本文選題：高墩大跨連續(xù)剛構(gòu)橋　切入點(diǎn)：抖振　出處：《長安大學(xué)》2016年碩士論文

【摘要】：隨著人們生活質(zhì)量的不斷提高,便捷的交通也成為人們?nèi)找骊P(guān)注的焦點(diǎn)。連續(xù)剛構(gòu)橋是一種較為常見的橋型,交通的發(fā)展使得連續(xù)剛構(gòu)橋梁也越來越趨于高墩大跨方向發(fā)展,整體剛度已不如從前,那么風(fēng)荷載引起的結(jié)構(gòu)問題便日益突出并成為橋梁工程界亟待解決的重點(diǎn)問題。自然風(fēng)中的脈動紊流分量會引起橋梁結(jié)構(gòu)物的風(fēng)致抖振,這種振動是在任意風(fēng)速下都會產(chǎn)生的限幅振動。這種風(fēng)致振動雖不會像顫振一樣引起毀滅性的破壞,但是會導(dǎo)致結(jié)構(gòu)的大變形,影響行車安全和駕駛?cè)说氖孢m性。由抖振力引起頻繁的應(yīng)力循環(huán)會產(chǎn)生結(jié)構(gòu)疲勞,縮短橋梁使用壽命。因此,本文以高墩大跨度連續(xù)剛構(gòu)橋?qū)崢驗(yàn)檠芯繉ο?利用ANSYS的APDL語言二次開發(fā)功能以及MATLAB程序語言進(jìn)行施工及成橋階段風(fēng)致抖振響應(yīng)研究,應(yīng)用Miner線性累積損傷準(zhǔn)則進(jìn)行了抖振力荷載作用下橋梁結(jié)構(gòu)危險(xiǎn)部位疲勞損傷的研究。主要內(nèi)容包括:1)基于諧波合成法對騎騾溝大橋所處地理位置的脈動風(fēng)風(fēng)場進(jìn)行模擬,對模擬風(fēng)速的功率譜與目標(biāo)譜進(jìn)行對比。2)基于大型有限元軟件建立騎騾溝大橋施工階段及成橋階段有限元模型,計(jì)算該橋動力特性。并對騎騾溝大橋施工階段及成橋階段靜力風(fēng)荷載作用下的風(fēng)致響應(yīng)進(jìn)行計(jì)算分析。3)運(yùn)用Matrix27單元使得自激力通過矩陣形式在有限元模型中實(shí)現(xiàn)參數(shù)化模擬。4)運(yùn)用ANSYS瞬態(tài)動力分析將脈動風(fēng)轉(zhuǎn)化為時(shí)域化的抖振力荷載。對僅考慮Davenport準(zhǔn)定常抖振力荷載的橋梁進(jìn)行時(shí)域分析,其次添加模型氣動自激力并計(jì)算考慮自激力的抖振響應(yīng),與未考慮自激力的工況做對比。5)計(jì)算北山大橋主梁關(guān)鍵點(diǎn)應(yīng)力譜,運(yùn)用雨流計(jì)數(shù)法對應(yīng)力時(shí)程進(jìn)行統(tǒng)計(jì)分析并得出應(yīng)力循環(huán)及應(yīng)力幅。根據(jù)關(guān)鍵點(diǎn)在采樣時(shí)距中的應(yīng)力循環(huán)和應(yīng)力幅運(yùn)用Miner線性累積損傷準(zhǔn)則計(jì)算采樣時(shí)距的疲勞累積損傷并根據(jù)疲勞累積損傷計(jì)算抖振力荷載作用下該橋危險(xiǎn)點(diǎn)的疲勞壽命。
[Abstract]:With the improvement of life quality, convenient transportation has increasingly become the focus of attention. The continuous rigid frame bridge is a common traffic bridge, with the development of the continuous rigid frame bridge is more and more high pier and large span direction, the overall stiffness is less than the former, so structural problems caused by wind load will become increasingly prominent bridge engineering and become the key problem needs to be solved. The wind-induced buffeting of pulsating turbulent components of natural wind will cause the bridge structure, the vibration is limiting vibration at any speed will produce. This is not like the wind-induced vibration flutter caused devastating damage, but will lead to large deformation of the structure and the impact on traffic safety and driving comfort. Frequent stress cycle will produce fatigue caused by buffeting force, shorten the service life of the bridge. Therefore, the high pier large span. Continuous rigid frame bridge bridge as the research object, the construction and study of wind-induced buffeting response of bridge using APDL language two development function of ANSYS and MATLAB programming language, studied the fatigue damage of bridge structure risk effect of buffeting force load using Miner linear cumulative damage criteria. The main contents include: 1) simulation fluctuating wind field harmonic synthesis location of riding a mule ditch bridge based on power spectrum and the target spectrum to simulate the wind speed compared to.2) the establishment of riding a mule ditch bridge construction stage based on finite element software and bridge finite element model, calculating the dynamic characteristics of the bridge. And the wind on a mule construction stage ditch bridge and the bridge phase static wind load response were calculated and analyzed by Matrix27.3) unit makes the self-excited force through the matrix form in a finite element model to realize parametric modeling. 4) using ANSYS transient dynamic analysis will be transformed into fluctuating wind buffeting loads. The time domain of the time domain analysis considering only Davenport quasi steady bridge buffeting force load, and then add the buffeting model self-excited aerodynamic forces were calculated considering self-excited force response, do not consider the comparison between the.5 and the self-excited force condition) Beishan bridge calculation key point stress spectrum, the rain flow counting method of stress time history analysis and the cyclic stress and stress amplitude. According to the key points of cyclic stress and stress amplitude by Miner linear cumulative damage criterion calculation of the sampling interval the cumulative fatigue damage and fatigue life according to the damage calculation of buffeting vibration loads of the bridge fatigue cumulative danger point in sampling distance.

【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U441

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