TMD减震钢框架有限元分析

TMD在实际工程结构中得到了广泛的运用和认同,为了进一步验证TMD的减震控制效果,进行了TMD-钢框架有限元模型的地震时程分析。首先分析了TMD的减震原理及其参数优化设计方法,根据有限元钢框架模型的动力特性设计了TMD减震装置的参数;然后利用有限元软件SAP2000对该TMD减震钢框架进行动反应有限元仿真分析。分析结果表明：该TMD减震装置具有显著的减震效果,能够有效地减小结构地震反应峰值。     

地震作用下调频质量阻尼器减震效果试验研究

为考察地震作用下调频质量阻尼器(TMD)的减震效果,按简谐激励作用下双自由度TMD结构最优参数设计和加工了一个设置TMD减震子结构的钢框架模型,采用电磁振动台加载,对其在简谐激励和地震波作用下的动力响应规律进行了试验研究。试验结果表明:简谐激励作用下TMD的减震效果受激励频率的影响非常明显,当激励频率与结构自振频率接近时,减震效果好,远离结构自振频率时,减震效果变差,还可能会放大结构的响应;地震波作用下TMD的减震效果受到地震波频域能量分布的影响,当地震波中与主结构频率相对应分量的反应谱值位于反应谱曲线的局部极小值附近时,TMD可能会放大结构的地震响应;反之,当主结构对应反应谱值位于反应谱曲线的局部极大值附近时,减震效果非常显著。研究结果表明TMD减震技术应用于结构抗震设计时,需详细考察其减震效果的可靠性,不能仅仅依据规范要求的3组地震波作用下的结果加以设计。     

TMD对大跨钢管混凝土拱桥的减震性能研究

以某单拱肋钢管混凝土拱桥为原型,通过Midas软件对其有限元模拟并进行动力分析得到该拱桥的动力特性。根据分析结果在主拱肋顶部拟安装TMD系统,分别按照主结构无阻尼和有阻尼两种情况研究该TMD最优参数的取值。对比布置所求参数的TMD前后该拱桥主拱圈顶部在三种不同地震波作用下的位移反应,分析该TMD装置对该拱桥的减震性能。     

砌体结构TMD减震体系非线性地震反应研究

根据随机振动理论推导了多层剪切型结构TMD减震系统的随机地震响应,分析了参数的变化对TMD减振系统减震效果的影响,从而优化了取得最佳减震效果所需要的关键参数.以砖砌体结构为研究对象,建立了用于非线性地震反应的三线型骨架曲线及其滞回规律,编制了非线性地震反应分析程序,计算了一幢六层砌体结构减震前和采用TMD减震后的地震反应,分析结果表明,在7度多遇烈度和7度基本烈度地震动作用下减震效果良好,在7度罕遇烈度地震动作用下,TMD系统应通过加强构造措施保证抗震性能.     

FPS型巨型框架隔震结构分析

利用有限元程序SAP2000对FPS型巨型框架隔震结构和对应的未采用隔振装置的抗震结构进行分析对比,研究了FPS型巨型框架隔震结构的隔震效果。结果表明:FPS型巨型框架隔震结构的隔震效果明显。     

高层框架结构地震反应TMD控制研究

对顶部设有水箱的高层建筑的结构地震响应的减震方法及其可行性进行了探讨.在常规动力分析的基础上,将顶层水箱作为TMD子结构系统,以最大绝对位移及层间位移为主要控制值,研究了改变TMD系统参数对框架系统的地震响应的影响.研究结果表明,合理配置TMD系统对减小结构地震反应是可行的,在土木工程中具有广泛应用前景.     

FPS型TMD控震效应分析

基于FPS(FrictionPendulumSystem)型TMD(TurnedMassDamper)控制的多层剪切型结构振动微分方程 ,通过时程计算分析了FPS型TMD控震响应规律。结果表明 ,合理设计的FPS型TMD控振系统可以改善结构的振动响应     

地震作用下复阻尼调频质量阻尼器减震结构优化设计

分析了简谐激励和平稳随机激励条件下,复阻尼调频质量阻尼器(TMD)和主结构的二自由度减震结构体系的稳态地震响应,建立了动力学平衡方程,推导了复阻尼TMD的阻尼和频率最优参数的理论公式,并分析了该二自由度减震结构体系在多条地震波作用下的减震效果,对比了复阻尼TMD和粘滞阻尼TMD减震效果的差异,结果表明:复阻尼TMD的减震效果接近于粘滞阻尼TMD的结果,在应用TMD减震技术时,复阻尼TMD也是一种选择。     

基于钢弹簧装置的隔振减震结构设计方法

针对目前钢弹簧隔振减震装置在结构设计过程中在实用性和最优性上的不足,研究在对钢弹簧隔振减震装置试验研究和数值模拟研究的基础上,提出一种实用有效的钢弹簧装置隔振减震结构设计方法,该方法可以对装置竖向和水平向参数进行设计,以满足竖向隔振和水平向减震的控制要求,通过对四合院工程案例的隔振减震结构设计,验证设计方法的合理性。研究成果可为钢弹簧隔振减震装置在结构振动控制设计应用提供参考和指导。     

调谐质量阻尼器结构减震性能及影响因素研究

通过建立两个自由度结构的动力方程,推导其频率传递函数,并讨论主结构、调谐质量阻尼器(TMD)及外激励荷载三者频率的关系得到TMD的减震机理,其机理是在TMD与主结构的相对运动中由TMD对主结构施加方向作用力抑制其振动并利用阻尼器阻尼进行耗能。通过定义其动力放大系数,利用数值模拟研究主次结构的频率及阻尼比、次结构与主结构的质量比等动力参数对结构减震性能的影响。最后,利用有限元软件对一个12层的框架模型进行分析,对数值分析所得结论进行验证,二者得到基本一致的结论,并对误差进行分析。     

地震作用下多层砖混结构TMD控制及其应用研究

在结构地震反应时程分析基础上,对地震作用下多层砖混结构TMD控制优化设计方法进行了初步探讨;给出了地震作用下多层砖混结构TMD控制优化设计步骤。并用算例验证了该设计方法用于地震反应控制的可行性。     

Parametric control of structural responses using an optimal passive tuned mass damper under stationary Gaussian white noise excitations

In this study, the structural control strategy utilizing a passive tuned mass damper (TMD) system as a seismic damping device is outlined, highlighting the parametric optimization approach for displacement and acceleration control. The theory of stationary random processes and complex frequency response functions are explained and adopted. For the vibration control of an undamped structure, the optimal parameters of a TMD, such as the optimal tuning frequency and optimal damping ratio, to stationary Gaussian white noise acceleration are investigated by using a parametric optimization procedure. For damped structures, a numerical searching technique is used to obtain the optimal parameters of the TMD, and then the explicit formulae for these optimal parameters are derived through a sequence of curve-fitting schemes. Using these specified optimal parameters, several different controlled responses are examined, and then the displacement and acceleration based control effectiveness indices of the TMD are examined from the view point of RMS values. From the viewpoint of the RMS values of displacement and acceleration, the optimal TMDs adopted in this study shows clear performance improvements for the simplified model examined, and this means that the effective optimization of the TMD has a good potential as a customized target response-based structural strategy.     

Optimizing parameters of tuned mass damper subjected to critical earthquake

Tuned mass damper (TMD) has been proposed as one of the vibration control methods for rehabilitation of buildings. Because the parameters of TMD can significantly affect the seismic performance of structures, many researches focused on finding the optimum parameters. Because earthquakes are random phenomena and future earthquakes in comparison with past earthquakes may be more destructive, the optimum design of TMD subjected to selected earthquakes can be nonconservative. Hence, the main contribution of this paper is to present the optimal design of TMD for the seismic vibration control of a structure subjected to a critical earthquake that produces the most severe response of a structure. In order to achieve this purpose, the parameters of TMD are optimized through minimizing the maximum displacement of the roof. First, three optimization methods are used to obtain the optimal parameters of TMD for a 10‐story shear building subjected to the critical earthquakes. Finally, the responses of the controlled and uncontrolled buildings such as the roof displacement, strokes, transfer function, and different forms of energy are compared. Results show that the optimum designs of TMD not only effectively reduce the roof displacement but also improve the seismic performance of the building.     

Aseismic smart building isolation systems under multi-level earthquake excitations: Part I,conceptual design and nonlinear analysis

As a novel structural control strategy, tuned mass damper (TMD) inspired passive and semi-active smart building isolation systems are suggested to reduce structural response and thus mitigate structural damage due to earthquake excitations. The isolated structure’s upper stories can be utilized as a large scaled TMD, and the isolation layer, as a core design point, between the separated upper and lower stories entails the insertion of rubber bearings and (i) viscous dampers (passive) or (ii) resettable devices (semi-active). The seismic performance of the suggested isolation systems are investigated for 12-story reinforced concrete moment resisting frames modeled as “10+ 2” stories and “8+ 4” stories. Passive viscous damper or semi-active resettable devices are parametrically evaluated through the optimal design principle of a large mass ratio TMD. Statistical performance metrics are presented for 30 earthquake records from the three suites of the SAC project. Based on nonlinear structural models, including P-delta effects and modified Takeda hysteresis, the inelastic time history analyses are conducted to compute the seismic performances across a wide range of seismic hazard intensities. Results show that semi-active smart building isolation systems can effectively manage seismic response for multi-degree-of freedom (MDOF) systems across a broader range of ground motions in comparison to uncontrolled case and passive solution.     

Parametric study of the use and optimization of tuned mass dampers to control the wind‐ and seismic‐induced responses of a slender monument

Passive energy dissipation devices have been used around the world to mitigate the response of structures under dynamic excitations, such as wind or seismic loading. The use of tuned mass dampers (TMD) in tall and slender buildings to reduce unwanted responses has proved to be very effective. The main purpose of this work is to study the structural behavior of a 115‐m‐height slender monument fitted with TMDs subjected to simulated wind and seismic loading. Turbulent wind forces were calculated based on samples of turbulent wind speed simulated with an auto regressive and moving average (ARMA) model. Ground motions compatible with a seismic site spectrum were also simulated. An optimization approach is suggested to determine the parameters of the TMDs that reduce the structural response to the maximum. The effectiveness of the TMDs for reducing the structural response of the monument is discussed in detail, and the use of optimally tuned TMDs is emphasized.     

利用屋顶隔热层减小多层房屋结构地震反应设计

在结构控制理论研究成果基础上,提出了利用多层房屋结构屋顶隔热层作为TMD装置系统来达到减震的目的;进一步对屋顶隔热层作为减震装置的构造设计。并用仿真算例验证屋顶隔热层作为减震装置系统设计的可行性和实用性。     

Seismic damage and fragility analysis of structures with tuned mass dampers based on plastic energy

The effectiveness of using a tuned mass damper (TMD) to improve a structure's ability to dissipate earthquake input energy is investigated through the use of seismic fragility curves. The nonlinear material behaviour of the structure is captured using the force analogy method, the backbone for analytically quantifying plastic energy dissipation in the structure. Numerical analysis was performed to study the global response and local energy dissipation of a six‐storey moment‐resisting steel frame with and without a TMD installed for 100 simulated non‐stationary Gaussian earthquake ground motions. The effectiveness of the TMD, based on reduction of seismic responses and enhancement of the seismic fragility, is considered at structural performance levels for immediate occupancy and life safety as identified in FEMA 440. An ‘equivalent monotonic plastic strain’ approach—a local measure of structural damage—is used to correlate the seismic fragilities at different global performance levels based on storey drift. Results illustrate that a TMD can enhance the structure's ability to dissipate energy at low levels of earthquake shaking, while less effective during moderate to strong earthquakes, which can cause a significant period shift associated with major structural damage. This ‘de‐tuning’ effect suggests that an extremely sizable TMD is not effective in reducing damage of a structure. Published in 2010 by John Wiley & Sons, Ltd.