The Research On Optimal Seismic Response Instrumentation For High-rise Building

In recent years, with the rapid development of economy, a great deal of high-rise buildings and skyscrapers have been build and applied. Since these tall buildings are complex in bodily form of architecture and plane lay and lack of seismic disaster experience and sufficient design basis, more research is also required. Seismic response instrumentation is placed in these buildings so that it is easy to get the response records and erect calculating models of structures properly. Not only can it supply help for aseismatic code modification in these uniform structures, but also it can promote the development of high-rise building design theory. So it is meaningful and necessary to place strong seismic response instrumentation in the high-rise building.Firstly, this paper studies three methods of optimal sensor placement: the cumulative improved method based on QR decompose of main column, the reduced method based on QR decompose of main column and the general genetic algorithm based on dualistic coding. For comparing these methods easily, the uniform optimal principle, Modal Assurance Criterion (MAC), is adopted. Among the three methods, the general genetic algorithm is global optimal and the others are partial optimal. Programs of those methods, which are programmed by the large calculating software MATLAB, are viewable and convenient for operation and use.Then, based on analyzing existed papers, it emphatically studies the concerned problems when placing seismic response instrumentation in the high-rise building and presents some optimal principles which are applicable to those structures. Choosing free-field site, selecting the floors and confirming channel numbers are discussed usually when placing seismic response instrumentation. Choose the places where are apart 1/2～1/3 earthquake wave-length from structures and about 1.5～2 times height of structures to deploy free-field site. Calculate the program and choose the final floors in view of the places of equipment floors and refuge floors. Tri-axial sensors are installed on the free-field site for recording the earthquake ground motion inputs of structure. For the selected floor, tri-axial sensors are placed on geometrical centers. Both horizontal channels are used to record translations and vertical channel to record vertical vibration. On the two sides of the same floor, two twi-axial sensors are placed symmetrically, the two channels paralleling to the walls are used to analyze torsion and the vis-à-vis channels to analyze deformation of the floor. At last, take the seismic response instrumentation of Dalian International Trade Center as a practice. First of all, model the structure and analyze its modal character; Then, calculate the calculating programs of three methods and give three different placement schemes considering the optimal principle; At last, the best placement schemes is given after comparing and analyzing them.