多层木-混凝土混合结构的层间隔震研究
多层木-混凝土混合结构的层间隔震研究(任务书,开题报告,外文翻译,论文17000字)
摘要
国内对轻木—混凝土混合结构的抗震性能研究仍处于起步阶段，对其抗震设计仍沿用了传统的“以刚克刚”的抗震方法，未能从根本解决刚度突变造成的连接处大破坏问题。为了解决这一问题，本文采用一种新的研究思路：在轻木结构与混凝土结构间加入隔震层，形成层间隔震结构，耗散地震能量，减少地震向上部结构的传递作用。本文借助有限元分析软件ANSYS分别建立轻木—混凝土混合结构和轻木—混凝土层间隔震结构，进行地震响应分析，对比分析层间隔震层隔震效果。研究成果如下：
（1）对上部轻木结构和层间隔震层进行简化，分别建立轻木—混凝土混合结构和轻木—混凝土层间隔震结构的有限元模型；
（2）分别对原结构和层间隔震结构进行了模态分析，得到了结构的前十阶基本自振频率、周期与振型，对比分析可得隔震支座的设置可增大结构自振周期，当隔震层在地震作用下产生滑移后，刚度减小，可明显延长结构周期，发挥隔震作用；
（3）分别对原轻木—混凝土混合结构和轻木—混凝土层间隔震结构输入El centro地震波，分析其在在多遇、设防、罕遇烈度下水平地震响应，得到结构各层加速度及水平位移时程曲线，结构最大层间位移与各层相对加速度峰值图表。分析结果表明：隔震支座的设置可同时提高上部轻木结构与下部混凝土框架结构的抗震性能，其中对轻木结构抗震性能提升效果更佳：层间最大侧移与加速度峰值平均减少约20%~30%，很好地发挥了隔震耗能的作用。 [版权所有：http://DOC163.com]
关键词：轻木—混凝土混合结构，层间隔震，ANSYS，模态分析，地震响应分析
Abstract
The domestic research on seismic performance of light wood-concrete hybrid structure is still in its infancy. The traditional method improving the structures’stiffness is still used in its seismic design, which fails to fundamentally solve the problem of large joint damage caused by stiffness mutation. In order to solve this problem, this paper adopts a new method: adding a interlayerseismicisolation structure between the balsa-wood structure and the concrete structure, dissipating seismic energy and reducing the transmission of the earthquake to the upper part. The finite element analysis software ANSYS is used to establish the light wood-concrete hybrid structure and the light wood-concrete layer isolation structure in the essay, and the seismic response analysis is carried out to compare and analyze the isolation effect of the interlayerseismicisolation structure. The results are as follows:
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(1) Simplifying the upper light wood structure and the interlayerseismicisolation structure, respectively establishing a light wood-concrete mixed structure and a light wood-concrete interlayerseismicisolation structure model;
(2) Respectively performingmodal analysis on the original structure and the isolated structure. The first ten-order basic natural vibration frequency, period and the modes of the structure are obtained. The comparative analysis shows that the setting of the interlayerseismicisolation structure can increase the natural vibration period of the structure.When the isolated structure is slipped under the action of earthquake, the stiffness is reduced, which can significantly prolong the structural period and exert the isolation effect;
(3) Respectively inputting the time history curve of the El centro seismic wavefor the original light wood-concrete hybrid structure and the light wood-concrete interlayerseismicisolation structure. According to the analysis of the response under the multiple intensity, fortification intensity and rare intensity, the time-history curves of the lateral shiftand acceleration of each layer are obtained, and the maximum interlayer displacement and the absolute acceleration peak of each layer are compared and analyzed. According to the analysis, the interlayerseismicisolation structure can improve the seismic performance of the upper light wood structure and the lower concrete frame structure, and the seismic performance improvement of the light wood structure is better: the maximum lateral displacement and acceleration peaks between the layers are reduced about 20% to 30%.Its isolation effect is good. [资料来源：http://Doc163.com]
Key word：lightwood-concrete hybrid structure,story isolation,ANSYS,modal analysis, seismic dynamic analysis
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目录
摘要 I
Abstract II
第1章绪论 1
1.1. 研究的目的和意义 1
1.2. 国内外研究现状 2
1.2.1. 轻木-混凝土混合结构在国外的发展 2
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1.2.2. 轻木-混凝土混合结构在国内的发展 3
1.3. 本文的研究思路和主要内容 4
1.3.1. 研究思路 4
1.3.2. 主要内容 4
第2章轻木-混凝土层间隔震结构体系有限元模型 5
2.1. 引言 5
2.2. 工程概况 5
2.3. 轻木-混凝土混合结构模型 7
2.3.1. 底层混凝土框架模型 7
2.3.2. 上部轻木结构模型 9
2.4. 轻木-混凝土层间隔震结构模型 12
2.5. 有限元模型建立 14
2.6. 本章小结 15
第3章模态分析 16
3.1. 引言 16
3.2. 模态分析 16 [资料来源：https://www.doc163.com]
3.3. 本章小结 18
第4章地震响应时程分析 19
4.1. 引言 19
4.2. 时程分析法 19
4.3. 地震波的选取 20
4.4. 多遇烈度下的地震响应分析 20
4.5. 设防烈度下的地震响应时程分析 26
4.6. 罕遇烈度下的地震响应分析 31
4.7. 本章小结 36
第5章结论与展望 38
5.1. 结论 38
5.2. 展望 38
参考文献 40
致谢 42