Faced with the problem of time-delay in the structural active control, the active control based on the output vector prediction in the structural vibration is proposed. Also, the thesis devises a plan of forecast active control, where the gray model GM(1,1) is used as the prediction model and the Matlab program is applied to the Computer Simulation Analysis. Adopting the plan in the aseismatic control of a 5-floor building and comparing the computation results with the control effect acquired from the references , numerical simulation results show that the gray forecast active control can lessen the time-delay effects on the structural vibration control which is superior to that in the references .
is article presents the experimental and finite element (FE) analyses of two conventional rectangular concrete-filled steel tubular (CFT) stub columns, two stiffened rectangular concrete-filled steel tubular (SCFT) stub columns, and two stirrup confinement rectangular concrete-filled steel tubular (CCFT) stub columns concentrically loaded in compression to failure. e influences of the ductility and ultimate bearing strength of these stub columns with stiffening ribs or spiral stirrup confinement were discussed. Abaqus was used to establish a 3D FE model and analyze the properties of CFT stub columns subjected to axial compression. e effect of the concrete core and rectangular steel tube under loop stirrup confinement was discussed. Analytical results showed that spiral stirrup confinement can availably retard the local bucking of the rectangular steel pipe, and the effect of the spiral stirrup confinement was stronger than that of stiffeners. e DI values of SCFT and CCFT were 21.9% and 31.9% larger than those of CFT, respectively. e ultimate capacity values of SCFTand CCFT were 10.2% and 18% larger than those of CFT, respectively. e ductility and ultimate bearing strength of the specimens improved effectively under spiral stirrup confinement, and the ductility of the CCFT columns was preferable to that of the SCFT columns.
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