考虑土‑结构相互作用的软钢阻尼器作用效果分析  

Efficiency Analysis of Metal Dampers Considering Soil‑structure Interaction

作　　者：杨金平 孙开心 李培振[2] 静行[1] YANG Jinping;SUN Kaixin;LI Peizhen;JING Hang(College of Civil Engineering,Henan University of Technology,Zhengzhou 450001,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]河南工业大学土木工程学院,河南郑州450001 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《防灾减灾工程学报》2023年第3期494-501,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51978524,52108134)资助。

摘　　要：为了研究土-结构相互作用(SSI)对设置金属阻尼器框架结构的影响规律,本文设计实现了考虑SSI的设置开孔式加劲阻尼器体系的框架结构振动台模型试验。试验采用层状剪切盒模拟土体的边界,锯末和砂土的混合物作为地基土,以12层钢筋混凝土框架结构模拟上部结构。基础采用3×3群桩基础。本文完成了1:6比例的高层结构—桩—土动力相互作用体系(PSSI)、设置金属阻尼器的PSSI体系以及刚性地基上框架结构和刚性地基上设置金属阻尼器的框架结构共4个模型振动台试验。从动力特性、地震响应等方面对比分析了纯框架与消能减震结构的差别。并通过计算减震率,分析了SSI效应对消能减震结构减震效果的影响规律。结果表明:消能减震结构在同样的地震作用加载下,频率衰减幅度降低为纯框架的1/3~1/2,阻尼比增加幅度为纯框架的1/2左右,结构的损伤程度明显减弱,阻尼器起到了显著的减震效果。SSI体系消能减震结构的阻尼器减震效率下降,但SSI的减震效果加强,综合来看,其减震率依然高于刚性地基结构。In this study,a shaking table model test was performed on the stiffening damper system with opening holes considering the soil-structure interaction(SSI)to investigate the efficiency of metal dampers.The layered shear box was designed to simulate the soil boundary,with a mixture of sawdust and sand serving as the foundation soil.A12-storey reinforced concrete frame structure was constructed to simulate the superstructure.The foundation was a 3×3 pile group.Four shaking table model tests were carried out,including the 1:6 scale high-rise soil-pile-structure dynamic interaction system,the same system equipped with metal dampers,the frame structure under a fixed-base condition,and the frame structure equipped with metal dampers under a fixed-base condition.The differences between the pure frame and the energy dissipation and shock absorption structures are compared with each other and are analyzed in terms of their dynamic characteristics and seismic responses.By calculating the damping rate,the influence law of SSI effect on the damping effect of the energy dissipation and damping structure is analyzed.The results show that under identical earthquake loading,the frequency attenuation of the energy dissipation structure is reduced to 1/3~1/2 of that of the pure frame,and the damping ratio is increased to about 1/2 of that of the pure frame.The damage degree of the structure is greatly mitigated,and the dampers have a significant damping effect.Although the damping efficiency of metal dampers in SSI system decreases,the damping effect of soil-structure interaction is strengthened.Generally,the damping rate of the SSI system remains higher than that of the fixed-base condition.

关 键 词：土-结构相互作用 振动台试验 金属阻尼器 软土地基 减震率 

分 类 号：TU4[建筑科学—土工工程]