本文選題：疲勞可靠度 + 鋼箱梁��； 參考：《長沙理工大學(xué)》2014年碩士論文

【摘要】：在運(yùn)營期的反復(fù)車輛荷載作用下,橋梁結(jié)構(gòu)面臨著疲勞損傷的問題�？紤]到結(jié)構(gòu)參數(shù)與荷載的隨機(jī)性,橋梁結(jié)構(gòu)的疲勞破壞具有一定的概率特征。作為國內(nèi)最大跨度的獨(dú)塔自錨式懸索橋—平勝大橋鋼梁箱結(jié)構(gòu)正交異性橋面板的疲勞可靠性值得進(jìn)行安全評估。由于平勝大橋已經(jīng)安裝健康監(jiān)測系統(tǒng),該系統(tǒng)能夠提供鋼橋面板的疲勞應(yīng)力數(shù)據(jù),這為平勝大橋鋼箱梁橋面板的疲勞可靠度評估提供了有利條件。為了研究大跨度獨(dú)塔自錨式懸索橋的鋼箱梁構(gòu)造細(xì)節(jié)在隨機(jī)荷載作用下的疲勞可靠度,以國內(nèi)最大跨度的獨(dú)塔自錨式懸索橋—平勝大橋?yàn)楣こ瘫尘?在健康監(jiān)測應(yīng)力數(shù)據(jù)的基礎(chǔ)上采用疲勞可靠度理論對其鋼箱梁橋面板構(gòu)造細(xì)節(jié)疲勞性能進(jìn)行了研究。首先基于Palmegren-Miner線性累積損傷準(zhǔn)則建立了疲勞可靠度的極限狀態(tài)方程,其次基于平勝大橋健康監(jiān)測的典型應(yīng)力和溫度數(shù)據(jù)建立了疲勞應(yīng)力譜,最后分析了不同交通量增長系數(shù)下平勝大橋鋼箱梁細(xì)節(jié)疲勞可靠度。論文的主要研究內(nèi)容與研究成果包括：(1)簡述了鋼結(jié)構(gòu)疲勞可靠度理論與相應(yīng)的分析方法。以S-N曲線和Miner線性損傷準(zhǔn)則為基礎(chǔ),建立疲勞損傷的極限狀態(tài)方程,并給出疲勞可靠度評估的關(guān)鍵步驟。主要從結(jié)構(gòu)可靠度理論及其分析方法、鋼箱梁的疲勞性能和疲勞可靠度評估方法三個方面展開討論。針對疲勞可靠度分析的極限狀態(tài)表達(dá)式,本文重點(diǎn)介紹了結(jié)構(gòu)可靠度分析中的JC方法,該方法為后文對疲勞可靠指標(biāo)計算奠定基礎(chǔ)。從鋼箱梁結(jié)構(gòu)的疲勞性能入手,建立鋼結(jié)構(gòu)疲勞失效的極限狀態(tài)方程,對3個重要的疲勞失效準(zhǔn)則進(jìn)行了討論。從目前疲勞可靠度評估方法的綜述中給出本文疲勞可靠度評估的流程圖。(2)針對平勝大橋健康監(jiān)測系統(tǒng)的疲勞應(yīng)力進(jìn)行了統(tǒng)計分析。介紹了平勝大橋的健康監(jiān)測系統(tǒng),對平勝大橋健康監(jiān)測的整個系統(tǒng)和傳感器布置兩個方面進(jìn)行了描述。通過引入雨流計數(shù)法和谷峰方法兩種方法介紹了監(jiān)測應(yīng)力數(shù)據(jù)提取與分析方法。針對實(shí)測數(shù)據(jù)進(jìn)行了處理分析,提取了應(yīng)力循環(huán)及循環(huán)次數(shù),并對多組應(yīng)力數(shù)據(jù)進(jìn)行了統(tǒng)計分析。建立了平勝大橋疲勞荷載效應(yīng)的概率模型。采用K-S檢驗(yàn)獲取Seq和Nd的概率分布類型和分布特征值。由分析結(jié)果可知：中跨跨中BCV-5-2傳感器所在位置的疲勞損傷最大,q的均值為5.31MPa,標(biāo)準(zhǔn)差為1.58MPa,對應(yīng)的日損傷值為1.3×10-6。(3)平勝大橋的疲勞可靠度分析結(jié)果表明：平勝大橋鋼箱梁的應(yīng)力數(shù)據(jù)具有低應(yīng)力和高循環(huán)的特點(diǎn),可基于Erucode規(guī)范對構(gòu)造細(xì)節(jié)和低應(yīng)力幅值的處理方法和等效損傷得出等效應(yīng)力幅值。平勝大橋鋼箱梁細(xì)節(jié)疲勞可靠指標(biāo)為5.274；當(dāng)交通量增長系數(shù)分別為0、0.1和0.2時,平勝大橋鋼箱梁細(xì)節(jié)疲勞可靠指標(biāo)在100年后分別下降為2.305、1.681和1.395；交通量增長系數(shù)在前期對疲勞可靠指標(biāo)的影響較小,而后期對疲勞可靠指標(biāo)的影響較大。
[Abstract]:Under the operation period of repeated vehicle load, the bridge structure faces the problem of fatigue damage. Considering the randomness of the structure parameters and load, the fatigue failure of the bridge structure has certain probability characteristics. As the largest single tower self anchored suspension bridge in China - the fatigue of the orthotropic bridge deck of the steel beam box structure of the Ping Sheng Bridge Reliability is worthy of safety assessment. As the Ping Sheng bridge has installed health monitoring system, the system can provide fatigue stress data of the steel bridge deck, which provides favorable conditions for the fatigue reliability evaluation of the steel box girder bridge deck of the bridge. The fatigue reliability under the load is taken as the engineering background of the largest single tower self anchored suspension bridge in China. On the basis of the stress data of health monitoring, the fatigue reliability of the steel box girder bridge panel is studied by using the fatigue reliability theory. First, the Palmegren-Miner linear cumulative damage criterion is established. The ultimate state equation of fatigue reliability is obtained. Secondly, based on the typical stress and temperature data of the health monitoring of the bridge, the fatigue stress spectrum is established. Finally, the detailed fatigue reliability of the steel box girder of Ping Sheng Bridge under different traffic volume growth coefficients is analyzed. The main research contents and research results of this paper include: (1) the fatigue of steel structure is briefly described. Based on S-N curve and Miner linear damage criterion, the ultimate state equation of fatigue damage is established, and the key steps of fatigue reliability evaluation are given. Three aspects are discussed mainly from the structure reliability theory and its analysis method, the fatigue performance and the fatigue reliability evaluation method of the steel box girder. In view of the limit state expression of fatigue reliability analysis, this paper mainly introduces the JC method in structural reliability analysis. This method lays the foundation for the calculation of fatigue reliability index in the later text. Starting with the fatigue performance of steel box girder structure, the ultimate state equation of fatigue failure of steel structure is established, and 3 important fatigue failure criteria are entered. The flow chart of fatigue reliability evaluation in this paper is given from the summary of the current fatigue reliability evaluation methods. (2) the fatigue stress of the health monitoring system of the Ping Sheng Bridge is statistically analyzed. The health monitoring system of the Ping Sheng Bridge is introduced, and the whole system and sensor layout of the health monitoring of the bridge are two aspects. The method of monitoring stress data extraction and analysis is introduced by introducing two methods of rain flow counting and Gu Feng method. In view of the measured data, the stress cycle and cycle times are extracted, and the multi group stress data are analyzed. The probability model of the fatigue load effect of the Ping Sheng Bridge is established. The probability distribution type and distribution characteristic value of Seq and Nd are obtained by K-S test. From the analysis results, the fatigue damage of the middle span and mid span BCV-5-2 sensor is the largest, the mean value of Q is 5.31MPa, the standard deviation is 1.58MPa, and the corresponding daily damage value of 1.3 x 10-6. (3) Ping Sheng Bridge is analyzed by the fatigue reliability analysis of the bridge of Ping Sheng Bridge. The stress data of the box girder has the characteristics of low stress and high cycle, which can be based on the Erucode specification for the treatment of structural details and low stress amplitude and equivalent damage amplitude. The reliability index of the steel box girder is 5.274. When the traffic growth coefficient is divided into 0,0.1 and 0.2, the details of the steel box girder of the Ping Sheng Bridge are detailed. The reliability index of fatigue is reduced to 2.305,1.681 and 1.395 after 100 years, and the increase coefficient of traffic volume has little influence on the fatigue reliability index in the early stage, and the latter has a great influence on the reliability index of fatigue.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.4

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相關(guān)碩士學(xué)位論文 前1條

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本文編號：1935429