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1.
变阻尼半主动结构控制振动台试验 总被引：5，自引：1，他引：4
在一个１：４的五层模型刚架结构上进行了变阻尼半主动结构控制振动台试验．在结构的底层安装了一个溢流阀式变阻尼控制器,输入几种不同的地震动并采用几种不同的控制算法对结构进行了变阻尼半主动控制。振动台试验结果表明,受阻尼半主动结构控制仅需要很少的电能,就可以达到较好的控制效果,是一种很有应用前景的结构振动控制方案。结合溢流阀式变阻尼控制器的特点,分析了一些因素对控制效果的影响． 相似文献
2.
对不同控制策略下安装有复合MR(磁流变)阻尼器的模型结构进行了振动台试验研究.在El Centro地震动激励下,基于线性二次高斯(LQG)和广义预测(GP)两种控制算法,针对半主动控制系统、MR阻尼器以恒定电流(-0.5A(Passive-on 1)、0A(Passive-off)、2A(Passive-on 2)的控制系统,以及由半主动控制方式和基础隔震组合而成的混合控制系统,在WINCON/SIMULINK实时控制软件平台下对一个1:4的三层钢框架模型进行了地震模拟振动台试验.试验结果表明:基于复合MR阻尼器的控制系统是有效的,无论是被动控制、半主动控制还是混合控制,都显著降低了模型结构各层的加速度、位移响应;复合MR阻尼器在不通入电流时具有一定的被动控制效果;采用考虑时滞自补偿的广义预测控制效果要好于LQG控制,并且这两种控制策略的都能以较被动控制小的控制力达到较好的控制效果. 相似文献
3.
一种新型混合控制技术的振动台模型试验研究 总被引：1，自引：1，他引：0
本文提出了基底隔震和上部结构变刚度／阻尼半主动控制结合的一种新型混合控制型式,并且通过小型电磁振动台模型试验来研究其控制效能,为其今后更进一步理论和实验研究奠定基础。 相似文献
4.
Pounding between adjacent superstructures has been a major cause of highway bridge damage in the past several earthquakes. This paper presents an experimental and analytical study on pounding reduction of highway bridges subjected to earthquake ground motions by using magnetorheological (MR) dampers. An analytical model, which incorporates structural pounding and MR dampers, is developed. A series of shaking table tests on a 1:20 scaled base‐isolated bridge model are performed to investigate the effects of pounding between adjacent superstructures on the dynamics of the structures. Based on the test results, the parameters of the linear and the nonlinear viscoelastic impact models are identified. Performance of the semiactive system for reducing structural pounding is also investigated experimentally, in which the MR dampers are used in conjunction with the proposed control strategy, to verify the effectiveness of the MR dampers. Structural responses are also simulated by using the established analytical model and compared with the shaking table test results. The results show that pounding between adjacent superstructures of the highway bridge significantly increases the structural acceleration responses. For the base‐isolated bridge model considered here, the semiactive control system with MR dampers effectively precludes pounding. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
5.
ER／MR智能阻尼器耦联的带裙房高层建筑结构地震反应的半主动控制 总被引：29，自引：4，他引：25
本文建立了用ER／MR智能阻尼器耦联的带裙房高层建筑结构地震反应半主动控制的设计计算方法,文中,在导出ER／MR智能阻尼器力学模型的基础上,建立了ER／MR智能阻尼器耦联的带裙房层建筑结构地震反应的基本方程,并根据瞬时最优主动控制的原则,提出了ER／MR智能阻尼器耦联的带裙房高层建筑地震反应半主动控制的基于最优主动控制位移的“开关－耗能”半主动控制策略,应用本文方法对主楼20层,裙房5层的计算结构;受控地震反应的模拟计算结构表明,耦联主楼和裙房的半主动的ER／MR智能阻尼器可有效地抑制带裙房高层建筑结构地震反应的鞭梢效应,并可均匀地减小结构各层的震反应,是一种简单,方便和有效的智能控制装置。 相似文献
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In this paper, a new hybrid control technique, based on a combination of base-isolation and semi-active variable stiffness/damping in a superstructure, is presented. To illustrate the efficiency of the proposed control system, model tests on a mini-electromagnetic shaking table and a numerical simulation were performed. The test and numerical calculation results indicate that this new hybrid control mode with additional damping and smaller additional stiffness can achieve a better control efficiency. 相似文献
7.
两个控制装置的模拟地震振动台试验研究 总被引：2，自引：1，他引：1
本文作者设计制造了一种高效被动阻尼控制（HEDC）装置和一种半主动控制装置－主动变刚度,阻尼（AVS．D）控制装置,并对其控制机理和控制效果进行了模拟地震振动台试验研究,试验结果表明,HEDC控制效果是令人满意的,而AVS．D控制则可以获得更好的效果,尽管它仅需很少的能量输入,试验结果表明,在AVS．D控制中,装置的电磁阀处于开启状态工作的时间较长,即在大部分时间里AVS．D控制系统是通过阻尼而不足刚度来控制受控结构,这在一定程度上降低了控制时滞的影响。 相似文献
8.
This paper presents an experimental investigation on semi-active seismic response control of a multistory building with a podium structure using multiple magnetorheological (MR) dampers manipulated by a logic control algorithm. The experiments are performed in three phases on a seismic simulator with a slender 12-story building model representing a multi-story building and a relatively stiff 3-story building model typifying a podium structure. The first phase of the investigation is to assess control performance of using three MR dampers to link the 3-story building to the 12-story building, in which seismic responses of the controlled two buildings are compared with those of the two buildings without any connection and with rigid connection. The second phase is to investigate reliability of the semi-active control system and robustness of the logic control algorithm when 2 out of 3 MR dampers fail and when the electricity supply to MR dampers is completely stopped. The last phase is to examine sensitivity of semi-active control performance of two buildings to change in ground excitation. The experimental results show that multiple MR dampers with the logic control algorithm can achieve a significant reduction in seismic responses of both buildings. The proposed semi-active control system is of high reliability and good robustness. 相似文献
9.
Passive supplemental damping in a seismically isolated structure provides the necessary energy dissipation to limit the isolation system displacement. However, damper forces can become quite large as the passive damping level is increased, resulting in the requirement to transfer large forces at the damper connections to the structure which may be particularly difficult to accommodate in retrofit applications. One method to limit the level of damping force while simultaneously controlling the isolation system displacement is to utilize an intelligent hybrid isolation system containing semi-active dampers in which the damping coeffic ient can be modulated. The effectiveness of such a hybrid seismic isolation system for earthquake hazard mitigation is investigated in this paper. The system is examined through an analytical and computational study of the seismic response of a bridge structure containing a hybrid isolation system consisting of elastomeric bearings and semi-active dampers. Control algorithms for operation of the semi-active dampers are developed based on fuzzy logic control theory. Practical limits on the response of the isolation system are considered and utilized in the evaluation of the control algorithms. The results of the study show that both passive and semi-active hybrid seismic isolation systems consisting of combined base isolation bearings and supplemental energy dissipation devices can be beneficial in reducing the seismic response of structures. These hybrid systems may prevent or significantly reduce structural damage during a seismic event. Furthermore, it is shown that intelligent semi-active seismic isolation systems are capable of controlling the peak deck displacement of bridges, and thus reducing the required length of expansion joints, while simultaneously limiting peak damper forces. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
10.
本文研究半主动控制系统中磁流变(MR)阻尼器的控制力优化问题,从而提高MR阻尼器的半主动控制效果。文中首先建立了多自由度结构MR阻尼器控制系统的运动方程;然后根据MR阻尼器的出力特性提出了结构控制的半主动控制律,并对控制率中MR阻尼器的最大控制力设计值提出了不同的优化取值方法;最后仿真分析了MR阻尼器的不同最大控制力设计值对不同自由度结构的控制效果。研究表明,当设计值取最优控制力的平均绝对值或均方根值时,MR阻尼器的最大控制力比最优控制力的最大值降低了85%,而控制效果降低不多,可以满足对结构的控制要求;降低最大控制力设计值后,不但可以充分发挥MR阻尼器的出力性能,而且可以缩小MR阻尼器的设计尺寸,便于工程应用。 相似文献
11.
Multi‐storey main buildings constructed with a low‐rise podium structure possess some architectural merits but the setback features of such a building complex may lead to seismic response enlargement of the main buildings. This paper explores the possibility of using passive friction dampers to connect the podium structure to the main buildings to prevent their seismic response enlargement without violating the architectural features. A series of shaking table tests were carried out on one 3‐storey and one 12‐storey building models in fully‐separated, rigidly connected, and friction damper‐linked configurations. Four sets of seismic ground motions were selected as inputs to the shaking table. The control competence of two buildings linked with friction damper was evaluated by comparison of their responses with those from fully‐separated and rigidly connected cases. Experimental results showed that unfavourable seismic response amplification did occur in the building complex in the rigidly connected case. By contrast, friction damper showed effectiveness in reducing absolute acceleration and interstorey drift responses of both buildings if friction force level was appropriately applied. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
12.
This paper presents results of experimental and numerical investigations of a seesaw energy dissipation system (SEDS) using fluid viscous dampers (FVDs). To confirm the characteristics of the FVDs used in the tests, harmonic dynamic loading tests were conducted in advance of the free vibration tests and the shaking table tests. Shaking table tests were conducted to demonstrate the damping capacity of the SEDS under random excitations such as seismic waves, and the results showed SEDSs have sufficient damping capacity for reducing the seismic response of frames. Free vibration tests were conducted to confirm the reliability of simplified analysis. Time history response analyses were also conducted and the results are in close agreement with shaking table test results. 相似文献
13.
Neuro-fuzzy control strategy for earthquake-excited nonlinear magnetorheological structures 总被引：2，自引：0，他引：2
Magnetorheological (MR) damper is a prominent semi-active control device for earthquake responses mitigation of structures. The most important topic for the intelligent MR structures is choosing the control current of MR dampers quickly and accurately. The typical control strategy is on–off control strategy, i.e. bi-state control strategy, while inherent time-delay and coarse control precision lie in this strategy. This paper proposes neuro-fuzzy control strategy, in which the neural-network technique is adopted to solve time-delay problem and the fuzzy controller is used to determine the control current of MR dampers quickly and accurately. Through comparison between the bi-state control and the neuro-fuzzy control strategies and a numerical example about a three-story reinforced concrete structure, it can be concluded that the control strategy is very important for semi-active control, the neuro-fuzzy control strategy can determine currents of MR dampers quickly and accurately, and the control effect of the neuro-fuzzy control strategy is better than that of the bi-state control strategy. 相似文献
14.
带粘弹性阻尼器结构振动台试验设计——基于OpenSees的阻尼器尺寸选择 总被引：2，自引：0，他引：2
基于带粘弹性阻尼器钢框架结构振动台试验,提出了基于OpenSees的阻尼器尺寸选择方法。首先,通过试验获得一种特定尺寸阻尼器的滞回曲线,根据粘弹性阻尼器相似理论,将其转换为一系列不同尺寸的阻尼器滞回曲线。使用Bouc-Wen模型对它们进行参数识别并添加到结构分析模型中,利用OpenSees软件对添加阻尼器结构和纯框架结构进行不同水准的3条地震波下动力时程分析。最后,通过综合考查阻尼器的减震效果和最大应变来确定合适的用于振动台试验当中的阻尼器尺寸。结果表明,本方法可避免对不同尺寸阻尼器逐个进行性能试验,Bouc-Wen模型可较准确地模拟阻尼器力学性能,OpenSees非线性动力时程分析可准确模拟试验过程,根据提出的选择指标能简单方便地确定阻尼器的尺寸。 相似文献
15.
被动及半主动摩擦阻尼器对合肥翡翠电视塔地震反应的控制 总被引：5，自引：0，他引：5
摩擦阻尼器是一种构造简单的耗能减振装置,已应用于国内外多座新建建筑的抗震设计和已建建筑的抗震加固．半主动磨擦阻尼器则通过调整阻尼器的起滑力来改善被动摩擦阻尼器的耗能减振性能。本文研究了被动及半主动摩擦阻尼器对于高耸塔架结构地震反应的减振效果。为满足摩擦阻尼器对高耸塔架结构风振控制的特殊需要,本文建立了合肥电视塔的空间桁架有限元模型和串联多自由度体系模型,并在形成控制力变换矩阵和计算摩擦阻尼器两端的相对位移的过程中综合地运用了这两种力学模型。在半主动摩擦阻尼器的控制策略方面,本文提出了一种基于次优控制理论的半主动控制策略．本文研究表明,摩擦阻尼器可以抑制高耸塔架结构的地震反应．而半主动摩擦阻尼辞的耗能减振效果明显优于被动摩擦阻尼器． 相似文献
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针对目前隔震体系尚不能减小竖向地震反应的缺陷,提出并研制了采用碟形弹簧的竖向半主动隔震装置。竖向半主动隔震装置是由碟形弹簧和外套油缸组成的,且由电磁阀控制油缸内油体与外接蓄油箱内油体间的油路,可实现竖向半主动隔震控制,提出了竖向隔震控制的半主动策略,结合水平隔震支座可实现三维隔震。通过振动台地震模拟实验,验证了三维隔震体系的效能,该研究对高烈度地区隔震技术的改善具有应用参考价值。 相似文献
17.
基于H∞理论的磁流变阻尼器半主动容错控制 总被引：1，自引：0，他引：1
建筑结构的半主动控制系统中的传感器,在强震作用下可能因出现故障而影响控制效果。以磁流变阻尼器为例,研究半主动容错控制系统的设计方法。首先,研究了基于状态观测器的半主动H∞控制器设计方法,并将之应用到建筑结构采用磁流变阻尼器的减振控制中;运用改进Bouc-Wen模型,计算磁流变阻尼器的阻尼力,通过求解一个代数Riccati方程和一个状态观测方程,得出了基于状态观测器的H∞主动控制律;再对其采用Clipped-optimal方法实施半主动控制策略。然后,针对传感器故障,利用观测器组的输出残差对故障进行在线诊断,并通过几个观测器状态值的比较得到故障的大小,并据此对传感器的测量值进行修正,从而消除故障对闭环系统的影响,最终实现半主动H∞容错控制。仿真结果表明,该方法具有很好的容错控制效果。 相似文献
18.
Base isolated structures have been found to be at risk in near-fault regions as a result of long period pulses that may exist in near-source ground motions.Various control strategies,including passive,active and semi-active control systems,have been investigated to overcome this problem.This study focuses on the development of a semi-active control algorithm based on several performance levels anticipated from an isolated building during different levels of ground shaking corresponding to various earthquake hazard levels.The proposed performance-based algorithm is based on a modified version of the well-known semi-active skyhook control algorithm.The proposed control algorithm changes the control gain depending on the level of shaking imposed on the structure.The proposed control system has been evaluated using a series of analyses performed on a base isolated benchmark building subjected to seven pairs of scaled ground motion records.Simulation results show that the newly proposed algorithm is effective in improving the structural and nonstructural performance of the building for selected earthquakes. 相似文献
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消能减震高层方钢管混凝土框架结构振动台试验研究和弹塑性时程分析 总被引：2，自引：0，他引：2
本文首先介绍了一幢安装了粘滞阻尼器的复杂体型高层方钢管混凝土框架结构的1/15缩尺模型的模拟地震振动台试验结果;在此基础上,建立了梁、柱构件的多弹簧模型并组建了整体结构的计算分析模型,运用此计算模型首先对试验模型结构进行了动力弹塑性时程分析,计算结果和试验结果吻合较好,验证了计算模型的正确性;最后,以同样方法对原型结构进行了计算分析,并结合试验结果研究探讨了此结构的抗震性能和阻尼器的消能减震效果。结果表明:该结构未出现明显的薄弱层,能够满足规范的抗震设防要求,阻尼器发挥了一定的消能减震效果,进一步提高了结构的抗震性能。 相似文献