure concrete.For the current research situation,the concrete-filled steel tube structure and steel box concrete structure have made considerable progress in the research of static performance and dynamic performance.In this paper,the seismic performance of partially filled steel box concrete arches is studied.The analysis of the parameters and the seismic performance of the components are analyzed.The paper mainly analyzes the following aspects:(1)Summarize and introduce the seismic analysis methods and theories applicable to partially filled steel box rafts,including static method,response spectrum method and time history analysis method,introduce their respective calculation principles,and compare and analyze the advantages of various methods.Disadvantages.(2)The finite element analysis model was established to analyze the vibration characteristics of the partially filled steel box-concrete arch structure.In the case of considering other parameters unchanged,by changing the value(the ratio of the arched concrete fill length to the span),the cross-sectional fill rate,and the span-to-span ratio,various parameter changes were analyzed for the partially filled-steel box.The influence of the natural vibration characteristics of the concrete arch structure,and the possible influence of structural parameters on the seismic response of the structure.(3)Using the time history analysis method,the seismic response characteristics of partially filled steel box-concrete arch structures were studied.The internal force and displacement response of the structure under the condition of hard and soft ground were investigated respectively,and the effects of the length of the full filling section,the filling rate of the section concrete and the seismic intensity on the internal force and displacement of the arch ring were analyzed.The seismic response law.