空间变化地震动下输电塔—线体系倒塌机理研究

发布时间：2018-12-31 17:30

【摘要】：我国领土面积广阔、人口众多,随着现代化的发展,电力需求逐步扩大。输电塔线体系作为能源传送的载体,在国家经济发展中占据着重要的地位,其正常工作是确保人们正常生产生活的基本条件。我国作为地震频发的国家之一,地震导致的输电塔线体系倒塌破坏现象屡见不鲜,严重阻碍灾后救援工作的开展。输电塔线结构作为典型的大跨越空间结构,其地震响应十分复杂,已有众多研究表明,进行此类结构的抗震研究时有必要考虑地震波空间变化效应的影响。因此,对空间变化地震动激励下输电塔线体系的倒塌进行研究,具有重要的科学意义与实际价值。本文以500kV输电塔线体系为研究对象,基于有限元软件ABAQUS,采用动力显式分析对空间变化地震动激励下输电塔线体系的倒塌破坏进行了模拟研究,主要完成了以下几个方面的研究工作。(1)基于基岩功率谱和相干函数,模拟生成了考虑场地条件的空间变化地震动。利用基岩与土层的刚度矩阵,通过基岩处输入地震动计算得到地表的加速度时程,通过比较功率谱和相干函数的吻合程度,验证了研究成果的准确性。(2)利用试验与有限元相结合的分析方法对角钢构件的滞回性能进行了研究。基于新型钢材本构Tian-Ma-Qu模型,对往复荷载作用下的角钢试验结果进行了模拟,并将试验及Riks分析结果引入到ABAQUS用户子程序中,程序可用于后续空间变化地震动激下励的输电塔线体系倒塌模拟分析。(3)基于振动台试验结果,对非一致地震激励下大跨越输电塔线体系的地震响应进行研究。基于模拟生成的考虑地震波空间变化特性的地震动时程,分别对输电塔线体系进行一致激励与非一致激励。分别研究行波效应、相干效应和局部场地效应对结构响应的影响。(4)基于有限元软件,对不同地震波激励形式下输电塔的层间位移角及倒塌破坏过程进行研究;基于考虑角钢杆件滞回性能的用户子程序,研究了多维一致输入与多维多点输入下输电塔线结构的倒塌破坏过程,对不同激励方式下结构的杆件失稳、层间位移角及结构薄弱位置进行了对比分析。
[Abstract]:China has a vast territory and a large population. With the development of modernization, the demand for electricity is gradually expanding. As a carrier of energy transmission, transmission tower system plays an important role in the national economic development, and its normal work is the basic condition to ensure people's normal production and life. As one of the countries with frequent earthquakes, the collapse and destruction of transmission tower system caused by earthquake is common, which seriously hinders the development of post-disaster rescue work. As a typical long-span space structure, the seismic response of transmission tower line structure is very complex. Many studies have shown that it is necessary to consider the effect of seismic wave spatial variation in seismic research of this kind of structure. Therefore, it is of great scientific significance and practical value to study the collapse of transmission tower system under the excitation of spatially varying ground motion. In this paper, the 500kV transmission tower system is taken as the research object, and the dynamic explicit analysis based on the finite element software ABAQUS, is used to simulate the collapse and failure of the transmission tower system under spatially varying ground motion excitation. The main works are as follows: (1) based on the power spectrum of bedrock and coherence function, the spatial variation ground motion considering the site condition is simulated. By using the stiffness matrix of bedrock and soil layer, the acceleration time history of the ground surface is calculated by the input of ground motion at the bedrock. By comparing the power spectrum with the coherence function, the degree of agreement between the ground acceleration time history and the coherence function is obtained. The accuracy of the research results is verified. (2) the hysteretic behavior of angle steel members is studied by means of the analysis method of the combination of test and finite element method. Based on the new steel constitutive Tian-Ma-Qu model, the angle steel test results under reciprocating load are simulated, and the test and Riks analysis results are introduced into the ABAQUS user subprogram. The program can be used to simulate and analyze the collapse of transmission tower system excited by ground motion. (3) based on the results of shaking table test, the seismic response of large-span transmission tower system under non-uniform earthquake excitation is studied. Based on the time-history of ground motion generated by simulation considering the spatial variation of seismic wave, the transmission tower system is subjected to uniform excitation and non-uniform excitation respectively. The effects of traveling wave effect, coherent effect and local site effect on the structure response are studied respectively. (4) based on finite element software, the interstory displacement angle and collapse failure process of transmission tower under different seismic wave excitation forms are studied. Based on the user subroutine considering the hysteretic performance of angle steel bar, the collapse and failure process of transmission tower structure under multi-dimensional uniform input and multi-dimensional multi-point input is studied, and the member instability of the structure under different excitation modes is studied. The interstory displacement angle and the weak position of the structure are compared and analyzed.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75

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