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Study on Wind Stability of Cable-Stayed Suspension Bridge under Construction

Author: PanHangBin
Tutor: ZhangXinJun
School: Zhejiang University of Technology
Course: Bridge and Tunnel Engineering
Keywords: The hanging pull combination system bridge Construction phase Main beam erection order Dynamic characteristics Aerostatic stability Flutter Stability
CLC: U441
Type: Master's thesis
Year: 2010
Downloads: 13
Quote: 0
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Abstract


Hanging pull combination system bridge is a combination of the new cable-stayed bridge and suspension bridge, fully drawing on the advantages of cable-stayed and suspension bridges, and abandoned both the inadequacies, has a nice shape, structure and properties, investment Province , etc., with great prospects for development. Bridge span increases, the role of the structure of the wind will be more sensitive, especially during the construction period, the bridge has not yet formed a final structural system, structural stiffness and lower wind stability of the structure of the problem is more prominent. In this paper, a hanging pull combination system bridge design, through numerical simulation, analysis of the impact of the the hanging pull combination system bridge wind stability of different main beam erection sequence, main girder erection method with good wind stability, The future hanging pull Combined Bridge construction has a good reference value and engineering significance. First, the use of M [the DAs software and self programming to determine the structure of the ideal state into the bridge and the construction phase and create a finite element model of the construction phase; Secondly, the analysis procedures based on the dynamic characteristics of the structure of the subspace iteration method The the sDcA analysis of the force characteristics of the construction of the structure of the whole process of the combination system bridge crane to pull the bridge state and two main beams erected; again, using the structure of three-dimensional nonlinear aerostatic analysis program BsNAA two main beam erection the aerostatic stability program under the structure of the whole construction process evolution, reveal a different main beam erection sequence aerostatic stability; Finally, the use of the bridge structure three-dimensional flutter analysis program BsFA, and two main beam erection the structure of the whole construction process flutter stability, reveal the impact of the different main beam erection sequence of structural flutter stability. The results show that: (1) the main girder the larger span symmetrically assembled construction sequence from both sides of the bridge towers, the structure can be obtained from the vibration frequency, and static and dynamic stability of better air; ( 2) the main beam simultaneously from both sides of the bridge towers and cross across in the beginning of the last a closed symmetric cable-stayed segment with suspended segment junction assembly construction sequence is relatively stable, the dynamic characteristics of the construction process and the changes in aerostatic stability flutter stability of the structure gradually increase. Overall, the main beam from both sides of the bridge tower is more favorable to the construction sequence of the span in symmetrical Erection.

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CLC: > Transportation > Road transport > Bridges and Culverts > Structural principles, structural mechanics
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