The Shaking Table Test Of The Structure-equipment Coupled System For The Earthquake Response

There are many dynamic equipments such as steam turbines, compressors, crushersand generators in industrial buildings. These devices are usually simplified to gatherloads heapheap load is applied to the seismic gather in the structure calculation in thetraditional concept of seismic design. In fact, the complex dynamic interaction existsbetween structure and equipment, such interactions will affect the dynamic response ofthe structure. Therefore, it is necessary structures and equipment be regarded as coupledsystem for seismic calculations.Six space models are designed and analyzed by ABAQUS to contrast thedifference of frame plant response and equipment response when the equipment isconsidered to lump mass and single freedom system. Numerical results show that thereis significant difference of the frequency and relative displacement of coupled systemand lump mass system. The relative displacement of coupled system is greater thanlump mass system, the smaller mass ratio and frequency ratio, the less the relative gapis.Three equipment symmetrical arrangement of coupled system space models aremade and tested by shaking table, which is based on the background of the industrialoperation platform. The structure system is reinforced concrete frame structure andequipment system is steel SDOF oscillator. El-Centro wave, Taft wave and Lan-zhouartificial seismic waves are chosed as seismic input in the test. The peak of accelerationlevel increases by a small amount of grading increments. The dynamic characteristics,seismic response of structure-equipment coupled system under different seismicacceleration conditions. The dynamic characteristics, displacement response, dynamicmagnification coefficient, dynamic strain and hysteretic energy of coupled system are analyzed when changing the mass ratio and frequency ratio of structure and equipment.The results showed that: different mass ratio and frequency ratio may affect the failureprocess and failure mode of structure; In the case of the frequency ratio unchanged, themass ratio increases, the relative displacement and dynamic amplification coefficient ofstructural platform are also increased. During the structure is in yield stage, the relativedisplacement of structural platform is increased by26.6%and relative displacementreaction of the equipment is reduced by about10%when the mass ratio is increasedfrom5%to10%. In the case of the mass ratio unchanged, the frequency ratio decreases,the relative displacement and dynamic amplification coefficient of structural platformare also reduced. But the frequency ratio decreases, the relative displacement of theequipment becomes larger and variation of the amplification coefficient of equipment isnot obvious.During the structure is in yield stage, the relative displacement of structuralplatform is decreased by25.7%and relative displacement reaction of the equipment isincreased by about10%when the frequency ratio is decreased from11to6.Finally, air compressor is treated as engineering example. Three kinds of framefoundation are designed, which have different mass ratio and frequency ratio. Optimalfoundation program are selected based on the results of numerical analysis andexperimental research conclusions, and numerical calculations and comparative analysiswas made in order to verify the correctness of the conclusion of this article.