本文選題：場(chǎng)地分類(lèi) + Vs30��； 參考：《中國(guó)地震局地球物理研究所》2015年碩士論文

【摘要】：場(chǎng)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(píng)價(jià)中占有舉足輕重的地位。不同的場(chǎng)地條件可引起地震動(dòng)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(chǎng)地放大周期段相近,那么可能會(huì)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(chǎng)地條件影響的一個(gè)重要手段就是進(jìn)行場(chǎng)地分類(lèi),相應(yīng)的場(chǎng)地分類(lèi)就是將地震動(dòng)作用下具有相似場(chǎng)地條件的場(chǎng)地進(jìn)行分類(lèi)。因此,明確而合理的場(chǎng)地分類(lèi)方法和指標(biāo),可為工程場(chǎng)地設(shè)計(jì)地震動(dòng)確定和工程結(jié)果抗震設(shè)防提供重要依據(jù)。國(guó)內(nèi)外許多學(xué)者進(jìn)行過(guò)場(chǎng)地分類(lèi)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(chǎng)地分類(lèi)方法有美國(guó)《ASCE-10》中采用等效剪切波速Vs30作為場(chǎng)地類(lèi)別劃分指標(biāo)的方法和國(guó)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(chǎng)地類(lèi)別劃分方法。近年來(lái)國(guó)內(nèi)越來(lái)越多的研究者認(rèn)為,我國(guó)應(yīng)借鑒歐美等國(guó)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(lái)全面考慮,其性?xún)r(jià)比如何,我們是否需要增加深度至30m?這是一個(gè)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(duì)這一課題進(jìn)行相關(guān)研究。本文收集了全國(guó)18個(gè)地區(qū)的1130個(gè)場(chǎng)地鉆孔資料,先對(duì)覆蓋層厚度小于20m的場(chǎng)地建立了基于Vs30的外推模型,并針對(duì)每一個(gè)場(chǎng)地鉆孔建立相應(yīng)的場(chǎng)地土層反應(yīng)計(jì)算模型,隨后分別依據(jù)中國(guó)和美國(guó)場(chǎng)地分類(lèi)標(biāo)準(zhǔn)對(duì)場(chǎng)地土層反應(yīng)計(jì)算模型進(jìn)行了場(chǎng)地類(lèi)別劃分；選取人工基巖加速度時(shí)程和強(qiáng)震動(dòng)加速度時(shí)程作為輸入地震動(dòng)對(duì)所建立的場(chǎng)地模型進(jìn)行一維土層反應(yīng)分析,得到場(chǎng)地地表地震動(dòng)的峰值加速度PGA、峰值加速度場(chǎng)地放大系數(shù)Ka,峰值速度場(chǎng)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(chǎng)地地震動(dòng)參數(shù)計(jì)算結(jié)果發(fā)現(xiàn),從同一類(lèi)場(chǎng)地對(duì)地震動(dòng)的影響效應(yīng)的一致性來(lái)看：美國(guó)的C類(lèi)場(chǎng)地優(yōu)于中國(guó)的Ⅱ類(lèi)場(chǎng)地；中國(guó)的Ⅲ類(lèi)場(chǎng)地場(chǎng)地效應(yīng)的離散性較大,表現(xiàn)出一定的劣勢(shì)；在軟弱場(chǎng)地上,中國(guó)的Ⅳ類(lèi)場(chǎng)地比美國(guó)的E類(lèi)劃分更細(xì)致；總體而言,考慮覆蓋土層厚度的中國(guó)場(chǎng)地類(lèi)別劃分方法比未考慮覆蓋土層厚度的美國(guó)場(chǎng)地類(lèi)別劃分方法顯示了一定的優(yōu)勢(shì)性,所以在新的場(chǎng)地類(lèi)別劃分方法中不應(yīng)該摒棄覆蓋層厚度,但同時(shí)考慮美國(guó)場(chǎng)地類(lèi)別劃分計(jì)算的Vs30必然能更全面的反映場(chǎng)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(chǎng)地地震動(dòng)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(chǎng)地分類(lèi)方法,并根據(jù)現(xiàn)行的場(chǎng)地劃分規(guī)范進(jìn)行了各場(chǎng)地類(lèi)別界限的調(diào)整。同時(shí)針對(duì)中國(guó)的Ⅱ類(lèi)和Ⅲ類(lèi)場(chǎng)地的場(chǎng)地地震動(dòng)參數(shù)離散性較大的問(wèn)題,依據(jù)覆蓋土層厚度和新調(diào)整的場(chǎng)地類(lèi)別等效剪切波速界限值將Ⅱ類(lèi)場(chǎng)地劃分為Ⅱ1和Ⅱ 2類(lèi)場(chǎng)地,將Ⅲ類(lèi)場(chǎng)地中H50m且Vse≤170m/s的場(chǎng)地歸類(lèi)到Ⅳ類(lèi)場(chǎng)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(guó)地震局地球物理研究所
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU435

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本文編號(hào)：1738837