针对浮放物体的防震保护需求,研发出一款基于新型抗侧移组件的曲线轨道式隔震装置.阐述它的构造特点和运行机制,并依据结构原理制作模型,通过试验与理论对比来检验模型的运行质量进而验证方案的可行性.然后结合雨花阁内文物来设计样机,采用多条楼面波进行样机的振动台试验,测试其隔震效果.最后探讨建筑滤波效应对该类隔震装置设计的影响.研究结果表明:曲线轨道式隔震装置经优化后不仅零部件功能清晰,结构简单易加工,而且具备整体性强、运行质量高以及后期可扩展等优势.试验模型的零部件能充分发挥各自功能,尤其是抗侧移组件极大提高了模型的稳定性和可靠性,理论分析与试验结果吻合良好.结合案例所设计的样机虽具有较好的隔震性能,但限于非线性双自由度的结构特点,重复试验的响应结果存在差异,工程应用中应予以重视.当楼面波不易获取且隔震装置周期远离建筑自振周期时,依据楼面加速度放大系数,将调幅后的原始波作为隔震装置设计依据是可行的且结果偏保守.
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.