带地下室结构与地下结构地震响应相互的影响分析(任务书,开题报告,论文16000字)
摘要
随着社会的高速发展,城市空间的使用日益受到人们的关注,近年来,城市的发展也逐步转入对地下空间的开发利用的方向。受限于有限的城市地下空间,实际 工程中涉及到城市地下管网和地下结构近距离穿越地表结构的实例越来越多,地下结构经常与邻近的地表建筑物基础发生相对性的穿越,在城市建设与发展过程中,地表结构与地下结构必将发生复杂的相互作用效应。各类地下结构的存在破坏了土体的整体性，特别是带地下室的地表结构。地下室的底板在高度上与地下结构的顶板持平或更低，在地震时地下结构-土体-地表结构构成了一个复杂的相互作用体系，因此极有必要考察地震时二者的相互影响规律。
本文构建带地下室的地上结构-土体-地下结构模型，进行整体性二维计算分析，综合考虑地下室层数及尺寸、土层参数、地表结构与地下车站的相对位置、地震波特性因素，探讨地震响应相互影响规律，为工程结构的抗震设计提供参考。基于对本文计算数据的对比和分析，可得如下相互影响规律：
带地下室的地表结构对土体的影响：
①地下室深度和宽度增加，能够增大周围土体的地震响应；
②地下室对土体的影响范围与地下室尺寸有关。
（2）带地下室地地表结构对地下结构的影响
①地下室能够增大地下结构的地震响应；
②地下室尺寸越大，地下结构的地震响应越大，其中深度是硬土工况下的主要影响因素，宽度是软土工况下的主要影响因素
（3）地下结构对地表结构的影响：
①地下结构对地表结构的响应有放大作用，输入EL波和Kobe波时都能够放大地表结构的响应；
②地下结构在硬土场地中对地表结构的影响显著大于软土场地。
（4）地下结构对土体的影响：
地下结构会整体放大周围土体的地震响应。
（5）地表结构-地下结构横向净距的影响：
净距在一倍地表建筑宽度范围内时，地表结构和地下结构的地震响应随净距的增大而减少。超过一倍地表建筑物宽度范围时，结构地震响应程度与净距关系不大。
（6）土体对结构的影响
①土体类型对地下结构的地震响应会造成较大的影响；
②地表以下的结构在软中的响应较大，地表以上的结构在硬土中的响应较大。
关键词：地表结构；地下结构；地下室；相互作用；地震响应
Abstract
With the rapid development of society, the use of urban space is increasingly concerned by people. In recent years, China gradually attaches importance to the development and the utilization of underground space. Because of the number of underground lines ,and the restriction of underground space resources, more and more underground structure often goes across from the bottom of foundation or from the ground structure closely, which will cause the complex interaction effect. The existence of various underground structures destroys the integrity of soil, especially the surface structure with underground stories. The basement floor is equal to or lower than the roof of the underground structure at high altitude. The underground structure-soil-surface structure constitutes a complex interaction system during the earthquake. Therefore, it is necessary to research the law of interaction between them under the earthquake`s effect.
This paper use the way of building the ground structure-soil-underground structure models, and two-dimensional modeling calculation methods. Considering the basement size, soil parameters, the ground structure and the relative position of the underground station, seismic wave characteristics. Meanwhile, this paper will analysis the effects of several factors on seismic responses of the whole system, discuss seismic response influences, so as to provide the reference for the seismic design of engineering structure , reinforcement and reconstruction. Based on the comparison and analysis of the calculated data in this paper, the following interaction rules can be obtained:
(1) The influence of the surface structure with a basement on the soil:
① The depth and width of the basement increase, which can increase the seismic response of the surrounding soil;
② The influence of the basement on the soil is related to the size of the basement.
(2) Influence of surface structure with basement on underground structure
① The basement can increase the seismic response of the underground structure;
② The larger the size of the basement, the greater the seismic response of the underground structure. The depth is the main influencing factor under hard soil conditions, and the width is the main influencing factor under soft soil conditions.
(3) Impact of underground structure on surface structure:
① The underground structure has a magnified response to the surface structure, and both the EL wave and the Kobe wave can amplify the response of the surface structure;
② The influence of the underground structure on the surface structure in the hard soil site is significantly greater than that in the soft soil site.
(4) Influence of underground structure on soil:
The underground structure will amplify the seismic response of the surrounding soil as a whole.
(5) Surface structure - the effect of the lateral clearance of the underground structure:
When the net distance is within the width of the surface of the building, the seismic response of the surface structure and the underground structure decreases as the clearance increases. When the width of the surface of the building is more than doubled, the degree of seismic response of the structure has little to do with the clearance.
(6) Influence of soil on structure
① The soil type will have a greater impact on the seismic response of the underground structure;
② The structure below the surface has a large response in soft, and the structure above the surface has a large response in hard soil.
Keywords: Ground structures; underground structure; underground stories; interaction system; seismic response
目录
摘要 I
Abstract III
第一章 绪论 1
1.1 研究背景和意义 1
1.2 国内外研究现状 1
1.3 主要研究内容 3
1.4 主要研究方案 3
第二章 计算模型 5
2.1 本构模型及参数 5
2.2 计算范围 8
2.3 单元类型及网格划分 9
2.4 边界条件 9
2.5 阻尼设置 10
2.6 地震动输入和动力时步设置 11
2.8 测点设置 12
第三章 计算结果分析 15
3.1 模态分析 15
3.2 动力响应分析 16
3.2.1地下室的影响分析 16
3.2.1.1不同地下室结构对场地土的影响 16
3.2.1.2不同地下室结构对地铁车站的影响 18
3.2.1.3小结 19
3.2.2地铁车站的影响分析 19
3.2.2.1地铁车站对地表结构的影响 20
3.2.2.2地铁车站对土体的影响 21
3.2.2.3 小结 23
3.2.3地表结构—地铁车站横向净距的影响分析 23
3.2.3.1结构横向净距对地铁车站的影响 23
3.2.3.2结构横向净距对地表结构的影响 24
3.2.3.3小结 25
3.2.4不同类型土体的影响分析 25
3.2.4.1土体对地表结构的影响 26
3.2.4.2土体对地下结构的影响 27
3.2.4.4小结 28
第四章 结论与展望 29
4.1结论 29
4.2展望 29
参考文献 31 |
