| In recent years,with the development of construction,more and more high-rise buildings have been built all over the country.The wind load leads to the vibration of these buildings,when the vibration reaches a certain limit,the safety and service performance of the structures will be affected.It can be seen that the vibration control of the high-rise structure is very important.The viscous damper does not store stiffness or change the stiffness characteristics of the structure at low frequencies,and it is a speed dependent energy consuming device that requires only a small interlayer displacement to produce a large damping force in the damper,thereby consuming a large amount of vibration energy.The viscous dampers are arranged approximately in the vertical direction between the end of the outriggers and the outer frame columns.The system has the effect of amplifying the inter-story displacement,and its vibration damping performance is good,but this kind of structure is still comparatively uncommon in engineering and research.In this paper,the three-dimensional finite element model of a 50-storey steel frame-concrete core wall structure is established to study the wind performance of high-rise structure with damped outrigger storys.The main contents are as follows:(1)The fluctuating wind field of the structure is simulated by the harmony superposition method,and the wind speed of time and the wind pressure of time at each floor are obtained.The numerical simulation spectrum is compared with the target spectrum to verify the correctness of simulation results.The results show that the simulation spectrum is highly consistent with the target,and the accuracy of the simulation results is further verified.(2)Using MIDAS Gen finite element software to establish the structural calculation model,the along-wind induced vibration analysis of the structure under three simulated fluctuating wind fields is obtained,and the wind-induced vibration comfort is evaluated.The results indicate that the mean peak acceleration in X-axis under does not meet the comfort limits of Chinese code,North American code,ISO 10137 and the AIJ-2004.(3)The along-wind induced vibration analysis of the original structure and the structure with damping outrigger storeys under the simulating wind load are finished,also the influence of the number and position of damping outrigger storey on wind resistance performance of the 50-storey steel frame-concrete core wall structure is discussed.The analysis results show that:the rational number and optimal arrangement of damping outrigger storey can effectively improve the comfort level and wind resistance performance of tall steel frame-concrete core wall structure.(4)Assuming that the total damping coefficients and other parameters of single viscous damper are unchanged,wind resistance performance of high-rise buildings with different damping layers are compared,and the results indicate that the total performance of the buildings with multiple damping layers is better.(5)Assuming that other parameters of single damper are unchanged,the wind-induced response in the high-rise building with damping rigid outrigger storeys is changing with its total damping coefficients.The wind resistance performance of the structure is better when the value of reasonable total damping coefficient is around the optimal damping coefficient.When the viscous dampers are arranged approximately in the vertical direction,the wind resistance performance of the three different forms of outrigger is compared and analyzed.It is found that the wind effect of the different forms of the truss is quite close. |
