Study On The Seismic Performance Of Concrete Filled Steel Tubular Lattice Column

A large number of experimental and theoretical studies about concrete filled steel tubular laced columns mechanical properties under axial and eccentric compression has been studied at home and abroad,but when it refers to the seismic performance,less has been found.In this thesis,experimental study and finite element analysis have been used to explore the seismic performance of Concrete filled steel tubular laced columns.The main work and conclusions are as follows:(1) Based on existing theories, experiments of seismic performance of concrete filled steel tubular laced column has been carried out, including six components under low cyclic loads and two components under seismic waves;(2) Appropriate constitutive relations and damage relationship has been selected to built finite element models with finite element analysis software ABAQUS.Finite element calculations are compared with experimental results which verify the validity of the model, after that,the main causes of differences between the model and the experiment has been analyzed. Based on the model, the process of force and the way of failure of the mode have been analyzed, and then result shows that the concrete filled steel tube laced column has a good ductility and energy dissipation performance, which means it has a excellent seismic performance;(3) Based on the finite element model,parameters impact analysis of concrete filled steel tubular laced column has been carried out, including the axial compression ratio, the strength of core concrete, the location of the holes and the ratio of the steel components.The results show that:axial compression ratio has the greatest impact on the the seismic performance of concrete filled steel tubular laced,when the axial compression ratio increase,ductility decreases. Steel ratio only effects elastic phase, when comes to the ductility, they not work.The strength of the core concrete has little effect on both Elastic and ductility.The impact of open hole will be different as the location of the hole differs.