發(fā)布時(shí)間：2018-01-19 20:26

  本文關(guān)鍵詞： 鋼管混凝土系桿拱橋 復(fù)合式吊桿 車輛荷載 隨機(jī)車流 疲勞性能　出處：《長安大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本文通過對公路橋梁車輛荷載調(diào)查與統(tǒng)計(jì)方法的歸納分析,基于蒙特卡羅法構(gòu)建了數(shù)值模擬形式的疲勞荷載譜,采用不同的疲勞荷載譜對鋼管混凝土系桿拱橋吊桿的疲勞性能研究,并結(jié)合實(shí)橋工程復(fù)合式吊桿的構(gòu)造特征,分析成品索和鋼套管吊桿的應(yīng)力幅變化規(guī)律以及相應(yīng)的疲勞特性,為復(fù)合式吊桿的設(shè)計(jì)與使用維護(hù)提供技術(shù)指導(dǎo)。主要研究內(nèi)容如下:(1)基于對數(shù)理統(tǒng)計(jì)基本理論的歸納分析,明確對車輛荷載調(diào)查數(shù)據(jù)的統(tǒng)計(jì)方法;在對疲勞概念、疲勞分類、疲勞破壞機(jī)理與疲勞荷載模型、疲勞分析理論等歸納分析的基礎(chǔ)上,推薦傳統(tǒng)疲勞分析法作為實(shí)橋工程復(fù)合式吊桿疲勞性能研究的基本方法,為本文的研究提供理論指導(dǎo)。(2)基于數(shù)理統(tǒng)計(jì)的基本理論,對借用的車輛荷載調(diào)查數(shù)據(jù)統(tǒng)計(jì)分析,確定疲勞車輛荷載相關(guān)要素(車流量、車重、車間距、軸重與軸距分配比例)的分布類型與統(tǒng)計(jì)參數(shù)�；诿商乜_法的基本思想,生成一般運(yùn)行狀態(tài)下隨機(jī)車流形式的車輛疲勞荷載譜,為公路鋼橋抗疲勞設(shè)計(jì)分析提供荷載模式。(3)采用MATLAB軟件編制基于蒙特卡羅法的隨機(jī)車流模擬程序、基于隨機(jī)車流影響線加載的應(yīng)力歷程計(jì)算程序和基于雨流計(jì)數(shù)法的應(yīng)力幅統(tǒng)計(jì)程序,為復(fù)合式吊桿疲勞性能的分析與計(jì)算提供技術(shù)支持。(4)以實(shí)橋工程為依托,選取車輛疲勞荷載譜形成隨機(jī)車流,對典型吊桿的應(yīng)力影響線加載,計(jì)算得到成品索和鋼套管吊桿的應(yīng)力幅概率分布;基于線性疲勞累積損傷理論,通過推薦成品索和鋼套管吊桿的疲勞強(qiáng)度S-N曲線,計(jì)算了典型吊桿的疲勞累積損傷度,探討了鋼管混凝土系桿拱橋復(fù)合式吊桿的疲勞破壞規(guī)律。
[Abstract]:In this paper, the fatigue load spectrum in the form of numerical simulation is constructed based on Monte Carlo method through the induction and analysis of vehicle load investigation and statistical method of highway bridge. The fatigue behavior of suspension rod of concrete-filled steel tubular tied arch bridge is studied by using different fatigue load spectrum, and combined with the structural characteristics of composite suspension rod in real bridge engineering. The variation law of stress amplitude and the corresponding fatigue characteristics of finished cable and steel casing boom are analyzed. The main research contents are as follows: (1) based on the induction and analysis of the basic theory of mathematical statistics, the statistical method of vehicle load survey data is clear; Based on the analysis of fatigue concept, fatigue classification, fatigue failure mechanism and fatigue load model, fatigue analysis theory and so on. The traditional fatigue analysis method is recommended as the basic method to study the fatigue performance of composite suspenders in real bridge engineering, which provides theoretical guidance for the research of this paper. (2) the basic theory based on mathematical statistics. Based on the statistical analysis of borrowed vehicle load data, the relevant factors of fatigue vehicle load (vehicle flow, vehicle weight, vehicle spacing) are determined. Based on the basic idea of Monte Carlo method, the vehicle fatigue load spectrum in the form of random vehicle flow in general running state is generated. Provide load mode for fatigue design analysis of highway steel bridge. Use MATLAB software to compile the simulation program of random traffic flow based on Monte Carlo method. The calculation program of stress history based on random train flow influence line and the statistical program of stress amplitude based on rain flow counting method. Provide technical support for the analysis and calculation of the fatigue performance of composite suspenders. Based on the real bridge engineering, select the fatigue load spectrum of vehicles to form random traffic flow, and load the stress influence line of typical suspenders. The probability distribution of stress amplitude of the finished cable and steel casing boom is calculated. Based on the theory of linear fatigue cumulative damage, the fatigue cumulative damage degree of typical suspension rod is calculated by recommending S-N curve of fatigue strength of finished cable and steel casing boom. The fatigue failure law of composite suspenders of concrete-filled steel tubular tied arch bridge is discussed.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441.4;U448.225

【共引文獻(xiàn)】

相關(guān)期刊論文 前4條

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2 王文閣;盧延輝;;實(shí)用概率Miner理論及在汽車部件疲勞計(jì)算上的應(yīng)用[J];汽車技術(shù);2009年12期

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本文編號(hào)：1445429