本文選題：巖溶地基 + 高層框架結(jié)構(gòu)��； 參考：《廣西大學(xué)》2013年碩士論文

【摘要】：我國可溶性巖石分布廣泛,類型眾多,在復(fù)雜的巖溶地基上建造高大建筑物,給工程人員提出了許多新的問題與挑戰(zhàn)。目前我國針對(duì)巖溶區(qū)建筑結(jié)構(gòu)的抗震研究較少,本文采用數(shù)值模擬分析方法,基于共同作用,研究巖溶地質(zhì)對(duì)上部框架結(jié)構(gòu)抗震性能影響,為巖溶區(qū)的建筑工程提供參考借鑒,主要工作有： (1)探討了巖溶區(qū)的地質(zhì)特點(diǎn),采用Drucker-Prager本構(gòu)模型對(duì)地基進(jìn)行模擬,并對(duì)模型中各參數(shù)的取值進(jìn)行深入討論。巖溶區(qū)的可溶性巖層以碳酸鹽巖的分布最廣,紅粘土的分布最為典型。碳酸鹽巖有很好的力學(xué)性質(zhì),但由于其自身可溶性而常發(fā)育有溶洞,溶槽等削弱其承載力。巖溶區(qū)紅粘土的分布具有上硬下軟的特點(diǎn),其含水率比一般性的粘土要大,卻有很高的承載力,土層中常發(fā)于有土洞。 (2)對(duì)巖溶場(chǎng)地地基模型進(jìn)行常遇地震下的地震反應(yīng)分析,研究地震波在巖溶地質(zhì)條件下的傳播特點(diǎn)：巖溶場(chǎng)地的土層對(duì)地震波有一定“濾波作用”,接近場(chǎng)地的自振頻率的分量被充分保留,由于巖溶地基剛度大,保留下來的頻率偏高；巖溶場(chǎng)地土層對(duì)地震波有一定的放大效應(yīng),當(dāng)巖溶地基中發(fā)育有土洞時(shí),這種放大效應(yīng)加強(qiáng)。 (3)分別采用固基假定的分析方法和共同作用分析方法對(duì)巖溶地基上的框架結(jié)構(gòu)做地震反應(yīng)分析,對(duì)比兩種地震反應(yīng)分析方法的計(jì)算結(jié)果。與固基假定的分析模型相比,共同作用模型得到的上部結(jié)構(gòu)的位移增大,中下層柱剪力增加,中上層柱的剪力減少,最大剪力發(fā)生在內(nèi)柱底層。 (4)基于地基—基礎(chǔ)—框架結(jié)構(gòu)共同作用的有限元地震反應(yīng)分析,研究了巖溶地基中土洞的發(fā)育對(duì)上部框架結(jié)構(gòu)地震反應(yīng)的影響：土洞的存在會(huì)導(dǎo)致上部結(jié)構(gòu)地震反應(yīng)增強(qiáng),對(duì)結(jié)構(gòu)抗震造成不利。 (5)基于巖溶地基—基礎(chǔ)—框架結(jié)構(gòu)共同作用的有限元地震反應(yīng)分析,研究巖溶地基剛度的變化對(duì)上部框架結(jié)構(gòu)抗震性能的影響。研究表明,地基的剛度越大,上部結(jié)構(gòu)的地震反應(yīng)越強(qiáng),因此,對(duì)于剛度較大巖溶地基,有必要加強(qiáng)其上部的高層框架結(jié)構(gòu)的抗震能力。
[Abstract]:There are many kinds of soluble rocks in China. The construction of tall buildings on the complex karst foundation brings many new problems and challenges to engineers. At present, there is little research on seismic resistance of building structure in karst area in our country. In this paper, numerical simulation analysis method is used to study the influence of karst geology on seismic performance of superframe structure, which provides reference for building engineering in karst area. The main tasks are: 1) the geological characteristics of karst area are discussed, the foundation is simulated by Drucker-Prager constitutive model, and the values of each parameter in the model are discussed in depth. In karst area, carbonate rock is the most widely distributed and red clay is the most typical. Carbonate rocks have good mechanical properties, but they often develop caverns because of their own solubility, which weaken their bearing capacity. The distribution of red clay in karst area is characterized by the hardness and softness. The water content of red clay is larger than that of common clay, but it has a high bearing capacity. 2) analyzing the seismic response of the foundation model of karst site under frequent earthquakes, and studying the propagation characteristics of seismic wave under karst geological conditions: the soil layer of karst site has certain "filtering effect" on seismic wave. The component of the natural vibration frequency near the site is fully preserved, because of the large stiffness of the karst foundation, the reserved frequency is on the high side, the soil layer of the karst site has a certain amplification effect on the seismic wave, and when there are soil holes in the karst foundation, This amplification effect is reinforced. 3) the seismic response of frame structure on karst foundation is analyzed by using the analysis method of fixed foundation assumption and the method of interaction analysis, and the results of the two seismic response analysis methods are compared. Compared with the analysis model based on the fixed foundation assumption, the displacement of the superstructure obtained by the interaction model increases, the shear force of the middle and lower column increases, the shear force of the upper column decreases, and the maximum shear force occurs at the bottom of the inner column. 4) based on the finite element seismic response analysis of the interaction between foundation, foundation and frame structure, the influence of the soil hole development on the seismic response of the upper frame structure is studied: the existence of the soil hole will lead to the enhancement of the seismic response of the superstructure. It is unfavorable to the earthquake resistance of the structure. 5) based on the finite element seismic response analysis of karst foundation-foundation-frame structure, the influence of the change of karst foundation stiffness on the seismic behavior of the upper frame structure is studied. The results show that the stronger the stiffness of the foundation is, the stronger the seismic response of the superstructure is. Therefore, it is necessary to strengthen the seismic capacity of the upper high-rise frame structure for the karst foundation with higher stiffness.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU973.31

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