【摘要】：近年來自然災(zāi)害頻頻來襲，建筑經(jīng)常會(huì)遭受到暴風(fēng)、大雪的威脅。由于網(wǎng)架結(jié)構(gòu)應(yīng)用的廣泛性及使用功能的特殊性，一旦在意外荷載作用下發(fā)生連續(xù)倒塌，將會(huì)給社會(huì)生產(chǎn)和人民生命財(cái)產(chǎn)安全造成及其重大的損失。因此，對(duì)網(wǎng)架結(jié)構(gòu)抗連續(xù)性倒塌的研究具有重大意義和深遠(yuǎn)影響。 對(duì)于網(wǎng)架結(jié)構(gòu)的抗連續(xù)倒塌性能研究主要圍繞如下兩個(gè)方面： （1）已有的網(wǎng)架結(jié)構(gòu)是否擁有足夠的承載能力，確保在意外荷載作用下不發(fā)生連續(xù)性倒塌； （2）如何利用科學(xué)合理的設(shè)計(jì)理念及方法設(shè)計(jì)出能夠抵抗連續(xù)性倒塌發(fā)生的網(wǎng)架結(jié)構(gòu)體系。 本文以重要桿件失效為前提，以數(shù)值模擬與模型試驗(yàn)相結(jié)合的方式，，從正放四角錐網(wǎng)架結(jié)構(gòu)連續(xù)倒塌機(jī)理出發(fā)研究了如下三個(gè)核心問題： （1）正放四角錐網(wǎng)架結(jié)構(gòu)桿件重要性評(píng)價(jià)方法研究； （2）基于重要構(gòu)件失效的正放四角錐網(wǎng)架結(jié)構(gòu)連續(xù)倒塌機(jī)理研究； （3）正放四角錐網(wǎng)架結(jié)構(gòu)抗連續(xù)倒塌設(shè)計(jì)方法研究。 針對(duì)網(wǎng)架結(jié)構(gòu)桿件眾多的特點(diǎn)，本文將結(jié)構(gòu)體系的能量變化率與桿件的響應(yīng)變化率結(jié)合起來，提出了基于概念判斷的正放四角錐網(wǎng)架結(jié)構(gòu)桿件重要性評(píng)估方法，并驗(yàn)證了判斷方法的適用性。 在四角錐網(wǎng)架結(jié)構(gòu)縮尺模型重要桿件上設(shè)計(jì)了初始失效引入裝置，進(jìn)行了重要構(gòu)件失效情況下的動(dòng)力倒塌試驗(yàn)，并基于ANSYS/LS-DYNA有限元分析平臺(tái)重現(xiàn)了試驗(yàn)?zāi)Ｐ偷倪B續(xù)倒塌過程，探索了四角錐網(wǎng)架結(jié)構(gòu)發(fā)生連續(xù)性倒塌的力學(xué)機(jī)理，同時(shí)驗(yàn)證了數(shù)值分析的準(zhǔn)確性。 基于ANSYS/LS-DYNA有限元分析平臺(tái)，對(duì)四角錐網(wǎng)架結(jié)構(gòu)實(shí)體模型分別進(jìn)行了單根、多根重要構(gòu)件失效情況下的倒塌分析。從結(jié)構(gòu)體系的失效特征、內(nèi)力重分布規(guī)律及抗倒塌承載力等方面揭示了正放四角錐網(wǎng)架結(jié)構(gòu)發(fā)生連續(xù)性倒塌的力學(xué)機(jī)理，并以此為依據(jù)，提出了基于壓桿穩(wěn)定的抗連續(xù)倒塌設(shè)計(jì)方法，且驗(yàn)證了該方法的有效性。
[Abstract]:In recent years, natural disasters frequently come, buildings are often threatened by storm and heavy snow. Because of the wide application of grid structure and the particularity of its use function, once it collapses continuously under the action of accidental load, it will cause great losses to social production and the safety of people's life and property. Therefore, it is of great significance and far-reaching influence to study the continuous collapse of truss structures. The research on the continuous collapse resistance of the truss structure is mainly focused on the following two aspects: (1) whether the existing truss structure has enough bearing capacity to ensure that the continuous collapse does not occur under the unexpected load; (2) how to use the scientific and reasonable design idea and method to design the truss structure system which can resist the continuous collapse. On the premise of failure of important members, this paper combines numerical simulation with model test. The following three key problems are studied based on the continuous collapse mechanism of forward position tetragonal conical truss structure: (1) study on the evaluation method of the importance of the truss member of the forward position tetragonal conical truss structure; (2) study on the mechanism of continuous collapse of forward position tetragonal truss structure based on failure of important components; (3) study on design method of anti-continuous collapse of forward position tetragonal conical grid structure. In view of the large number of truss members, this paper combines the energy change rate of the structure system with the response change rate of the truss, and puts forward a method for evaluating the importance of the truss members of the space grid truss based on the concept judgment. The applicability of the method is verified. The initial failure introducing device is designed on the important member of the scale model of the tetragonal conical truss structure, and the dynamic collapse test is carried out under the condition of the failure of the important member. Based on the ANSYS/LS-DYNA finite element analysis platform, the continuous collapse process of the test model is reproduced, and the mechanical mechanism of the continuous collapse of the tetragonal conical truss structure is explored, and the accuracy of the numerical analysis is verified. Based on the ANSYS/LS-DYNA finite element analysis platform, the collapse analysis of the solid model of tetragonal conical truss structure is carried out under the condition of failure of one or more important members. From the failure characteristics of structural system, internal force redistribution law and anti-collapse bearing capacity, this paper reveals the mechanical mechanism of the continuous collapse of the space truss structure with quadrilateral cones, which is based on the failure characteristics, the internal force redistribution law and the anti-collapse bearing capacity, etc. A design method for continuous collapse resistance based on compression rod stability is proposed, and the effectiveness of the method is verified.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU356

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 賈金剛;徐迎;石磊;金豐年;;關(guān)于“連續(xù)性倒塌”定義的探討[J];爆破;2008年01期

2 張冬茵,金星,丁海平,孔戈;ANSYS/LS-DYNA在地震工程中的應(yīng)用[J];地震工程與工程振動(dòng);2005年04期

3 胡曉斌;錢稼茹;;單層平面鋼框架連續(xù)倒塌動(dòng)力效應(yīng)分析[J];工程力學(xué);2008年06期

4 蔡建國(guó);王蜂嵐;馮健;張晉;馮飛;;大跨空間結(jié)構(gòu)連續(xù)倒塌分析若干問題探討[J];工程力學(xué);2012年03期

5 蔡建國(guó);王蜂嵐;馮健;韓運(yùn)龍;;建筑結(jié)構(gòu)連續(xù)倒塌概念設(shè)計(jì)[J];工業(yè)建筑;2011年02期

6 趙廣坡;肖克艱;馮遠(yuǎn);陳志強(qiáng);熊耀清;羅昱;;成都雙流國(guó)際機(jī)場(chǎng)T2航站樓大廳陸側(cè)大跨鋼結(jié)構(gòu)抗連續(xù)倒塌分析[J];建筑結(jié)構(gòu);2010年09期

7 易偉建;何慶鋒;肖巖;;鋼筋混凝土框架結(jié)構(gòu)抗倒塌性能的試驗(yàn)研究[J];建筑結(jié)構(gòu)學(xué)報(bào);2007年05期

8 清華大學(xué)土木工程結(jié)構(gòu)專家組;西南交通大學(xué)土木工程結(jié)構(gòu)專家組;北京交通大學(xué)土木工程結(jié)構(gòu)專家組;葉列平;陸新征;;汶川地震建筑震害分析[J];建筑結(jié)構(gòu)學(xué)報(bào);2008年04期

9 蔡建國(guó);王蜂嵐;馮健;張晉;黃利鋒;盛平;甄偉;陳強(qiáng);;新廣州站索拱結(jié)構(gòu)屋蓋體系連續(xù)倒塌分析[J];建筑結(jié)構(gòu)學(xué)報(bào);2010年07期

10 汪毅俊;吳慧;;基于網(wǎng)架結(jié)構(gòu)極限承載力的優(yōu)化設(shè)計(jì)方法[J];空間結(jié)構(gòu);2010年03期

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