本文關(guān)鍵詞：二維復(fù)雜場(chǎng)地土介質(zhì)中阻尼的選取方法　出處：《蘇州科技大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 試驗(yàn)場(chǎng)地 土層地震動(dòng)反演 輸入地震動(dòng) 等效線性化 土介質(zhì)動(dòng)力參數(shù)

【摘要】：伴隨著日益加快的城市現(xiàn)代化進(jìn)程,地震這種突發(fā)性自然災(zāi)害帶來(lái)的損失也日益增加,因此,基于最大限度地減輕地震災(zāi)害帶給人們的損失的目的,大力進(jìn)行地震工程方面的研究顯得尤為必要。大量的震害研究表明,場(chǎng)地條件對(duì)土層地震反應(yīng)有著重大的影響。理論上而言,我們應(yīng)該避免這些不利地形,然而鑒于我國(guó)的基本國(guó)情(國(guó)家人口眾多,土地資源有限)的原因,現(xiàn)實(shí)中很難完全避免這些不利位置,所以對(duì)于復(fù)雜場(chǎng)地地震反應(yīng)的研究顯得很重要。本文根據(jù)土層地震反應(yīng)相關(guān)理論研究方法,借助于日本小田原試驗(yàn)場(chǎng)地相關(guān)參數(shù)模型和強(qiáng)震記錄,文中提出一種復(fù)雜場(chǎng)地中地震波的輸入和土介質(zhì)中阻尼的選取方法,以日本小田原試驗(yàn)場(chǎng)地為算例,進(jìn)行了一維模型和二維模型地震動(dòng)響應(yīng)分析,并與強(qiáng)震記錄對(duì)比。本文得到以下研究結(jié)果:(1)對(duì)于地表強(qiáng)震記錄,根據(jù)實(shí)際地形建立一維土柱模型,采用頻域內(nèi)的有限元方法彈性反演得到基巖基底地震動(dòng)輸入,并與較為常用的輸入(1/2露頭基巖記錄)相比較,兩者結(jié)果差別比較大。一定程度說(shuō)明了小田原試驗(yàn)場(chǎng)地的非線性特征較為明顯。(2)對(duì)于地表強(qiáng)震記錄,根據(jù)實(shí)際地形建立一維土柱模型,采用國(guó)內(nèi)外通用的程序進(jìn)行等效線性化反演得到基巖基底地震動(dòng)輸入,并與理論輸入(1/2露頭基巖記錄)相比較,兩者還是存在差別,但是效果較之于彈性反演而言理想,影響計(jì)算結(jié)果的因素很多,如模型的建立,土介質(zhì)動(dòng)參數(shù)的選取,計(jì)算方法等。(3)在一維線性模型時(shí)域計(jì)算時(shí),本文模型選取保持不變,土介質(zhì)動(dòng)力參數(shù)選取為等效線性化反演最終迭代結(jié)果,計(jì)算得出地震動(dòng)響應(yīng)(加速度時(shí)程曲線、加速度峰值、有效持時(shí)和加速度反應(yīng)譜),并與地表測(cè)量記錄相比較,結(jié)果都吻合的很好。說(shuō)明這種土介質(zhì)動(dòng)力參數(shù)(阻尼比和剪切模量比)的選取,充分考慮到了土體的非線性特征,選取方法是行之有效的。(4)在二維模型計(jì)算時(shí),本文同時(shí)建立三個(gè)二維模型,地震波的輸入分別選取為1/2露頭基巖記錄(理論值),小田原試驗(yàn)場(chǎng)地KS1點(diǎn)等效線性化反演基巖基底地震波,KS2點(diǎn)等效線性化反演基巖基底地震波。土介質(zhì)動(dòng)力參數(shù)(剪切模量比和阻尼比)輸入分別為線性土體本身,兩個(gè)點(diǎn)各自等效線性化迭代后的最終土動(dòng)力參數(shù)。經(jīng)過(guò)模擬計(jì)算,得出本文提出的這種二維修正線性模型相較于二維線性模型更加貼近實(shí)際記錄,也說(shuō)明了本文這種阻尼比選取方法的正確性以及準(zhǔn)確性。
[Abstract]:With the accelerating process of urban modernization, the loss caused by the sudden natural disaster of earthquake is also increasing day by day. Therefore, based on the purpose of minimizing the loss caused by earthquake disaster. It is particularly necessary to make great efforts in seismic engineering. A large number of earthquake damage studies show that site conditions have a significant impact on soil seismic response. Theoretically speaking, we should avoid these adverse terrain. However, in view of the basic situation of our country (the country has a large population, limited land resources), it is difficult to completely avoid these disadvantages in reality. Therefore, it is very important to study the seismic response of complex sites. According to the theoretical research method of soil seismic response, this paper makes use of the relevant parameter model and strong earthquake record of the Ota test site in Japan. In this paper, a method of selecting earthquake wave input and damping in soil media in complex site is proposed. The one-dimensional and two-dimensional model ground motion response analysis is carried out with the example of Ota test site in Japan. Compared with the strong earthquake records, the following results are obtained: 1: 1) for the surface strong earthquake records, a one-dimensional soil column model is established according to the actual topography. Using the finite element method in frequency domain, the ground motion input of bedrock basement is obtained by elastic inversion, and compared with the more commonly used input 1 / 2 outcrop bedrock record. The difference between the two results is quite big. To a certain extent, it shows that the nonlinear characteristics of the field are obvious. (2) for the surface strong earthquake records, a one-dimensional soil-column model is established according to the actual terrain. The equivalent linearization inversion program is used to obtain the ground motion input of bedrock basement, and compared with the theoretical input 1 / 2 outcrop bedrock record, there is still a difference between them. However, the effect is better than that of elastic inversion, and there are many factors that affect the calculation results, such as the establishment of model, the selection of dynamic parameters of soil media, the calculation method, etc.) in the time domain calculation of one-dimensional linear model. In this paper, the model selection remains unchanged, the soil dynamic parameters are selected as equivalent linearization inversion of the final iterative results, and the ground motion response (acceleration time history curve, acceleration peak value) is calculated. The effective duration and acceleration response spectrum are in good agreement with the surface measurements. The results show that the dynamic parameters (damping ratio and shear modulus ratio) of the soil are selected. Taking fully into account the nonlinear characteristics of soil, the selection method is effective. 4) in the two-dimensional model calculation, this paper establishes three two-dimensional models at the same time. The input of seismic wave is selected as 1/2 outcrop bedrock record (theoretical value) and equivalent linearization of KS1 point in Ota original test site for inversion of bedrock basement seismic wave. The equivalent linearization of KS2 point is used to invert the seismic waves of bedrock basement. The input of soil dynamic parameters (shear modulus ratio and damping ratio) is linear soil itself. The final soil dynamic parameters of the two points are equivalent linearization iteration. Through simulation and calculation, it is concluded that the two-dimensional modified linear model proposed in this paper is closer to the actual record than the two-dimensional linear model. It also shows the correctness and accuracy of the damping ratio selection method in this paper.
【學(xué)位授予單位】：蘇州科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU435

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