本文關(guān)鍵詞：高層建筑雙層橡膠支座分段隔震技術(shù)研究　出處：《蘭州理工大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 隔震理論 基礎(chǔ)隔震 層間隔震 橡膠墊支座 分段隔震 ANSYS

【摘要】：傳統(tǒng)的結(jié)構(gòu)抗震是通過(guò)結(jié)構(gòu)本身的強(qiáng)度剛度和延性,以結(jié)構(gòu)付出塑性變形和結(jié)構(gòu)部件損傷為代價(jià)的抗震設(shè)計(jì),這種方法很可能由于不具備自我調(diào)節(jié)的能力而無(wú)法滿足安全要求,甚至在大地震或罕遇地震中帶來(lái)巨大的經(jīng)濟(jì)損失和人員傷亡。此時(shí),隔震設(shè)計(jì)方法作為一種更安全有效的抗震方法開(kāi)始受到世界各國(guó)學(xué)者的關(guān)注、研究。早在20世紀(jì)初就有人提出了隔震的概念,但直到20世紀(jì)20年代才開(kāi)始在工程上嘗試應(yīng)用。隔震理論的思想是在建筑物底部或某高度處設(shè)置足夠可靠、水平剛度小的隔震層,來(lái)達(dá)到延長(zhǎng)結(jié)構(gòu)的自振周期,使其遠(yuǎn)離地震輸入的卓越周期,避免共振的目的；同時(shí),整個(gè)結(jié)構(gòu)的水平變形絕大部分集中在隔震層,上部結(jié)構(gòu)基本上是平動(dòng),并通過(guò)隔震層的阻尼器來(lái)吸收地震傳入上部結(jié)構(gòu)的能量,減小結(jié)構(gòu)的地震響應(yīng),從而大大提高了建筑物的可靠性。近幾十年來(lái),現(xiàn)代隔震技術(shù)在基礎(chǔ)理論和土木工程中得到了較大規(guī)模的應(yīng)用�；诟粽鸾Y(jié)構(gòu)理論,在眾多學(xué)者和研究人員研究的基礎(chǔ)之上,對(duì)基礎(chǔ)隔震和層間隔震理論在高層建筑應(yīng)用上的優(yōu)缺點(diǎn)總結(jié)分析后,進(jìn)而對(duì)高層建筑雙層橡膠支座分段隔震問(wèn)題進(jìn)行了部分研究。 首先,分析了雙層橡膠支座分段隔震結(jié)構(gòu)的簡(jiǎn)化計(jì)算模型問(wèn)題,得到了雙層橡膠支座分段隔震結(jié)構(gòu)的動(dòng)力學(xué)運(yùn)動(dòng)方程。并運(yùn)用了ANSYS軟件建立三維雙層橡膠支座分段隔震結(jié)構(gòu)的實(shí)體模型,對(duì)其進(jìn)行模態(tài)分析。結(jié)果表明,分段隔震更好的延長(zhǎng)了結(jié)構(gòu)周期,減小了地震作用,第一、二階振型主要以剪切變形為主。 其次,對(duì)ANSYS軟件建立的分段隔震結(jié)構(gòu)模型,研究了其在雙向地震作用下的動(dòng)力響應(yīng)問(wèn)題。在分析此問(wèn)題時(shí),首先通過(guò)有限元軟件建立非隔震結(jié)構(gòu)、基礎(chǔ)隔震結(jié)構(gòu)、層間隔震結(jié)構(gòu)和分段隔震結(jié)構(gòu)的三維有限元模型,輸入雙向水平地震波后,借助ANSYS有限元分析軟件分別分析各個(gè)隔震形式在多遇地震作用下的位移響應(yīng)、加速度響應(yīng)和最大剪力等情況,并對(duì)四者的數(shù)據(jù)進(jìn)行對(duì)比分析。研究結(jié)果表明,雙層橡膠支座分段隔震結(jié)構(gòu)比其他隔震結(jié)構(gòu)形式有較好的隔震效果。 最后,研究了中間隔震層不同位置時(shí)的分段隔震結(jié)構(gòu)的減震問(wèn)題和分段隔震結(jié)構(gòu)在罕遇地震影響下的傾覆問(wèn)題。在研究分段隔震結(jié)構(gòu)的雙層橡膠支座設(shè)置位置不同引起的影響問(wèn)題時(shí),應(yīng)用ANSYS軟件建立中、高、低三種不同位置的雙層橡膠支座的分段隔震結(jié)構(gòu)模型。通過(guò)對(duì)模型的仿真時(shí)程分析,可得結(jié)論分段隔震體系的橡膠支座軸力一般為壓力,減少了隔震支座出現(xiàn)拉應(yīng)力的可能性；將建筑物拆成高寬比相近且較小的疊加結(jié)構(gòu),可避免高柔結(jié)構(gòu)的彎曲變形,使其在地震作用下以剪切變形為主,進(jìn)而避免發(fā)生傾覆失穩(wěn)破壞。
[Abstract]:The traditional aseismic design of structure is based on the strength, stiffness and ductility of the structure itself, at the cost of plastic deformation and structural component damage. This method is likely to be unable to meet safety requirements due to its lack of self-regulation, and even to bring huge economic losses and casualties in large or rare earthquakes. As a safer and more effective seismic method, isolation design method has attracted the attention of scholars all over the world. As early as 20th century, the concept of isolation was put forward. But it was not until 1920s that the idea of isolation theory was to set a sufficiently reliable, horizontal isolation layer at the bottom of the building or at a certain height. In order to prolong the natural vibration period of the structure, make it away from the excellent period of earthquake input and avoid resonance. At the same time, the horizontal deformation of the whole structure is mostly concentrated in the isolation layer, the superstructure is basically translational, and through the damper of the isolation layer to absorb the energy of the earthquake transmitted to the upper structure, and reduce the seismic response of the structure. In recent several ten years, modern isolation technology has been widely used in basic theory and civil engineering, based on the theory of isolation structure. Based on the research of many scholars and researchers, the advantages and disadvantages of the theory of base isolation and interstory isolation in high-rise buildings are summarized and analyzed. Furthermore, the isolation problem of two-layer rubber bearings in high-rise buildings is studied in part. Firstly, the simplified calculation model of two-layer rubber bearing isolated structure is analyzed. The dynamic equations of motion of the two-layer rubber bearing segmented isolation structure are obtained, and the solid model of the three-dimensional two-layer rubber bearing segmented isolation structure is established by using ANSYS software. The results of modal analysis show that segmental isolation can prolong the structural period and reduce the seismic action. The first and second order modes are mainly shear deformation. Secondly, the dynamic response of the segmented isolated structure model established by ANSYS software under the action of bi-directional earthquake is studied. In the analysis of this problem, the non-isolated structure is first established by the finite element software. The three-dimensional finite element model of base-isolated structure, interstory isolated structure and section-isolated structure is inputted into the bi-directional horizontal seismic wave. The displacement response, acceleration response and maximum shear force of each isolated form are analyzed by means of ANSYS finite element analysis software. The results show that the two-layer rubber bearing isolation structure has better isolation effect than other isolation structures. Finally. In this paper, the problem of seismic absorption of segmented isolated structures with different positions of intermediate isolation layer and the overturning problem of segmented isolated structures under the influence of rare earthquakes are studied. The impact of the problem. The segmented isolation structure model with three different positions of middle, high and low positions was established by using ANSYS software. The simulation time history analysis of the model was carried out. It can be concluded that the axial force of rubber bearing is generally pressure, which reduces the possibility of tensile stress in isolation system. When the building is broken down into a superimposed structure with similar aspect ratio and smaller aspect ratio, the bending deformation of the high and flexible structure can be avoided, and the shear deformation is the main one under the earthquake action, thus avoiding the overturning instability and failure.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU352.12

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