本文選題：場地分類 + Vs30��； 參考：《中國地震局地球物理研究所》2015年碩士論文

【摘要】：場地條件影響在建設(shè)工程的抗震設(shè)計(jì)和抗震安全性評價中占有舉足輕重的地位。不同的場地條件可引起地震動反應(yīng)譜不同周期段值的改變,如果結(jié)構(gòu)的自振頻率與場地放大周期段相近,那么可能會引起工程結(jié)構(gòu)更嚴(yán)重的破壞,而一般建設(shè)工程抗震設(shè)防中反映場地條件影響的一個重要手段就是進(jìn)行場地分類,相應(yīng)的場地分類就是將地震動作用下具有相似場地條件的場地進(jìn)行分類。因此,明確而合理的場地分類方法和指標(biāo),可為工程場地設(shè)計(jì)地震動確定和工程結(jié)果抗震設(shè)防提供重要依據(jù)。國內(nèi)外許多學(xué)者進(jìn)行過場地分類方法的研究,目前以抗震設(shè)計(jì)規(guī)范為基礎(chǔ),主要涉及的一般場地分類方法有美國《ASCE-10》中采用等效剪切波速Vs30作為場地類別劃分指標(biāo)的方法和國內(nèi)《建筑抗震設(shè)計(jì)規(guī)范》中采用表層20m范圍內(nèi)覆蓋土層的等效剪切波速和覆蓋土層厚度雙指標(biāo)的場地類別劃分方法。近年來國內(nèi)越來越多的研究者認(rèn)為,我國應(yīng)借鑒歐美等國的經(jīng)驗(yàn),考慮更厚的覆蓋土層影響,以審視我們現(xiàn)行的20m深度考慮方法。但從經(jīng)濟(jì)性、實(shí)用性和實(shí)際需求等諸方面來全面考慮,其性價比如何,我們是否需要增加深度至30m?這是一個需要認(rèn)真研究和詳細(xì)調(diào)查分析的課題。所以本論文將針對這一課題進(jìn)行相關(guān)研究。本文收集了全國18個地區(qū)的1130個場地鉆孔資料,先對覆蓋層厚度小于20m的場地建立了基于Vs30的外推模型,并針對每一個場地鉆孔建立相應(yīng)的場地土層反應(yīng)計(jì)算模型,隨后分別依據(jù)中國和美國場地分類標(biāo)準(zhǔn)對場地土層反應(yīng)計(jì)算模型進(jìn)行了場地類別劃分；選取人工基巖加速度時程和強(qiáng)震動加速度時程作為輸入地震動對所建立的場地模型進(jìn)行一維土層反應(yīng)分析,得到場地地表地震動的峰值加速度PGA、峰值加速度場地放大系數(shù)Ka,峰值速度場地放大系數(shù)Kv和加速度反應(yīng)譜特征周期Tg等參數(shù)。比較分析場地地震動參數(shù)計(jì)算結(jié)果發(fā)現(xiàn),從同一類場地對地震動的影響效應(yīng)的一致性來看：美國的C類場地優(yōu)于中國的Ⅱ類場地；中國的Ⅲ類場地場地效應(yīng)的離散性較大,表現(xiàn)出一定的劣勢；在軟弱場地上,中國的Ⅳ類場地比美國的E類劃分更細(xì)致；總體而言,考慮覆蓋土層厚度的中國場地類別劃分方法比未考慮覆蓋土層厚度的美國場地類別劃分方法顯示了一定的優(yōu)勢性,所以在新的場地類別劃分方法中不應(yīng)該摒棄覆蓋層厚度,但同時考慮美國場地類別劃分計(jì)算的Vs30必然能更全面的反映場地信息,所以建議將等效剪切波速的計(jì)算深度增加到30m。根據(jù)本文場地地震動參數(shù)的比較分析研究結(jié)果及經(jīng)濟(jì)性需要提出按照覆蓋土層厚度和30m最小值計(jì)算等效剪切波速的場地分類方法,并根據(jù)現(xiàn)行的場地劃分規(guī)范進(jìn)行了各場地類別界限的調(diào)整。同時針對中國的Ⅱ類和Ⅲ類場地的場地地震動參數(shù)離散性較大的問題,依據(jù)覆蓋土層厚度和新調(diào)整的場地類別等效剪切波速界限值將Ⅱ類場地劃分為Ⅱ1和Ⅱ 2類場地,將Ⅲ類場地中H50m且Vse≤170m/s的場地歸類到Ⅳ類場地。
[Abstract]:Effect of site conditions play an important role in seismic design and seismic safety evaluation of construction project. Different site conditions can cause the spectrum of different ground motion response period value change, if the frequency of the structure and site amplification period are similar, so may cause more serious damage of engineering structures, and general construction engineering seismic fortification is an important means to reflect the effect of site conditions is the site classification, site classification is the corresponding seismic classification with similar site condition of site effect. Therefore, the method of site classification index and clear and reasonable, for engineering site seismic design and seismic engineering results provide an important basis for fortification. Many domestic and foreign scholars have conducted research on site classification method, the seismic design specifications as the basis, mainly related to the general field A classification method of site classification method using the equivalent shear wave velocity in the range of 20m surface soil cover using the method of equivalent shear wave velocity Vs30 in the United States as site classification indicators and domestic seismic design code of building > and < double cover thickness index. More and more researchers in China in recent years, China should learn from Europe and the United States and other countries experience, considering the effect of soil cover more thick, to examine our current 20m method. But the depth of thinking from the economic, practical and actual demand and other aspects to consider, how its cost, whether we need to add depth to 30m? This is a need of careful study and detailed investigation the subject. So this paper will aim at this topic related research. This paper collected 1130 ground drilling data in 18 areas of the country, the first covering layer thickness is less than 20m The site established extrapolation model based on Vs30, and for each site drilling are established. The corresponding calculation model of soil reaction, then according to Chinese and America site classification standard of soil reaction calculation model for site classification; artificial selection of base rock acceleration and strong motion acceleration as one-dimensional analysis the soil reaction model was established on the site seismic input from PGA peak acceleration of ground surface vibration, the peak acceleration of site amplification coefficient Ka, peak velocity and acceleration of site amplification coefficient Kv spectrum characteristic period Tg parameters. Comparative analysis of ground motion parameters in the calculation results, from the same site of consistency the effect of ground motion of the C site: the United States is better than that of Chinese class II site; discrete III site site effect of China Large, show some disadvantages; in the soft ground, the China IV site than in the United States E more detailed classification; overall, considering the Chinese site classification methods covering soil thickness of covering soil thickness than without considering the American site classification method shows a certain advantage, so in site classification the new method should not abandon the cover thickness, but at the same time considering the United States site classification for Vs30 must be able to reflect the site more comprehensive information, so that the calculation depth equivalent shear wave velocity increased to 30m. according to the comparative analysis of the ground motion parameters of the research results and economic need proposed site classification method to calculate the equivalent shear according to the wave velocity of soil thickness and the minimum value of 30m, and the site boundaries adjusted according to current standard. At the same time to divide the space needle Class II and III site ground motion parameters of Chinese larger discreteness, according to soil covering thickness and adjustment of the site class equivalent shear wave velocity limit value will be divided into 1 class II site II and II 2 sites, classified III site in H50m and Vse than 170m/s to IV site site.

【學(xué)位授予單位】：中國地震局地球物理研究所
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU435

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本文編號：1738837