本文選題：非均勻受火 + 襯砌結(jié)構(gòu)　； 參考：《蘇州科技學(xué)院》2014年碩士論文

【摘要】：近年來(lái)，隨著我國(guó)經(jīng)濟(jì)的不斷發(fā)展，隧道的應(yīng)用日益廣泛，隧道火災(zāi)時(shí)有發(fā)生�；馂�(zāi)高溫在不同程度上對(duì)隧道襯砌結(jié)構(gòu)造成了損傷，降低了襯砌結(jié)構(gòu)的安全性。由于隧道是一個(gè)狹長(zhǎng)的結(jié)構(gòu)，縱向溫度分布不均勻，引起隧道襯砌結(jié)構(gòu)內(nèi)力重分布，且襯砌管片之間沿縱向存在顯著的約束作用。因此，研究非均勻受火條件下隧道襯砌結(jié)構(gòu)抗火性能具有重要的實(shí)用價(jià)值。 本文利用有限元軟件ABAQUS，建立了隧道襯砌結(jié)構(gòu)三維有限元模型，通過(guò)數(shù)值模擬，得到了襯砌位移、內(nèi)力隨受火時(shí)間的變化規(guī)律及結(jié)構(gòu)的耐火極限。主要內(nèi)容如下： 1．在分析和總結(jié)國(guó)內(nèi)外研究成果的基礎(chǔ)上，選擇了高溫下材料的熱工性能和熱力學(xué)模型。 2．采用有限元ABAQUS軟件，，建立隧道襯砌結(jié)構(gòu)的三維分析模型，應(yīng)用試驗(yàn)數(shù)據(jù)對(duì)溫度場(chǎng)和力學(xué)計(jì)算結(jié)果進(jìn)行了驗(yàn)證。 3．利用驗(yàn)證后的模型分析了隧道襯砌結(jié)構(gòu)在縱向溫度非均勻分布下的反應(yīng)。 4．研究了縱向約束、火災(zāi)峰值溫度、升溫速率、地面超載、側(cè)壓力系數(shù)、鋼筋強(qiáng)度等級(jí)與混凝土強(qiáng)度等級(jí)對(duì)隧道襯砌結(jié)構(gòu)變形、內(nèi)力的影響。 5．對(duì)比了三種耐火極限判定標(biāo)準(zhǔn)，利用溫度控制準(zhǔn)則對(duì)耐火極限進(jìn)行了參數(shù)分析。
[Abstract]:In recent years, with the development of economy in China, tunnel fire occurs frequently. The high temperature of fire causes damage to tunnel lining structure and reduces the safety of tunnel lining structure. Because the tunnel is a long and narrow structure and the longitudinal temperature distribution is not uniform, the internal force of the tunnel lining structure is redistributed, and there is a significant constraint effect between the lining segments along the longitudinal direction. Therefore, it is of great practical value to study the fire resistance of tunnel lining under non-uniform fire conditions. In this paper, a three-dimensional finite element model of tunnel lining structure is established by using the finite element software Abaqus. Through numerical simulation, the variation law of lining displacement and internal force with fire time and the fire resistance limit of the structure are obtained. The main contents are as follows: 1. On the basis of analyzing and summarizing the research results at home and abroad, the thermal properties and thermodynamic models of materials at high temperature were selected. 2. The three-dimensional analysis model of tunnel lining structure is established by using finite element ABAQUS software. The results of temperature field and mechanical calculation are verified by test data. 3. The response of tunnel lining structure under non-uniform distribution of longitudinal temperature is analyzed by using the verified model. 4. The effects of longitudinal restraint, fire peak temperature, heating rate, ground overload, lateral pressure coefficient, strength grade of reinforcement and strength of concrete on deformation and internal force of tunnel lining are studied. 5. In this paper, three kinds of fire resistance criteria are compared, and the parameters of fire resistance limit are analyzed by using temperature control criterion.
【學(xué)位授予單位】：蘇州科技學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U458;U451.4

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