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Influence of central buckle on suspension bridge dynamic characteristics and driving comfort

Journal of central South University 2015年第8期22卷 3108-3115页

作者：王达邓扬刘扬 School of Civil Engineering and Architecture Changsha University of Science & Technology

The central buckle, which is often used in a suspension bridge, can improve bridges' performance in the actual operation condition. The influence of the central buckle on natural vibration characteristics and bridge-deck driving comfort of a long-span suspension bridge is studied by using a case study of Siduhe Suspension Bridge in China. Based on the finite element software ANSYS and independently complied program, the influence of the central buckle on the structure force-applied characteristics of a long-span suspension bridge has been explored. The results show that the huge increases of natural frequencies can result in the presence of central buckles because of the increases of bending and torsional rigidities. The central buckle basically makes the stiffening girders and cables within the triangular area covered as a relatively approximate rigid area. Hence, the central buckle can reduce the torsional displacement of the main girder. However, the increases of bending and torsional rigidities have little influence on the impact factor, which is obtained by using vehicle-bridge coupled vibration analysis. This means that the central buckle has little effect on the comfort indices. In addition, it is found that the central buckle can enhance the bridge deck's driving stability due to the decrease of the torsional displacements of the main girder.

关键词： suspension bridge central buckle dynamic characteristic separation method impact factor

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Non-linear buffeting response analysis of long-span suspension bridges with central buckle

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Earthquake Engineering and Engineering Vibration 2010年第2期9卷 259-270页

作者： Wang Hao1,2,Li Aiqun1,Zhao Gengwen1 and Li Jian2 1.College of Civil Engineering,Southeast University,Nanjing 210096,China 2.Civil and Environmental Engineering,University of Illinois at Urbana-Champaign,Urbana,IL 61801,USA College of Civil Engineering Southeast University Nanjing China Civil and Environmental Engineering University of Illinois at Urbana-Champaign Urbana USA

The rigid central buckle employed in the Runyang Suspension Bridge (RSB) was the first time it was used in a suspension bridge in China. By using a spectral representation method and FFT technique combined with measured data,a 3D fluctuating wind field considering the tower wind effect is simulated. A novel FE model for buffeting analysis is then presented,in which a specific user-defined Matrix27 element in ANSYS is employed to simulate the aeroelastic forces and its stiffness or damping matrices are parameterized by wind velocity and vibration frequency. A nonlinear time history analysis is carried out to study the influence of the rigid central buckle on the wind-induced buffeting response of a long-span suspension bridge. The results can be used as a reference for wind resistance design of long-span suspension bridges with a rigid central buckle in the future.

关键词： suspension bridge buffeting response central buckle nonlinear time history analysis ANSYS

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Influence of rigid central buckle on seismic response of long-span suspension bridges

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High Technology Letters 2011年第2期17卷 214-219页

作者：王浩 Li Aiqun Jiao Changke Zou Keguan Key I.lboratory of Concrete ＆ Prestressed Concrete Structure of Education Ministry Southeast University Nanjing 210096 P. R. China

A rigid central buckle is employed in Runyang Suspension Bridge （RSB） to replace commonly used short suspenders in the main span. Based on the seismic waves with 2% probabilities of exceedance, the nonlinear seismic response time-domain analysis are then conducted and influence of central buckles on seismic response of long-span suspension bridge is specially studied. Analysis resuits show that the central buckle can effectively control the longitudinal floating vibration mode of the deck, and therefore reduce earthquake-excited longitudinal displacement at the end of the deck. However, the central buckle may cause increment of longitudinal displacement at the top of main tower and bending moment at the bottom of the main tower, which should be paid special attention to. Results provide references for anti-earthquake analysis and design of long-span suspension bridges using rigid central buckles.

关键词： suspension bridge central buckle seismic response time-history analysis ANSYS

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