Study On Seismic Performance Of The Hyperbolic Type Lead-filled Stainless Steel Tube Damper

In order to further improve the ductility,corrosion resistance and durability of the lead-filled steel tube damper,the hyperbolic type lead-filled stainless steel tube damper(referred to as H-LSSTD)was presented in this paper.Its structure,principles and characteristics were introduced.Finite element analysis software ABAQUS and low cycle repeated test were used to study its construction and properties.Specific work contents and conclusions are as follows:(1)The stress-strain model of stainless steel was summarized and compared in order to specify the type of stainless steel and its constitutive model used in this paper.The selected constitutive model was used for ABAQUS finite element analysis to compare the mechanical properties of H-LSSTD and the ordinary hyperbolic type lead-filled steel tube damper(referred to as H-LSTD).The result shows that when the initial yield capacity of H-LSSTD is equal to that of H-LSTD,the H-LSSTD enters into a more stable energy dissipation state with a smaller displacement,and provides a larger stable yield bearing capacity and ultimate bearing capacity;(2)A H-LSSTD specimen was designed for feasibility test and its hysteretic performance,fatigue performance and large deformation capacity were studied by low cycle repeated test.The results show that the damper enters the yield energy dissipation under small displacement and has a large ultimate deformation capacity;the hysteretic curve of it is symmetric and full.The skeleton curve is symmetric,and the hysteretic characteristics can be described by using a trilinear mechanical model;There are little difference of the bearing capacity and ring area between the three laps under the same displacement;It can carry out fatigue cyclic loading for many times after hystertic performance test,and has excellent and stable energy dissipation capacity during fatigue loading;(3)In order to simplify the fabrication process,finite element analysis software named ABAQUS was adopted to put forward different end structures of the damper.The H-LSSTD with an inverted parabolic transition section is called class A,and the one without transition section is called class B.Both of class A and B have excellent mechanical properties,class B not only simplify the processing technic,but also reduce the consumption of stainless steel and lead core,and improve the economy.Finite element analysis of H-LSSTD with different end structures were carried out.The influence of design parameters on plastic strain distribution and mechanical properties was studied,and recommended values were given.