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1.
根据软弱场地土上地铁车站结构大型振动台模型试验结果,以软件ABAQU S为平台,采用记忆型嵌套面黏塑性动力本构模型和动塑性损伤模型,分别模拟土体和车站结构混凝土的动力特性,建立了土-地铁车站结构非线性动力相互作用二维和三维有限元分析模型,对各种试验工况下地基土-地铁车站结构体系的地震反应进行了数值模拟,并与试验结果进行了对比。结果表明：二维、三维数值模拟与振动台模型试验结果基本一致,三维模型可更好地模拟软弱场地与地铁车站结构的动力相互作用及模型结构的动力反应。数值模拟结果和振动台试验结果可相互验证其可靠性。 相似文献
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根据非一致地震激励地下综合管廊振动台模型试验结果,以有限元软件ABAQUS为平台,定义了约束方程来考虑层状剪切砂箱的模型箱效应。土体采用线性扩展Drucker-Prager本构模型,并采用主从接触面模型考虑土-结构相互作用,建立了三维有限元模型。对各种试验输入工况下土-综合管廊体系的地震反应进行了数值模拟,并与试验结果进行了对比。结果表明:数值模拟结果与模型试验结果吻合较好。文中所提建模方法合理,可用于后续的分析。 相似文献
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地铁车站结构大型振动台试验与数值模拟的比较研究 总被引：4，自引：1，他引：3
根据可液化土层上土-地铁车站结构动力相互作用大型振动台模型试验结果,以软件ABAQUS为平台,将地基土-地铁车站结构体系视为平面应变问题,采用记忆型嵌套面黏塑性动力本构模型模拟土体的动力特性,采用混凝土动塑性损伤模型模拟车站结构混凝土的动力特性,建立了土-地铁车站结构非线性动力相互作用的有限元分析模型,对各种试验工况下地基土-地铁车站结构体系的地震反应进行了数值模拟,并与试验结果进行了对比,结果表明:数值模拟与振动台模型试验结果基本一致,体现出了相似的规律性,相互印证了计算分析的力学建模和振动台试验结果的正确性。 相似文献
4.
合理选择本构模型是土动力学问题数值模拟中的一项重要工作。利用PLAXIS 2D软件的土工实验模拟功能分别对4种常用的岩土本构模型——线弹性模型、摩尔库伦模型、土体硬化模型和小应变土体硬化模型在往复荷载下的理论滞回曲线进行了对比分析，并在此基础上研究了选择不同本构模型对自由场地震反应分析结果的影响以及不同本构模型中各参数的变化对场地动力计算结果的敏感性分析。研究结果为土动力学问题数值模拟中如何选择本构模型和合理判断数值分析结果提供了参考依据。 相似文献
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基于考虑土-结构相互作用(SSI)效应的隔震结构体系振动台模型试验,以ABAQUS软件为计算平台,考虑土体的非线件特性,建立了将土体一桩基-隔震结构视为共同工作整体的三维有限元模型,对各种试验工况下的地震反应进行了数值模拟计算,并与试验结果进行了对比分析,结果表明:数值模拟和振动台模型试验结果基本一致,两者得到的SSI效应对隔震结构地震反应的影响体现出相似的规律性,印证了数值模型的正确性. 相似文献
7.
用ANSYS模拟结构-地基动力相互作用振动台试验的建模方法 总被引：37，自引：6，他引：37
本文以结构－地基动力相互作用振动台模型试验为基础，结合通用有限元软件ANSYS，对结构－地基动力相互作用体系进行有限元计算建模的一些问题作了研究，主要包括柔性土容器的模拟、土体动力本构模型的选用、土体与结构交界面上的状态非线性模型、网格划分、重力的考虑、结构中钢筋的处理以及对称性的应用等。文中给出了利用上述建模方法对结构－地基动力相互作用体系进行计算的一些加速度时程结果，并与试验结果相对照，吻合较好。通过计算分析，验证了简化处理方法的合理性和计算模型的可行性。 相似文献
8.
一般在进行振动台模型试验时,由于试验引起结构构件损伤,很难在试验前或试验后实测构件或节点的力学参数,但是对于整体弹性模型或部分弹性模型,可以事后对其力学性能进行实测,将实测数据用于修正计算模型,经过修正的计算结果与振动台试验结果有更好对比性。体外预应力自复位框架(EPSCF)是一种新型抗震结构,将预应力筋设置在梁柱构件体外,达到易施工、易监测、可更换的目的。在振动台试验中,EPSCF主体结构保持弹性,耗能装置损坏。振动台试验后,进行EPSCF主体结构低周反复静力试验,实测结构在侧向力作用下的滞回曲线与骨架曲线,并计算出结构每层的抗侧刚度及等效阻尼比。将实测参数代入有限元模型中进行地震响应数值模拟,并与振动台试验结果进行对比。研究结果表明,经过静力试验校准的计算模型能更好地模拟振动台试验结果。 相似文献
9.
为了研究HTRB630E级高强钢筋的基本力学参数和疲劳性能,本文进行了应变等幅低周疲劳性能试验,并将试验结果与HRB400级钢筋的结果进行了对比分析。首先,基于应变等幅低周疲劳试验数据点,对OpenSees程序中Reinforcing Steel材料本构的疲劳参数Cf、Cd和α进行拟合,然后采用拟合的Reinforcing Steel材料本构疲劳三参数,基于OpenSees软件对钢筋混凝土柱有限元纤维模型进行数值模拟,最后将数值结果与试验柱结果对比分析。结果表明:拟合的疲劳三参数对有限元纤维模型有优化效果,为配置HTRB630E级高强钢筋混凝土结构数值纤维模型提供参考。 相似文献
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Laboratory study of seismic free-field response of sand 总被引：2，自引：0，他引：2
This paper describes a new soil-structure interaction test box for use on a moderately large shaking table. The test box is designed to replicate, as nearly as possible, the free-field seismic response of a soil layer overlying a rigid base. Results from shaking table testing are presented which demonstrate the ability of the test box to serve as a large-scale shear device. The test box is unique in its ability to determine dynamic shear modulus for both high- and low-amplitude shear strain, and also to study the dynamic response of sand under low levels of confining stress. Dynamic shear modulus for standard Ottawa sand was measured over a wide range of shear strain amplitude and compared with data from the existing literature. Finally, based on results from the test box, a constitutive model is proposed which describes the free field response of a sand layer overlying bedrock and subjected to vertically propagating SH waves. The model is simple in form with a single parameter uniquely related to the friction angle of the sand. 相似文献
12.
Seismic response of underground utility tunnels: shaking table testing and FEM analysis 总被引：2，自引：1，他引：1
Underground utility tunnels are widely used in urban areas throughout the world for lifeline networks due to their easy maintenance
and environmental protection capabilities. However, knowledge about their seismic performance is still quite limited and seismic
design procedures are not included in current design codes. This paper describes a series of shaking table tests the authors
performed on a scaled utility tunnel model to explore its performance under earthquake excitation. Details of the experimental
setup are first presented focusing on aspects such as the design of the soil container, scaled structural model, sensor array
arrangement and test procedure. The main observations from the test program, including structural response, soil response,
soil-structure interaction and earth pressure, are summarized and discussed. Further, a finite element model (FEM) of the
test utility tunnel is established where the nonlinear soil properties are modeled by the Drucker-Prager constitutive model;
the master-slave surface mechanism is employed to simulate the soil-structure dynamic interaction; and the confining effect
of the laminar shear box to soil is considered by proper boundary modeling. The results from the numerical model are compared
with experiment measurements in terms of displacement, acceleration and amplification factor of the structural model and the
soil. The comparison shows that the numerical results match the experimental measurements quite well. The validated numerical
model can be adopted for further analysis. 相似文献
13.
液化场地土-地铁车站结构大型振动台模型试验研究 总被引：5，自引：2，他引：5
本文对浅埋于可液化南京细砂地基中的地铁车站结构进行了大型振动台试验研究,对部分试验结果进行了整理,分析了模型地基的加速度和振动孔隙水压力的反应规律。试验结果表明:在整个试验过程中,模型地基浅层土和地铁车站侧向附近地基土最容易发生液化;其次,随着振动台台面输入地震动峰值加速度的增大,离车站结构较远的侧向地基土和底层地基土再发生液化,而车站结构正下方的模型地基土最不容易液化。同时,在模型地基土发生液化后,地铁车站结构发生了明显的整体上浮现象。 相似文献
14.
土-结构体系振动台模型试验中土层边界影响问题 总被引：35，自引：6，他引：29
通过数值模拟和模型试验,初步探讨了土－结构相互作用体系模型试验中土层侧向边界的影响情况,研究了土层边界处加入橡胶层后的作用,从而为土－结构相互作用体系模型试验设计提供了一些依据。 相似文献
15.
《Soil Dynamics and Earthquake Engineering》2012,32(12):1690-1702
Simulating dynamic soil–structure interaction (SSI) problems is a challenge when using a shaking table because of the semi-infinity of soil foundations. This paper develops real-time dynamic hybrid testing (RTDHT) for SSI problems in order to consider the radiation damping effect of the semi-infinite soil foundation using a shaking table. Based on the substructure concept, the superstructure is physically tested and the semi-infinite foundation is numerically simulated. Thus, the response of the entire system considering the dynamic SSI is obtained by coupling the numerical calculation of the soil and the physical test of the superstructure. A two-story shear frame on a rigid foundation was first tested to verify the developed RTDHT system, in which the top story was modeled as the physical substructure and the bottom story was the numerical substructure. The RTDHT for a two-story structure mounted on soil foundation was then carried out on a shaking table while the foundation was numerically simulated using a lumped parameter model. The dynamic responses, including acceleration and shear force, were obtained under soft and hard soil conditions. The results show that the soil–structure interaction should be reasonably taken into account in the shaking table testing for structures. 相似文献
16.
土-结构动力相互作用的振动台试验研究综述 总被引：1，自引：1，他引：0
本文从土-结构动力相互作用振动台试验过程中所涉及的结构模型动力相似设计、模型土体的模拟及土体边界条件的模拟三个方面,回顾了近几年来土-结构动力相互作用振动台试验研究的发展历程与现状,重点描述了试验过程中为了更好地反映震动条件下土与结构动力相互作用的机理,学者们所采取的办法和措施。并在此基础上,介绍了一种新的研究土-结构动力相互作用的振动台试验技术。最后,总结了传统的土箱-振动台试验存在的不足,并与这种新的试验技术进行了对比,提出了对于这种新的试验方法仍需要进一步研究和解决的问题。 相似文献
17.
Qiang Wang Jin-Ting Wang Feng Jin Fu-Dong Chi Chu-Han Zhang 《Soil Dynamics and Earthquake Engineering》2011
Simulating dynamic soil–structure interaction (SSI) problems is a challenge when using a shaking table because of the semi-infinity of soil foundations. This paper develops real-time dynamic hybrid testing (RTDHT) for SSI problems in order to consider the radiation damping effect of the semi-infinite soil foundation using a shaking table. Based on the substructure concept, the superstructure is physically tested and the semi-infinite foundation is numerically simulated. Thus, the response of the entire system considering the dynamic SSI is obtained by coupling the numerical calculation of the soil and the physical test of the superstructure. A two-story shear frame on a rigid foundation was first tested to verify the developed RTDHT system, in which the top story was modeled as the physical substructure and the bottom story was the numerical substructure. The RTDHT for a two-story structure mounted on soil foundation was then carried out on a shaking table while the foundation was numerically simulated using a lumped parameter model. The dynamic responses, including acceleration and shear force, were obtained under soft and hard soil conditions. The results show that the soil–structure interaction should be reasonably taken into account in the shaking table testing for structures. 相似文献
18.
考虑SSI效应储油罐的子结构实验方法与数值模拟 总被引：1，自引：0，他引：1
提出了应用振动台子结构试验方法来研究考虑土-结构相互作用（SSI）效应储罐的抗震性能,该方法将土体简化为双自由度八参量集总参数模型进行模拟,储罐作为试验子结构应用振动台加载,两部分联机完成振动台子结构试验。该方法能完成大比例尺储罐试验,具有传统试验方法难以比拟的优势。然后,通过数值模拟分析了SSI效应对储罐动力响应的影响。分别研究了不同储液高度和不同地基刚度对储罐位移和加速度响应的影响。研究结果表明：考虑SSI效应时,罐体位移响应和加速度响应均有所减小,土质越软,效果越明显;随着储液高度的增高,位移、加速度反应呈现减小趋势。 相似文献
19.
I. Anastasopoulos T. GeorgarakosV. Georgiannou V. DrososR. Kourkoulis 《Soil Dynamics and Earthquake Engineering》2010
Reinforced-soil retaining structures possess inherent flexibility, and are believed to be insensitive to earthquake shaking. In fact, several such structures have successfully survived destructive earthquakes (Northridge 1994, Kobe 1995, Kocaeli 1999, and Chi-Chi 1999). This paper investigates experimentally and theoretically the seismic performance of a typical bar-mat retaining wall. First, a series of reduced-scale shaking table tests are conducted, using a variety of seismic excitations (real records and artificial multi-cycle motions). Then, the problem is analyzed numerically employing the finite element method. A modified kinematic hardening constitutive model is developed and encoded in ABAQUS through a user-defined subroutine. After calibrating the model parameters through laboratory element testing, the retaining walls are analyzed at model scale, assuming model parameters appropriate for very small confining pressures. After validating the numerical analysis through comparisons with shaking table test results, the problem is re-analyzed at prototype scale assuming model parameters for standard confining pressures. The results of shaking table testing are thus indirectly “converted” (extrapolated) to real scale. It is shown that: (a) for medium intensity motions (typical of Ms≈6 earthquakes) the response is “quasi-elastic”, and the permanent lateral displacement in reality could not exceed a few centimeters; (b) for larger intensity motions (typical of Ms≈6.5–7 earthquakes) bearing the effects of forward rupture directivity or having a large number of strong motion cycles, plastic deformation accumulates and the permanent displacement is of the order of 10–15 cm (at prototype scale); and (c) a large number of strong motion cycles (N>30) of unrealistically large amplitude (A=1.0 g) is required to activate a failure wedge behind the region of reinforced soil. Overall, the performance of the bar-mat reinforced-soil walls investigated in this paper is totally acceptable for realistic levels of seismic excitation. 相似文献
20.
采用ABAQUS建立12层剪力墙结构的有限元模型，利用该结构1/5缩尺模型振动台试验时预留试块的材性试验结果及相似关系，确定相应原型结构材料的性能参数，将试验参数和我国混凝土结构设计规范给出的混凝土单轴受拉/压应力-应变关系曲线相结合，确定ABAQUS模型中混凝土损伤塑性模型所需的应力-应变参数；将试验参数和张劲公式法相结合，确定ABAQUS模型中混凝土损伤塑性模型所需的损伤因子参数。对比有限元分析结果和振动台试验结果，验证参数设置的有效性。ABAQUS有限元分析和振动台试验所得原型结构前三阶振型和自振周期相差很小，说明ABAQUS模型和参数设置能够反映并用于计算实际结构的弹性响应。ABAQUS有限元分析得到的结构损伤情况与试验模型的损伤情况基本一致；结构的顶点加速度曲线和滞回曲线等响应的有限元分析结果与试验结果在多遇地震作用下基本吻合，但由于振动台试验累积损伤的影响，两者的差异随着地震波幅值的增大而逐渐增大；ABAQUS有限元分析得到的位移包络曲线与剪力墙结构弯曲变形的特点相符。以上弹塑性分析结果进一步表明了ABAQUS模型和参数设置能够很好地模拟结构在地震作用下的响应。 相似文献