本文選題：模擬分析 + 橋墩偏位　； 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：重慶地處山嶺重丘區(qū),山高谷深,高墩坡橋相對(duì)較多。由于各種原因?qū)е逻@些橋梁出現(xiàn)墩柱偏移、梁體偏移或滑移等支座相關(guān)病害,最嚴(yán)重的情況下梁體幾乎掉在蓋梁上,嚴(yán)重威脅橋梁運(yùn)營安全。因此,對(duì)坡橋橋墩偏位原因分析研究變得尤為重要。本文基于有限元軟件MIDAS/Civil與ABAQUS對(duì)橋墩偏位進(jìn)行建模分析計(jì)算,主要工作如下:①結(jié)合李家灣大橋工程實(shí)例,使用MIDAS/Civil軟件的有限元平臺(tái),建立李家灣大橋模型,分析比較了正常支座與支座安裝傾斜在施加常規(guī)橋梁荷載分析橋墩偏位的結(jié)果,以及支座傾斜時(shí)橋墩墩頂受力分析,初步確定李家灣大橋大偏位的產(chǎn)生原因?yàn)橹ё惭b傾斜。另外,研究分析了支座安裝缺陷、支座剪切破壞演變過程以及支座脫空對(duì)橋梁受力的影響分析。得出了支座安裝缺陷對(duì)橋墩影響比較大,對(duì)主梁的影響比較小;支座破壞的演變過程讓橋墩偏位處于惡性循環(huán)的狀態(tài);支座脫空方式的不同對(duì)主梁的影響不同,可選擇性處理。②利用有限元軟件ABAQUS建立雙柱墩有限元模型,分析比較了雙柱墩不同墩高、不同墩徑、不同墩截面以及不同橋梁縱坡坡度的橋墩偏位與應(yīng)力結(jié)果。研究表明:隨著墩高的不斷變化,在墩高增大時(shí)偏位值與應(yīng)力值都在不斷升高。隨著墩徑的不斷變化,在墩徑增大時(shí)偏位值與應(yīng)力值都在不斷降低。在試圖減少墩徑的尺寸時(shí),橋墩偏位、最大應(yīng)力計(jì)算值會(huì)越來越大,并且增大趨勢在墩徑減少越來越快。圓形截面的橋墩計(jì)算得到的墩頂位移以及墩底應(yīng)力是最安全合力的。③結(jié)合全文研究的基礎(chǔ)下試圖優(yōu)化支座,增加支座最大允許位移,并且細(xì)化設(shè)計(jì)支座局部鋼件幾何尺寸。另外,提出了支座的安裝方法以及安裝注意事項(xiàng)。同時(shí),結(jié)合研究結(jié)果提出相關(guān)橋梁設(shè)計(jì)建議。
[Abstract]:Chongqing is located in the mountainous and heavy-hilly area, the mountains are high and the valley is deep, and there are relatively many bridges with high piers and slopes. As a result of various reasons these bridges appear pier column offset beam body offset or slippage and other supporting related diseases. In the most serious case the beam body almost falls on the cover beam which seriously threatens the safety of bridge operation. Therefore, it is very important to analyze and study the reason of bridge pier deviation. In this paper, based on the finite element software MIDAS/Civil and ABAQUS, the bridge pier deflection is modeled and calculated. The main work is as follows: 1. Combining with the Lijiawan Bridge engineering example, using the finite element platform of MIDAS/Civil software, the model of Lijiawan Bridge is established. This paper analyzes and compares the results of normal bearing and bearing installation tilt on the application of conventional bridge load to the analysis of pier deflection, as well as the force analysis on the top of pier when the support tilts. It is preliminarily determined that the cause of the great deviation of Lijiawan Bridge is the bearing installation inclination. In addition, the defects of bearing installation, the evolution process of support shear failure and the influence of support detachment on bridge force are analyzed. It is concluded that the defect of bearing installation has a great influence on the bridge piers and has little effect on the main beam; the evolution process of the bearing failure causes the pier to deviate in a vicious circle; the different ways of the support emptying have different effects on the main beam. Optional treatment .2 the finite element model of double-column pier is established by using finite element software ABAQUS, and the results of pier deflection and stress are analyzed and compared with different piers with different height, different piers diameter, different piers section and different slope of bridge longitudinal slope. The results show that with the increasing of pier height, both the deflection value and the stress value are increasing. With the continuous change of pier diameter, the deviation value and stress value are decreasing as the pier diameter increases. When trying to reduce the size of pier diameter, the maximum stress value will become larger and larger, and the increasing trend will decrease more and more quickly. The displacement of the pier top and the stress at the bottom of the pier obtained from the calculation of the pier with circular section are the safest resultant force. 3. Based on the research of the full text, this paper attempts to optimize the support, increase the maximum allowable displacement of the support, and refine the geometric dimensions of the local steel parts of the design support. In addition, the installation method of the bearing and the matters needing attention are put forward. At the same time, based on the results of the study, some suggestions on bridge design are put forward.
【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;U443.22

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本文編號(hào)：1824306