地裂场地上带板式转换高层建筑结构的抗震性能分析

发布时间：2018-06-29 05:20

本文选题：板式转换层 + 地裂场地　；参考：《长安大学》2017年硕士论文

【摘要】：由非地震地裂缝引发的地面不均匀沉降对各类建筑结构带来巨大危害。在实际工程中,现有规程对地裂缝的影响主要采取空间避让措施,即根据建筑物的结构形式、安全等级,所处位置(上、下盘)设定一个最小避让距离;板式转换层作为高层建筑转换结构的重要形式,其优点是下部结构柱网可以灵活布置,无须与上层结构对齐。但由于转换厚板集中了相当大的质量与刚度,使得转换层处结构上、下层竖向刚度发生突变,容易形成薄弱层,对抗震极为不利。本文在现有研究基础上,研究地裂场地上带板式转换框支结构抗震性能,以论证高位转换在7度抗震设防区内地裂场地上的可行性,并在此基础上探索将规程规定的地裂缝影响区最小避让距离缩短的可能性,以期为实际工程应用提供参考与借鉴。本文完成的主要工作有:(1)以原设计在6度抗震设防区的河南洛阳宏业广场高层住宅这一实际工程为例,重新在7度抗震设防区内普通场地(避让距离不小于最小避让距离)上利用有限元软件对结构进行模态分析、反应谱分析、弹性动力时程分析,静力弹塑性分析等相关主要工作;(2)为研究板式转换层设置位置对结构抗震性能的影响,分别将转换厚板设置在2层、4层、6层顶,将这3种模型分别从自振周期、结构侧移、层间位移及层间位移角、结构内力变化等角度进行对比分析;(3)以宏业广场高层住宅为算例,在7度抗震设防区内地裂场地(避让距离小于最小避让距离)上研究结构层间位移、层间位移角以及内力随避让距离减小的变化规律,并将其与在普通场地上(仅考虑地震作用)的层间位移、层间位移角以及内力进行对比分析,在此基础上求得最合理的避让距离。通过研究发现:(1)以宏业广场高层住宅这一工程实例具体研究分析来看,其在7度抗震设防区内普通场地上结构抗震性能指标依旧满足规范要求;(2)通过3种模型对比分析发现,随着转换层位置的提高,结构的自振周期、层间位移及层间位移角,结构内力呈现一定的规律变化。并证明高位转换在7度抗震设防区具有可行性,但须对薄弱层进行适度加强;(3)地基不均匀沉降对结构的抗震性能的影响较为显著,在实际工程中应引起重视,合理的避让距离仍待进一步研究。
[Abstract]:The uneven settlement caused by non-seismic ground fissures brings great harm to all kinds of building structures. In actual engineering, the influence of existing regulations on ground fissures is mainly taken space avoiding measures, that is, according to the structure form of the building, safety grade, the location (upper, lower) set a minimum avoiding distance; As an important form of high rise building transfer structure, the plate transfer layer has the advantage that the column network of the lower structure can be arranged flexibly without alignment with the upper structure. However, due to the large mass and stiffness of the transfer thick plate, the vertical stiffness of the lower layer changes on the transfer floor, which makes it easy to form a weak layer, which is extremely unfavorable to the earthquake resistance. On the basis of the existing research, this paper studies the seismic behavior of the structure with slab transfer frame support on the ground fissure site to prove the feasibility of the high level conversion on the ground crack site in the 7 degree seismic fortification area. On this basis, the possibility of shortening the minimum circumvention distance of the affected area of ground fissures stipulated by the regulations is explored, in order to provide reference and reference for practical engineering application. The main works of this paper are as follows: (1) take the actual project of the high-rise residence of Hongye Square in Luoyang, Henan Province, which was originally designed in the 6 degree seismic fortification area, as an example. The modal analysis, response spectrum analysis, elastic dynamic time-history analysis of the structure are carried out on the normal site of 7 degree seismic fortification area (the avoiding distance is not less than the minimum avoiding distance) by using the finite element software. (2) in order to study the influence of the location of the plate transfer layer on the seismic performance of the structure, the transfer thick plate was set at the top of 2 or 4 stories and 6 stories, respectively, and the three models were shifted from the natural vibration period to the side of the structure, respectively, in order to study the influence of the location of the plate transfer layer on the seismic performance of the structure. (3) taking Hongye Square high-rise residence as an example, the displacement of the structure is studied on the ground crack site in the 7 degree seismic fortification area (the avoiding distance is less than the minimum distance). The variation of interstory displacement angle and internal force with the decrease of avoiding distance is compared with the interstory displacement, interstory displacement angle and internal force on the common site (only considering earthquake action). On this basis, the most reasonable distance to avoid. It is found that: (1) the concrete research and analysis of Hongye Square high-rise residence shows that the seismic performance index of the structure on the ordinary site in the 7 degree seismic fortification area still meets the requirements of the code; (2) through the comparative analysis of three models, it is found that, With the increase of the position of the transfer layer, the natural vibration period, interstory displacement and interstory displacement angle of the structure, and the internal force of the structure show a certain law change. It is proved that high level conversion is feasible in 7 degree seismic fortification area, but the weak layer should be strengthened moderately. (3) the influence of uneven settlement of foundation on seismic performance of structure is obvious, which should be paid more attention to in practical engineering. The reasonable distance of avoidance still needs further study.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU973.31

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