某框剪结构动力特性测试及地震反应分析

发布时间：2018-05-30 03:12

本文选题：动力测试 + 框-剪结构　；参考：《中国地震局地震研究所》2013年硕士论文

【摘要】：我国是一个地震多发国家，地震中大部分人员伤亡是由房屋及构筑体倒塌所造成的，做好房屋的抗震设防是保障人民生命财产安全的前提。随着高层建筑的不断增多，其结构抗震分析成为一个热点研究问题。实际在役建筑物动力性的测定，对建筑物的抗震设计及其抗震性能的评价具有重要意义。文章以湖北省防震减灾信息综合大楼框架剪力墙结构为研究目标，对其进行结构动力特性测试和有限元抗震性能分析，以期得出一些有益的研究成果。本文首先采用脉动测试方法对结构进行动力特性测试，通过数据频谱分析，确定其模态参数。在动力特性测试的基础上，利用ETABS软件对结构进行模态分析，对比分析二者的结果，并对具体数值差异做出分析。再基于模态分析，对其进行地震反应谱分析和动力时程分析，研究其地震响应性能。文章主要研究内容为： 1.结构动力特性测试。利用固定安装在大楼上的Basalt8X型强震仪器，同步监测环境振动下结构在三个方向上的加速度响应，对加速度数据进行频谱分析，获得结构的前四阶平动振动频率和前两阶扭转振动频率。 2.有限元模态分析。针对已有建筑物、结合设计院提供的图纸，利用ETABS软件建立结构三维有限元模型，进行模态分析，获得结构的自振频率、振型等特性，再与脉动所得结果进行对比，发现测试所得结构自振周期普遍小于有限元分析结果。经分析发现，两者之间的差异主要为：有限元模型参数的选取，如弹性模量等；非结构构件对结构刚度的影响，如填充墙等。 3.结构地震反应分析。选用《武汉市主城规划区地震动参数小区划》中规定的场地类型及地震动参数，进行不同超越概率地震作用下结构的反应谱分析，对楼层刚度、楼层位移、层间位移角等控制因素进行分析，发现该大楼在各个方向刚度比较均匀，受力条件良好，变形满足规范的要求；利用小区划的地震影响系数曲线，，从美国PGMD数据库中筛选五组实际地震波及两组人工波，每个时程工况均输入三个方向的地震波，得到结构响应位移、速度、加速度等时程曲线，各地震波作用下最大基底剪力均大于反应谱法基底剪力的65%，所有时程分析下的基底剪力平均值大于反应谱分析的80%，满足抗震设计规范的要求。反应谱分析和时程分析均显示，该大楼结构构件布置合理、刚度分布比较均匀，抗震性能良好。
[Abstract]:China is an earthquake-prone country. Most of the casualties in the earthquake are caused by the collapse of buildings and structures. It is a prerequisite to ensure the safety of people's lives and property to do a good job of building seismic fortification. With the increasing of high-rise buildings, seismic analysis of their structures has become a hot topic. The measurement of the dynamic property of buildings in service is of great significance to the seismic design of buildings and the evaluation of their seismic performance. This paper takes the frame shear wall structure of earthquake prevention and disaster reduction information complex building in Hubei Province as the research goal, carries on the structural dynamic characteristic test and the finite element seismic performance analysis to it, in order to obtain some beneficial research results. In this paper, the dynamic characteristics of the structure are measured by pulsation test method, and the modal parameters are determined by the data spectrum analysis. On the basis of the dynamic characteristic test, the modal analysis of the structure is carried out by using ETABS software, the results of which are compared and analyzed, and the concrete numerical differences are analyzed. Based on modal analysis, seismic response spectrum analysis and dynamic time history analysis are carried out to study its seismic response performance. The main contents of this paper are as follows: 1. Testing of dynamic characteristics of structures. The acceleration response of the structure in three directions under the environment vibration is monitored synchronously by using the Basalt8X type strong earthquake instrument fixed on the building, and the acceleration data are analyzed in the frequency spectrum. The first four order translational vibration frequency and the first two order torsional vibration frequency of the structure are obtained. 2. Finite element modal analysis. In view of the existing buildings, combined with the drawings provided by the design institute, the three-dimensional finite element model of the structure was established by using ETABS software, and the modal analysis was carried out to obtain the characteristics of the structure, such as the natural vibration frequency, the mode shape, and so on, and then compared with the results obtained by the pulsation. It is found that the natural vibration period of the tested structures is generally smaller than that of the finite element analysis. It is found that the difference between them is the selection of finite element model parameters, such as elastic modulus, and the influence of non-structural members on structural stiffness, such as infilled walls, etc. 3. Structural seismic response analysis. The site types and ground motion parameters specified in "the ground motion parameter subdivision of the main urban planning area of Wuhan" are selected to analyze the response spectrum of the structure under the action of different transcendental earthquakes, and the floor stiffness and floor displacement are analyzed. Through the analysis of the control factors such as interstory displacement angle, it is found that the stiffness of the building is uniform in all directions, the stress condition is good, the deformation meets the requirements of the code, and the seismic influence coefficient curve of the microzonation is used. Five groups of actual earthquakes and two groups of artificial waves were screened from the PGMD database of the United States. The seismic waves in three directions were input into each time-history condition, and the time-history curves of displacement, velocity and acceleration of the structure were obtained. The maximum base shear force under the action of each seismic wave is greater than that of the base shear force of the response spectrum method, and the average value of the base shear force under all time-history analysis is greater than that of the response spectrum analysis, which meets the requirements of the seismic design code. Both the response spectrum analysis and the time history analysis show that the structural members of the building are reasonably arranged, the stiffness distribution is more uniform, and the seismic performance is good.
【学位授予单位】：中国地震局地震研究所
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU311.3;TU398.2

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