摇摆柱的地震响应分析

摇摆柱的地震响应分析(任务书,开题报告,外文翻译,论文14000字)
摘要
基于承载力的设计理念地震响应研究已经非常成熟，随着近20年来全球各地强震频发，传统设计方式的局限性就逐渐凸显。我国抗震设防要求为“小震不坏、中震可修、大震不倒”，但在大地震作用下，结构不出现塑性铰的可能性较小、基础提离等非线性行为也很难避免，因此“摇摆隔震”的理论适时地被提出。与传统方法不同的是摇摆隔震理念不再过度强化结构构件与基础的连接来避免结构在大地震作用下产生非线性行为，而是允许结构发生摇摆、基础提离、塑性铰以及地基土的塑性变形等非线性行为，并充分利用这些非线性行为来消耗地震的能量，减小地震荷载对上部结构的影响。保证上部结构的整体性，更容易做到“大震不倒”，减少人员伤亡和财产损失。
本文首先设计固定刚性摇摆柱、无滑移刚性摇摆柱、有滑移刚性摇摆柱三种工况模型，施加不同类型和幅值的地震荷载。基于试验结果初步探究摇摆结构地震响应的基本规律。
其次，通过对比分析，本文探讨了地震荷载类型和幅值、基础提离、滑移对试件水平向和竖向动力响应规律的影响，具体对比为：固定刚性柱与无滑移刚性摇摆柱试验、无滑移刚性摇摆柱与有滑移刚性摇摆柱试验等。

最后，采用接触单元法对试验进行模拟，建立考虑基础提离和滑移影响的计算方法。对比试验和数值模拟结果，探讨了计算方法的适用性，在此基础上探讨摇摆结构地震响应规律。
基于试验结果和数值分析，本文得出了基础提离、滑移对摇摆结构地震响应的影响规律，主要包括：（1）在中小地震作用下，结构尚未发生提离和滑移，但基础发生提离、滑移的趋势会减小摇摆结构体系上部结构动力响应；（2）当遇到较大地震作用，发生基础提离和滑移时，结构动力响应会明显增大，但发生滑移时结构顶部竖向动力响应会减小；（3）基于接触面的计算方法，虽能在一定程度上反映结构地震响应特点，但其无法考虑提离后再接触时的冲击效应，有其局限性.
关键词：摇摆结构；基础提离与滑移；振动台试验；地震响应；接触面单元法。

Abstract
Earthquake response research based on the design concept of bearing capacity has been very mature. With the frequent occurrence of strong earthquakes around the world in the past 20 years, the limitations of traditional design methods have become increasingly prominent. The seismic fortification requirements in China is “buildings are not broken during small earthquakes, can be repairedduring moderate earthquakes, do not fall during large earthquakes”, but under the action of large earthquakes, there is little possibility that the structure does not have plastic hinges, and nonlinear behaviors such as foundation lift-off are also difficult Avoiding, therefore, the theory of 'rocking isolation' was timely presented. Different from the traditional method, the concept of oscillating isolation does not over-strengthen the connection between the structural members and the foundation to avoid the nonlinear behavior of the structure under large earthquakes. Instead, it allows the structure to oscillate, the foundation to lift off, the plastic hinge and the foundation soil. Plastic deformation and other nonlinear behavior, and make full use of these nonlinear behaviors to consume the energy of the earthquake, reduce the impact of seismic load on the upper structure. To ensure the integrity of the superstructure, it is easier to achieve a “not fall in the big earthquake” and reduce casualties and property losses. [资料来源：www.doc163.com]
Firstly, this paper designs a fixed rigid rocking column, a non-sliding rigid rocking column, a sliding rigid rocking column model, and applies different types and amplitudes of seismic loads. Based on the experimental results, the basic laws of the seismic response of rocking structures were preliminarily explored.
Secondly, through comparative analysis, this paper discusses the influence of seismic load types and amplitudes, foundation lift-off and slip on the horizontal and vertical dynamic response laws of the specimens. The specific comparisons are: fixed rigid columns and non-sliding rigid rocking columns. Tests, non-sliding rigid rocking columns and sliding rigid rocking column tests.
Finally, the contact element method was used to simulate the test, and a calculation method considering the influence of the lift-off and slip of the foundation was established. Comparing the results of the experiments and numerical simulations, the applicability of the calculation method was discussed. On this basis, the law of seismic response of the rocking structure was discussed. [来源：http://www.doc163.com]
After experiments and numerical simulation analysis, this paper has obtained the basic lift-off. The influence law of slip on the seismic response of the rocking structure mainly includes: (1) During the action of medium-small earthquakes, the basic lift-off and slip will reduce the upper part of the rocking structure system. Structural dynamic response. (2) When large earthquakes are encountered and the basic lift-off and slip occur, the structural dynamic response will obviously increase, but the vertical dynamic response at the top of the structure will decrease when slip occurs (3) Calculation based on the contact surface Although the method can reflect the characteristics of structural earthquake response to a certain extent, it cannot consider the impact effect when it is lifted and then contacted. It has its limitations.
Key words: Rocking structure; Basic lift-off and slip; Shaking table test; Seismic response;Contact element method.
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目录
封面    1
第1章绪论    6
1.1 引言    6
1.2 国内外研究现状    6
1.3 本文主要研究内容    8
1.3.1 研究目标    8
1.3.2研究计划    9
1.3.3拟采取的技术方案及措施    9
第2章刚性摇摆柱振动台试验    10
2.1试验设备与试样    10
2.1.1 试验设备    10
2.1.2 试样    10
2.2试验工况及实现    10
2.2.1固定刚性地基上刚性柱模型试验    11
2.2.2可提离不可滑移刚性地基上刚性柱模型试验    11
2.2.3可提离可滑移刚性地基上刚性柱试验模型    12
2.3监测方案    12

2.4加载制度    14
2.5试验结果    14
2.5.1固定柱试验工况    15
2.5.2可提离、不可滑移试验工况    17
2.5.3可提离、可滑移试验工况    21
2.6 刚性摇摆结构地震响应特点分析    25
2.6.1提离对结构地震响应的影响分析    26
2.6.2提离与滑移对结构地震响应的影响分析    27
第3章对试验的数值模拟与分析    29
3.1 数值计算模型    29
3.2与试验结果的对比分析    30
3.2.1 固定柱    30
3.2.2可提离不可滑移    32
3.2.3可提离可滑移    33
第4章结论与展望    36
4.1 结论    36
4.2 展望    37
参考文献    38
致谢    40 [资料来源：https://www.doc163.com]