本文關(guān)鍵詞：基于KIK-net強(qiáng)震記錄場地影響的估計(jì)　出處：《蘇州科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： KiK-net強(qiáng)震記錄 放大系數(shù) 校正因子 場地影響系數(shù)

【摘要】：場地放大系數(shù)對(duì)建筑結(jié)構(gòu)抗震設(shè)計(jì)有著重要影響,在第五代《中國地震動(dòng)區(qū)劃圖(GB 18306-2015)》中,增加了考慮場地影響的場地地震動(dòng)峰值加速度調(diào)整系數(shù)aF,《建筑抗震設(shè)計(jì)規(guī)范》GB 50011-2010進(jìn)行局部修訂,編制成的《建筑抗震設(shè)計(jì)規(guī)范》GB 50011-2010(2016年版)也反映這一結(jié)果。一般地,研究場地放大系數(shù)最常用的方法標(biāo)準(zhǔn)譜比法(SSR),即利用土層場地和附近參考基巖場地的強(qiáng)震記錄的譜比獲得。這一方法存在的問題和困難在于:真正的基巖場地很難找到,因?yàn)榛鶐r表面的風(fēng)化層普遍存在,而非�？拷翆訄龅氐膮⒖蓟鶐r場地(都有強(qiáng)震記錄)很少。由于強(qiáng)震動(dòng)記錄受場地條件影響很大,以及收集資料的代表性和廣泛性受到限制,這就使得傳統(tǒng)的SSR不能直接應(yīng)用于在KiK臺(tái)陣覆蓋的區(qū)域而獲得放大因子。同時(shí),對(duì)于每個(gè)臺(tái)站還要考慮震源、傳播途徑和各個(gè)站點(diǎn)場地等因素,每個(gè)鉆孔基巖的深度和各層土介質(zhì)的波速等參數(shù)也存在差異,而且也沒有考慮地震波在土介質(zhì)之間的反射影響,都會(huì)對(duì)傳統(tǒng)的SSR的結(jié)果產(chǎn)生影響。本文對(duì)上述問題進(jìn)行研究,主要研究內(nèi)容如下:1、本文根據(jù)日本KiK-net強(qiáng)震動(dòng)觀測(cè)臺(tái)網(wǎng)2000年1月到2015年12月,震級(jí)高于4.5級(jí),震源深度小于50km,震中距小于100km;并對(duì)每個(gè)數(shù)據(jù)的信噪比進(jìn)行限制,滿足信噪比的數(shù)據(jù)可不做濾波處理;接著對(duì)場地資料的合理性做出判定。最后挑選出102個(gè)臺(tái)站1233組地震記錄為本文的研究工作提供了堅(jiān)實(shí)的基礎(chǔ)。2、采用日本KiK-net臺(tái)站的實(shí)際的地震記錄(GIFH09)和一簡單的場地資料,采用線性化的方法進(jìn)行土層地震響應(yīng)模擬,計(jì)算不同深度的地震動(dòng),并求取不同場地的加速度反應(yīng)譜,從而得出深度校正因子的一般規(guī)律;其次利用8對(duì)KiK-net臺(tái)站的加速度反應(yīng)譜比和Nakamura法(單臺(tái)譜比法)定性的分析出井下基巖譜比BSR_F(地表和井下的傅里葉譜比)大于標(biāo)準(zhǔn)譜比SSR;然后,考慮所有的KiK-net場地地表傳遞函數(shù)TF和基巖的傳遞函數(shù)BTF,并將它們與地表和井下的傅里葉譜比BSR_F進(jìn)行比較。接著,基于上述結(jié)果,計(jì)算并建議一個(gè)簡單而有力的深度校正因子。最后,將8組臺(tái)站的標(biāo)準(zhǔn)譜比SSR、井下基巖BSR_F以及井下基巖譜比深度校正的結(jié)果進(jìn)行比較,發(fā)現(xiàn)深度校正的井下基巖譜比BSRc_F與標(biāo)準(zhǔn)譜比SSR很接近,并可以代替標(biāo)準(zhǔn)譜比SSR來計(jì)算場地的放大系數(shù)。3、根據(jù)國內(nèi)外場地調(diào)整系數(shù)的研究現(xiàn)狀和發(fā)展趨勢(shì)的總結(jié),利用日本KiK-net實(shí)際地震動(dòng)觀測(cè)數(shù)據(jù)統(tǒng)計(jì)規(guī)律,并由上述得出的深度校正因子,采用我國場地分類的標(biāo)準(zhǔn)和國外的研究方法,進(jìn)行我國場地分類標(biāo)準(zhǔn)的場地調(diào)整系數(shù)的研究,并給出場地調(diào)整系數(shù)建議值。
[Abstract]:Site magnification factor plays an important role in seismic design of building structure, in the fifth generation of "China ground motion zoning map GB 18306-2015". The adjustment coefficient of peak acceleration of ground motion considering the influence of site is increased, and the Code for Seismic Design of buildings (GB50011-2010) is locally revised. The Code for aseismic Design of buildings, GB 50011-2010 (2016 Edition), also reflects this result. The most commonly used method for studying site magnification is the standard spectral ratio method (SSRs). The problem and difficulty of this method is that the real bedrock site is difficult to find because the weathering layer on the bedrock surface is ubiquitous. The reference bedrock sites which are very close to the soil site (all have strong earthquake records) are very few. The strong motion records are greatly affected by the site conditions, and the representativeness and universality of the collected data are limited. This makes the traditional SSR can not be directly used in the area covered by KiK array to obtain the amplification factor. At the same time, for each station, we should consider the source, the transmission path and the site of each station and other factors. The depth of each borehole bedrock and the wave velocity of each layer of soil medium are different, and the reflection effect of seismic wave between soil media is not considered. In this paper, the above problems are studied, the main research contents are as follows: 1. According to the KiK-net strong motion observation network of Japan from January 2000 to December 2015, the magnitude of the earthquake is more than 4.5, the focal depth is less than 50km, and the epicenter distance is less than 100km. The signal-to-noise ratio of each data is restricted, and the data satisfying the signal-to-noise ratio can not be filtered. Finally, 102 stations 1233 sets of seismic records are selected to provide a solid foundation for the research work in this paper. Using the actual seismic records of KiK-net station in Japan and a simple site data, the earthquake response of soil layer is simulated by linearization method, and the ground motion at different depths is calculated. The acceleration response spectrum of different sites is obtained, and the general law of depth correction factor is obtained. Secondly, by using the acceleration response spectrum ratio of 8 pairs of KiK-net stations and the Nakamura method (single-station spectral ratio method), the underground bedrock spectrum ratio BSR-F (Fourier spectrum ratio of surface and downhole) is analyzed qualitatively. Greater than the standard spectral ratio (SSRs); Then, the transfer function TF of all KiK-net sites and the transfer function of bedrock are considered and compared with the Fourier spectrum ratio (BSR_F) of surface and underground. Based on the above results, a simple and effective depth correction factor is calculated and recommended. Finally, the standard spectral ratio of eight stations is compared to SSR. By comparing the results of downhole bedrock BSR_F and downhole bedrock spectral ratio correction, it is found that the downhole bedrock spectral ratio (BSRc_F) of depth correction is very close to that of standard spectral ratio (SSR). And can replace the standard spectral ratio SSR to calculate the site magnification factor. 3, according to the domestic and foreign site adjustment factor research status and development trend summary. Based on the statistical law of the actual ground motion observation data of KiK-net in Japan and the depth correction factor obtained above, the standard of site classification in China and the research methods abroad are adopted. The site adjustment coefficient of our country's site classification standard is studied, and the suggested value of site adjustment coefficient is given.
【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
【分類號(hào)】：TU352.11

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 崔昊;丁海平;;基于KiK-net強(qiáng)震記錄的場地調(diào)整系數(shù)估計(jì)[J];地震工程與工程振動(dòng);2016年04期

2 李小軍;;地震動(dòng)參數(shù)區(qū)劃圖場地條件影響調(diào)整[J];巖土工程學(xué)報(bào);2013年S2期

3 薛俊偉;劉偉慶;王曙光;杜東升;;基于場地效應(yīng)的地震動(dòng)特性研究[J];地震工程與工程振動(dòng);2013年01期

4 郭曉云;薄景山;巴文輝;;汶川地震不同場地反應(yīng)譜平臺(tái)值統(tǒng)計(jì)分析[J];地震工程與工程振動(dòng);2012年04期

5 ;Preliminary site classification of free-field strong motion stations based on Wenchuan earthquake records[J];Earthquake Science;2010年01期

6 劉崢;沈建文;石樹中;余湛;;軟土對(duì)基巖峰值加速度的放大作用[J];同濟(jì)大學(xué)學(xué)報(bào)(自然科學(xué)版);2009年05期

7 趙艷;郭明珠;李化明;王文仲;;對(duì)比分析中國有關(guān)場地條件對(duì)設(shè)計(jì)反應(yīng)譜最大值的影響[J];地震地質(zhì);2009年01期

8 張軍華;周振曉;鐘磊;鄭旭剛;單聯(lián)瑜;徐輝;于海鋮;;地震資料信噪比定量計(jì)算及比較[J];油氣地球物理;2008年04期

9 呂悅軍;彭艷菊;蘭景巖;孟小紅;;場地條件對(duì)地震動(dòng)參數(shù)影響的關(guān)鍵問題[J];震災(zāi)防御技術(shù);2008年02期

10 呂紅山;趙鳳新;;適用于中國場地分類的地震動(dòng)反應(yīng)譜放大系數(shù)[J];地震學(xué)報(bào);2007年01期

，

本文編號(hào)：1423272