【摘要】：斜拉橋因其造型雅觀、跨越能力大、構(gòu)造受力合理等特點(diǎn)而被廣泛應(yīng)用。隨著斜拉橋向大跨徑和特大跨徑發(fā)展，傳統(tǒng)斜拉索的腐蝕和振動(dòng)疲勞問(wèn)題更加突出，碳纖維復(fù)合材料成為解決這一問(wèn)題的有效途徑，將碳纖維材料用作斜拉索，可以克服傳統(tǒng)鋼斜拉索自重大，易腐蝕等缺點(diǎn)，發(fā)揮其輕質(zhì)高強(qiáng)的優(yōu)勢(shì)，提高橋梁的跨越能力和承載效率。本文對(duì)CFRP材料進(jìn)行了基礎(chǔ)性研究，并選取了四種不同結(jié)構(gòu)體系和跨徑的斜拉橋，研究其分別采用傳統(tǒng)鋼斜拉索與CFRP索的結(jié)構(gòu)動(dòng)力和靜力特性，得到直觀的性能對(duì)比，為實(shí)際應(yīng)用提供參考。為此本文主要做了以下方面的工作： 首先詳細(xì)介紹了CFRP材料的特性，，對(duì)制約CFRP索應(yīng)用的重要因素—錨具問(wèn)題進(jìn)行了研究，并在材料特性、極限跨徑和垂度效應(yīng)方面，對(duì)CFRP索和傳統(tǒng)鋼索進(jìn)行了性能對(duì)比分析。研究得出，CFRP索材料性能明顯優(yōu)于傳統(tǒng)鋼索，并且極限跨徑大，垂度效應(yīng)小，等效彈性模量大，自重應(yīng)力占總應(yīng)力的比重小，對(duì)于大跨徑結(jié)構(gòu)優(yōu)勢(shì)明顯。 然后采用有限元軟件MIDAS分析比較了四種不同結(jié)構(gòu)體系和跨徑的斜拉橋采用CFRP索和傳統(tǒng)鋼索的靜力性能，研究得出：采用CFRP索斜拉橋索力、主梁軸力、豎向位移較原斜拉橋都都有所減小，受力更均勻合理，在大跨徑結(jié)構(gòu)中優(yōu)勢(shì)較為突出。 最后采用有限元軟件分析比較了四種不同結(jié)構(gòu)體系和跨徑的斜拉橋分別采用CFRP索和傳統(tǒng)鋼索的動(dòng)力性能，研究發(fā)現(xiàn)：采用CFRP斜拉索的斜拉橋橫彎和扭轉(zhuǎn)頻率普遍高于采用傳統(tǒng)鋼索斜拉橋的相應(yīng)頻率，而豎彎頻率普遍低于原斜拉橋，但可以預(yù)見(jiàn)，隨跨度的增大，CFRP索斜拉橋豎彎頻率將高于傳統(tǒng)鋼索斜拉橋，自振頻率的提高可以降低斜拉橋因?yàn)榈皖l激勵(lì)荷載作用而引起振動(dòng)的機(jī)率。
[Abstract]:The cable-stayed bridge is widely used because of its elegant shape, large span ability and reasonable structure. With the development of cable-stayed bridge to long span and large span, the problems of corrosion and vibration fatigue of traditional stay cable become more prominent. Carbon fiber composite material becomes an effective way to solve this problem, and carbon fiber material is used as stay cable. It can overcome the shortcomings of the traditional steel stay cable such as self-important, easy to corrode, give play to its advantages of light weight and high strength, and improve the bridge's span capacity and bearing efficiency. In this paper, the basic research on CFRP material is carried out, and four kinds of cable-stayed bridges with different structures and spans are selected to study the structural dynamic and static characteristics of traditional steel cable and CFRP cable respectively. It provides reference for practical application. The main work of this paper is as follows: firstly, the characteristics of CFRP materials are introduced in detail, and the Anchorage problem, which is an important factor restricting the application of CFRP cables, is studied, and the material characteristics, ultimate span and sag effect are studied. The performance of CFRP cable and traditional steel cable are compared and analyzed. The results show that the properties of CFRP cable are better than that of traditional steel cable, and the material has the advantages of large ultimate span, small sag effect, large equivalent modulus of elasticity, small proportion of self-weight stress to total stress, and obvious advantage for long-span structure. Then the static behavior of four cable-stayed bridges with CFRP cables and traditional steel cables is analyzed and compared by using the finite element software Midas. The results show that the cable force and the axial force of the main beam are obtained by CFRP cable stayed bridge. The vertical displacement is smaller than that of the original cable-stayed bridges, the force is more uniform and reasonable, and the advantages in the long-span structures are more prominent. Finally, the dynamic performance of four kinds of cable-stayed bridges with CFRP cables and traditional cables are analyzed and compared by using finite element software. It is found that the transverse bending and torsional frequencies of the cable-stayed bridges with CFRP cables are generally higher than those of the traditional cable-stayed bridges, while the vertical bending frequencies are generally lower than those of the original cable-stayed bridges. With the increase of span, the vertical bending frequency of CFRP cable-stayed bridge will be higher than that of traditional cable-stayed bridge, and the increase of natural vibration frequency can reduce the probability of vibration of cable-stayed bridge caused by low-frequency excitation.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U448.27

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