The Experimental Research Of Shaking Table On Prestressed Concrete Frame Structure Of Bunker Bay Of Thermal Power Plant

In the bunker gay of main plant of large thermal power plant,large span is a remarkable feature,and vertical load is also rather heavy,so the whole structure is a kind of structure with strong beam and weak column.For the current thermal power plants,prestressed concrete structure style is barely adopted. In fact,this kind of structure style can dramaticly reduce sectional size ,save material and yield good economic returns. So study on aseismic performance and design method of this kind of structure has great theoretical and practical value.Earthquake simulated shaking table test and nonlinear finite element dynamic analysis have been carried out in this paper. The primary research fruits are as follows.Firstly,this paper presents the model desigh. According to the characteristic of the prototype and the present condition of the lab a 1/8 scale model is designed.Due to the limitation of the ultimate bearing capacity of shaking table,insufficiet additional weight is accepted in the model desigh based on similarity theory .And microconcrete is selected as model material.Secondly,this paper presents the shaking table test. 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 and strain of some important positions. The displacement is got by integration to acceleration. White noise is inputed before and after each simulated earthquake. By modal analysis dynamic property is studied. Experimental results show that this new structure satisfies the requirement of earthquake fortification intensity.The first floor is the weak position of the whole structure.This kind of structure is still a kind of structure with strong beam and weak column. Cracks firstly appear at the top of the frame column of the first floor and subsequently at the bottom of the frame column of the first floor.Thirdly, this paper presents nonlinear finite element dynamic analysis.Before model making, the artificial model is established and prestressing force loading is simulated. By analysis strech-draw sequence and controlling force of prestressing tendon are solved.And the range ability of testing instrument for testing acceleration and strain is also determined. The artificial analysis by choosing the actually measured acceleration data of bottom case as imput load, is also done after the experiment and the results are contrast to the experimental results.Following the same method analytic model of the prototype is esteblished. By comparison of experimental and artificial rerults,The validity of calculation model and dynamic analysis is verified. The analytic result of the prototype unit is basically accordant with the experimental results.This demonstrates that the design of test model is reasonable and reliable.