【摘要】：我國(guó)領(lǐng)土面積廣闊、人口眾多,隨著現(xiàn)代化的發(fā)展,電力需求逐步擴(kuò)大。輸電塔線體系作為能源傳送的載體,在國(guó)家經(jīng)濟(jì)發(fā)展中占據(jù)著重要的地位,其正常工作是確保人們正常生產(chǎn)生活的基本條件。我國(guó)作為地震頻發(fā)的國(guó)家之一,地震導(dǎo)致的輸電塔線體系倒塌破壞現(xiàn)象屢見(jiàn)不鮮,嚴(yán)重阻礙災(zāi)后救援工作的開(kāi)展。輸電塔線結(jié)構(gòu)作為典型的大跨越空間結(jié)構(gòu),其地震響應(yīng)十分復(fù)雜,已有眾多研究表明,進(jìn)行此類(lèi)結(jié)構(gòu)的抗震研究時(shí)有必要考慮地震波空間變化效應(yīng)的影響。因此,對(duì)空間變化地震動(dòng)激勵(lì)下輸電塔線體系的倒塌進(jìn)行研究,具有重要的科學(xué)意義與實(shí)際價(jià)值。本文以500kV輸電塔線體系為研究對(duì)象,基于有限元軟件ABAQUS,采用動(dòng)力顯式分析對(duì)空間變化地震動(dòng)激勵(lì)下輸電塔線體系的倒塌破壞進(jìn)行了模擬研究,主要完成了以下幾個(gè)方面的研究工作。(1)基于基巖功率譜和相干函數(shù),模擬生成了考慮場(chǎng)地條件的空間變化地震動(dòng)。利用基巖與土層的剛度矩陣,通過(guò)基巖處輸入地震動(dòng)計(jì)算得到地表的加速度時(shí)程,通過(guò)比較功率譜和相干函數(shù)的吻合程度,驗(yàn)證了研究成果的準(zhǔn)確性。(2)利用試驗(yàn)與有限元相結(jié)合的分析方法對(duì)角鋼構(gòu)件的滯回性能進(jìn)行了研究�；谛滦弯摬谋緲�(gòu)Tian-Ma-Qu模型,對(duì)往復(fù)荷載作用下的角鋼試驗(yàn)結(jié)果進(jìn)行了模擬,并將試驗(yàn)及Riks分析結(jié)果引入到ABAQUS用戶(hù)子程序中,程序可用于后續(xù)空間變化地震動(dòng)激下勵(lì)的輸電塔線體系倒塌模擬分析。(3)基于振動(dòng)臺(tái)試驗(yàn)結(jié)果,對(duì)非一致地震激勵(lì)下大跨越輸電塔線體系的地震響應(yīng)進(jìn)行研究�；谀M生成的考慮地震波空間變化特性的地震動(dòng)時(shí)程,分別對(duì)輸電塔線體系進(jìn)行一致激勵(lì)與非一致激勵(lì)。分別研究行波效應(yīng)、相干效應(yīng)和局部場(chǎng)地效應(yīng)對(duì)結(jié)構(gòu)響應(yīng)的影響。(4)基于有限元軟件,對(duì)不同地震波激勵(lì)形式下輸電塔的層間位移角及倒塌破壞過(guò)程進(jìn)行研究;基于考慮角鋼桿件滯回性能的用戶(hù)子程序,研究了多維一致輸入與多維多點(diǎn)輸入下輸電塔線結(jié)構(gòu)的倒塌破壞過(guò)程,對(duì)不同激勵(lì)方式下結(jié)構(gòu)的桿件失穩(wěn)、層間位移角及結(jié)構(gòu)薄弱位置進(jìn)行了對(duì)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.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM75

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