斜拉桥结构采用碳纤维斜拉索与传统钢斜拉索的对比分析
发布时间：2018-07-18 11:09
【摘要】：斜拉桥因其造型雅观、跨越能力大、构造受力合理等特点而被广泛应用。随着斜拉桥向大跨径和特大跨径发展，传统斜拉索的腐蚀和振动疲劳问题更加突出，碳纤维复合材料成为解决这一问题的有效途径，将碳纤维材料用作斜拉索，可以克服传统钢斜拉索自重大，易腐蚀等缺点，发挥其轻质高强的优势，提高桥梁的跨越能力和承载效率。本文对CFRP材料进行了基础性研究，并选取了四种不同结构体系和跨径的斜拉桥，研究其分别采用传统钢斜拉索与CFRP索的结构动力和静力特性，得到直观的性能对比，为实际应用提供参考。为此本文主要做了以下方面的工作： 首先详细介绍了CFRP材料的特性，，对制约CFRP索应用的重要因素—锚具问题进行了研究，并在材料特性、极限跨径和垂度效应方面，对CFRP索和传统钢索进行了性能对比分析。研究得出，CFRP索材料性能明显优于传统钢索，并且极限跨径大，垂度效应小，等效弹性模量大，自重应力占总应力的比重小，对于大跨径结构优势明显。 然后采用有限元软件MIDAS分析比较了四种不同结构体系和跨径的斜拉桥采用CFRP索和传统钢索的静力性能，研究得出：采用CFRP索斜拉桥索力、主梁轴力、竖向位移较原斜拉桥都都有所减小，受力更均匀合理，在大跨径结构中优势较为突出。 最后采用有限元软件分析比较了四种不同结构体系和跨径的斜拉桥分别采用CFRP索和传统钢索的动力性能，研究发现：采用CFRP斜拉索的斜拉桥横弯和扭转频率普遍高于采用传统钢索斜拉桥的相应频率，而竖弯频率普遍低于原斜拉桥，但可以预见，随跨度的增大，CFRP索斜拉桥竖弯频率将高于传统钢索斜拉桥，自振频率的提高可以降低斜拉桥因为低频激励荷载作用而引起振动的机率。
[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.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
本文编号：2131718
[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.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
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