本文選題：被動(dòng)柔性防護(hù)網(wǎng)結(jié)構(gòu) + 環(huán)形網(wǎng)片�。� 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：我國(guó)地勢(shì)西高東低,地質(zhì)構(gòu)造多樣,隨著近些年的氣候變化,地質(zhì)災(zāi)害多發(fā),其中崩塌落石因其發(fā)生突然、發(fā)生頻率高、高沖擊動(dòng)能等,對(duì)山區(qū)交通干線、城鎮(zhèn)等構(gòu)成了嚴(yán)重的威脅。廣大技術(shù)人員根據(jù)現(xiàn)場(chǎng)實(shí)際的崩塌落石發(fā)育特點(diǎn)以及地形地質(zhì)條件積累了大量的實(shí)際應(yīng)用經(jīng)驗(yàn),其中被動(dòng)柔性防護(hù)網(wǎng)結(jié)構(gòu)以其施工方便、干擾小、標(biāo)準(zhǔn)化生產(chǎn)、造價(jià)低、實(shí)用性強(qiáng)等眾多特點(diǎn)在實(shí)際工程中被廣泛應(yīng)用。環(huán)形網(wǎng)片是被動(dòng)柔性防護(hù)網(wǎng)結(jié)構(gòu)的重要組成部分之一,而在實(shí)際工程應(yīng)用中經(jīng)常出現(xiàn)環(huán)形網(wǎng)片被擊穿的破壞現(xiàn)象。本文以環(huán)形網(wǎng)片構(gòu)件為研究對(duì)象,通過(guò)理論推導(dǎo)、數(shù)值模擬和試驗(yàn)數(shù)據(jù)對(duì)比分析等手段對(duì)環(huán)形網(wǎng)片進(jìn)行了基礎(chǔ)性的研究,本文主要完成了以下工作。(1)以材料與結(jié)構(gòu)的能量吸收方面的相關(guān)理論為基礎(chǔ),理論推導(dǎo)了單個(gè)圓環(huán)在二力、四力和六力作用下的理論耗能公式,并與現(xiàn)有的文獻(xiàn)結(jié)果進(jìn)行了對(duì)比分析,證明了本文理論推導(dǎo)的正確性,為環(huán)形網(wǎng)片的耗能研究提供了一定的理論基礎(chǔ)。(2)通過(guò)ANSYS/LS-DYNA軟件建立與文獻(xiàn)中同等尺寸、同等邊界條件、同等沖擊過(guò)程的環(huán)形網(wǎng)片,分別進(jìn)行24kJ和45kJ作用下的落石沖擊分析,將得到的數(shù)據(jù)與文獻(xiàn)中的試驗(yàn)結(jié)果進(jìn)行對(duì)比,證明了文中數(shù)值仿真建模的正確性,為數(shù)值分析環(huán)形網(wǎng)片的動(dòng)力響應(yīng)和耗能情況提供了一套合理的建模方法。(3)通過(guò)利用試驗(yàn)數(shù)據(jù)驗(yàn)證過(guò)的建模方法建立3.3m×6.6m的環(huán)形網(wǎng)片。首先,進(jìn)行三種邊界約束形式下的數(shù)值分析,對(duì)比落石沖擊環(huán)形網(wǎng)片的動(dòng)力響應(yīng)和各種約束形式下的最大耗能;然后,分析是否考慮落石重力對(duì)環(huán)形網(wǎng)片耗能性能的影響,分為三種情況對(duì)其進(jìn)行研究;最后,分析環(huán)形網(wǎng)片在落石不同沖擊角度下的動(dòng)力響應(yīng)和耗能情況,根據(jù)沖擊角度的不同,分為五種情況進(jìn)行研究。(4)通過(guò)改變橫、縱向的圓環(huán)數(shù)目建立不同尺寸的環(huán)形網(wǎng)片,分析落石垂直沖擊中間位置時(shí)的受荷區(qū)域分布規(guī)律,定量的給出環(huán)形網(wǎng)片的理論耗能計(jì)算公式,為基于能量的整體防護(hù)結(jié)構(gòu)體系設(shè)計(jì)提供一定的理論基礎(chǔ)。
[Abstract]:With the climate change in recent years, geological disasters occur frequently in China, in which the collapse and falling stone occur suddenly, high frequency, high impact kinetic energy, etc., on the main traffic lines in mountainous areas. Towns and cities pose a serious threat. The vast number of technicians have accumulated a great deal of practical application experience according to the development characteristics of collapsing and falling rocks and the topographic and geological conditions. Among them, the passive flexible protective net structure has the advantages of convenient construction, small interference, standardized production and low cost. Many characteristics, such as strong practicability, are widely used in practical engineering. Annular mesh is one of the important parts of passive flexible protective net structure, and the breakdown of annular mesh is often occurred in practical engineering application. In this paper, the annular mesh component is taken as the research object, and the basic research is carried out by means of theoretical derivation, numerical simulation and comparative analysis of experimental data. Based on the theory of energy absorption of materials and structures, the theoretical energy dissipation formulas of a single ring under the action of two, four and six forces are derived. By comparing the results with the existing literatures, it is proved that the theoretical derivation of this paper is correct, which provides a theoretical basis for the study of energy dissipation in annular mesh. (2) the same size and boundary conditions as in the literature are established by using ANSYS/LS-DYNA software. Under the action of 24kJ and 45kJ, the annular mesh of the same impact process is analyzed respectively. The results obtained are compared with the experimental results in the literature, which proves the correctness of the numerical simulation modeling in this paper. A set of reasonable modeling method is provided for the numerical analysis of the dynamic response and energy dissipation of annular mesh. The annular mesh with 3.3m 脳 6.6m is established by using the modeling method verified by the experimental data. Firstly, the numerical analysis of three kinds of boundary constraint forms is carried out to compare the dynamic response and the maximum energy consumption under various constraint forms of the annular mesh, and then, whether to consider the influence of the falling gravity on the energy dissipation performance of the annular mesh is analyzed. Finally, the dynamic response and energy dissipation of annular mesh at different impact angles are analyzed. According to the impact angle, it is divided into five situations. The number of rings in longitudinal direction is used to establish annular mesh with different sizes, and the distribution law of the loading area at the middle position of vertical impact is analyzed, and the theoretical energy consumption formula of the annular mesh is given quantitatively. It provides a theoretical basis for the design of the whole protection structure based on energy.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U417.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉成清;倪向勇;楊萬(wàn)理;李福海;趙世春;;基于能量法的被動(dòng)柔性棚洞防護(hù)結(jié)構(gòu)設(shè)計(jì)理論[J];工程力學(xué);2016年11期

2 劉成清;田帥;陳馳;何廣杰;趙必大;;減壓環(huán)在被動(dòng)柔性防護(hù)網(wǎng)中的耗能作用研究[J];鐵道標(biāo)準(zhǔn)設(shè)計(jì);2016年09期

3 劉成清;陳林雅;齊欣;;落石沖擊作用下不同連接方式被動(dòng)防護(hù)網(wǎng)的受力分析[J];中國(guó)鐵道科學(xué);2016年02期

4 劉成清;陳林雅;陳馳;鄧永祥;;被動(dòng)柔性防護(hù)網(wǎng)中減壓環(huán)力學(xué)試驗(yàn)及有限元分析[J];巖石力學(xué)與工程學(xué)報(bào);2016年06期

5 劉成清;陳林雅;;被動(dòng)柔性防護(hù)網(wǎng)在邊坡防護(hù)中的工程應(yīng)用與研究[J];公路;2015年06期

6 劉成清;陳林雅;陳馳;李俊君;趙世春;;柔性鋼棚洞結(jié)構(gòu)在落石災(zāi)害防治中的應(yīng)用研究[J];西南交通大學(xué)學(xué)報(bào);2015年01期

7 陳馳;劉成清;陳林雅;趙世春;;落石作用于鋼筋混凝土棚洞的沖擊力研究[J];公路交通科技;2015年01期

8 劉成清;陳林雅;陳馳;韋韜;;落石沖擊作用下被動(dòng)柔性防護(hù)網(wǎng)整體結(jié)構(gòu)試驗(yàn)[J];中國(guó)地質(zhì)災(zāi)害與防治學(xué)報(bào);2014年04期

9 劉成清;陳馳;;落石沖擊作用下鋼筋混凝土棚洞結(jié)構(gòu)的動(dòng)力系數(shù)研究[J];施工技術(shù);2014年17期

10 申文軍;劉成林;劉昌宏;李曉杰;;分離式被動(dòng)防護(hù)網(wǎng)整治山體危石應(yīng)用研究[J];鐵道工程學(xué)報(bào);2013年05期

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