本文關鍵詞：重載交通作用下橋梁結(jié)構的疲勞損傷數(shù)值分析　出處：《河北工業(yè)大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 重載交通 疲勞損傷 隨機車流 疲勞車 應力幅

【摘要】：我國是一個橋梁大國,橋梁結(jié)構的安全運營關系著國民經(jīng)濟健康、高質(zhì)量的發(fā)展,近年來隨著公路交通運輸事業(yè)的快速發(fā)展,各地公路橋梁上運行的汽車載重均有了不同程度的增長。工程結(jié)構事故中,因疲勞損傷破壞而引發(fā)的事故占據(jù)著很大的比例,且結(jié)構的疲勞破壞在宏觀上屬于脆性破壞,在破壞之前沒有明顯的征兆。橋梁在晝夜不停的重載車輛往復行駛作用下必然會遭受到疲勞損傷,且車輛載重的增加會引起疲勞應力幅的增加,疲勞應力幅是影響結(jié)構疲勞壽命的一個重要因素。因而對橋梁結(jié)構進行重載交通作用下的疲勞損傷分析有其必要性,對于我們實時掌握橋梁的安全運營狀況有著重要的參考依據(jù)。本文圍繞著重載交通對橋梁結(jié)構的疲勞損傷問題,開展了相關的研究工作。針對橋梁結(jié)構遭受疲勞破壞的工程事故以及重載交通運輸現(xiàn)狀做了介紹,收集整理了國內(nèi)外關于橋梁疲勞性能的研究進展資料。研究總結(jié)了預應力鋼筋混凝土橋梁疲勞破壞的機理和疲勞壽命分析的方法理論。根據(jù)實地交通調(diào)查的數(shù)據(jù)結(jié)果,進行統(tǒng)計分析,找出了隨機車輛的分布規(guī)律,為了模擬橋梁上實際運營的車輛對橋梁產(chǎn)生的疲勞損傷,本文借助Matlab軟件,結(jié)合車輛的分布規(guī)律,編寫了隨機車流生成程序,通過參數(shù)化設置,可以生成符合不同需求的隨機車流。根據(jù)線性疲勞累積損傷原理,建立了適用于調(diào)查路段橋梁的標準疲勞車模型。運用大型有限元分析軟件,建立了16m預應力鋼筋混凝土空心板梁的實體有限元模型,并用宏命令編寫了隨機車流加載程序JIAZAI,實現(xiàn)了將Matlab生成的隨機車流加載到有限元模型上模擬隨機車輛過橋。運用瞬態(tài)動力分析方法進行車輛過橋的加載求解,運用線性疲勞累積損傷理論,通過模擬各典型車輛在不同車間距以及不同過橋速度情況下的疲勞損傷,對比了車速以及車間距對橋梁疲勞損傷的影響。將一般運營狀態(tài)下和密集運營狀態(tài)下的隨機車流加載到有限元模型上,對比了兩者的不同影響,分析對比了標準疲勞車作用與一般運營狀態(tài)下的等效應力幅。
[Abstract]:Our country is a big country of bridge, the safe operation of bridge structure is related to the healthy and high quality development of national economy. In recent years, with the rapid development of highway transportation. In the engineering structure accidents, the accidents caused by fatigue damage occupy a large proportion. And the fatigue damage of the structure belongs to brittle failure in macroscopic, and there is no obvious sign before the failure. The bridge will suffer fatigue damage under the action of the heavy load vehicle driving around the clock. And the increase of vehicle load will cause the increase of fatigue stress amplitude. The fatigue stress amplitude is an important factor affecting the fatigue life of the structure, so it is necessary to analyze the fatigue damage of the bridge structure under the heavy load traffic. This paper focuses on the fatigue damage of bridge structure caused by heavy load traffic. The related research work is carried out. The engineering accident of fatigue damage of bridge structure and the current situation of heavy haul traffic and transportation are introduced. This paper collected and sorted out the research progress data of bridge fatigue performance at home and abroad, summarized the fatigue failure mechanism and fatigue life analysis method theory of prestressed reinforced concrete bridge, and based on the data of field traffic investigation, summarized the fatigue failure mechanism of prestressed reinforced concrete bridge and the method theory of fatigue life analysis. The result. Statistical analysis to find out the distribution of random vehicles, in order to simulate the actual operation of the bridge vehicle fatigue damage to the bridge, this paper with the help of Matlab software, combined with the distribution law of vehicles. A program for generating random traffic flow is written. By parameterized setting, random traffic flow can be generated according to different requirements, according to the principle of linear fatigue cumulative damage. The standard fatigue vehicle model suitable for the investigation of bridges is established and the solid finite element model of 16m prestressed reinforced concrete hollow slab beam is established by using the large-scale finite element analysis software. The random traffic loading program JIAZAI is written with macro command. The random vehicle flow generated by Matlab is loaded into the finite element model to simulate the random vehicle crossing bridge. The transient dynamic analysis method is used to solve the loading problem of the bridge and the linear fatigue cumulative damage theory is used. The fatigue damage of typical vehicles under different vehicle spacing and crossing speed is simulated. The effects of vehicle speed and vehicle spacing on fatigue damage of bridges are compared. The random traffic flow in general operation state and in dense operation state is loaded into the finite element model, and the different effects are compared. The equivalent stress amplitude of the standard fatigue vehicle is analyzed and compared with that of the normal operation state.
【學位授予單位】：河北工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441.4

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相關期刊論文 前1條

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本文編號：1438832