本文選題：中承式鋼管混凝土拱橋 + 車橋耦合振動(dòng)�。� 參考：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：早期建造的中承式鋼管混凝土拱橋,很多的構(gòu)造型式都是由吊桿懸吊橫梁,然后在橫梁之間直接鋪設(shè)橋面板,而并沒(méi)有設(shè)置相應(yīng)的縱梁。這使得橋面系整體性較差,剛度偏低,橋梁整體的動(dòng)力性能較差,振動(dòng)幅度大,持續(xù)時(shí)間長(zhǎng),能量耗散慢,對(duì)于橋梁的使用性、耐久性和安全性都很不利。在這種情況下,實(shí)際運(yùn)營(yíng)中橋面發(fā)生了很多病害,如橋面松散、開(kāi)裂、破損甚至出現(xiàn)漏洞等嚴(yán)重問(wèn)題。然而橋梁已經(jīng)建成,再添加相應(yīng)的縱梁無(wú)論從設(shè)計(jì)還是施工等其它方面都很難實(shí)現(xiàn)。所以,就要全面地分析橋梁的性能,進(jìn)而從其它方面找到提高橋梁橋面系動(dòng)力性能的方法。本文從引起橋面損傷的其中一個(gè)原因——橋面板的疲勞性能方面來(lái)分析橋面系的性能,使用分離式車橋耦合振動(dòng)計(jì)算方法來(lái)研究結(jié)構(gòu)的動(dòng)力響應(yīng),并分析了多種因素對(duì)于橋面板疲勞性能的影響。首先,本文所使用的工程背景橋梁為坐落在遼寧省省會(huì)沈陽(yáng)市渾河上的長(zhǎng)青大橋,對(duì)橋梁中跨進(jìn)行有限元建模,選取了相應(yīng)的平面四自由度車輛模型以及橋面不平整度計(jì)算模型,結(jié)合自編程序?qū)蛄旱能嚇蝰詈险駝?dòng)進(jìn)行了細(xì)致的計(jì)算分析。分析了橋梁在車輛作用下的動(dòng)力響應(yīng),如動(dòng)位移、動(dòng)力沖擊系數(shù)以及動(dòng)彎矩等。通過(guò)分析,發(fā)現(xiàn)處于橫梁上的橋面板上緣處于異號(hào)的拉-壓應(yīng)力循環(huán)作用下,相比橫梁間板中心的只受壓應(yīng)力產(chǎn)生更大的橋面板疲勞損傷。又分析了行車速度與橋面不平整度對(duì)橋梁動(dòng)力性能的影響,發(fā)現(xiàn)不平整度越差,橋梁的動(dòng)力響應(yīng)越大;而行車速度的不同對(duì)于橋梁動(dòng)力響應(yīng)沒(méi)有明顯的變化規(guī)律。然后,著重從橋面板疲勞性能這一方面對(duì)橋梁橋面系進(jìn)行了研究。計(jì)算分析了橫梁寬度、橋面板厚度、橋面不平整度、行車速度等因素對(duì)于橋面板疲勞性能的影響。分析得知,橫梁寬度越大,橋面板疲勞壽命越高;橋面板厚度越大,橋面板疲勞壽命越高,且厚度達(dá)30cm后疲勞壽命增幅變緩;橋面不平整度越差,橋面疲勞性能越低,建議至少保持B級(jí)平整度以上水平;而行車速度對(duì)橋面板疲勞性能的影響沒(méi)有明顯規(guī)律。最后,給出了加固前長(zhǎng)青橋的靜、動(dòng)力檢測(cè)結(jié)果,以及添加鋼縱梁等加固措施以及效果評(píng)價(jià)。又詳細(xì)闡述了新近提出的剪刀式阻尼器加固方式以及其改進(jìn)后的方案,并分別分析了其加固效果,發(fā)現(xiàn)改進(jìn)后的剪刀式阻尼器比之前的加固效果又有了一定的提高。
[Abstract]:In the early construction of the middle bearing type concrete filled steel tube arch bridge, many structural types were suspended by suspended beams, and then the bridge deck was laid directly between the beams, and the corresponding longitudinal beams were not set. This made the deck system less integral, the stiffness was low, the overall dynamic energy of the bridge was poor, the amplitude of the vibration was large, the duration was long, and the energy dissipation was long. Slow, the use, durability and safety of the bridge are very bad. In this case, there are many diseases in the actual operation of the bridge, such as the loose bridge surface, cracking, breakage and even loopholes. However, the bridge has been built and the corresponding longitudinal beam is difficult to realize from other aspects, such as design and construction. It is necessary to analyze the performance of bridges in an all-round way, and then find ways to improve the dynamic performance of bridge deck system from other aspects. In this paper, the performance of bridge deck system is analyzed from the fatigue performance of bridge deck, which is one of the causes of bridge deck damage, and the dynamic response of the structure is studied by the coupled vibration calculation method of the separation type vehicle bridge. The influence of various factors on the fatigue performance of the bridge deck is analyzed. First, the bridge used in this paper is the Changqing bridge located on the Hun River in Shenyang, the capital of Liaoning province. The finite element modeling is carried out on the middle span of the bridge. The corresponding plane four degree of freedom vehicle model and the calculation model of the uneven deck of the bridge deck are selected. The coupled vibration of the bridge is carefully calculated and analyzed. The dynamic response of the bridge under the action of the vehicle, such as the dynamic displacement, the dynamic impact coefficient and the dynamic bending moment, is analyzed. Through the analysis, it is found that the upper edge of the bridge deck on the beam is under the action of the tensile compressive stress on the beam and the only compression of the center of the beam between the beams. Stress produces more fatigue damage of bridge deck. The effect of driving speed and uneven deck on bridge dynamic performance is analyzed. It is found that the worse the uneven degree is, the greater the dynamic response of bridge is, and the difference of driving speed is not obvious to the dynamic response of bridge. Then, the stress of bridge deck is mainly from the fatigue performance of bridge deck. The bridge deck system is studied. The influence of the width of the beam, the thickness of the bridge deck, the unevenness of the bridge deck and the speed of the bridge on the fatigue performance of the bridge deck is calculated and analyzed. The analysis shows that the greater the width of the beam, the higher the fatigue life of the bridge deck, the greater the thickness of the bridge deck, the higher the fatigue life of the bridge deck, and the increase of fatigue life after the thickness of 30cm. The slower the amplitude and the lower the deck roughness, the lower the fatigue performance of the bridge deck, it is suggested that at least the level of B level is maintained at least, and the driving speed has no obvious influence on the fatigue performance of the bridge deck. Finally, the static and dynamic testing results of the Changqing bridge before reinforcement and the reinforcement measures of the steel longitudinal beam and the effect evaluation are given in detail. The newly proposed reinforcement method of the scissors type damper and its improved scheme are described, and the reinforcement effect is analyzed respectively. It is found that the improved scissors damper has a certain improvement over the previous reinforcement effect.
【學(xué)位授予單位】：哈爾濱工業(yè)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;U448.22

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本文編號(hào)：1914157