Research On Health Monitoring Technique Of High-rise Building With Viscous Dampers

With the development of China’s economy and engineering technology,the number of wind-sensitive high-rise buildings in the city is increasing.With high soft and low damping characteristics,the wind-sensitive high-rise buildings are higher sensitive to wind loads.In order to reduce the impact of daily wind vibration on the performance of the structure,viscous dampers are now widely installed in wind-sensitive high-rise buildings.But viscous dampers are prone to damage and failure in the state of frequent vibration.At present,there is a lack of long-term monitoring of viscous dampers in order to promptly inform the manufacturers of the damage and maintain their normal working performance.In addition,the manufacturers test viscous damper performance by methods which based on a single fixed frequency low frequency sinusoidal excitation of the viscous damper,the lack of viscous dampers in the random vibration state of performance testing.It is uncertain whether the energy dissipation of the viscous damper is consistent with the parameters given by the manufacturer under the daily random wind vibration.At present,there is a lack of a practical viscous damper monitoring method,both for the maintenance of viscous damper is also used to maintain the performance,but also for viscous dampers in the daily work under the action of wind vibration.In addition,wind-sensitive high-rise building in the wind due to the wind-induced vibration is likely to cause fatigue damage,the performance of the structure decreased,and China is a frequent earthquake,seismic belt distribution in the country,due to wind-induced fatigue damage caused by structural seismic performance In order to ensure the wind-sensitive high-rise buildings in the city are in a normal state of health on a large scale,wind-sensitive high-rise buildings with high wind sensitivity are lacking at present.A low-cost building monitoring technology to mitigate the problem that high cost of high-rise buildings can not be a wide range of wind-sensitive structural health monitoring technology in the application,maintaining health of wind-sensitive high-rise buildings in the cities.In order to solve the above problems,two subsystems of the three subsystems of wind-sensitive high-rise building health monitoring system are established,which are viscous damper monitoring system and high-rise structure monitoring system under wind-induced vibration.The research work includes the following aspect:1、The thesis established a low-cost wind sensitive high-rise building health monitoring platform composed of viscous damper monitoring module,high-level structure monitoring module under wind-induced vibration and post-earthquake damage assessment module.High-rise structure monitoring,and rapid damage assessment after structural earthquake are important factors to maintain the health of high-rise buildings.In order to enhance the cooperative relations of various systems and improve the efficiency of building health monitoring,A set of low-cost wind-sensitive high-rise building health monitoring system composed of viscous damper monitoring module,high-level structure monitoring module under wind-induced vibration and rapid damage assessment module after earthquake.A software system is developed to process and analyze the measured data,to identify the structure damage and to evaluate the structure damage and data storage.2、The thesis established the viscous damper monitoring system software,the functions are as follows:① Through the analysis of the actual working characteristics of viscous dampers under wind-induced vibration,the viscous damping force-velocity in different frequency range is obtained.Relationship,for the current manufacturers given viscous damper specification parameters to be amended.②Through analyzing the trend curves of the viscous damping force-velocity curve,the damper can be judged to be in normal working condition,which can be used to maintain the normal working performance of the viscous dampers.The parameters of the viscous dampers which are close to the actual working conditions of the actual dampers are obtained by fitting the measured damping force-velocity data to the measured wind speed data.When the measured and simulated wind-induced vibrations are compared and analyzed,the viscous damper element parameter setting in the finite element model is modified.3、The thesis established a high-rise building health monitoring system software.The health monitoring of the high-rise structure was carried out in two stages:①In the first stage,the structure was monitored in real time by using a small amount of instruments for a long time;Damage modal analysis,damage monitoring layer and floor range analysis,wind vibration comfort analysis,to achieve a preliminary assessment of the health status of the structure under the condition of reducing costs.②In the second stage,the density of the instrument layout is increased,and the difference between the actual measured data and the simulated data is analyzed on the basis of the analysis result of phase one.The concrete damage floor is achieved under the condition of reducing cost.According to the actual damage situation,give a safety warning to prevent the structure in the whole life of the encounter strong winds or earthquake serious damage or damage.4、The thesis chosen a wind sensitive high-rise building in Guangzhou as the object of study.The instrument layout and real-time monitoring of the first stage of the high-rise structure monitoring system under viscous damper monitoring system and wind-induced vibration were selected.The viscoelastic damping force-velocity contrast analysis and the comparison of the wind-induced vibration response of the viscous dampers before and after the modification of the viscous dampers were carried out.The results show that:①Below the reference speed,there is a large difference between the actual damping force output state of the viscous dampers and the damping force output states described by the manufacturer giving the specifications.②The viscous damper in the low-speed low-frequency wind-induced vibration of the actual state of the role of energy consumption and theoretical design of a larger difference in manufacturers of viscous damper performance testing,the damping should be determined at different speeds And the working characteristics of the frequency range specifications parameters,a more realistic response viscous dampers the actual energy consumption.