共查询到20条相似文献，搜索用时 140 毫秒
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薄弱层设置耗能阻尼器支撑的钢框架模型振动台试验 总被引：2，自引：0，他引：2
设计制作了一个五层钢框架模型,在其第一层、第三层和第五层薄弱层分别设置摩擦阻尼器、粘弹性阻尼器和粘弹性-摩擦阻尼器等三种耗能阻尼器支撑,进行了罕遇地震和多遇地震下的振动台试验。试验结果表明,耗能阻尼器支撑能够有效地控制结构的地震反应。 相似文献
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粘弹性阻尼器（ved）是抗震被动控制中一种十分有效的耗能减震装置。本文根据粘弹性阻尼材料的应力－应变关系，推导了粘弹性阻尼器和人字型支撑的组合层间单元刚度矩阵及单元控制力向量；并基于框架结构的空间特性，建立了设置斜撑Ved框架结构在考虑空间协同分析的基础上地震反应时程分析的控制方法；最后，应用本文的方法，对设置Ved斜支撑后钢筋混凝土框架结构进行了结构地震反应时程分析，并根据计算结果对其减震效果进行了分析讨论。 相似文献
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在海洋平台摇摆墙体系基础上,在摇摆墙底部的铰接点处安装一粘弹性转角阻尼器,进行被动消能结构振动控制,利用ANSYS进行地震荷载作用下的抗震性能验算,并对阻尼器的刚度和阻尼参数进行了分析。结果表明,在摇摆墙底部施加的转角阻尼器能显著降低结构的地震反应。 相似文献
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粘弹性阻尼器连接的相邻结构非线性随机地震反应分析 总被引：7，自引：1，他引：7
本文用随机等价线性化方法探讨了相邻结构之间用粘弹性阻尼器连接后的非线性随机地震反应，分析发现：在小震作用下，粘弹性阻尼器对相邻结构可以同时达到较好的控制效果；但是在强烈地震作用下，安装粘弹性阻尼器有可能会在减少一个结构的地震反应的同时，增大另外一个结构的地震反应。 相似文献
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铅粘弹性阻尼器性能试验研究 总被引：14，自引：0，他引：14
本文介绍了作者提出的铅粘弹性阻尼器的构造和原理，对铅粘弹性阻尼器在不温度，频率，应应幅值和粘弹性层厚度的情况下进行了试验，分析研究了温度，频率，应变幅值和粘弹性层度对铅粘弹性阻尼器性能的影响规律，同时，对铅粘弹性阻尼器进行了低周疲劳试验和大变形试验，考察了铅粘弹性阻尼器的疲劳性能和极限变形能力，最后给出了有关的结论和建议。 相似文献
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历次地震震害表明,底框砌体结构在遭遇大地震时破坏严重。本文比较了《GBJ11-89建筑抗震设计规范》和《GB50011-2001建筑抗震设计规范》中关于该类结构的抗震设计要求。参考某地一个实际底框砌体结构建筑设计资料,分别按上述两版本规范设计了2个具有代表性的底框砌体结构。采用层间剪切模型基于IDA方法对结构进行了地震易损性分析,对比分析结果表明:按两版本规范设计的底框砌体结构的破坏均出现在过渡层;在设防地震作用下,按《89规范》设计的结构达到中等破坏的概率最大,使用功能受到影响,按《01规范》设计的结构达到轻微破坏状态的概率最大,使用功能基本无影响;在罕遇地震作用下,按《01规范》设计的结构发生严重破坏和毁坏的概率比按《89规范》设计的结构明显降低,抗震能力明显提高。本文提供的结果可丰富底框砌体结构地震易损性数据,为区域地震风险评估、震害预测等研究提供更加精细的易损性模型。 相似文献
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This paper investigates the seismic response control of a 20-story nonlinear benchmark building with a new recentering variable friction device (RVFD). The RVFD combines energy dissipation capabilities of a variable friction damper (VFD) with the recentering ability of shape memory alloy (SMA) wires. The VFD that is the first subcomponent of the hybrid device consists of a friction generation unit and piezoelectric actuators. The clamping force of the VFD can be adjusted according to the current level of ground motion by adjusting the voltage level of piezoelectric actuators. SMA wires that exhibit a unique hysteretic behavior and full shape recovery after experiencing large strains is the second subcomponent of the hybrid device. Numerical simulations of a seismically excited 20-story benchmark building are conducted to evaluate the performance of the hybrid device. A continuous hysteretic model is used to capture frictional behavior of the VFD and a neuro-fuzzy model is employed to describe highly nonlinear behavior of the SMA components of the hybrid device. A fuzzy logic controller is developed to adjust the voltage level of VFDs for favorable performance in an RVFD hybrid application. Results show that the RVFD modulated with a fuzzy logic control strategy can effectively reduce interstory drifts and permanent deformations without increasing acceleration response of the benchmark building for most cases. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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The effects of the interaction among sea water, sediment, backfill-soil and coastal structures (embankments) were included in the present study. The formulation is derived from fundamental theories in various fields, including marine hydrodynamics, flow in porous medium, and structural dynamics. The hybrid finite-difference and finite element methods were used in the analysis. The finite-difference method was used to calculate the nonlinear hydrodynamic pressures of sea water as well as the pore water in the sediment acting on the coastal embankment faces by seismic-wave actions. The fluid-filled solid mixture was used to model sediment and back-fill soil and the corresponding dynamic responses were also evaluated by finite difference method. The dynamic response of the coastal structures was calculated by finite element method. The numerical results are presented for various water depths and ground motion intensities. The significant dynamic forces on coastal structures were calculated during earthquakes and the possible sliding of the coastal embankment will occur and the special foundation treatment should be made. 相似文献
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This study presents a numerical multi-scale simulation framework which is extended to accommodate hybrid simulation (numerical-experimental integration). The framework is enhanced with a standardized data exchange format and connected to a generalized controller interface program which facilitates communication with various types of laboratory equipment and testing configurations. A small-scale experimental program was conducted using a six degree-of-freedom hydraulic testing equipment to verify the proposed framework and provide additional data for small-scale testing of shearcritical reinforced concrete structures. The specimens were tested in a multi-axial hybrid simulation manner under a reversed cyclic loading condition simulating earthquake forces. The physical models were 1/3.23-scale representations of a beam and two columns. A mixed-type modelling technique was employed to analyze the remainder of the structures. The hybrid simulation results were compared against those obtained from a large-scale test and finite element analyses. The study found that if precautions are taken in preparing model materials and if the shear-related mechanisms are accurately considered in the numerical model, small-scale hybrid simulations can adequately simulate the behaviour of shear-critical structures. Although the findings of the study are promising, to draw general conclusions additional test data are required. 相似文献
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为研究装配式木柱与钢筋混凝土混合结构梁柱柔性节点的非线性力学性能,设计一种木柱与钢筋混凝土混合结构装配节点.利用 ABAQUS软件建立有限元模型,并对节点模型进行单调加载荷载分析和低周反复加载分析,主要研究橡胶硬度和竖向荷载对装配节点的破坏特征、滞回曲线、骨架曲线、承载力及耗能能力等非线性力学性能的影响,并与相关文献对比,验证分析方法的可行性.结果表明:该柔性节点的主要破坏模式有柱脚受压屈曲、受拉抬起现象和橡胶压缩变形破坏.柔性装配节点的承载力、刚度、延性与其阻尼材料的硬度二者呈正比关系.随着阻尼材料硬度提高,可以有效限制柱体侧倾和柱脚抬起现象.当采用71HA 硬度的橡胶材料时其耗能能力较好.同时,竖向荷载对装配节点的阻尼比影响较大,增加竖向荷载可以有效提高该节点的黏滞阻尼比. 相似文献
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Ming‐Chieh Chuang Shang‐Hsien Hsieh Keh‐Chyuan Tsai Chao‐Hsien Li Kung‐Juin Wang An‐Chien Wu 《地震工程与结构动力学》2018,47(2):269-293
To improve the efficiency of model fitting, parameter identification techniques have been actively investigated. Recently, the applications of parameter identification migrated from off‐line model fitting to on‐line model updating. The objective of this study is to develop a gradient‐based method for model updating to advance hybrid simulation also called hybrid test. A novel modification of the proposed method, which can reduce the number of design variables to improve the identification efficiency, is illustrated in detail. To investigate the model updating, simulated hybrid tests were conducted with a 5‐story steel frame equipped with buckling‐restrained braces (BRBs) utilized in the shaking table tests conducted in E‐Defense in Japan in 2009. The calibrated analytical model that was verified with the test results can serve as the reference model. In the simulated hybrid tests, the physical BRB substructure is numerically simulated by utilizing a truss element with the 2‐surface model identical to the part of the reference model. Such numerical verification allows simulation of measurement errors for investigation on the performance of the proposed method. Moreover, the feasibility of sharing the identified parameter values, which were obtained from the physical substructure responses, with the relevant numerical models is also verified with the artificial component responses derived from the physical experiments. 相似文献
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The main aim of this work is to develop, verify and apply in simulation study an efficient hybrid approach to study seismic response of a soil-structure system taking into account all the important components as: (1) the line time-harmonic source with its specific geophysical properties; (2) the inhomogeneity and heterogeneity of the wave path from the source to the local geological region; (3) the geotechnical properties of the near-field local geological profile and finally (4) the properties of the engineering structure itself. Plane strain state is considered. The hybrid computational tool is based on the boundary element method (BEM1) for modeling the infinite far-field geological media and finite element method (FEM2) for treating the dynamic behavior of the structure and the near-field finite soil geological region. Each of the two techniques is applied in that part of the whole model where it works more efficiently. The hybrid numerical scheme is realized via the sub-structure approach, direct BEM1, conventional FEM2 and insertion of the BEM1 model of the seismically active far-field geological media as a macro-finite element (MFE3) in the FEM2 commercial program ANSYS. The accuracy and verification study of the proposed method is presented by solution of numerical test examples simulating different seismic scenarios. The obtained results show clearly that the hybrid model is able to demonstrate the sensitivity of the synthetic signals to the source properties, to the heterogeneous character of the wave path, to the relief peculiarities of the local layered geological deposit and to the specific properties of the engineering structure. 相似文献
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This study presents a fast algorithm for collapse behavior simulation of space truss structures under extreme earthquake excitation by introducing the Woodbury formula to efficiently solve the structural response caused by material and geometric nonlinearity (hybrid nonlinearity). The Woodbury formula, which is an efficient tool in mathematics for solving low-rank perturbation problems, has successfully been used to improve the efficiency of local material nonlinear analysis but still has difficulties with seismic collapse analysis in which geometric nonlinearity should be considered. In this study, by implementing stiffness matrix decomposition according to the unchanged reference configuration, the effects of hybrid nonlinearity on the change in tangent stiffness of truss structures are uniformly formulated in the form of hybrid nonlinear perturbation to the reference elastic stiffness. Thus, a hybrid nonlinearity separated governing equation can be established, in which the hybrid nonlinear behaviors are depicted by the additional nonlinear degrees of freedom (NLDOFs) separated from the reference system. This allows for employing the Woodbury formula to perform seismic collapse analysis of space truss structures for avoiding the repeated updating of the global stiffness. To overcome the adverse effect of the large NLDOF number caused by the global characteristics of geometric nonlinearity on the efficiency advantages of the Woodbury formula during seismic collapse analysis, an element state judgment strategy and an adaptive restart mechanism are presented to activate only a small number of NLDOFs within critical local regions. The accuracy and efficiency of the proposed method are verified by two numerical examples. 相似文献
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针对当前钢筋混凝土震后存活预测相关方法存在预测值与实际值拟合度低的问题,提出基于有限元的钢筋混凝土框架结构震后可存活概率预测方法。利用混凝土本构模型关联数值和钢筋本构模型数值计算,实现钢筋混凝土框架材料本构模型关联数值分析。结合建筑和结构施工图实现钢筋混凝土有限元模拟,将钢筋混凝土框架有限元模型的最大竖向荷载作为结构整体构造竖向极限承载力,并引入随机Pushdown方法及随机竖向IDA法得到钢筋混凝土框架震后可存活概率。经实验证明,将有限元应用至钢筋混凝土框架结构震后可存活概率预测中切实可行;预测值与实际值拟合度高于目前常用方法。所提方法的性能完善,可为该领域发展提供可借鉴的信息。 相似文献