發(fā)布時(shí)間：2018-04-20 06:05

  本文選題：鋼管混凝土 + 荷載譜　； 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：隨著我國(guó)進(jìn)入21世紀(jì),在改革開放的推動(dòng)下,我國(guó)基礎(chǔ)設(shè)施建設(shè)有了突飛猛進(jìn)的增長(zhǎng)。伴隨日益加劇的交通壓力,我國(guó)高速公路上的橋梁都在滿負(fù)荷運(yùn)營(yíng),并且服役時(shí)間普遍高于27年�？上攵绍囕v帶來的疲勞損傷則成為了橋梁最大的安全隱患。鋼管混凝土拱橋以其自重輕,跨越能力大,力學(xué)線條優(yōu)美受到廣大橋梁建設(shè)者的青睞。而拱橋吊桿作為橋梁結(jié)構(gòu)的主要傳力構(gòu)件,其健康狀況關(guān)系到整個(gè)橋梁的運(yùn)營(yíng)安全。因此,本文結(jié)合北京至昆明108國(guó)道線云南境內(nèi)的一處下承式鋼管混凝土拱橋?yàn)樵?利用通用有限元計(jì)算軟件MIDAS/CIVIL,模擬分析該拱橋在車輛荷載作用下其典型吊桿的疲勞性能,并通過改變拱橋設(shè)計(jì)參數(shù),提出改善拱橋吊桿疲勞設(shè)計(jì)參考意見。主要研究?jī)?nèi)容及結(jié)論如下:①運(yùn)用MATLAB軟件編程以實(shí)現(xiàn)服從對(duì)數(shù)正態(tài)分布的隨機(jī)車輛荷載譜模擬,將該荷載譜隨機(jī)作用于橋面行車道上�；�1860級(jí)鋼絞線的疲勞S—N曲線分析理論,再利用雨流計(jì)數(shù)法計(jì)算各個(gè)典型吊桿在疲勞荷載譜下的等效應(yīng)力幅以及等效應(yīng)力循環(huán)次數(shù)。并基于Miner線性損傷累積理論對(duì)該下承式系桿拱橋吊桿的疲勞壽命做出了評(píng)估,具備一定的工程參考價(jià)值。②通過改變拱橋的某些疲勞設(shè)計(jì)參數(shù)的情況下進(jìn)行了共6種情況的吊桿疲勞性能對(duì)比。分析發(fā)現(xiàn):1)布置更有利于吊桿的協(xié)同受力,能良好的改善吊桿疲勞性能,即使在某根吊桿斷裂的情況下也不會(huì)導(dǎo)致整橋的垮塌;2)桿間距的對(duì)吊桿疲勞性能的對(duì)比則要根據(jù)實(shí)際橋梁跨徑確定,一般控制在4~10米。過大的吊桿間距對(duì)吊桿抗疲勞設(shè)計(jì)不利;3)工程造價(jià),適當(dāng)增大吊桿截面積對(duì)吊桿抗疲勞設(shè)計(jì)有利,尤其是邊吊桿;4)剛度比過大對(duì)吊桿受力極為不利,不利于抗疲勞設(shè)計(jì);5)比對(duì)吊桿的抗疲勞設(shè)計(jì)影響甚微,可根據(jù)實(shí)際情況做最佳調(diào)整;6)邊吊桿離拱腳距離只對(duì)邊吊桿的抗疲勞性能有利,而對(duì)其他吊桿的疲勞性能改善作用微小。
[Abstract]:As China enters the 21st century, the infrastructure construction of our country has increased by leaps and bounds under the impetus of reform and opening up. With the increasing traffic pressure, the bridges on the highway in our country are operating at full load, and the service time is generally longer than 27 years. It can be imagined that the fatigue damage caused by the vehicle has become the biggest safety hazard of the bridge. Concrete-filled steel tubular arch bridge is favored by bridge builders for its light weight, large span capacity and beautiful mechanical lines. As the main force transfer component of the bridge structure, the health of arch bridge suspenders is related to the operation safety of the whole bridge. Therefore, in this paper, a through concrete filled steel tube arch bridge in Yunnan Province of Beijing-Kunming 108 National Highway is used as a prototype, and the fatigue performance of typical suspenders of the arch bridge under vehicle load is simulated and analyzed by using the universal finite element software Midas / CIVIL. By changing the design parameters of the arch bridge, the paper puts forward some suggestions for improving the fatigue design of the suspenders of the arch bridge. The main research contents and conclusions are as follows: 1. MATLAB software is used to simulate the load spectrum of a random vehicle with logarithmic normal distribution, and the load spectrum is applied randomly on the bridge deck lane. Based on the fatigue S-N curve analysis theory of 1860 grade steel strand, the equivalent stress amplitude and the equivalent stress cycle number of each typical suspender under the fatigue load spectrum are calculated by the rain flow counting method. Based on the Miner linear damage accumulation theory, the fatigue life of the suspension rod of the through arch bridge is evaluated. By changing some fatigue design parameters of arch bridge, the fatigue performance of suspension rod is compared in 6 cases. It is found that the arrangement of the lifting rod is more favorable to the cooperative force of the suspender and can improve the fatigue performance of the suspender. Even if a suspender is broken, it will not lead to the collapse of the whole bridge. The comparison of the fatigue performance of the suspension rod should be determined according to the actual span of the bridge, and generally controlled at 4m. The excessive distance between the suspenders is disadvantageous to the anti-fatigue design of the suspenders (3) the proper increase of the cross section area of the suspenders is beneficial to the anti-fatigue design of the suspenders, especially the excessive stiffness ratio of the side suspenders is extremely disadvantageous to the stress of the suspenders. It has little effect on the anti-fatigue design of the suspenders, and can be adjusted best according to the actual situation. The distance from the arch foot of the suspenders is only favorable to the anti-fatigue performance of the side suspenders, but the fatigue property of the other suspenders can be improved slightly.
【學(xué)位授予單位】：重慶交通大學(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

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本文編號(hào)：1776544