【摘要】：高層建筑是我國(guó)城市中辦公、住宅等建筑的主要結(jié)構(gòu)形式,其抗震安全性對(duì)于保護(hù)人民生命財(cái)產(chǎn)的安全具有重要的意義。本文在系統(tǒng)概述我國(guó)高層建筑結(jié)構(gòu)發(fā)展、結(jié)構(gòu)抗震分析方法以及多維地震動(dòng)研究等方面的基礎(chǔ)上,開展了不同類型多維地震動(dòng)輸入下的高層建筑結(jié)構(gòu)的地震響應(yīng)分析,主要工作如下:(1)根據(jù)不同類型地震波的選取依據(jù),從世界地震記錄數(shù)據(jù)庫(kù)中選取了相應(yīng)場(chǎng)地類別的普通遠(yuǎn)場(chǎng)地震波、脈沖型近斷層地震波和無(wú)脈沖型近斷層地震波等三種不同類型的地震動(dòng)實(shí)測(cè)記錄,通過(guò)比較三種類型地震波的速度時(shí)程曲線、傅里葉幅值譜和反應(yīng)譜曲線,對(duì)比分析了不同類型地震動(dòng)的工程特性。分析表明:脈沖型地震波中存在顯著的速度脈沖;近斷層地震波豎向分量在高頻段比遠(yuǎn)場(chǎng)地震波豐富;普通遠(yuǎn)場(chǎng)和脈沖型地震波在周期較長(zhǎng)部分較豐富,加速度放大系數(shù)隨周期的增大衰減較慢,而無(wú)脈沖型地震波能量主要集中在高頻段;遠(yuǎn)場(chǎng)地震波由于豎向分量衰減更快,在標(biāo)準(zhǔn)加速度反應(yīng)譜曲線中豎向分量明顯小于兩水平分量,說(shuō)明當(dāng)震中距較小時(shí),應(yīng)重視豎向分量可能對(duì)結(jié)構(gòu)動(dòng)力響應(yīng)的不利影響。(2)依據(jù)合成轉(zhuǎn)動(dòng)分量的基本理論計(jì)算了不同類型地震動(dòng)的轉(zhuǎn)動(dòng)分量,并分析其工程特性。分析表明:與平動(dòng)分量類似,脈沖型近斷層地震波的轉(zhuǎn)動(dòng)分量也存在比較明顯的速度脈沖;而遠(yuǎn)場(chǎng)和其他近斷層地震波的脈沖現(xiàn)象則不明顯;同一個(gè)地震波的兩搖擺分量的傅里葉幅值譜曲線較類似,而與扭轉(zhuǎn)分量的差別較大;搖擺分量的頻率成分更集中于高頻段,卓越頻率更高;相比于平動(dòng)分量,轉(zhuǎn)動(dòng)分量在高頻范圍內(nèi)的成分更豐富,頻帶較寬,隨頻率的增大衰減較緩慢;搖擺分量的角加速度放大系數(shù)大于扭轉(zhuǎn)分量,扭轉(zhuǎn)分量的卓越周期更高,角加速度放大系數(shù)的平臺(tái)段更明顯。(3)建立了高層建筑結(jié)構(gòu)的有限元分析模型,以不同類型多維地震動(dòng)為輸入,計(jì)算了不同工況下結(jié)構(gòu)的動(dòng)力時(shí)程響應(yīng),并總結(jié)其影響規(guī)律。計(jì)算結(jié)果表明:轉(zhuǎn)動(dòng)分量引起結(jié)構(gòu)的頂層加速度和位移反應(yīng)較大;轉(zhuǎn)動(dòng)分量引起的結(jié)構(gòu)加速度反應(yīng)的頻率較高;相對(duì)于普通遠(yuǎn)場(chǎng)地震波,近斷層地震動(dòng)轉(zhuǎn)動(dòng)分量對(duì)結(jié)構(gòu)位移響應(yīng)的影響更大;脈沖型地震波引起的結(jié)構(gòu)頂點(diǎn)位移反應(yīng)比另兩種類型地震波的大很多;脈沖型地震波引起的結(jié)構(gòu)角柱柱端剪力和彎矩響應(yīng)峰值比普通遠(yuǎn)場(chǎng)和普通近斷層地震波的大;普通遠(yuǎn)場(chǎng)地震波轉(zhuǎn)動(dòng)分量作用時(shí),柱端剪力和彎矩略有減小,而近斷層地震波輸入時(shí)轉(zhuǎn)動(dòng)分量的影響較大;脈沖型地震波作用時(shí)的結(jié)構(gòu)底層柱內(nèi)力遠(yuǎn)大于另外兩種類型的地震波;高層建筑結(jié)構(gòu)地震響應(yīng)與地震波的類型以及輸入的不同分量都有較大關(guān)系,為確保高層建筑結(jié)構(gòu)的抗震安全性,有必要考慮兩者對(duì)結(jié)構(gòu)地震作用的不利影響。
[Abstract]:High-rise building is the main structural form of office and residential buildings in our country, and its seismic safety is of great significance to protect the safety of people's life and property. On the basis of a systematic overview of the development of high-rise building structures in China, the seismic analysis methods of structures and the study of multi-dimensional ground motion, the seismic response analysis of high-rise building structures with different types of multi-dimensional ground motion input is carried out in this paper. The main works are as follows: (1) based on the selection of different types of seismic waves, the ordinary far-field seismic waves of corresponding site types are selected from the world seismic record database. Three different types of ground motion measurements, such as pulse near fault seismic wave and non pulse near fault ground seismic wave, were recorded. By comparing the velocity history curve, Fourier amplitude spectrum and response spectrum curve of three kinds of seismic waves, The engineering characteristics of different types of ground motions are compared and analyzed. The analysis shows that there are significant velocity pulses in the pulsed seismic waves and that the vertical components of the near-fault seismic waves are more abundant than those of the far-field seismic waves in the high frequency range. The ordinary far field and pulse seismic wave are abundant in the long period, and the acceleration magnification coefficient attenuates slowly with the increase of the period, while the energy of the non pulse type seismic wave is mainly concentrated in the high frequency range. The attenuation of far-field seismic wave due to vertical component is faster, and the vertical component in the standard acceleration response curve is obviously smaller than that of two horizontal components, which indicates that when the epicentral distance is small, Attention should be paid to the possible adverse effects of vertical components on the dynamic response of structures. (2) based on the basic theory of composite rotational components, the rotational components of different types of ground motions are calculated and their engineering characteristics are analyzed. The analysis shows that, similar to the translational component, the rotational component of the pulsed near-fault seismic wave also has obvious velocity pulse, but the pulse phenomenon of the far-field and other near-fault seismic waves is not obvious. The Fourier amplitude spectrum curve of the two rocking components of the same seismic wave is similar to that of the torsional component, and the frequency component of the rocking component is more concentrated in the high frequency band and the superior frequency is higher. Compared with the translational component, the rotational component is more abundant in the high frequency range, the frequency band is wider, and the attenuation is slower with the increase of the frequency. The angular acceleration magnification factor of the rocking component is larger than that of the torsional component, the excellent period of the torsional component is higher, and the platform segment of the angular acceleration magnification factor is more obvious. (3) the finite element analysis model of high-rise building structure is established. Taking different types of multi-dimensional ground motion as input, the dynamic time-history response of structures under different working conditions is calculated and its influence law is summarized. The results show that the top acceleration and displacement response of the structure caused by the rotational component is larger, the frequency of the structural acceleration response caused by the rotational component is higher. Compared with the conventional far-field seismic waves, the rotational components of near-fault ground earthquakes have a greater effect on the structural displacement response, and the structural vertex displacement response caused by the impulsive seismic waves is much larger than that of the other two types of seismic waves. The peak value of shear force and moment response at the end of corner column caused by impulse seismic wave is larger than that of normal far field and common near fault ground seismic wave. The shear force and bending moment at the end of the column decrease slightly under the action of the rotational component of the ordinary far-field seismic wave, but the rotational component has a great effect on the input of the near-fault seismic wave. The internal force of the bottom column of the structure is much larger than that of the other two types of seismic waves. The seismic response of high-rise building structure is closely related to the type of seismic wave and the different input components. In order to ensure the seismic safety of high-rise building structure, it is necessary to consider their adverse effects on the seismic action of the structure.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU973.31

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