调谐质量阻尼器(tuned mass damper,TMD)是一种典型有效的结构动力响应被动控制装置,工程中常用液体质量作为TMD的调谐质量。液体质量对TMD的频率、质量比均会产生较大影响,既有研究对此尚无定量的研究结论。为了解决液体晃动效应对TMD...调谐质量阻尼器(tuned mass damper,TMD)是一种典型有效的结构动力响应被动控制装置,工程中常用液体质量作为TMD的调谐质量。液体质量对TMD的频率、质量比均会产生较大影响,既有研究对此尚无定量的研究结论。为了解决液体晃动效应对TMD的影响问题,通过传统固体质量TMD与液体质量TMD振动台对比试验,讨论了液体晃动对TMD动力特性的影响。同时,通过理论与试验对比,讨论了Housner模型用于液体质量TMD设计的准确性。研究结果表明,液体晃动会提高TMD的频率15%~30%,降低其参与质量30%左右。Housner模型能准确地描述液体TMD的模态特征,但对其动力时程响应描述误差较大。展开更多
The challenge in the practical application of rocking foundations is the estimation of its performance,particularly the rotation angle,during a strong earthquake.In this study,the dynamic rocking behavior for a shallo...The challenge in the practical application of rocking foundations is the estimation of its performance,particularly the rotation angle,during a strong earthquake.In this study,the dynamic rocking behavior for a shallow foundation considering structural response was evaluated through two analytical approaches:the conventional soil-foundation-structure interaction(SFSI)governing equation of a single-degree-of-freedom(SDOF)structure on a rocking shallow foundation,and the Housner rocking model(i.e.,a rocking rigid block on a rigid base).Both approaches were validated with dynamic centrifuge tests.The test models consisted of a soft soil deposit,a shallow rectangular foundation,and an SDOF structure dominated by a bending behavior.A total of 11 foundation-structure systems and six seismic waves,including recorded earthquake signals and sinusoidal waves,were utilized.The results showed that the conventional SFSI equation well predicted the maximum rotation during strong earthquakes.However,this method was less accurate regarding the rotational phase information and maximum rotation of the foundation during weak earthquakes.On the other hand,although the modified Housner′s rocking model required five parameters relevant to a soil-foundation-structure system,it overestimated the maximum rotation of the foundation when compared with the results from dynamic centrifuge tests.展开更多
文摘调谐质量阻尼器(tuned mass damper,TMD)是一种典型有效的结构动力响应被动控制装置,工程中常用液体质量作为TMD的调谐质量。液体质量对TMD的频率、质量比均会产生较大影响,既有研究对此尚无定量的研究结论。为了解决液体晃动效应对TMD的影响问题,通过传统固体质量TMD与液体质量TMD振动台对比试验,讨论了液体晃动对TMD动力特性的影响。同时,通过理论与试验对比,讨论了Housner模型用于液体质量TMD设计的准确性。研究结果表明,液体晃动会提高TMD的频率15%~30%,降低其参与质量30%左右。Housner模型能准确地描述液体TMD的模态特征,但对其动力时程响应描述误差较大。
基金National Research Foundation of Korea(NRF)Grant funded by the Korean Government(Ministry of Science and ICT)under Grant No.2017R1A5A1014883。
文摘The challenge in the practical application of rocking foundations is the estimation of its performance,particularly the rotation angle,during a strong earthquake.In this study,the dynamic rocking behavior for a shallow foundation considering structural response was evaluated through two analytical approaches:the conventional soil-foundation-structure interaction(SFSI)governing equation of a single-degree-of-freedom(SDOF)structure on a rocking shallow foundation,and the Housner rocking model(i.e.,a rocking rigid block on a rigid base).Both approaches were validated with dynamic centrifuge tests.The test models consisted of a soft soil deposit,a shallow rectangular foundation,and an SDOF structure dominated by a bending behavior.A total of 11 foundation-structure systems and six seismic waves,including recorded earthquake signals and sinusoidal waves,were utilized.The results showed that the conventional SFSI equation well predicted the maximum rotation during strong earthquakes.However,this method was less accurate regarding the rotational phase information and maximum rotation of the foundation during weak earthquakes.On the other hand,although the modified Housner′s rocking model required five parameters relevant to a soil-foundation-structure system,it overestimated the maximum rotation of the foundation when compared with the results from dynamic centrifuge tests.
