本文關(guān)鍵詞：超大型冷卻塔結(jié)構(gòu)地震反應(yīng)分析及試驗(yàn)研究　出處：《中國(guó)地震局工程力學(xué)研究所》2015年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 超大型冷卻塔 土-結(jié)相互作用 行波效應(yīng) 隔震 修正系數(shù)

【摘要】：近年來(lái),隨著國(guó)家環(huán)保戰(zhàn)略的要求,我國(guó)三北地區(qū)正在醞釀建造一批1000MW超臨界空冷機(jī)組,與之相匹配的間接冷卻塔結(jié)構(gòu)一般高達(dá)200米以上、直徑達(dá)180米以上、進(jìn)風(fēng)口高度達(dá)30米以上。建設(shè)地點(diǎn)多位于南北地震帶中北段,地震危險(xiǎn)性高,場(chǎng)地條件復(fù)雜。其抗震設(shè)計(jì)必須面對(duì)高烈度、土-結(jié)構(gòu)相互作用以及行波效應(yīng)等難題。而目前國(guó)內(nèi)外關(guān)于超大型冷卻塔結(jié)構(gòu)高烈度抗震設(shè)計(jì)問題的相關(guān)研究資料很少,可參考資料更是罕見。圍繞這一問題,本文采用地震模擬振動(dòng)臺(tái)試驗(yàn)與有限元數(shù)值模擬分析相結(jié)合的手段,對(duì)超大型冷卻塔結(jié)構(gòu)的地震破壞機(jī)理、土-結(jié)構(gòu)相互作用、行波效應(yīng)及其隔震可行性等問題進(jìn)行了研究探討,主要完成了以下幾方面的工作:1.采用欠人工質(zhì)量相似理論設(shè)計(jì)了原型高度為220米直徑為188米的超大型冷卻塔結(jié)構(gòu)1:30縮尺試驗(yàn)?zāi)Ｐ�。通過(guò)地震模擬振動(dòng)臺(tái)試驗(yàn),獲得了考慮不同場(chǎng)地條件的不同烈度工況下超大型冷卻塔模型結(jié)構(gòu)的動(dòng)力響應(yīng)、振動(dòng)特性及其破壞特征,研究揭示了超大型冷卻塔結(jié)構(gòu)的地震作用破壞機(jī)理,發(fā)現(xiàn)超大型冷卻塔結(jié)構(gòu)下部的X型支柱上下端部、筒壁最薄的塔筒喉部是其地震薄弱部位,為超大型冷卻塔結(jié)構(gòu)優(yōu)化抗震設(shè)計(jì)提供了依據(jù)。通過(guò)模型結(jié)構(gòu)有限元數(shù)值模擬并與試驗(yàn)結(jié)果的對(duì)比分析,交互驗(yàn)證了有限元數(shù)值模型與試驗(yàn)?zāi)Ｐ偷暮侠硇浴?.針對(duì)II、III類場(chǎng)地條件下高大結(jié)構(gòu)實(shí)際存在的地基土-結(jié)構(gòu)相互作用效應(yīng)問題,提出了對(duì)設(shè)計(jì)譜水平地震最大影響系數(shù)max?采用修正系數(shù)s?進(jìn)行調(diào)整的方法,以簡(jiǎn)化超大型冷卻塔結(jié)構(gòu)抗震設(shè)計(jì)分析過(guò)程。采用粘彈性阻尼單元模擬地基土邊界,以某超大型冷卻塔結(jié)構(gòu)原型為例進(jìn)行了地基土-結(jié)構(gòu)相互作用分析。通過(guò)對(duì)比分析是否考慮土-結(jié)構(gòu)相互作用兩個(gè)模型的結(jié)構(gòu)動(dòng)力特性及地震反應(yīng),給出了II、III類場(chǎng)地條件下考慮土-結(jié)構(gòu)相互作用時(shí)冷卻塔結(jié)構(gòu)的動(dòng)力反應(yīng)規(guī)律。3.綜合考慮行波效應(yīng)不利影響,提出了對(duì)設(shè)計(jì)譜水平地震最大影響系數(shù)max?采用修正系數(shù)T?調(diào)整的方法,以簡(jiǎn)化超大型冷卻塔結(jié)構(gòu)抗震分析過(guò)程。仍以前述超大型冷卻塔結(jié)構(gòu)為例,進(jìn)行了是否考慮土-結(jié)構(gòu)相互作用效應(yīng)的超大型冷卻塔結(jié)構(gòu)行波效應(yīng)對(duì)比分析,指出視波速?1000 m/s的I類場(chǎng)地條件下超大型冷卻塔抗震分析可以不考慮行波效應(yīng);視波速?350 m/s的II~III類場(chǎng)地條件下,建議超大型冷卻塔結(jié)構(gòu)中應(yīng)對(duì)超大型冷卻塔行波效應(yīng)給予足夠重視。4.給出了超大型冷卻塔結(jié)構(gòu)采用橡膠支座基礎(chǔ)隔震技術(shù)的設(shè)計(jì)分析方法。本文采用有限元分析方法,對(duì)比研究了是否考慮土-結(jié)構(gòu)相互作用、是否考慮行波效應(yīng)等條件下超大型冷卻塔結(jié)構(gòu)采用基礎(chǔ)隔震的減震效果。以8,9度抗震設(shè)防為例,證明了超大型冷卻塔結(jié)構(gòu)采取基礎(chǔ)隔震措施后上部結(jié)構(gòu)各關(guān)鍵節(jié)點(diǎn)之間的地震反應(yīng)相對(duì)位移、加速度以及X型支柱位移角均能有效降低,可大幅提升超大型冷卻塔結(jié)構(gòu)的地震安全性。
[Abstract]:In recent years, with the national environmental strategy, north areas of China is preparing to build a batch of 1000MW supercritical air cooling unit, indirect cooling tower structure to match the average as high as 200 meters, diameter of 180 meters, the air inlet height of 30 meters. The construction site located in the northern section of North South seismic with high seismic hazard, site condition is complex. The seismic design must face high intensity, soil structure interaction and the traveling wave effect problem. And at present very few domestic and foreign related research about super large cooling tower structure in high seismic design information, reference is rare. Around this issue, this paper adopts the finite element and the shaking table test method of numerical simulation analysis, failure mechanism of super large cooling tower structure earthquake, soil structure interaction, and the feasibility of seismic traveling wave effect etc. The problems are discussed, mainly completed the following work: 1. using under artificial quality similarity theory to design the prototype height of super large cooling tower structure of 1:30 scale test model of 220 meters to 188 meters in diameter. Through shaking table test, the dynamic response of super large cooling tower model is obtained considering the different site conditions of different intensity conditions, vibration characteristics and failure characteristics, study reveals the seismic effect of super large cooling towers of the failure mechanism, find the X - pillar super large cooling tower on the lower part of the lower part of the tower cylinder wall of the throat, thin is the seismic weak parts, provide the basis for super large cooling the tower structure optimization of seismic design. Through comparative analysis of finite element model and numerical simulation and experimental results verify the rationality of the.2. interaction, finite element numerical model and test model According to II, soil III site under the condition of tall structure the actual structure interaction problems, put forward the design of horizontal earthquake influence coefficient maximum spectrum max? The correction coefficient s? Method of adjustment, in order to simplify seismic super large cooling tower structure design analysis process. Using viscoelastic damping element to simulate the foundation the soil boundary, a super large cooling tower structure as an example to analyze the prototype of soil structure interaction. Through the comparative analysis of whether considering the soil structure interaction of two model structure dynamic characteristics and seismic response, to II, when the adverse effects of dynamic response of.3. cooling tower structure considering traveling wave effect considering soil structure interaction III site conditions, proposed to the design level earthquake influence coefficient maximum spectrum max? The correction coefficient T? Method of adjustment to simplify the super large cooling tower Process. Seismic analysis of structures in these super large cooling tower structure as an example, to consider whether the comparative analysis of super large cooling tower structure of the traveling wave effect of soil structure interaction, pointed out that the apparent velocity of 1000 m/s? I site under the condition of super large cooling tower seismic analysis can not consider the traveling wave effect; wave velocity 350? M/s II~III site conditions, with super large cooling tower structure in super large cooling tower traveling wave effect is given enough attention given by.4. is adopted in the design of super large cooling tower structure of rubber base isolated technology analysis method. This paper uses the finite element analysis method, comparative study of whether considering soil structure interaction whether, considering the traveling wave effect under the condition of super large cooling tower structure with damping effect of base isolation. With the 8,9 degree earthquake as an example, proves that the super large cooling tower structure to base After the base isolation measures, the relative displacement, acceleration and X pillar displacement angle between the key nodes of the upper structure can be effectively reduced, and the seismic safety of the super large cooling tower structure can be greatly improved.

【學(xué)位授予單位】：中國(guó)地震局工程力學(xué)研究所
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU347;TU311.3

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