本文選題：場地條件 + 軟弱土夾層　； 參考：《華中科技大學(xué)》2015年碩士論文

【摘要】：場地條件在地震動研究領(lǐng)域一直是重要的課題,場地條件中影響土層與結(jié)構(gòu)地震響應(yīng)的因素眾多。場地中含有軟土夾層是一種常見的地質(zhì)現(xiàn)象。《建筑抗震設(shè)計規(guī)范》BG5011-2010(以下簡稱《抗規(guī)》)中對場地類別的劃分方法并不適合于該類場地,且對該類場地沒有提出明確的設(shè)計規(guī)定。本文以此為出發(fā)點(diǎn),建立含有軟土夾層的土層模型,結(jié)合地表面上的較短周期結(jié)構(gòu),采用時程分析法在基巖面處輸入地震波,運(yùn)用ABAQUS在考慮土的非線性因素影響下進(jìn)行有限元分析。通過計算與分析發(fā)現(xiàn):在含有軟土夾層的場地中,基巖面上覆土對地震加速度的放大作用小于無軟土夾層的場地;軟土夾層在地震作用下的應(yīng)變普遍大于其他土層,對地震能量的耗散更大;地面結(jié)構(gòu)的地下室對加速度有一定程度的削弱,結(jié)構(gòu)頂部的加速度峰值一般大于結(jié)構(gòu)的底部;軟硬土層彈性模量比值變化的影響較軟土夾層厚度變化的影響要顯著;軟硬土層彈性模量差異越大,覆土對加速度放大作用越小,但兩者之間不呈現(xiàn)為線性關(guān)系;當(dāng)軟硬土層彈性模量比值大于一定值后,覆土對加速度峰值反而起減小的作用。結(jié)合計算結(jié)果和理論分析,本文建議該領(lǐng)域可考慮采用以下方法,如采用反應(yīng)譜法進(jìn)行對比分析;以大容量的實際地震數(shù)據(jù)為樣本用三維實體模型進(jìn)行分析;選擇更符合實際的土體本構(gòu)關(guān)系;建立長周期的地面結(jié)構(gòu)進(jìn)行對比分析等,以期得到符合地震動、場地土和結(jié)構(gòu)實際狀況的研究成果。
[Abstract]:Site conditions have always been an important subject in the field of ground motion research. There are many factors that affect the seismic response of soil and structure in site conditions. It is a common geological phenomenon that soft soil intercalation is included in the site. The classification method of site category in BG5011-2010 (hereinafter referred to as "Anti-gauge") is not suitable for this kind of site, and there is no clear design regulation for this kind of site. In this paper, a soil layer model with soft soil intercalation is established. Combined with the short period structure on the ground surface, the seismic wave is input at the bedrock surface by time-history analysis method. The finite element analysis is carried out by using ABAQUS under the influence of nonlinear factors of soil. Through calculation and analysis, it is found that in the site with soft soil intercalation, the amplification of seismic acceleration by overlying soil on the bedrock surface is less than that in the site without soft soil intercalation, and the strain of soft soil intercalation under earthquake is generally greater than that of other soil layers. The ground structure basement weakens the acceleration to a certain extent, and the peak acceleration at the top of the structure is generally greater than that at the bottom of the structure. The effect of the ratio of elastic modulus of soft and hard soil is more significant than that of the thickness of soft soil intercalation, the greater the difference of elastic modulus of soft and hard soil is, the less the effect of overburden on acceleration is, but there is no linear relationship between them. When the ratio of elastic modulus of soft and hard soil is greater than a certain value, the soil overburden plays a role in decreasing the acceleration peak. Combined with the results of calculation and theoretical analysis, this paper suggests that the following methods should be adopted in this field, such as using the method of response spectrum to carry on comparative analysis, taking the actual seismic data of large capacity as the sample and using the three-dimensional solid model to analyze; A more realistic constitutive relation of soil is chosen, and a long-period ground structure is established for comparative analysis, in order to obtain the research results in accordance with the actual conditions of ground motion, site soil and structure.
【學(xué)位授予單位】：華中科技大學(xué)
【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：1814724