Study On Modal Parameter Identification Of Super-Tall Buildings Under Strong Wind And The Development Of Database Management System For Full-Scale Measurement

Nowadays, with the development of economy and technology, there is an upsurge in the construction of super high-rise building around the world. Under this circumstance, the security of the high-rise building has caused wide spread concern. Studies have shown that wind loads is the controlling factor in the structural design process, and full-scale measurement and the wind tunnel test are two most important approaches for the structural wind-resistant study. The former is recognized to be the most reliable method to obtain high-rise building wind loads and wind effects. Thus, it is of great interest and necessary to obtain the modal properties of tall buildings under strong wind through full-scale monitoring, analyze their dynamic properties and then compare the field survey results with the wind tunnel experiments. This paper presents selected results from modal analysis of simulation signals, a combined wind tunnel and full-scale study of wind effects on the super-tall building, and the development of database management system for field survey:1. Based on the Bayesian spectral approach, the modified Bayesian spectral approach is developed, which allows the identification of colored noise excitations. The proposed method is applied to modal identification of simulated data. The results show that the MBSDA has a higher accuracy than conventional BSDA and RDT.2. Modal parameters of Shenzhen Kingkey 100(KK100) tower and Zhuoyue Century Center(ZCC) are identified using the full-scale measured data under four strong wind events in the recent five years. Meanwhile, wind tunnel experiment for ZCC is conducted through force base balance model test to compare the results with field survey. Result shows that the values of natural frequencies under different conditions are very close and smaller than the results of FEM; the identified damping ratios show a great dispersion and do not appear to have an obvious nonlinear relationship with vibration amplitude; there are difference between the PSD values of model tests and full-scale measurements; in the wind tunnel test and full-scale measurement, within the high reduced frequency range, the absolute value of the slope of PSD in the along wind direction is larger than that in the cross wind direction; the field measurements of acceleration data are roughly consistent with those obtained in the force balance model study, illustrating that the wind tunnel tests can provide satisfactory predictions of wind-induced vibrations of the super tall building under typhoon conditions.3. With the usage of Visual Basic and Microsoft Access, a relational database is achieved by the association of database table and view. Statisitcs and relevant charts are also accomplished by Matlab. The system is conducted to realize multiple functions such as data addition, delete, modification and the generation of relevant charts.