| Concrete filled steel tube structure has a unique advantage in the building structurewith making full use of respective advantages of the steel and concrete materials, and isused more and more widely in the engineering application in recent years. However,focused primarily on the component of the study, the research in the joint is still not matureenough relative to the research in the individual component in the past. As the key part ofbuilding structure, problems of joint make the focal points stand out especially in thedesign and construction. Complex joint will impact economic benefits for the construction.Too simple joint leads to cannot achieve bearing capacity, Safety cannot be guaranteed. Sothe research of joint form has the importance and necessity for the application andpopularization of concrete filled steel tube structure.Concrete filled steel tube structure is usually used as column, steel beam or reinforcedconcrete beam combination in past research application. This study proposed a new type ofrepaired concrete-filled rectangular steel tubular beam column frame structure, Concretefilled steel tube structure is introduced in the application of beam, the self-compactingconcrete is pour into beam-column concrete filled steel tubular frame structure as a whole.In this phase of the research work, this kind of new type of square concrete-filled steel tubebeam-column joints is designed, completing quasi static test of the square concrete-filledsteel tube beam-column joints. Through pseudo static test analyzing the joint form ofhysteretic performance, ductility, strength and stiffness degradation, joint domain straindevelopment situation, damage forms and characteristics under bottom weekly cycle load.The experimental results showed that: The hysteretic curve of the joint under the load isfull, still showed good ductility after reaching the limit load, has higher bearing capacity,energy dissipation shows good.Using the finite element software to simulate the quasi static test of the squareconcrete-filled steel tube beam-column joints on the basis of the test. Analyzing jointcomponent in simulation under low cyclic loading conditions with the different parameters change, the axial compression ratio changed and the strength of concrete. The test resultsand finite element analysis of numerical simulation shows that: Finite element numericalsimulation and experimental results are close and can simulate the bearing performance ofthe joint under cycle load under the condition of the reasonable unit model and parameters.The plate of the beam root strength the joint in ductility, axial compression ratio changeeffect on the stress performance of joint structure is significant, concrete strength canslightly improve the bearing capacity of joint component, while comparing with the axialcompression ratio change affect the mechanical properties of components, the effect of theconcrete is not as significant. |
PDF Full Text Request