Test Research And Finite Element Analysis On Hysteretic Behavior Of A Brace Dissipated Energy By Yielded Flexural Connecting Plates

Under the action of fortify and rare earthquakes,it is easy for the diagonal brace of the concentrically-braced frame structure to lose stability under compression.In order to avoid the buckling of the diagonal brace,a brace dissipated energy by yielded flexural connecting plates is proposed,which combin the energy dissipation principle of the metal damper and the structural form of the central brace.Under the action of earthquake,the connecting plates of energy dissipating brace disspate energy by bending into the plastic to ensure that the main parts of the brace does not lose its stability.In this paper,the hysteretic behavior of the brace dissipated energy by yield flexural connecting plates is studied by combining the experimental study with the finite element analysis of ABAQUS.In order to optimize the carrying capacity of the brace dissipated energy by yield flexural plates,the brace dissipated energy by yielded flexural-and-shear plates is proposed and analyzed by finite element method.The research contents are as follows:(1)The quasistatic test is carried out to study the influence of different shapes of connecting plates on the performance of the brace dissipated energy by yield flexural connecting plates.The test results show that the hysteretic curve of the brace dissipated energy by yield flexural connecting plates is full and the deformation capacity is good.The shape of the connecting plate has a great influence on the performance of the yield energy dissipation brace.The larger the area of the connecting plate is,the better the hysteretic behavior and carrying capacity of the yield energy dissipation brace are,but the difference of the energy dissipation capacity is not significant.The finite element software ABAQUS is used to establish the test model,and the reliability of the finite element modeling method is verified by comparing with the test results.(2)The hysteretic behavior of the brace dissipated energy by yield flexural connecting plates under different design parameters was analyzed by finite element software ABAQUS.The results show that the brace dissipated energy by yield flexural connecting platesdissipates energy through the bending of its connecting plates,the hysteretic curve is full,and the energy dissipation ability is superior.Width of the narrowest part,height,thickness and quantity of the connecting plates are important factors affecting the mechanical properties of the brace.The theoretical formulas of initial stiffness and yield bearing capacity of braces are deduced.The calculated results of formulas are in good agreement with the results of finite element.(3)The hysteretic behavior of the brace dissipated energy by yielded flexural-and-shear plates was analyzed by ABAQUS,and compared with that of the brace dissipated energy by yielded flexural plates.At the same time,the energy dissipation capacity of the brace dissipated energy by yielded flexural-and-shear plates with different design parameters is investigated.The results show that its initial stiffness and yield capacity are greatly improved compared with the brace dissipated energy by yielded flexural plates.The ratio of height to width and the ratio of height to thickness of shear plates are important factors affecting the mechanical properties of the brace.The calculation formulas of initial stiffness and yield bearing capacity of the brace dissipated energy by yielded flexural-and-shear plates are deduced.The calculated results of formulas are in good agreement with the results of finite element.