預(yù)應(yīng)力混凝土桁架梁橋的動(dòng)力特性研究
[Abstract]:With the rapid development of economy, the construction of bridges in our country has been developed rapidly, and the forms of bridge structures are gradually diversified, large-scale and light. Prestressed concrete truss girder bridge can give full play to the characteristics of high strength materials, promote the lightweight of the structure, have good span ability, and can effectively avoid concrete cracking at the same time. In addition, it has the advantages of high stiffness, good durability, light weight, saving steel and cement, beautiful shape, etc. In addition, it has the advantages of clear structural force, simple structure, small expansion joint, etc. In the current bridge construction has been more and more popularized and used. Because of its light weight and other characteristics, it is easy to be affected by wind load, vehicle load, earthquake load and other dynamic loads, so the study of the dynamic characteristics of bridges is a common concern. The fundamental frequency of the bridge structure reflects the relationship between the bridge structure and the impact coefficient, so the accurate calculation of the fundamental frequency directly affects the magnitude of the impact coefficient. It is clearly stated in the code that the natural vibration frequency of the bridge should be calculated by finite element method. For some conventional structures, the code provides its fundamental frequency estimation formula, but the fundamental frequency calculation formula of prestressed concrete truss girder bridge is still lacking in domestic and foreign codes, so it is necessary to study the fundamental frequency calculation formula of prestressed concrete truss beam bridge. Aiming at the above problems, this paper mainly does the following work: (1) using the finite element software Midas / Civil, taking different span, width, chord stiffness and web stiffness of prestressed concrete truss girder bridge as design parameters, (2) the influence of each parameter on the fundamental frequency of the structure is studied, and the sensitive parameters are determined. (3) according to the law of the influence of the sensitive parameter on the fundamental frequency of the structure, Fitting the calculation formula of the fundamental frequency of prestressed concrete truss girder bridge. (4) measured the structural fundamental frequency of the two real bridges of Wujian Bridge and Yangshi Bridge, and the measured value is close to the calculated value of the formula in this paper. It shows that the calculation formula of foundation frequency of prestressed concrete truss girder bridge presented in this paper can be used as a reference for engineering design.
【學(xué)位授予單位】:揚(yáng)州大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:U441;U448.21
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