本文選題：混凝土壩 + 地震響應(yīng)��； 參考：《中國(guó)水利水電科學(xué)研究院》2017年碩士論文

【摘要】：高壩工程的地震響應(yīng)及其極限能力是抗震安全評(píng)價(jià)核心內(nèi)容,同時(shí),真實(shí)地模擬強(qiáng)震作用下混凝土壩損傷破壞過(guò)程尤為重要。而進(jìn)行地震響應(yīng)分析的基礎(chǔ)在于需要全面考慮能夠影響到結(jié)構(gòu)性態(tài)的各種關(guān)鍵因素,例如模擬混凝土材料性能的本構(gòu)關(guān)系模型,可供參考的全面的抗震安全評(píng)價(jià)規(guī)范體系的及相應(yīng)指標(biāo)的建立,壩體-地基-庫(kù)水之間的相互作用等,本文針對(duì)以上三個(gè)方面的內(nèi)容進(jìn)行研究探討,主要內(nèi)容和成果如下:(1)本文綜合分析研究了國(guó)內(nèi)外混凝土材料本構(gòu)關(guān)系的相關(guān)研究成果,基于損傷理論、塑性理論,并考慮到本構(gòu)模型的實(shí)際應(yīng)用推廣,借鑒現(xiàn)行混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范推薦的混凝土應(yīng)力-應(yīng)變?nèi)�提出了一種混凝土損傷塑性模型。為進(jìn)一步研究混凝土壩非線性地震響應(yīng)奠定了理論基礎(chǔ)。(2)研究了 FEPG平臺(tái)的結(jié)構(gòu)與特點(diǎn),并基于FEPG平臺(tái)的元件化工作流程,推到了混凝土結(jié)構(gòu)損傷塑性的靜/動(dòng)力平衡方程的弱解形式,在理論層面論述了損傷本構(gòu)模型的非線性算法迭代步驟,從而明確了基于損傷模型的算法思路。(3)介紹了粘彈性邊界和庫(kù)動(dòng)水附加質(zhì)量理論公式,并基于ABAQUS有限元軟件的二次開發(fā)腳本接口,自行編寫了 Python版本的自動(dòng)施加程序,通過(guò)兩個(gè)例子的驗(yàn)證說(shuō)明了所開發(fā)程序的合理性和實(shí)用性。(4)分析研究了美國(guó)水工建筑物設(shè)計(jì)規(guī)范(EREM)基于性能目標(biāo)的抗震評(píng)價(jià)方法、評(píng)價(jià)標(biāo)準(zhǔn)、定量化性能指標(biāo),同時(shí)對(duì)國(guó)內(nèi)外相關(guān)成果進(jìn)行了對(duì)比分析。結(jié)合現(xiàn)有的高混凝土壩的抗震評(píng)估,借鑒先進(jìn)行線彈性評(píng)價(jià),再非線性響應(yīng)分析的評(píng)價(jià)思路,引入U(xiǎn)SACE評(píng)價(jià)程序和判別準(zhǔn)則中的結(jié)構(gòu)需求能力比、超線彈性累計(jì)時(shí)間等定量化指標(biāo),再結(jié)合現(xiàn)行規(guī)范從壩體關(guān)鍵部位、橫縫等方面進(jìn)行非線性響應(yīng)修正的分步實(shí)施,建立混凝土高壩抗震性能定量化評(píng)價(jià)框架。研究成果為混凝土壩抗震性能評(píng)價(jià)提供參考。
[Abstract]:The seismic response and limit capacity of high dam engineering are the core contents of seismic safety evaluation. At the same time, it is very important to simulate the damage and failure process of concrete dam under strong earthquake. The seismic response analysis is based on the need to consider all kinds of key factors that can affect the structural behavior, such as the constitutive relation model, which simulates the performance of concrete materials. For reference, the establishment of comprehensive seismic safety evaluation code system and its corresponding indexes, the interaction between dam body, foundation and reservoir water, etc., are discussed in this paper in view of the above three aspects. The main contents and results are as follows: (1) in this paper, the related research results of constitutive relations of concrete materials at home and abroad are comprehensively analyzed and studied, based on damage theory, plastic theory, and taking into account the practical application and extension of constitutive model. Based on the stress-strain curve of concrete recommended by the current concrete structural design code, a damage plastic model of concrete is proposed. For further study of nonlinear seismic response of concrete dams, the structure and characteristics of FEPG platform are studied, and the component workflow based on FEPG platform is also studied. The weak solution of the static / dynamic equilibrium equation of damage plasticity of concrete structures is deduced. The iterative steps of nonlinear algorithm for damage constitutive model are discussed in theory. The theoretical formulas of viscoelastic boundary and hydrodynamic additional mass are introduced. Based on the secondary development script interface of ABAQUS finite element software, the automatic application program of Python version is written by ourselves. Through the verification of two examples, the rationality and practicability of the developed program are illustrated. The seismic evaluation method, evaluation standard and quantitative performance index based on performance objectives are analyzed and studied in the American hydraulic structure Design Code (EREMM). At the same time, the relative results at home and abroad are compared and analyzed. Combined with the seismic evaluation of existing high concrete dams, the evaluation ideas of linear elastic evaluation and nonlinear response analysis are used for reference, and the ratio of structural demand capacity in USACE evaluation program and discriminant criterion is introduced. Based on the quantitative indexes such as over-linear elastic accumulative time and combined with the existing code, the nonlinear response correction is carried out step by step from the key parts of the dam body and the transverse joints, and a quantitative evaluation framework for seismic performance of high concrete dams is established. The research results provide a reference for seismic performance evaluation of concrete dams.
【學(xué)位授予單位】：中國(guó)水利水電科學(xué)研究院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TV642.1;TV312

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