本文關(guān)鍵詞：基于KIK-net強(qiáng)震記錄場地影響的估計　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)對建筑結(jié)構(gòu)抗震設(shè)計有著重要影響,在第五代《中國地震動區(qū)劃圖(GB 18306-2015)》中,增加了考慮場地影響的場地地震動峰值加速度調(diào)整系數(shù)aF,《建筑抗震設(shè)計規(guī)范》GB 50011-2010進(jìn)行局部修訂,編制成的《建筑抗震設(shè)計規(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,因為基巖表面的風(fēng)化層普遍存在,而非常靠近土層場地的參考基巖場地(都有強(qiáng)震記錄)很少。由于強(qiáng)震動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臺陣覆蓋的區(qū)域而獲得放大因子。同時,對于每個臺站還要考慮震源、傳播途徑和各個站點場地等因素,每個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,都會對傳統(tǒng)的SSR的結(jié)果產(chǎn)生影響。本文對上述問題進(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)震動觀測臺網(wǎng)2000年1月到2015年12月,震級高于4.5級,震源深度小于50km,震中距小于100km;并對每個數(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;接著對場地資料的合理性做出判定。最后挑選出102個臺站1233組地震記錄為本文的研究工作提供了堅實的基礎(chǔ)。2、采用日本KiK-net臺站的實際的地震記錄(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,計算不同深度的地震動,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KiK-net臺站的加速度反應(yīng)譜比和Nakamura法(單臺譜比法)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,計算并建議一個簡單而有力的深度校正因子。最后,將8組臺站的標(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)展趨勢的總結(jié),利用日本KiK-net實際地震動觀測數(shù)據(jù)統(tǒng)計規(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)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU352.11

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