| Buckling-resident brace damping energy dissipation is used for damping energy dissipation energy consumption on a high-rise building commonly. Due to its simple production and convenient assembly, all steel type BRB is used widely, "-" type of section is one of the most common form of cross section. But experimental study shows that "-" type of section in the form of all steel type BRB exists the following problems: the bearing capacity is insufficient, especially outside restraint stiffness is small, the overall buckling wave often occurred in the inner core, leading to compression performance is poor; Energy performance is insufficient, the soft-core section in tension and compression process is easy to form weak spot, end areas prone to premature low cycle fatigue damage occurs, which will affect its energy performance. For the first time to make up for the shortage, the author puts forward using carbon fiber reinforced composite materials (CFRP)-steel composite slab as a new type of BRB inner core, CFRP-steel composite slab is made up of steel slab and CFRP on the surface, CFRP directly sustains tension when the inner core can effectively reduce the local stress of sheet metal, which improves the filling capacity and improves its mechanical properties; When filling in compression, steel slab surface tension side of CFRP can inhibit the development of the steel slab buckling, the buckling load and the mechanical properties of the inner core can be improved obviously. In this paper, the performance of the new type of CFRP-steel composite BRB inner core are studied.First of all, designed the static hysteresis performance test research of CFRP-steel composite BRB. Test is divided into two groups, respectively, the strong constraint stiffness buckling-resident brace (ABRB) and the weak constraint stiffness buckling-resident brace (SBRB), each component is designed which is corresponding ordinary type all-steel BRB as contrast artifacts. Separately on the basis of the test results of two kinds of different forms of BRB from failure pattern, hysteresis properties, bearing capacity performance and deformation performance and stiffness are analyzed in comparison. Experimental analysis results show that the strong ABRB constraint stiffness, the CFRP-steel composite slab as the inner core can make its buckling deformation along the longitudinal distributed more even, the stress is more even too, the bearing capacity of the hysteretic energy dissipation performance, performance, plastic deformation performance and stiffness are higher, and the performance boost mainly concentrated in the stage of plastic deformation, the inner core and CFRP are stripping completely; For SBRB, using CFRP-steel composite slabs as filling can also has a certain degree of improvement on the bearing capacity of the hysteretic performance, performance and plastic deformation properties and the stiffness, but it can't solve the nature problem of SBRB.Secondly, general finite element software ABAQUS is used to establish two new CFRP-steel composite BRB inner core and the corresponding finite element model of all steel type BRB. Introduced the unit cohesion, and established the finite element model of steel-rubber-CFRP, the factors may influence the results of finite element numerical simulation are discussed. Finite element numerical simulation to get the component test process and actual test phenomenon, hysteresis curve, this paper compares and analyzes found this paper established finite element model of two ABRB component as well as ordinary steel slab SBRB-1 the test process and the component parts of the inner core accord well with the hysteretic performance simulation, proved that the finite element model established in this paper has good applicability, reliability and can be used as a parametric study on the performance of the new type CFRP-steel composite BRB. |
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