Experimental And Fem Study On Seismic Behavior Of Y-shaped Steel Tubular With In-filled Concrete Column And Reinforced Concrete Platform Structure

With the development of economy，The progress of technology and The growthof life needs，The subway engineering has been vigorously developed in our country.According to the statistics of relevant departments, a total of20cities have their ownsubway in our country as of May2013, the total operating mileage is2518.6km; thereare32cities who has subway engineering under construction, the total mileage ofsubway engineering under construction is2775.6km; the all the city’s total planningmileage of subway engineering is12481.24km. According to these statistical results,the mileage of Subway construction is so amazing.For so huge subway engineering, the study of standing pillars is a very importanttopic. Concrete filled steel tube was used in subway station in the1960s for the firsttime in our country. AT first, it was applied for standing pillar of "Beijing station" and" Qianmen station" in subway line2. Afterwards, it was adopted by the full circlesubway line of Beijing and even the whole country’s subway engineering. Therefore,the study of concrete filled steel tube structure has very important significance.Along with the continuous development and innovation of architecturalform, civil engineering has a increasingly demand for special-shaped concrete-filledsteel tube structure. A large number of scholars have done a lot of work onspecial-shaped concrete-filled steel tube structure. However, the study of Y-shapedconcrete-filled steel tube structure is still less. This paper takes this special kind ofstructure as degree subject for research.Taking concrete-filled tubular steel Y-shape column and concrete platformstructure of a two-layer subway station as prototype, this study aims to design testcomponent and complete pseudo-static test. It observes concrete structure crack, thechanging process of the rift, strain variation of tubular steel surface, analyzing stressstate of structure, and make statistics, analyzing characteristics of the horizontalforce-axial displacement curve, skeleton curve, equivalent stiffness degradation,equivalent viscous damping ratio, studying anti-seismic performance of structures.The results show that: the design of Y-shape castings, concrete-filled tubular steelcolumns, the connecting structure, embedded parts are reliable in force. The concretestructure and concrete-filled tubular steel Y-shape column achieve good results in collaborative work. The study found redistribution phenomenon of internal forcewhen lateral structure increased gradually，the changing process of the energydissipation mechanism of internal structure and staged energy consumption law.In order to compare with the test results, this paper analyzes the test componentwith the finite element analysis software, ABAQUS. In order to change the deficiencyof test and restore the working state of the test components in prototype，this paper setup a new finite element model which is close to the actual. And compare it with themodel which is close to the situation in test.