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地震信号瞬时参数实时计算方法 总被引：3，自引：0，他引：3
本文在简单介绍了信号瞬时参数实时计算方法的基础上,提出了一种新的基于稳态化假定的瞬时参数计算方法;通过与其它常用方法的对比分析,检验了本文提出的方法的精度和稳定性。 相似文献
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结构地震反应的非全状态控制 总被引：4，自引：2，他引：4
本文提出了地震下结构芳动控制的一种非全状态控制算法和控制器位置与算法参数统一优化的概念及其统一优化的方法，文中对某试验用模型结构，用红典线最优控制算法和本文提出的控制算法进行了主动控制仿真分析，同时用本文提出的统一优化方法对控制器位置和算法参数进行了优化，结果表明，本文提出的统一优化概念和方法合理可行，控制算法可以取得良好的控制效果。 相似文献
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本文论述了模式识别在地震油气解释中的应用,并提出了一套实现的方法.在地震资料处理中提出了信息保持的思想和处理方法.从特殊处理后的地震记录中提取多种地震特征,这些特征主要来自地震道的自回归系数、最大熵频谱和自相关函数.利用聚类分析和判别分析方法对地震特征向量进行分类,实例表明,本文提出的地震模式识别方法能有效地划分油气储集层,即使在油层较薄或是反射变化不明显的地区也能奏效. 相似文献
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本文研究了地震数据的稀疏分解问题.提出了一种用高斯束稀疏分解表示地震数据的方法.这是一个拟0范数约束优化问题.在求解拟0范数极小化问题的过程中,通过扫描同相轴的方法实现高斯束稀疏分解,数值实现上提出了使用一种快速单调下降的梯度优化方法.本文提出的稀疏优化方法同时具有去噪的功能,数据模拟试验表明了本方法的可行性和可靠性. 相似文献
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最近S．K．AU与J．L．Beck提出了一种高效率的线性体系的重要抽样法。本文应用0方差抽样的概念对Au和Beck的方法进行了分析,然后在此基础上把Au和Beck的方法推广到具有非线性失效面的结构体系。应用本文提出的方法对3个算例进行了计算分析,抽样20次的结果与一般抽样法10^5～10^6次的结果非常接近,表明本文方法有很高的计算效率。 相似文献
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钢筋混凝土结构基于地震损伤性能的设计 总被引：58，自引：14，他引：44
本文结合我国地震设防水准,在国内外有关地震损在量研究结果的基础上,提出钢筋混凝土结构地震损伤的“三水准”性能目标;其次,对于剪切型钢筋混凝土结构,提出了结构层间柱－压弯构件三线性恢复力模型参数确定和地震损伤计算方法;第三,提出了地震损伤直接验算和将地震损伤验算归结为变形验算的钢筋混凝土结构地震损伤性能设计方法;最后,通过设计例题说明了本文方法应用的可行性。 相似文献
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本文研究高层建筑利用调液阻尼器（ＴＬＤ）减小地震反应的方法。首先探讨了激励频率比、调谐频率比对减震效果的影响。在此基础上建立了具有不同ＴＬＤ设置方式的高层建筑体系的学模型和运动方程，首次提出了利用多个ＴＬＤ减小高层建筑多个振型的方法。最后通过数值算例验证了本文方法的有效性。 相似文献
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高层建筑利用悬吊质量摆的减震研究 总被引：12，自引：0，他引：12
本文研究了高层建筑利用悬吊质量摆的减振作用，首次提出了利用摆减小高层建筑多个振型反应的方法。文中给出了具有不同悬吊方式的摆－高层建筑结构体系的力学模型及振动方程，利用数值分析方法探讨了摆的不同悬吊方式及摆与结构的质量比等因素对结构地震反应的影响，给出了对于实际工程应用具有参考意义的结果。 相似文献
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Performance based design becomes an effective method for estimating seismic demands of buildings. In asymmetric plan tall building the effects of higher modes and torsion are crucial. The consecutive modal pushover (CMP) procedure is one of the procedures that consider these effects. Also in previous studies the influence of soil-structure interaction (SSI) in pushover analysis is ignored. In this paper the CMP procedure is modified for one-way asymmetric plan mid and high-rise buildings considering SSI. The extended CMP (ECMP) procedure is proposed in order to overcome some limitations of the CMP procedure. In this regard, 10, 15 and 20 story buildings with asymmetric plan are studied considering SSI assuming three different soil conditions. Using nonlinear response history analysis under a set of bidirectional ground motion; the exact responses of these buildings are calculated. Then the ECMP procedure is evaluated by comparing the results of this procedure with nonlinear time history results as an exact solution as well as the modal pushover analysis procedure and FEMA 356 load patterns. The results demonstrate the accuracy of the ECMP procedure. 相似文献
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高层建筑地震反应最优多重TLD控制 总被引：3，自引：1，他引：3
本文以坑层建筑地震反应进行了最优多重ＴＬＤ（ＭＴＬＤ）ｓ控制研究。文中阐述了ＴＬＤ系统的工作原理笔ＭＴＬＤｓ系统的参数；建立了多层结构－ＴＭＬＤｓ系统耦联体系的运动方程；分析了ＭＴＬＤｓ系统的参数对在谐波作用下多层结构动力反应的影响以及各参数之间的关系。 相似文献
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利用等位移原则估计高层结构的非弹性地震反应(一) 总被引：2，自引：0，他引：2
高层建筑非弹性地震反应估计是当前结构抗震研究迫切希望解决的课题。本文概略介绍了常用非弹性地震反应分析方法在高层结构分析中应用的主要问题,从而引出利用等位移原则(对于长周期体系,弹性与非弹性地震位移反应近似相等)进行高层结构非弹性地震反应估计研究的原因,并以长周期单自由度和多自由度体系弹性与非弹性地震反应之间关系的有关研究结果论述了其可行性。 相似文献
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For super high-rise buildings,the vibration period of the basic mode is several seconds,and it is very close to the period of the fluctuating wind.The damping of super high-rise buildings is low,so super high-rise buildings are very sensitive to fluctuating wind.The wind load is one of the key loads in the design of super high-rise buildings.It is known that only the basic mode is needed in the wind-response analysis of tall buildings.However,for super high-rise buildings,especially for the acceleration response,because of the frequency amplification of the high modes,the high modes and the mode coupling may need to be considered.Three typical super high-rise projects with the SMPSS in wind tunnel tests and the random vibration theory method were used to analyze the effect of high modes on the wind-induced response.The conclusions can be drawn as follows.First,for the displacement response,the basic mode is dominant,and the high modes can be neglected.Second,for the acceleration response,the high modes and the mode coupling should be considered.Lastly,the strain energy of modes can only give the vibration energy distribution of the high-rise building,and it cannot describe the local wind-induced vibration of high-rise buildings,especially for the top acceleration response. 相似文献
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One widespread problem in damping estimation of high-rise buildings is the neglect of structural modal directions, which may induce beating in measured dynamic responses along building geometric axes and thereby induce errors in damping estimations to some extent. Based on a proposed two degrees of freedom (2-DOF) simulation model, the effects of neglecting the modal directions on damping estimate are systematically investigated. The results show that the angular differences between the modal directions and the building geometric axes, as well as the frequency difference between the involved modes, both have significant effects on the damping estimate of high-rise buildings. This paper proposes a spectral method to determine the modal directions of high-rise buildings and further validate this method by an analysis of full-scale measurements from four skyscrapers. The damping ratios estimated based on the responses along the identified modal directions are more accurate than those based on those measured along the building geometric axes. Furthermore, an empirical prediction model for damping ratio of high-rise buildings with heights over 200 m is proposed based on the field measured damping results of several buildings with consideration of the modal directions. The objective of this study is to improve the accuracy of damping estimation of high-rise buildings and therefore provide useful information for the structural design of future skyscrapers. 相似文献
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Human perception to tremors during earthquakes in high-rise buildings is usually associated with psychological discomfort such as fear and anxiety. This paper presents a methodology for estimating the level of perception to tremors for occupants living in high-rise buildings subjected to ground motion excitations. Unlike other approaches based on empirical or historical data, the proposed methodology performs a regression analysis using the analytical results of two generic models of 15 and 30 stories. The recorded ground motions in Singapore are collected and modified for structural response analyses. Simple predictive models are then developed to estimate the perception level to tremors based on a proposed ground motion intensity parameter—the average response spectrum intensity in the period range between 0.1 and 2.0 s. These models can be used to predict the percentage of occupants in high-rise buildings who may perceive the tremors at a given ground motion intensity. Furthermore, the models are validated with two recent tremor events reportedly felt in Singapore. It is found that the estimated results match reasonably well with the reports in the local newspapers and from the authorities. The proposed methodology is applicable to urban regions where people living in high-rise buildings might feel tremors during earthquakes. 相似文献
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传统高层建筑地震损伤模型不能反映构件极限滞回耗能随累积幅值的改变情况,无法有效确定组合参数,离散性较大。为此,设计一种远场长周期地震下高层建筑的地震损伤模型。针对不同层次高层建筑结构,依据广义力-广义变形曲线,构建变形损伤模型。结合累积能量比、远场长周期地震瞬时输入能比构建能量损伤模型。从变形与能量两方面综合评价损伤,依据钢筋混凝土结构构建最大反应变形与耗损能量的线性组合地震损伤模型,并对其进行改进。实验选用ILA003、ILA048和TCU115三种长周期地震波,计算不同构件和高层建筑结构整体损伤结果,验证所提模型的可靠性。将所提模型应用于实际高层建筑中,发现其实用性强。 相似文献