共查询到19条相似文献，搜索用时 218 毫秒
1.
常摩擦TMD地震控制效果的理论和实验研究 总被引：2，自引：0，他引：2
在TMD中采用摩擦阻尼代替传统的粘滞阻尼,可有效降低TMD的造价,从而促进其推广应用。但摩擦元件是非线性的,给摩擦TMD分析和设计造成了一定的困难。为了研究常摩擦TMD地震控制的特点和规律,文中采用时程分析法进行了简谐激励和地震激励下摩擦TMD对单自由度结构响应控制的理论分析;在理论分析结果的指导下,进行了单自由度主结构和摩擦TMD系统在简谐激励和地震激励下的振动台试验。理论分析和试验结果表明:除了频率比和质量比的影响,摩擦TMD的控制效果和摩擦力大小、激励幅值有关,只要参数设置合适,其控制效果是令人满意的;在设计摩擦TMD时要针对激励大小、目标控制效率进行具体分析。 相似文献
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带TMD的结构基于动力可靠性约束的优化设计 总被引：4，自引：0，他引：4
本文在运用复模态法求得多自由度带TMD结构随机地震响应解析解的基础上．采用基于动力可靠性约束的优化设计方法对TMD装置参数的优化取值进行了系统研究,以结构最大位移响应的期望值为目标函数,以TMD装置响应的动力可靠性为约束条件,运用罚函数法获得到TMD装置的优化设计参数．并给出了算例,从而建立了带TMD结构基于动力可靠性约束的抗震优化设计的一整套方法,本文方法也可用于基础隔震结构、带TLD减震结构以及带TMD和TLD抗风结构的优化设计。 相似文献
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本文对多自由度基础平动结构随机地震响应问题进行了系统研究。针对用第1振型近似代表上部结构所得方程为非经典阻尼和非对称结构情况。用复模态法解耦。获得了以第1振型表示的结构地震响应的解析解。对单自由度体系。此解即为结构响应的精确解。本文方法也可用于带TMD减震结构等的随机地震响应分析与优化设计。 相似文献
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基础隔震结构随机地震响应分析的复模态法 总被引：13，自引：1，他引：13
本文对多自由度基础隔震结构的随机地震响应问题进行了系统研究，首先建立了运动方程，然后用第一振型将上部结构展开，针对所得方程为非经典阻尼、非对称质量和非对称刚度情况，用复模态法解耦，获得了以第一振型表示的结构地震响应的解析解，对单自由度体系，此解即为结构响应的精确解，从而建立了两自由度体系在任意非经典阻尼与非对称质量和刚度情况下随机地震响应解析解分析的一般方法。本文方法也可用于带TMD减震结构、无损伤“加层减震”加固结构的随机地震响应分析与优化设计。 相似文献
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基础隔震技术广泛应用于建筑结构以减轻结构的地震响应.值得注意的是,在隔震体系中减小主结构的加速度响应是以牺牲隔震器变形为代价的.调谐惯容系统(TID)和隔震器组成的混合隔震体系可减小隔震层的位移响应.与传统调谐质量阻尼器(TMD)结构类似,TID 由惯容、调谐弹簧和阻尼元件组成.因此,可直接利用 TMD减震系统的设计公式来确定 TID 的最优参数.首先基于单自由度体系(SDOF)附加 TID的运动方程,推导分析两种 TID和 TMD设计公式,对两者设计公式的前提条件和适用性进行深入的探讨.其后,借助基础隔震体系的benchmark模型来检验设计 TID的可行性和有效性.数值模拟结果表明,在不增加主结构绝对加速度响应的情况下, TID能够显著减小基础隔震结构的位移响应和基底剪力. 相似文献
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MTMD对建筑结构多模态控制的减震分析 总被引：5，自引：1，他引：5
本文研究了MTMD对建筑结构多模态减震控制。将主结构简化为多自由度模型，MTMD对结构的反力与地震荷载共同作为结构的荷载输入进行分析；基于主结构多模态耦合进行推导分析，阐述了MTMD与结构之间的相互作用关系，提出MTMD的复惯性质量。提出MTMD的控制类型是加速度相关型的无源被动控制。从频域传递函数，白噪声、宽带和窄带地震激励下的结构相对位移和绝对加速度谱密度，以及El-centro地震波作用下结构的地震响应三个方面，分析了MTMD对顶部带有结构附属物的结构的控制效果。并且给出TMD的控制效果加以比较验证。算例说明MTMD多模态控制对结构的相对位移和绝对加速度均有较好的控制效果，并且优于TMD控制效果。 相似文献
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关于结构系统地震输入模式问题的讨论 总被引：4，自引：2，他引：2
通过具有不同自振频率的单自由度系统地震响应的数值计算,讨论了基于运动学和动力学关系所形成的不同地震动时程输入模式对计算结构地震响应的影响.数值结果表明,不同地震输入模式对计算结构地震响应是有较大的影响,要慎重应用地震位移输入模式. 相似文献
10.
《华南地震》2018,(4)
研究长周期地震动对广州塔TMD体系的影响及结构响应的时频分布规律。对国内现行规范反应谱长周期段进行延长,选取7条地震动时程记录,并补充7条长周期地震动时程记录作为输入样本,研究不同周期的强震激励对超高耸结构TMD体系的影响。研究表明,长周期成分的地震激励显著增加了超高耸结构的响应,卓越周期在2.341 s至6.425 s的长周期地震动输入,比卓越周期低于1 s的短周期地震动输入,平均使结构桅杆顶的位移峰值与均方根值分别放大125.49%和91.63%;最优参数设计的TMD对短周期、长周期地震响应均起减震控制作用,对8度长周期大震下主塔顶和桅杆顶的位移峰值控制降幅分别达到28.61%和42.69%,对相应的位移时程响应均方根值的控制降幅分别达到32.56%和44.20%, TMD体系的减震控制性能对地震动卓越周期具有一定鲁棒性;对结构弱轴向的地震响应时程进行数值小波功率谱分析,结果表明:由于一般长周期地震动的卓越周期更接近广州塔结构弱轴向的二阶周期(2.888 s),不仅增加了一阶振型的响应,更显著加剧了以二阶振型为主的桅杆鞭梢效应, TMD对该效应一定程度上起了抑制作用;建议对周期大于6 s的超高耸结构TMD体系,在按规范反应谱选取地震动之外,应注意考虑长周期地震动的影响,以更全面评估结构性能。 相似文献
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A new type of velocity adjustable tuned mass damper (TMD) consisting of impulse generators and clutches is presented. The force impulse is generated by a joining operation of electromagnets and springs and MR dampers are used as clutches. Rules for velocity adjustment are established according to the working mechanism of TMD. The analysis program is developed on a VB platform. Seismic response of SDOF structures with both passive TMD and velocity adjustable TMD are analyzed. The results show that (1) the control effectiveness of passive TMDs is usually unstable; (2) the control effectiveness of the proposed semi-active TMDs is much better than passive TMDs under typical seismic ground motions; and (3) unlike the passive TMD system, the proposed velocity adjustable TMDs exhibit good control effectiveness even when the primary structure performance becomes inelastic during severe earthquakes. 相似文献
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提出了采用质量调谐减震控制技术对厂房结构进行减震控制的方法。利用屋盖系统作为附加质量,屋盖支座采用夹层橡胶隔震垫,建立了厂房-TMD系统模型,并用非线性时程分析法对其进行了多种地震动激励下的计算分析,探讨了厂房-TMD减震体系减震效果的参数影响及减震机理。结果表明,采用质量调谐减震技术对单层工业厂房进行减震是一种有效的方法。 相似文献
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虽然建筑施工周期内地震致险概率并不高,但是由于塔吊使用极其广泛,塔吊致险概率并不低于建筑结构,故而针对塔吊的减震措施亟需研究。本文以某实际超高层建筑施工使用的动臂式塔吊为研究对象,根据塔吊自身和附着于超高层建筑后的动力特性,研究了TMD装置的不同方案对塔吊地震响应的控制效果。结果表明:① TMD装置对于属于高耸结构的塔吊减震控制非常有效;② 设置在塔身顶部的双向TMD不仅可以有效减小塔身偏摆,也可以间接有效地控制起重臂的竖向振动;③ 由于超高层建筑-塔吊结构高阶振型影响明显,此TMD装置对塔吊塔身控制效果不稳定,但对于起重臂仍能起到良好的控制作用,故而此TMD装置可以使用在附着在超高层建筑上的施工塔吊,对于塔身的振动控制仍需进一步研究。 相似文献
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This paper presents how soil–structure interaction affects the seismic performance of Tuned Mass Dampers (TMD) when installed on flexibly based structures. Previous studies on this subject have led to inconsistent conclusions since the soil and structure models employed considerably differ from each other. A generic frequency-independent model is used in this paper to represent a general soil–structure system, whose parameters cover a wide spectrum of soil and structural characteristics. The model structure is subjected to a stationary random excitation and the root-mean-square responses of engineering interest are used to measure the TMD's performance. Extensive parametric studies have shown that strong soil–structure interaction significantly defeats the seismic effectiveness of TMD systems. As the soil shear wave velocity decreases, TMD systems become less effective in reducing the maximum response of structures. For a structure resting on soft soil, the TMD system can hardly reduce the structural seismic response due to the high damping characteristics of soil–structure systems. The model structure is further subjected to the NS component of the 1940 El Centro, California earthquake to confirm the TMD's performance in a more realistic environment. Copyright © 1999 John Wiley & Sons Ltd. 相似文献
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高层建筑地震反应全反馈主动TMD控制理论研究 总被引：6，自引：2，他引：6
本文应用最近提出的全反馈主动控制法对高层建筑地震反应进行了全反馈主动ＴＭＤ（调谐质量阻尼器）控制的理论研究，考虑了实时控制过程中控制力的时间滞后效应，并通过数值模拟分析了不同的反馈形式以及不同的时间滞后量对主动ＴＭＤ控制效果的影响。最后得出结论：对高层建筑地震反应实施全反馈主动ＴＭＤ控制，既能更有效地降低结构的位移反应和速度反应，又能大幅度地降低结构的加速度反应；且当控制力时间滞后量较大时，对主动 相似文献
16.
大跨度结构TMD减震系统多点激励的地震随机响应分析 总被引：2，自引：1，他引：2
众多研究表明，对大跨度结构进行抗震分析时，必须采用非一致地震激励模型。本文对带TMD系统的大跨度结构考虑地震行波效应后的随机地震响应问题进行了研究。文中建立了结构的动力方程，并利用虚拟激励法求解。研究结果表明，对于大跨度结构装设TMD子结构以后可显著地降低结构的位移、速度和加速度响应，但在设计TMD减震系统时，必须考虑到地震激励的非一致性，否则可能会使预期的减震效果失效。 相似文献
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This paper investigates the dynamic behavior and the seismic effectiveness of a non‐conventional Tuned Mass Damper (TMD) with large mass ratio. Compared with conventional TMD, the device mass is increased up to be comparable with the mass of the structure to be protected, aiming at a better control performance. In order to avoid the introduction of an excessive additional weight, masses already present on the structure are converted into tuned masses, retaining structural or architectural functions beyond the mere control function. A reduced order model is introduced for design purposes and the optimal design of a large mass ratio TMD for seismic applications is then formulated. The design method is specifically developed to implement High‐Damping Rubber Bearings (HDRB) to connect the device mass to the main structure, taking advantage of combining stiffness and noticeable damping characteristics. Ground acceleration is modeled as a Gaussian random process with white noise power spectral density. A numerical searching technique is used to obtain the optimal design parameter, the frequency ratio alpha, which minimizes the root‐mean‐square displacement response of the main structure. The study finally comprises shaking table tests on a 1:5 scale model under a wide selection of accelerograms, both artificial and natural, to assess the seismic effectiveness of the proposed large mass ratio TMD. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
18.
The optimal design and effectiveness of three control systems, tuned viscous mass damper(TVMD), tuned inerter damper(TID) and tuned mass damper(TMD), on mitigating the seismic responses of base isolated structures, were systematically studied. First, the seismic responses of the base isolated structure with each control system under white noise excitation were obtained. Then, the structural parameter optimizations of the TVMD, TID and TMD were conducted by using three different objectives. The results show that the three control systems were all effective in minimizing the root mean square value of seismic responses, including the base shear of the BIS, the absolute acceleration of structural SDOF, and the relative displacement between the base isolation floor and the foundation. Finally, considering the superstructure as a structural MDOF, a series of time history analyses were performed to investigate the effectiveness and activation sensitivity of the three control systems under far field and near fault seismic excitations. The results show that the effectiveness of TID and TMD with optimized parameters on mitigating the seismic responses of base isolated structures increased as the mass ratio increases, and the effectiveness of TID was always better than TMD with the same mass ratio. The TVMD with a lower mass ratio was more efficient in reducing the seismic response than the TID and TMD. Furthermore, the TVMD, when compared with TMD and TID, had better activation sensitivity and a smaller stroke. 相似文献
19.
Lifecycle cost optimization of tuned mass dampers for the seismic improvement of inelastic structures 
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下载免费PDF全文 Emiliano Matta 《地震工程与结构动力学》2018,47(3):714-737
The seismic performance of tuned mass dampers (TMDs) on structures undergoing inelastic deformations may largely depend on the ground motion intensity. By estimating the impact of each seismic intensity on the overall cost of future seismic damages, lifecycle cost (LCC) proves a rational metric for evaluating the benefits of TMDs on inelastic structures. However, no incorporation of this metric into an optimization framework is reported yet. This paper presents a methodology for the LCC‐optimal design of TMDs on inelastic structures, which minimizes the total seismic LCC of the combined building‐TMD system. Its distinctive features are the assumption of a mass‐proportional TMD cost model, the adoption of an iterative suboptimization procedure, and the initialization of the TMD frequency and damping ratios according to a conventional linear TMD design technique. The methodology is applied to the seismic improvement of the SAC‐LA benchmark buildings, taken as representative of standard steel moment‐resisting frame office buildings in LA, California. Results show that, despite their limited performance at the highest intensity levels, LCC‐optimal TMDs considerably reduce the total LCC, to an extent that depends on both the building vulnerability and the TMD unit cost. They systematically present large mass ratios (around 10%) and frequency and damping ratios close to their respective linearly designed optima. Simulations reveal the effectiveness of the proposed design methodology and the importance of adopting a nonlinear model to correctly evaluate the cost‐effectiveness of TMDs on ordinary structures in highly seismic areas. 相似文献