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1.
城市所处的地震危险性环境和城市建筑物的易损性是影响复杂网络建筑物强震环境下抗毁能力的关键因素。由于现阶段对建筑物抗震抗毁能力的评定仍存在一定困难,对建筑物震害程度测评只能通过强震之后建筑物受破坏的程度进行评估,且评估结果不够精准,因此提出基于复杂网络的建筑物抗震能力的评估方法。考虑到地震中的危险性因素,以地面峰值加速度为参数对强震环境下复杂网络建筑物抗毁性进行测评和分析,在此基础上提出对复杂网络下建筑物的防震抗毁能力进行评估的相对建筑物抗震性能指数,并结合建筑物抗震能力评估标准确定其抗震能力水平;再进行仿真实验加以测量,并结合震害经验,证实该方法的有效性。 相似文献
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基于地震动参数的建筑物震害研究 总被引：15，自引：3，他引：12
本文介绍了多步简化的push—over(MSP)方法,引导出求解单体建筑物易损性指数和群体建筑物易损性指数的办法,并通过建筑物平均易损性指数曲线,来评价城市的总体抗震性能。本文不采用过去以烈度为地震输入的易损性评定方法,采用地震动参数作为城市建筑物易损性的评定标准。给出的易损性指数曲线,可用来查找不同地震动参数下各类建筑物的易损性结果,比较城市各类建筑物的抗震性能。本文研究可望在城市建筑物震害评估中有好的应用前景。 相似文献
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传统建筑物地震易损性分析忽略了不同种类建筑物在城市抗震防灾全周期中所发挥的作用,缺乏对灾后功能恢复能力的分析。针对该问题,从规划视角入手,提出基于目标-能力差距分析的建筑抗震韧性评估方法。首先,确定不同防灾功能建筑物的重要度分级,提出用功能损失和恢复时间两个指标量化表征多水准下建筑物的抗震韧性目标;其次,基于结构易损性分析估算建筑物的功能损失值,采用指数型和直线型两种恢复模型评估建筑物的恢复时间值;然后,基于功能损失值、恢复时间值与目标值之间的差距,确定建筑物的抗震韧性等级,从而根据建筑物重要度等级确定震前保障和震后救援的优先次序和韧性提升策略,为抗震防灾规划的编制提供支撑。 相似文献
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《地震工程与工程振动》2017,(2)
大坝的强震观测是传感器测量的结构在地震激励下实际的振动反应。基于强震观测进行混凝土拱坝模态参数识别,可为结构的抗震分析、健康诊断和震损评估等提供基础。本文基于Pacoima拱坝的3次地震观测数据,分别采用"输入-输出"型和"仅考虑输出"型两类方法对大坝的模态参数进行了识别,并对不同地震记录下,不同方法的识别结果进行对比。同时,结合国内外不同学者通过数值计算、大坝原型动力试验和运行模态分析等方式得到的Pacoima拱坝模态参数识别的结果,分析了基于强震观测的模态识别结果与上述方式获得的模态参数的差异,并分析了差异产生的原因。相关的研究成果,可为后续的研究提供参考。 相似文献
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历次地震的震害表明，地震造成的经济损失和人员伤亡与建筑物的破坏程度有很大的关系，对建筑物的抗震性能进行分析具有十分重要的现实意义。根据“安徽省合肥市防震减灾信息系统”中合肥市中市区房屋的抗震资料，用结构易损性分析方法对各类房屋的抗震性能进行了分析，得出按Ⅶ度设防的建筑物遭遇Ⅶ度地震时，多层砌体房屋和底层框架砖房以轻微破坏和中等破坏为主，多层钢筋混凝土框架房屋基本完好为主的结论。 相似文献
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台湾海峡7.3级地震建筑物震害分析与损失评估 总被引：1，自引：1，他引：1
对台湾海峡７．３级地震广东境内建筑物的地震破坏进行了调查，对地震损失进行了总体评估，并根据当地的工程地质情况，建筑物的结构，用材和施工特点等，分析了各种地震破坏形态和破坏规律，为今后的建筑抗震设防提出了有闪斩建议。 相似文献
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基于反应谱理论的复模态抗震设计方法 总被引：5，自引：0，他引：5
本文结合我国现行《建筑抗震设计规范》，采用复模态理论分析技术对结构非正交阻尼阵进行解耦，导出了基于反应谱理论的耗能减震结构的复模态抗震设计方法。文中提出了完整、系统的耗能减震结构复模态抗震设计方法的程序，并给出若干抗震设计实例。算例结果表明：该设计方法准确、实用，具有一定的理论意义与工程意义。 相似文献
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结构参数识别是结构抗震安全性能鉴定和健康诊断的基础,利用地震观测记录来识别结构模态参数,是地震工程领域备受关注的研究课题之一。本文利用实际结构的地震观测记录,对一维、多维和整体ARX模型三种模态参数识别方法进行了对比分析。结果表明：整体ARX模型对多自由度结构的模态参数识别较为稳定且精度较高;实际应用中多维ARX模型有时会导致丢失模态和虚假模态现象。 相似文献
11.
Tracking modal parameters from building seismic response data using recursive subspace identification algorithm 
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下载免费PDF全文 Tracking modal parameters and estimating the current structural state of a building from seismic response measurements, particularly during strong earthquake excitations, can provide useful information for building safety assessment and the adaptive control of a structure. Therefore, online or recursive identification techniques need to be developed and implemented for building seismic response monitoring. This paper develops and examines different methods to track modal parameters from building seismic response data. The methods include recursive data‐driven subspace identification (RSI‐DATA) using Givens rotation algorithm, and RSI‐DATA using Bona fide algorithm. The question on how well the results of RSI‐DATA reflect the real condition is investigated and verified with a bilinear SDOF simulation study. Time‐varying modal parameters of a four‐story reinforced concrete school building are identified based on a series of earthquake excitations, including several seismic events, large and small. Discussions on the different methods' ability to track the time‐varying modal parameters are presented. The variation of the identified building modal frequencies and damping ratios from a series of event‐by‐event seismic responses, particularly before and after retrofitting of the building is also discussed. Copyright © 2017 John Wiley & Sons, Ltd. 相似文献
12.
Closed‐form solution for seismic response of adjacent buildings connected by hydraulic actuators with linear quadratic Gaussian (LQG) controllers is presented in this paper. The equations of motion of actively controlled adjacent buildings against earthquake are first established. The complex modal superposition method is then used to determine dynamic characteristics, including modal damping ratio, of actively controlled adjacent buildings. The closed‐form solution for seismic response of the system is finally derived in terms of the complex dynamic characteristics, the pseudo‐excitation method and the residue theorem. By using the closed‐form solution, extensive parametric studies can be carried out for the system of many degrees of freedom. The beneficial parameters of LQG controllers for achieving the maximum response reduction of both buildings using reasonable control forces can be identified. The effectiveness of LQG controllers for this particular application is evaluated in this study. The results show that for the adjacent buildings of different dynamic properties, if the parameters of LQG controllers are selected appropriately, the modal damping ratios of the system can be significantly increased and the seismic responses of both buildings can be considerably reduced. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
13.
Coupling adjacent buildings using discrete viscoelastic dampers for control of response to low and moderate seismic events is investigated in this paper. The complex modal superposition method is first used to determine dynamic characteristics, mainly modal damping ratio and modal frequency, of damper-linked linear adjacent buildings for practical use. Random seismic response of linear adjacent buildings linked by dampers is then determined by a combination of the complex modal superposition method and the pseudo-excitation method. This combined method can effectively and accurately determine random seismic response of non-classically damped systems in the frequency domain. Parametric studies are finally performed to identify optimal parameters of viscoelastic dampers for achieving the maximum modal damping ratio or the maximum response reduction of adjacent buildings. It is demonstrated that using discrete viscoelastic dampers of proper parameters to link adjacent buildings can reduce random seismic responses significantly. Copyright © 1999 John Wiley & Sons Ltd. 相似文献
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Two approximate methods for decomposing complicated inelastic dynamic responses of wall buildings into simple modal responses are presented. Both methods are based on the equivalent linear concept, where a non‐linear structure is represented by a set of equivalent linear models. One linear model is used for representing only one vibration mode of the non‐linear structure, and its equivalent linear parameters are identified from the inelastic response time histories by using a numerical optimizer. Several theoretical relations essential for the modal decomposition are derived under the framework of complex modal analysis. Various numerical examinations have been carried out to check the validity of the proposed modal decomposition methods, and the results are quite satisfactory in all cases. Fluctuating bending moment and shear at any location along the wall height contributed by each individual vibration mode can be obtained. Modal contributions to shear and flexural strength demands, as well as the corresponding modal properties, under various seismic loading conditions can also be identified and examined in detail. Furthermore, the effects of higher vibration modes on seismic demands of wall buildings are investigated by using the modal decomposition methods. Several new insights into the complicated inelastic dynamics of multi‐story wall buildings are presented. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
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研究了应用主动锚索控制装置控制相邻建筑地震响应的有效性。首先，建立了主动锚索－相邻建筑系统的运动方程；然后应用广义振型分析方法，寻求了主动锚索联结的相邻建筑的力学特性，特别是振型阻尼比；最后，在频率域内应用广义振型分析与虚拟激励相结合的方法，建立了主动锚索控制装置联结相邻建筑的随机地震响应的分析方法。应用本文建立的公式，我们编制了计算机程序，进行了广泛的参数研究，以评价控制装置的有效性，并确定最优传感器类型及控制装置参数。研究表明，如果应用速度传感器，并能适当地选择主动锚索控制器的参数，则可以显著地提高系统的振型阻尼比，减小两个结构的地震响应。 相似文献
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This paper presents the application of system identification (SI) to long‐span cable‐supported bridges using seismic records. The SI method is based on the System Realization using Information Matrix (SRIM) that utilizes correlations between base motions and bridge accelerations to identify coefficient matrices of a state‐space model. Numerical simulations using a benchmark cable‐stayed bridge demonstrate the advantages of this method in dealing with multiple‐input multiple‐output (MIMO) data from relatively short seismic records. Important issues related to the effects of sensor arrangement, measurement noise, input inclusion, and the types of input with respect to identification results are also investigated. The method is applied to identify modal parameters of the Yokohama Bay Bridge, Rainbow Bridge, and Tsurumi Fairway Bridge using the records from the 2004 Chuetsu‐Niigata earthquake. Comparison of modal parameters with the results of ambient vibration tests, forced vibration tests, and analytical models are presented together with discussions regarding the effects of earthquake excitation amplitude on global and local structural modes. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
17.
随着勘探开发的不断深入,常规地震资料受分辨率的限制难以满足精细勘探开发的需求.由于地震信号不同频率成分的衰减程度不同,故可结合分频技术对各频率成分进行差异化补偿,进而提高地震资料分辨率.而常规分频技术普遍分频精度不高,存在模态混叠现象,不能较好地适用于地震资料处理.针对上述问题,本文提出基于自适应变分模态分解(VMD)... 相似文献
18.
A mode synthesis-based direct approach is presented to calculate seismic response of equipment supported on structures. The approach incorporates the effect of the dynamic interaction between the equipment and the supporting structure. The modal properties of the combined structure–equipment system are obtained by synthesizing the modal properties of the individual structures. The seismic input defined in terms of smoothed ground response spectra can be directly utilized in this approach. Both heavy and light equipment can be considered by the approach equally effectively. Numerical examples demonstrating the effectiveness of the proposed approach are presented. 相似文献
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利用混凝土拱坝地震记录识别的模态参数，可以揭示结构在地震过程中实际动力特性的变化情况，为结构地震反应分析和震后损伤评估提供重要信息。首先对模态识别常用方法的基本原理进行介绍；然后利用龙羊峡拱坝两次地震观测数据，采用"输入—输出"型和"仅考虑输出"型两类方法对大坝模态参数进行识别；最后将获得的模态识别结果与工程经验值和其他学者的研究成果进行对比，以分析评价识别结果的合理性。相关研究成果可为基于地震记录的混凝土拱坝模态参数识别的工程应用提供经验借鉴。 相似文献
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Julio C. Miranda 《地震工程与结构动力学》2013,42(7):1103-1110
This paper studies tuned mass dampers (TMDs) resulting in high modal damping for mechanical systems incorporating such devices for the purpose of seismic response reduction. Focusing on the determination of damping and tuning, the proposed methodology identifies a point of multiplicity of complex eigenvalues and eigenvectors, resulting in different parameters for TMDs according to their location with respect to such multiplicity condition. It is shown that significant equal modal damping and average modal damping can be induced by properly tuning highly damped TMDs, obtaining parameters intrinsic to the mechanical systems, and excitation independent. Further, it is shown that the methodology yields, as particular cases, two proposals by others using TMDs for the same purpose of seismic response abatement. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献