Study About High-rise Building Wind-induced Vibration In Construction Based On Field Measurement

In the past decades years, because of the storm disaster to the world caused greatlosses, the wind load have been paid great attention to the effect of structure. At thesame time,the wind loading on the structure design and in particular the importance inthe design of high-rise and super high-rise structure is more and more prominent. Withthe rapid development of high-rise buildings in the world, according to the study ofwind resistance theory of structural wind engineering of high-rise buildings aregradually mature, wind field characteristics of scholars in high-rise buildings have doneresearch theory, wind tunnel test and field test in different levels, with the knowledge ofa system in the structural characteristics of the surface wind pressure the wind speedspectrum and the buildings, but for the study of the wind-induced vibration response oftall building structure in construction period is relatively small. Therefore, for thehigh-rise buildings, especially the structure of shaped high-rise buildings, vibrationresponse in practical measurement structure during construction in the wind load, hasvery important significance for the research of dynamic response of structure and itscharacteristics. Therefore, this paper has done the following work:①For the Junyuhaicheng international hotel project, aiming at the constructioncharacteristics and site conditions, established test scheme, has carried out the windspeed, direction and vibration acceleration on two part of complex shaped steel structuremeasurement, obtaining the vibration acceleration data of each position of the structureduring construction.②Based on a series of wind speed spectrum and acceleration curve measured,using the MATLAB software and the method of random subspace analysis to get thefirst order vibration mode frequency of tower top steel structure in two directionshorizontal structure is0.62Hz for the data; the West stone roof and awning steelstructure of the first order modal frequency size structure in the X direction and the Zdirection is2.4Hz, and in the Y direction due to the stiffness of the structure isrelatively weaker X direction, the direction of Y is identified first order frequency size is0.92Hz.③Based on the measured data, the peak acceleration vibration response ofstructure analysis, get the structures in typhoon "Utor" landing in all directions in theprocess of structure vibration acceleration is0.059398m/s2. By looking up the national standard, the comfort standard of people can feel the vibration acceleration limit valueis0.10m/s2, after the comparative analysis can determine the hotel living comfortrequirements.④Using SAP2000software modeling and applying the wind on the time historyanalysis of properties of structural dynamic response, get the first-order naturalfrequency size structure is0.54361Hz, by comparison the natural frequencies ofstructures0.62Hz and measurement analysis, the data of obtained from fieldmeasurements structural calculation frequency vibration frequency analysis ofcorresponding to common mode type of larger than SAP2000software, and the error ofits previous modal frequency general in the10%~20%. To analyze the reason and aseries of parameters from the measured results of accurate estimation of software, Andon the structure model parameters are modified.