考虑土-结相互作用的黏滞阻尼器减震结构振动台试验研究

发布时间：2018-02-01 17:02

本文关键词： 黏滞阻尼器土-结构相互作用振动台试验动力特性地震反应　出处：《振动与冲击》2017年13期 　论文类型：期刊论文

【摘要】：通过对黏滞阻尼器消能减震钢框架结构模型在刚性地基和群桩地基条件下进行对比振动台试验,研究土-结动力相互作用(SSI)对阻尼器减震效果的影响。根据量纲分析法确定了试验模型与原型的相似关系。采用粉质黏土作为试验用土,采用叠层剪切型土箱以减轻边界的影响。上部结构为5层钢框架,消能元件为黏滞阻尼器。通过振动台试验获取了不同地震输入下减震结构及非减震结构在不同基础条件下的动力特性、楼层加速度及位移的地震反应数据。对于桩基础模型,测量了桩身应变及桩土接触面的压力值。试验结果表明:对于非减震结构,SSI效应使结构体系的阻尼比有较大的提高,而对于减震结构,SSI效应对结构体系的阻尼比影响则不大;SSI效应对结构楼层加速度反应具有显著的影响,其对上部结构地震反应的主要影响体现为减震效应,且随着地震输入量级的增大,减震效应愈大,群桩基础上阻尼器的减震效率与刚性地基相比具有较大程度的下降;对于桩基础结构,阻尼器在降低上部结构反应的同时,减小了桩基础的地震反应,上部结构和基础两个方面的安全性都得到了提高。
[Abstract]:A comparative shaking table test was carried out on the model of the steel frame structure with viscous dampers under the conditions of rigid foundation and pile group foundation. The influence of soil-junction dynamic interaction (SSI) on the damping effect of dampers was studied. The similarity between the test model and the prototype was determined by dimensional analysis. Silty clay was used as test soil. The laminated shear soil box is used to reduce the influence of the boundary. The superstructure is a five-story steel frame. The energy dissipation element is a viscous damper. The dynamic characteristics of the damping structure and the non-damping structure under different earthquake input are obtained by shaking table test. Seismic response data of floor acceleration and displacement. For pile foundation model, the strain of pile and the pressure of pile-soil interface are measured. The damping ratio of the structure system is greatly improved by SSI effect, but the damping ratio of the structure system is not affected by the SSI effect. The SSI effect has a significant effect on the structural floor acceleration response, and the main effect on the seismic response of the superstructure is the shock absorption effect, and with the increase of the magnitude of earthquake input, the greater the damping effect is. Compared with the rigid foundation, the damping efficiency of the dampers on the pile group foundation is much lower than that of the rigid foundation. For pile foundation structure, the damper reduces the response of the superstructure and the seismic response of the pile foundation. The safety of the superstructure and foundation is improved.
【作者单位】：南京工业大学土木工程学院;
【基金】：国家自然科学基金重大研究计划(90815017) 土木工程防灾国家重点试验室开放课题基金(SLDRCE10-MB-06)
【分类号】：TU352.1
【正文快照】： 由于地震发生的偶然性和突然性,人们往往难以得到地震时的有效原型观测数据。因此,在进行土-结构动力相互作用(Soil-Structure Interaction,SSI)研究中最大的困难是缺少地震时土-结构体系地震反应的实测数据;同时,土-结构相互作用体系模型的动力试验也很少,现有的计算模型和

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