【摘要】：隨著經(jīng)濟(jì)的不斷發(fā)展,大跨度網(wǎng)殼結(jié)構(gòu)在建筑工程實(shí)踐中已得到非常廣泛的運(yùn)用。與此同時(shí)網(wǎng)殼結(jié)構(gòu)越來(lái)越容易遭受沖擊作用,沖擊荷載作用時(shí)間短、峰值大,可能導(dǎo)致劇烈的損害以及給人們的心理帶來(lái)極其嚴(yán)重的負(fù)面影響。由于計(jì)算機(jī)技術(shù)的不斷完善,使用數(shù)值算法研究網(wǎng)殼結(jié)構(gòu)的抗沖擊成為可能。在網(wǎng)殼抗沖擊領(lǐng)域,鑒于以前的學(xué)者研究的網(wǎng)殼跨度均較小,且研究對(duì)象僅限于單層網(wǎng)殼,遠(yuǎn)遠(yuǎn)不能滿足實(shí)際大跨度網(wǎng)殼結(jié)構(gòu)工程實(shí)踐的需求,本文正是在此背景下,系統(tǒng)研究大跨度網(wǎng)殼的抗沖擊性能,具體內(nèi)容如下:1建立了單層球面網(wǎng)殼與雙層球面網(wǎng)殼有限元模型本文介紹了有限元軟件ANSYS/LS-DYNA中分析沖擊作用的相關(guān)基礎(chǔ)理論,定義了單元類型、材料屬性,提出了基本假設(shè),建立各種沖擊荷載特征情況下的單層球面網(wǎng)殼與雙層球面網(wǎng)殼合理數(shù)值分析模型。2研究沖擊物尺寸與材料屬性對(duì)網(wǎng)殼失效模式的影響本文研究了網(wǎng)殼結(jié)構(gòu)失效模式隨沖擊物的尺寸以及材料屬性等參數(shù)改變的變化規(guī)律,總結(jié)了網(wǎng)殼結(jié)構(gòu)的失效模式與吸收沖擊物動(dòng)能的定性關(guān)系,探討了沖擊物尺寸效應(yīng)與材料屬性如何對(duì)網(wǎng)殼結(jié)構(gòu)的失效模式形成的影響。3研究大跨度球面網(wǎng)殼結(jié)構(gòu)沖擊動(dòng)力響應(yīng)及失效模式分布結(jié)合沖擊作用下球面網(wǎng)殼三種失效模式的典型算例,考察每種失效模式的沖擊動(dòng)力響應(yīng)的特點(diǎn)。本文考察了屋面荷載、網(wǎng)殼跨度和桿件截面等參數(shù)變化對(duì)網(wǎng)殼結(jié)構(gòu)失效模式的影響。4提出評(píng)價(jià)網(wǎng)殼抗沖擊能力的新方法以沖擊物的動(dòng)能變化為基礎(chǔ),綜合考慮不同沖擊響應(yīng)模式間的轉(zhuǎn)換規(guī)律,結(jié)果表明,網(wǎng)殼結(jié)構(gòu)的沖擊響應(yīng)模式隨沖擊物的動(dòng)能呈規(guī)律性變化,進(jìn)而提出一種評(píng)價(jià)的新方法。
[Abstract]:With the development of economy, long span latticed shell structure has been widely used in construction engineering. At the same time, the latticed shell structure is more and more vulnerable to the impact, the impact load time is short, the peak value is large, which may lead to severe damage and bring extremely serious negative impact to people's psychology. With the improvement of computer technology, it is possible to study the impact resistance of latticed shell by numerical algorithm. In the field of shock resistance of latticed shells, in view of the small span of latticed shells studied by previous scholars and the fact that the research object is limited to single-layer latticed shells, it is far from being able to meet the needs of the engineering practice of practical large-span latticed shell structures. The main contents of this paper are as follows: 1. The finite element models of single-layer reticulated shell and double-layer reticulated shell are established. In this paper, the basic theory of impact analysis in finite element software ANSYS/LS-DYNA is introduced. Defines the element type, material properties, presents the basic assumptions, The reasonable numerical analysis models of single-layer spherical reticulated shell and double-layer spherical reticulated shell under various impact load characteristics are established. 2 the effects of impact size and material properties on the failure mode of reticulated shell are studied in this paper. The pattern changes with the size of the impact material and the properties of the material. The qualitative relationship between the failure mode of latticed shell structure and the kinetic energy of absorbing shock is summarized. The influence of impact size effect and material properties on the formation of failure mode of reticulated shell structure is discussed. 3 the dynamic response of large span spherical reticulated shell structure and failure mode distribution combined with impact mode are studied. Typical examples of failure modes, The characteristics of impact dynamic response of each failure mode are investigated. In this paper, the influence of roof load, shell span and member section on the failure mode of latticed shell structures is investigated. 4 A new method for evaluating the impact resistance of latticed shells is proposed, which is based on the kinetic energy change of the impact material. Considering the transformation law of different shock response modes, the results show that the shock response modes of latticed shell structure change regularly with the kinetic energy of shock material, and a new evaluation method is put forward.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU399

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本文編號(hào)：2333024