本文關(guān)鍵詞： 進水塔 抗震分析 譜分析 高地震烈度區(qū) 穩(wěn)定性　出處：《大連理工大學》2014年碩士論文　論文類型：學位論文

【摘要】：進水塔是一種體型結(jié)構(gòu)、邊界條件以及受力情況都比較復雜的水工建筑物,一般是采用鋼筋混凝土薄壁空腹箱形結(jié)構(gòu),建在靠近岸邊的水庫中,頂部用工作橋與河岸連接,其外圍四周皆承受水壓力,因此進水塔在地震作用下的安全十分重要。水電站進水塔作為地下引水系統(tǒng)的首部結(jié)構(gòu),其抗震安全性關(guān)系到整個水電站的安全和效益。 由于其復雜的結(jié)構(gòu)形式和邊界條件,高烈度地震區(qū)巖基上進水塔結(jié)構(gòu)的地基—塔體—塔背山體—水體的相互作用問題十分復雜。本文結(jié)合某進水塔工程實例,通過建立三維有限元計算模型,對該進水塔進行數(shù)值模擬計算,并進行了詳細的自振特性、應力與變形分析。 主要內(nèi)容如下： (1)系統(tǒng)地介紹了進水塔結(jié)構(gòu)分析的發(fā)展現(xiàn)狀,結(jié)構(gòu)靜動力分析理論、有限元方法及理論,總結(jié)了進水塔的合理計算方法和應力分析的方法以及應力分布的一般規(guī)律。指明了各類荷載組合工況作用對進水塔塔體應力的各自貢獻及其主次地位,為工程設計提供了可靠的計算結(jié)果。 (2)完成了對進水塔實體模型的建立及有限元離散化,計算了進水塔在靜荷載作用下的整體位移、應力。 (3)綜合考慮各種因素,動力方面完成了結(jié)構(gòu)動力特性分析,討論了進水塔整體結(jié)構(gòu)自振特性的影響因素。動力反應分析中采用振型分解反應譜方法對進水塔進行了抗震計算,分析了進水塔在橫河向、順河向和豎向地震共同作用下的地震力,評價了該結(jié)構(gòu)的抗震性能。并與靜荷載作用下的計算結(jié)果疊加后對進水塔結(jié)構(gòu)的抗震性能進行了評估。計算結(jié)果符合實際,說明對該進水塔的應力和變形的仿真模擬計算是成功的。 (4)對進水塔結(jié)構(gòu)的抗滑穩(wěn)定性、抗浮穩(wěn)定性、抗傾覆承載能力、底板和基巖的承載能力極限狀態(tài)進行了計算分析,計算結(jié)果滿足要求,說明結(jié)構(gòu)設計是合理和安全的。
[Abstract]:The intake tower is a kind of hydraulic structure with complicated boundary conditions and forces. It is usually a reinforced concrete thin-walled hollow box structure, built in a reservoir near the shore, the top of which is connected by a working bridge to the river bank. So the safety of intake tower under earthquake is very important. As the first structure of underground water diversion system, its seismic safety is related to the safety and benefit of the whole hydropower station. Because of its complex structural form and boundary conditions, the interaction between the foundation, tower body, mountain body and water body of the intake tower structure on the rock foundation in the high intensity seismic area is very complicated. In this paper, an example of a water intake tower is presented. The three-dimensional finite element model is established to simulate the intake tower, and the natural vibration characteristics, stress and deformation of the tower are analyzed in detail. The main contents are as follows:. 1) the development of structure analysis of intake tower, the theory of structure static and dynamic analysis, finite element method and theory are introduced systematically. The reasonable calculation method of intake tower, the method of stress analysis and the general law of stress distribution are summarized. The contribution of various load combination working conditions to the stress of intake tower and its primary and secondary status are pointed out. It provides reliable calculation results for engineering design. 2) the solid model of the intake tower and the finite element discretization are completed, and the integral displacement and stress of the intake tower under static load are calculated. 3) considering all kinds of factors synthetically, the dynamic characteristic analysis of the structure is completed, and the influence factors of the natural vibration characteristic of the whole structure of the intake tower are discussed. In the dynamic response analysis, the seismic analysis of the intake tower is carried out by using the mode decomposition response spectrum method. The seismic force of the intake tower under the joint action of the transverse river direction, the downstream direction and the vertical earthquake is analyzed. The seismic performance of the structure is evaluated. The seismic performance of the intake tower structure is evaluated after superimposing the calculated results under static load. The calculated results are in accordance with the actual situation. It is shown that the simulation calculation of the stress and deformation of the intake tower is successful. 4) the anti-slide stability, anti-floating stability, anti-overturning bearing capacity of intake tower structure, the ultimate state of bearing capacity of bottom plate and bedrock are calculated and analyzed. The calculated results meet the requirements, and show that the structural design is reasonable and safe.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV312

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本文編號：1498245