Structural optimization and application research on a curved track type isolation device
Aimed at the seismic protection requirements of free-standing objects,a curved track type isolation device based on a novel anti-lateral movement component was developed.Its structural characteristics and operation mechanism were expounded.The operation quality of the model which was made according to the structural principle was tested by experimental and theoretical comparison to verify the feasibility of the scheme.Then the prototype was designed for the cultural relics in Yuhua Pavilion,and its shaking table test was carried out by using multiple floor waves to test its isolation effect.And concomitantly,the influence of building filtering effect on the design of this isolation device was discussed.The results show that the optimized curved track type isolation device not only has clear functions of each component and a simple structure that is easy to process,but also has the advantages of strong integrity,high operation quality and structural scalability.The components of the test model can give full play to their respective functions,and especially the anti-lateral movement component greatly improves the stability and reliability of the model.Moreover,the results of theoretical analysis are in agreement with the experimental results.The prototype designed based on the case has good isolation performance,but the repeated test results are different due to its nonlinear and two-degree-of-freedom properties,which should be paid attention to in engineering application.When the floor wave is not easy to obtain and the period of the isolation device is far away from the natural vibration period of the building,according to the floor acceleration amplification coefficient,it is feasible and conservative to use amplitude-modulated seismic waves as the design basis for isolation devices.
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