Research And Development Of Utility Technique On Sliding Base Isolation System

Sliding base isolation by friction, a isolation which is tried early. However, because of some defect, it is not yet generalized. And, the friction model that is important in sliding base isolation system is expressed by discontinuous or imperfectly continuous function. Moreover, the software or program is scarce, which brings some difficulty to calculation and analyze. The simple calculating methods are needed in factual projects. In the paper, some problems are researched, contents including:Firstly, history and application of isolation technique is stated, the working principle of isolation system and types of isolation technique is analyzed, nowadays key problems in sliding isolation are showed, corroding to the problems which are faced now days, main contents researched in the paper are determined .Secondly, a new multiple isolation equipment—hydraulic jack and friction sliding system are combined. And, considering following aspects of it, working principle, improvement method, bearing capacity, self-collapse, installation in construction and wind resistance, feasibility of hydraulic jack are studied.Thirdly, the simple model of single-degree-of-freedom and multiple-degree-of-freedom sliding base isolation are built, according to basic hypothesis, and vibration equations are deduced. Tow motion states of the system are defined, characteristic of which is analyzed. And then, frequency characteristic and dumping characteristic are analyzed corroding to general condition, influence of isolation layer rigid on them is studied. About the methods for analyzing isolation system, third immediate integration methods are principally deduced. The ordinary friction models are analyzed, completely continuous model is come true by way of improving continuous explosion friction model. Then, based on "Code for seismic design of buildings" and the methods for simulating artificial seismic wave, the program for simulating artificial earthquake wave is finished. The program for calculating and analyzing sliding isolation system is completed by introducing MatrixVB function library, which enhances the graphics function of the program and offers favorable user interface, and it is very practicable. And, the feasibility of program is proved by calculating an example.Moreover, based on available mode superposition method and elementary sliding base-isolated system, mode superposition method is applied to sliding isolation, and, mode response spectrum method is studied for simplifying calculation.Finally, conclusion is made, and problems facing us are put forward.