Finite Analysis On The Innovative Brace Dissipated Energy By Yielded Perforated Web

The center brace has large lateral stiffness,but it is easy to get into plasticity under the earthquakeaction.In order to avoid buckling of the brace,an innovative brace dissipated energy by yielded perforated web is proposed.Under the action of a small earthquake,the short column between the holes of the web firstly shears and yields into the plastic to dissipate energy.The open web is a weak part.Under the rare earthquake,the short column between the holes is bent and damaged.The entire web has shear damage and dissipates the seismic energy.At this time,the ultimate bearing capacity of the brace is much lower than the buckling of the brace.The load ensures that the brace does not suffer from overall instability.In this paper,the finite element ABAQUS is used to analyze the hysteretic behavior of welded and fabricated web open-cell yielding energy brace.The effects of different opening parameters on the hysteretic behavior of the brace are obtained,and the welding yield energy is proposed.The design formula of the initial stiffness and yield bearing capacity of the brace and the design method of the assembled yield energy dissipation support.The main work content is as follows:(1)By referring to relevant specification and literatures,the innovative brace dissipated energy by yielded perforated web with different parameters is designed on the basis of existing research.The finite element analysis software ABAQUS was used to establish the models of each specimen,and relevant tests were selected to conduct finite element modeling and compare hysteretic curves,so as to verify the accuracy of the finite element modeling method.(2)To optimize the shape of the holes,the acceptance mechanism,hysteretic loop curve,skeleton curve,stiffness degradation curve and energy dissipation capacity of the specimens under different parameters were analyzed,and the corresponding influence of different parameters on the energy dissipation support of the open web was obtained.The results show that the length,thickness and spacing of the perforated webs are the determinants of the carrying capacity and hysteretic performance of the energy-dissipated brace,and the energy dissipation performance of the double-layer perforated webs is better than that of the single-layer webs.The formulas for calculating the initial stiffness and yield bearing capacity of the web's perforated yield energy dissipation support are proposed.which is similar to the finite element calculation result and has certain reference value.(3)Two sets of the brace dissipated energy by yielded perforated web with different shapes was added and compared with the slotted hole.The results show that: When the minimum hole spacing is the same,the bearing capacity and stiffness of the elliptical hole brace are the highest.The hysteretic performance of the elliptical and long circular hole brace is stable,which can be used as the design parameter of the new type of open-hole energy dissipation brace.When the width of the openings is the same,the bearing capacity and stiffness of the diamind hole brace are the highest.However,the hysteresis performance of diamond-shaped hole brace varies greatly and should not be used.(4)Based on the research mentioned above,new fabricated brace dissipated energy by yielded perforated web is proposed,which is easy to replace after the earthquake.Four groups of eight specimens were designed to study the influence of each parameter on the hysteresis performance of the prefabricated plate with open hole energy dissipation brace.The finite element modeling method mentioned above is used for analysis,and the design method of new fabricated brace dissipated energy by yielded perforated web is given.The results show that the increase of the length,thickness and spacing of the perforated web will increase the bearing capacity and initial stiffness of the new fabricated brace dissipated energy by yielded perforated web.