本文選題：多尺度 + 殘余應(yīng)力�。� 參考：《武漢理工大學(xué)》2015年碩士論文

【摘要】：隨著我國(guó)鐵路運(yùn)營(yíng)里程的不斷增長(zhǎng),大型鐵路橋梁的建設(shè)量不斷增加,多數(shù)鐵路橋梁采用焊接鋼結(jié)構(gòu)型式,由于在列車行走的長(zhǎng)期作用下,鐵路鋼橋節(jié)點(diǎn)焊縫區(qū)域累積疲勞損傷隨時(shí)可能發(fā)生,疲勞破壞不同于一般的結(jié)構(gòu)破壞,破壞前沒(méi)有明顯的塑性變形,一般性的檢查難以發(fā)現(xiàn)也難以采取預(yù)防措施,是橋梁安全的重大威脅,因此鐵路鋼橋的疲勞尤其是焊縫區(qū)域的疲勞需要給予特別的重視。本文以銅九線鄱陽(yáng)湖大橋?yàn)楣こ瘫尘罢归_(kāi)對(duì)鐵路鋼橋考慮焊接殘余應(yīng)力和列車過(guò)橋荷載共同作用下的疲勞裂紋萌生壽命評(píng)估和壽命控制的研究。根據(jù)對(duì)國(guó)內(nèi)外現(xiàn)有的對(duì)鐵路鋼橋節(jié)點(diǎn)焊縫區(qū)域疲勞裂紋萌生壽命評(píng)估與壽命控制的研究現(xiàn)狀分析,結(jié)合目前的研究的實(shí)際,本文主要對(duì)以下幾個(gè)方面進(jìn)行了研究:首先,本文介紹了相關(guān)的工程背景,采用基于子模型法的多尺度分析方法建立鐵路鋼橋的殼-實(shí)體多尺度有限元模型,對(duì)鐵路鋼橋考慮焊接殘余應(yīng)力和列車荷載共同作用下的響應(yīng)進(jìn)行分析,確定疲勞危險(xiǎn)點(diǎn)。然后,采用適用于考慮焊接殘余應(yīng)力下鐵路鋼橋節(jié)點(diǎn)焊縫區(qū)域的基于臨界面的多軸疲勞裂紋萌生壽命評(píng)估方法,對(duì)銅九線鄱陽(yáng)湖大橋進(jìn)行考慮焊接殘余應(yīng)力的鐵路鋼橋列車荷載作用下的裂紋萌生壽命評(píng)估。最后,本文將橋梁智能控制理論和方法應(yīng)用于鐵路鋼橋的壽命控制,通過(guò)在鐵路鋼橋各跨跨中設(shè)置MR-TMD智能控制系統(tǒng),使用編寫的控制程序分析出粗糙的殼體全橋模型在精確節(jié)點(diǎn)邊界處的位移時(shí)程響應(yīng),并通過(guò)子模型法將控制后的位移邊界時(shí)程作用在精確實(shí)體模型上,獲得控制后節(jié)點(diǎn)焊縫區(qū)域的精確應(yīng)力狀態(tài),從而獲得控制后的鐵路鋼橋節(jié)點(diǎn)焊縫區(qū)域的疲勞裂紋萌生壽命。綜上所述,本文的研究將橋梁結(jié)構(gòu)疲勞裂紋萌生壽命評(píng)估方法和智能控制理論有效結(jié)合,建立一套完整的列車行走作用下鐵路鋼橋節(jié)點(diǎn)焊縫區(qū)域疲勞裂紋萌生壽命評(píng)估方法和延長(zhǎng)其壽命的智能控制的理論,對(duì)改善鐵路鋼橋的抗疲勞破壞能力、降低鐵路鋼橋維護(hù)成本方面和重特大事故的預(yù)防方面有一定的經(jīng)濟(jì)和社會(huì)效益。
[Abstract]:With the increasing mileage of railway operation in our country, the construction of large railway bridges is increasing. Most railway bridges adopt welded steel structure, because of the long-term action of train running, The cumulative fatigue damage may occur at any time in the weld zone of the joint of railway steel bridge. The fatigue damage is different from that of the normal structure. There is no obvious plastic deformation before the damage, and the general inspection is difficult to find and take preventive measures. It is a great threat to bridge safety, so the fatigue of railway steel bridge, especially the fatigue of weld zone, should be paid more attention. In this paper, the fatigue crack initiation life evaluation and life control of the railway steel bridge under the joint action of welding residual stress and train crossing load are carried out under the engineering background of Poyang Lake Bridge of Tongjiu Line. Based on the analysis of the current research situation of fatigue crack initiation life assessment and life control in the weld zone of railway steel bridge joints at home and abroad, combined with the current research practice, this paper mainly studies the following aspects: first, In this paper, the engineering background is introduced, and the multi-scale finite element model of the steel bridge is established by using the multi-scale analysis method based on the sub-model method. The response of railway steel bridge under the joint action of welding residual stress and train load is analyzed to determine the fatigue danger point. Then, a multiaxial fatigue crack initiation life evaluation method based on the interface is adopted, which is suitable for the weld zone of the joint of railway steel bridge considering the welding residual stress. The crack initiation life of the railway steel bridge under train load considering welding residual stress was evaluated for Poyang Lake Bridge of Tongjiu Line. Finally, this paper applies the theory and method of bridge intelligent control to the life control of railway steel bridge. By setting up MR-TMD intelligent control system in each span of railway steel bridge, The displacement-time history response of the rough shell full-bridge model at the precise node boundary is analyzed by using the control program, and the controlled displacement boundary time-history is acted on the precise entity model by the submodel method. The precise stress state of the weld zone after the control is obtained, and the fatigue crack initiation life of the welded joint area of the railway steel bridge after the control is obtained. To sum up, this paper combines the fatigue crack initiation life evaluation method of bridge structure and intelligent control theory effectively. A set of complete evaluation methods of fatigue crack initiation life and intelligent control theory of fatigue crack initiation in weld zone of railway steel bridge joint under the action of train running are established, which can improve the fatigue failure resistance of railway steel bridge. It has certain economic and social benefits to reduce the maintenance cost of railway steel bridges and to prevent serious accidents.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441.4

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