本文選題：土與結(jié)構(gòu)相互作用 + 結(jié)構(gòu)抗震�。� 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：我國(guó)是一地震多發(fā)國(guó)家,結(jié)構(gòu)抗震性能的研究一直是工程研究的熱點(diǎn)、重點(diǎn),我國(guó)目前的抗震規(guī)范,主要建立在剛性地基假定之上進(jìn)行抗震設(shè)計(jì)。而土與結(jié)構(gòu)相互作用是客觀(guān)存在的,隨著研究的深入,研究人員越來(lái)越重視土與結(jié)構(gòu)的相互作用對(duì)結(jié)構(gòu)抗震性能的影響,尤其是軟弱地基對(duì)結(jié)構(gòu)抗震性能的影響,研究表明軟弱層一定程度上有利于結(jié)構(gòu)抗震。另一方面,研究人員針對(duì)低矮建筑,通過(guò)用橡膠-土(廢舊輪胎、橡膠顆粒與土或其他物質(zhì)的混合物)換填低矮建筑的地基土,設(shè)置隔震墊層來(lái)達(dá)到提高低矮建筑抗震性能的目的。然而,由于橡膠土的承載力較小,不足以承載高層建筑物,不能作為高層結(jié)構(gòu)的隔震墊層,因此本文研究了用橡膠-土換填框架結(jié)構(gòu)樁周土后對(duì)結(jié)構(gòu)抗震性能的影響。本文依托”遂寧市河?xùn)|慈音寺棚戶(hù)區(qū)改造聯(lián)福小區(qū)三期F17地塊”項(xiàng)目,通過(guò)利用ABAQUS有限元分析軟件模擬的方式,基于土與結(jié)構(gòu)的相互作用,研究了不同地基假定、不同土層,對(duì)結(jié)構(gòu)抗震性能的影響;針對(duì)該項(xiàng)目中涉及的高層樁基礎(chǔ)框架結(jié)構(gòu),研究樁周土局部換填橡膠-土后,對(duì)結(jié)構(gòu)體系的抗震性能的影響;研究了不同換填深度的橡膠-土,對(duì)結(jié)構(gòu)體系地震響應(yīng)的影響。主要結(jié)論如下:(1)剛性地基假定對(duì)于柱底剪應(yīng)力的分析有其局限性,不能將底部受剪應(yīng)力分為正剪應(yīng)力區(qū)和負(fù)剪應(yīng)力區(qū)兩部分,與實(shí)際情況不相符,且得出的剪應(yīng)力值偏大,在結(jié)構(gòu)抗震性能研究中有必要考慮土與結(jié)構(gòu)相互作用的影響;(2)考慮土與結(jié)構(gòu)相互作用后,結(jié)構(gòu)體系的頻率降低,周期增大,地震響應(yīng)降低,軟弱層(即淤泥質(zhì)粘土)會(huì)進(jìn)一步降低結(jié)構(gòu)體系的頻率,增大周期,降低地震響應(yīng);(3)換填橡膠-土后,結(jié)構(gòu)體系的頻率降低,周期增大,地震響應(yīng)降低,隨著橡膠-土深度的增加,結(jié)構(gòu)體系的頻率隨之降低,周期隨之增大,地震響應(yīng)隨之降低;(4)在換填的橡膠-土中,對(duì)結(jié)構(gòu)抗震性能提高起到主要作用的是結(jié)構(gòu)外圍樁的樁周橡膠-土,且是其中的上部分橡膠-土。
[Abstract]:China is an earthquake-prone country, and the research on seismic performance of structures has been a hot topic in engineering research. At present, the seismic code of our country is mainly based on the assumption of rigid foundation to carry out seismic design. The soil-structure interaction exists objectively. With the development of the research, researchers pay more and more attention to the influence of the soil-structure interaction on the seismic performance of the structure, especially the influence of the weak foundation on the seismic performance of the structure. The study shows that the weak layer is beneficial to the earthquake resistance of the structure to some extent. On the other hand, for low-rise buildings, the researchers replaced it with rubber-soil (a mixture of used tyres, rubber particles and soil or other material). The isolation cushion is set to improve the seismic performance of low buildings. However, because the bearing capacity of rubber soil is small, it is not enough to carry high-rise buildings and can not be used as isolation cushion of high-rise structure. Therefore, the influence of rubber soil replacement on seismic behavior of pile surrounding soil of frame structure is studied in this paper. In this paper, based on the project of "rebuilding the third phase F17 plot of Lianfu District in Hedong Ciyin Temple shantytown of Suining City", by using ABAQUS finite element analysis software, based on the interaction between soil and structure, the different foundation assumptions and different soil layers are studied. The influence on the seismic behavior of the structure, the influence of the local replacement of the soil around the pile and the rubber soil on the seismic performance of the structure system is studied for the frame structure of the high-rise pile foundation involved in this project, and the rubber soil with different replacement depth is studied. The effect on seismic response of structural system. The main conclusions are as follows: (1) the analysis of column bottom shear stress based on rigid foundation assumption has its limitations. The bottom shear stress can not be divided into two parts: positive shear stress region and negative shear stress zone. In the study of seismic behavior of structures, it is necessary to consider the influence of soil-structure interaction. (2) considering the soil-structure interaction, the frequency of structural system decreases, the period increases, and the seismic response decreases. The frequency of the structural system will be further reduced, and the period will be increased, and the seismic response will be decreased when the soft layer (I. E. silt clay) is replaced with rubber soil, the frequency of the structural system will decrease, the period will increase, and the seismic response will decrease. With the increase of rubber soil depth, the frequency and cycle of the structure system decrease and the seismic response decreases. It is the rubber soil around the pile and the upper part of the pile that plays an important role in improving the seismic performance of the structure.
【學(xué)位授予單位】：成都理工大學(xué)
【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)：1929304