Abstract
The dynamic behavior of a large self-anchored suspension bridge was studied in this paper. A dynamic spatial finite element model of Taohuayu Yellow River Bridge, which is a super large span self-anchored suspension bridge, was created using MIDAS. Sub space iteration method was used to calculate its natural frequency and vibration mode, the dynamic characteristics and structure stiffness were discussed and analyzed on the basis of calculated results. Results show that the vibration modes are mainly vertical bending of deck, the stiffness of girder is small, in the first 10 vibration modes, out of plane sway and torsion of cable did not appeared, thus indicated this bridge was designed properly, and has a high performance in terms of anti-seismic. The results of this paper can also provide some references for the design, construction, health monitoring and maintenance of bridges of like.
Highlights
Self-anchored suspension bridge is different from earth anchored suspension bridge for that self-anchored suspension bridge is anchored on its girder instead of earth anchorage
Taohuayu Yellow River Bridge has the largest span among self-anchored suspension bridge, so no data of self-anchored suspension bridge with the same span can be referred, to ensure its safety in service stage, study on the natural frequency and vibration mode was performed using spatial FEM model established through MIDAS.This paper presents the calculation method and results that laid the foundation for the anti-seismic analysis, wind resistance design and vehicle-bridge vibration analysis of Taohuayu Yellow River Bridge, and provides some references for the design, construction and post operation management of bridges of like
Taohuayu Yellow River Bridge is large self-anchored suspension bridge, subspace iteration method is used to calculate its vibration modes, besides, first 10 orders of vibration modes and natural frequencies are selected as controlling parameters of dynamic calculation
Summary
Self-anchored suspension bridge is different from earth anchored suspension bridge for that self-anchored suspension bridge is anchored on its girder instead of earth anchorage. Anti-seismic capacity, wind resistance capacity and vehicle-bridge vibration problems are usually the main controlling factors when designing suspension bridge. The advantage of self-anchored suspension bridge is that the horizontal component of main cable significantly increased the stiffness of stiffening girder, so the dynamic characteristics of self-anchored suspension bridge is different from that of conventional earth anchored suspension bridge. Taohuayu Yellow River Bridge has the largest span among self-anchored suspension bridge, so no data of self-anchored suspension bridge with the same span can be referred, to ensure its safety in service stage, study on the natural frequency and vibration mode was performed using spatial FEM model established through MIDAS.This paper presents the calculation method and results that laid the foundation for the anti-seismic analysis, wind resistance design and vehicle-bridge vibration analysis of Taohuayu Yellow River Bridge, and provides some references for the design, construction and post operation management of bridges of like
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