The Experimental Research Of Shaking Table On Earthquake Simulation Of The Suspended Mass System Structure

Although converter station construction had made rapid progress in our country in recent years, almost all the valve hall structures of main control of converter station is still designed in the foreign country, even machining and manufacturing are also completed abroad, and there is still not related item about the design of suspended mass system structure liking valve hall structure in our country. This situation is not suitable with rapid development of our country power construction and achieved level in the design field of civil engineering. In order to change this kind of situation, we must study the design of valve hall structure. Hanging large mass rectifier valve groups in roof-truss is outstanding characteristic of valve hall structure. Because of this suspended mass, bearing behavior of valve hall structure is different of common industrial workshop. Influence of seismic response about suspended valve groups and length of hanging valve groups must be studied. Based on shaking table test and finite element analysis, this paper has presented the seismic performance of the valve hall structure under different seismic intensity, which has strong theoretical meanings and practical engineering value.The main fruits of this paper are as follows:Firstly, this paper introduces model design of the earthquake simulation shaking table. According to the characteristic of the prototype and the present condition of the lab two 1/8 scale model, which include reinforced concrete shear walls-steel frame and reinforced concrete frame-steel frame structure model, is designed.Secondly, this paper introduces the shaking table test. effect of earthquake waves along direction of length side and short side of model structure is intended to simulate earthquake action along lateral and longitudinal direction of prototype structure, which study seismic performance of the. structure. Three kinds of earthquake waves from different sites are selected as applied load. Some important experimental results have been gained by the measurement including the dynamic character of the whole structure and dynamic response of acceleration, then the displacement is got by integration to acceleration, and emphatically investigates influence of suspended valve groups and length of hanging valve groups to dynamic response of the structure and cable internal forces is studied under earthquake action. White noise is input before and after each simulated earthquake. By modal analysis dynamic property is studied. Experimental results show there are weak positions in the structure.Thirdly, this paper introduces nonlinear finite element dynamic analysis. Before model making, finite element simulation analysis was carried out. Influence of suspended valve groups and length of hanging valve groups to dynamic response of the structure and cable internal forces is studied under earthquake action, and the range ability of testing instrument for testing acceleration and strain is also determined. Simulation analysis is also performed after test and the results are contrast to the experimental results. The result shows that the simulated and measured results are in good agreement, then rationality of calculation model is verified, and feasibility of test scheme and reliability of experiments are also verified.