Research On Anti-Seismic And Anti-Collapse Performance Of New Type Joint Damper

Energy dissipation technology has a high component in the field of seismic control of engineering structures,and it is also one of the main directions of structural seismic research in civil engineering.Therefore,this technology has become a hot topic for many experts and scholars in the world to study seismic control technology topic.The metal shock absorber is a high-efficiency and energy-saving shock-absorbing device,which has obvious advantages in material selection,manufacturing,ease of installation,durability and price.This paper proposes a new type of bending-shear-torsion and pure torsion metal damper.The mechanical properties of the damper are studied through experiments and numerical simulations.The damper is applied to the Y-supported steel frame structure,and the aseismic performance is studied by finite element method.The main tasks completed are:1)Propose a new type of pure torsion and bending shear torsion combined deformation metal damper is proposed,and its main characteristics and advantages are analyzed.The thickness of the steel tube and the damper with and without shaft are studied,and the influence of material,wall thickness and other parameters on the damper is investigated;the failure mode,hysteretic performance,energy dissipation capacity,deformation capacity,stiffness and strength degradation of the damper are studied by cyclic loading test.2)Based on the theoretical analysis of the test results,the calculation expressions of the initial stiffness and yield load of the pure torsional damper are given through derivation;the appropriate materials,elements and contact methods are selected based on the ABAQUS finite element software to numerically simulate the test process,and Carry out parameterized research on important indexes such as tube wall thickness and tube length,and compare and analyze with the test results.At the same time,the relationship between important parameters of the damper and its main mechanical properties is given through regression analysis.3)Apply the new torsional damper proposed in this paper to the inverted Y-shaped steel support structure,establish a plane-supported steel frame structure with torsional dampers,an unsupported steel frame structure,and a Y-shaped steel support corresponding to the shear-type yield energy dissipation beam section The finite element model of the structure,select 5 typical ground motions,respectively perform nonlinear dynamic time-history analysis on them,study the seismic response of the structure under the action of frequent and rare earthquakes under various conditions,and its vertex displacement and interlayer displacement The main structural seismic performance indicators such as angle and base shear are analyzed.