本文關(guān)鍵詞：柔性被動攔截網(wǎng)結(jié)構(gòu)力學性能研究　出處：《西南交通大學》2014年博士論文　論文類型：學位論文

  更多相關(guān)文章： 柔性被動攔截網(wǎng)結(jié)構(gòu) 受力性能 數(shù)值模擬 傳力機理 結(jié)構(gòu)屬性 能量匹配

【摘要】：近30年來,我國成為全球地質(zhì)災(zāi)害最嚴重的國家之一。針對量大面廣的落石、崩塌等地質(zhì)災(zāi)害,學者和工程師們提出了多種應(yīng)對措施和方法,其中,柔性攔截網(wǎng)就是一種被廣泛使用的防護措施。但是,使用表明柔性攔截網(wǎng)在實際工程中屢屢出現(xiàn)系統(tǒng)破壞、攔截失效等問題,其原因在于當前國內(nèi)對柔性攔截網(wǎng)結(jié)構(gòu)的工作機理認識不清,缺少有效的技術(shù)控制,加之其本身具有非常復雜的結(jié)構(gòu)行為,研究成果甚少。據(jù)此,以柔性被動柔性攔截網(wǎng)結(jié)構(gòu)為研究對象,采用足尺試驗與理論分析相結(jié)合的方式,對其沖擊試驗方法、計算理論、結(jié)構(gòu)力學行為和設(shè)計方法等問題展開研究,主要研究內(nèi)容和取得成果如下：其一,開展了被動柔性攔截網(wǎng)結(jié)構(gòu)抵抗落石沖擊的足尺試驗。獲得了攔截網(wǎng)結(jié)構(gòu)遭受到落石沖擊作用后,全過程受力、傳力、變形及運動特征,通過對高速攝像解構(gòu),得到了整體系統(tǒng)的變形、運動規(guī)律,揭示了主要構(gòu)件的關(guān)鍵力學行為。其二,建立了被動柔性攔截網(wǎng)結(jié)構(gòu)的數(shù)值計算理論。結(jié)合國內(nèi)外相關(guān)的構(gòu)件力學行為試驗研究數(shù)據(jù),并依據(jù)被動柔性攔截網(wǎng)結(jié)構(gòu)的整體工作性態(tài),提出了網(wǎng)片的兩階段恢復力模型、減壓環(huán)的三階段非線性模型以及支撐索的大位移滑移模擬方法,基于此,數(shù)值分析可再現(xiàn)被動柔性攔截網(wǎng)結(jié)構(gòu)抵抗落石沖擊的全過程行為。相關(guān)試驗結(jié)果的比對驗證了理論計算的正確性和有效性,為進一步拓展研究奠定了堅實理論基礎(chǔ)。其三,揭示了柔性被動攔截網(wǎng)結(jié)構(gòu)的三階段運動變形模式。具體表現(xiàn)為：落石沖擊后,鋼絲繩網(wǎng)片的初始張緊階段；網(wǎng)片大規(guī)模運動以及耗能系統(tǒng)的啟動,系統(tǒng)整體的攔截滑移階段；支撐結(jié)構(gòu)的運動,耗能系統(tǒng)的全面啟動,系統(tǒng)的整體偏擺階段。每一個運動變形階段,皆有相應(yīng)的結(jié)構(gòu)受力、傳力特征與之匹配。其四,提出了被動柔性攔截網(wǎng)結(jié)構(gòu)的自適應(yīng)變張力結(jié)構(gòu)屬性的理論定義。該理論可完整描述柔性網(wǎng)結(jié)構(gòu)的張力剛度在沖擊過程中的變化特征：落石沖擊接觸前為弱張力狀態(tài),張力剛度僅維持初始形狀：落石沖擊發(fā)生后的一定時段為張力增長狀態(tài)；耗能子系統(tǒng)啟動后,為準定常張力狀態(tài)；耗能系統(tǒng)啟動完畢后再過渡到張力增長狀態(tài)；最后為破斷狀態(tài)。據(jù)此提出了被動柔性攔截網(wǎng)結(jié)構(gòu)的歸一化性能曲線模型。最后,建立了基于能量匹配的工程設(shè)計方法。該套設(shè)計方法根據(jù)組成部件合理的能量匹配比例,針對每一種部件,采用理論解析,并結(jié)合結(jié)構(gòu)力學以及材料力學,完成其耗能配置設(shè)計,形成了柔性被動攔截網(wǎng)結(jié)構(gòu)的工程設(shè)計方法,實現(xiàn)了柔性被動攔截網(wǎng)結(jié)構(gòu)的“可設(shè)計”與“簡便設(shè)計”。試驗數(shù)據(jù)和數(shù)值計算結(jié)果的證明了該方法的可靠性。
[Abstract]:In the past 30 years, China has become one of the most serious global geological disaster countries. For the large volume of rockfall, collapse and other geological disasters, scholars and engineers put forward the corresponding measures and methods, a variety of the flexible steel net is a kind of protective measures are widely used. However, the use of that flexible interception network system failure frequently appear in the actual project, intercept and failure, the reason is that the current domestic working mechanism of flexible steel net structure is unclear, the lack of effective control technology, and its structural behavior is very complicated, very few research results. Therefore, the flexible passive flexible steel net structure as the research object the test and analysis, the combination of theory, a theoretical calculation of the impact test method, and carries out research on the mechanical behavior and design methods, the main research contents and achievements The results are as follows: first, full-scale tests carried out passive flexible steel net structure. The impact resistance of rockfall intercepting network structure subjected to rockfall impact, the whole process of force, force, deformation and movement characteristics, based on high speed camera deconstruction, the deformation, the whole system motion, reveals the key the mechanical behavior of main component. Secondly, established the numerical passive flexible steel net structure calculation theory. Combined with the mechanical behavior experimental study of relevant data at home and abroad, and according to the working state of passive flexible steel net structure, put forward the restoring force model of two stage mesh, decompression ring three phase nonlinear model and the the supporting cable of large displacement slip simulation method, based on this, the numerical analysis of the whole process behavior can be reproduced passive flexible steel net structure. The resistance of rockfall impact test results to verify the theoretical ratio The correctness and validity of the calculation, and laid a solid theoretical foundation for the further research. Thirdly, to reveal the deformation model of three stage movement of the flexible passive intercept network structure. Specific performance: the impact of rockfall, steel wire mesh of the initial tensioning stages; mesh mass movement and energy dissipation system startup, intercept slip the stage of the entire system; supporting structure movement, launched a comprehensive energy consumption system, the whole system swing stage. Every movement and deformation stage, all has the corresponding force structure, force transmission characteristics and matching. Finally, puts forward the theoretical definition of adaptive passive flexible steel net structure variable tension structure properties. The theory can be a complete description of the structure of flexible tension stiffness variation in the impact process: rockfall impact before contact is a weak state of tension, tension stiffness only maintained the initial shape of rockfall impact: A certain period of time after the occurrence of the tension growth condition; start energy subsystem, as quasi steady state tension; energy dissipation system starts after the transition to increase tension state; finally breaking state. Put forward the normalized performance curve model of passive flexible steel net structure. Finally, the establishment of energy, engineering design the method based on the design method of the matching proportion according to the components of reasonable energy, for each component, by using theoretical analysis, combined with the structural mechanics and mechanics of materials, the energy configuration design, an engineering design method of flexible passive intercept network structure, realize flexible passive interception network structure of the "design" with the simple design. The experimental data and numerical results prove the reliability of the method.

【學位授予單位】：西南交通大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TU311;TU761.1

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