Parameter effects on the dynamic characteristics of a super-long-span triple-tower suspension bridge

Wang, Hao; Zou, Keguan; Li, Aiqun; Jiao, Changke

doi:10.1631/jzus.a0900496

Cited by 23 publications

(8 citation statements)

References 18 publications

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“…The vibration modes are clearly the same at different heights, although some modes are not significant or are not excited at heights of 13.915 m and 159.46 m. The first, second, third, and fourth obvious peaks are determined to be 0.07813, 0.1172, 0.166, and 0.2197 Hz, respectively. These modes are identified as the first lateral mode, second vertical mode, fifth vertical mode, and third lateral mode, respectively, as reported in [19,20]. The relative errors between the measured natural frequencies and the calculated frequencies (0.07742, 0.11776, 0.16898, and 0.22168 Hz, resp.)…”

Section: Frequency Response Of the Middle Towermentioning

confidence: 65%

Structural Condition Assessment of the Herringbone Middle Pylon of the Taizhou Bridge Using SHM Strain Data

Ding

Shen

2017

Journal of Sensors

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Taizhou Bridge is the world’s first kilometer-scale three-pylon suspension bridge. To minimize the impacts on navigation, a longitudinal herringbone steel pylon was adopted in the middle of the bridge without additional piers. This structure is unique, and little research has focused on its structural condition assessment. In this paper, eighty fiber Bragg grating strain sensors were deployed along the height of the steel tower to collect strain data about the key components and to monitor the pylon’s structural condition. Because temperature-induced strain contributes little to the stress in the pylon, the empirical mode decomposition method was proposed to remove the noise and the temperature-induced strain, leaving the dynamic strain response. The frequency characteristics were obtained from both the dynamic strain and the raw strain, and they show good agreement. A statistical analysis was adopted assuming that the extracted dynamic stress peaks and valleys were normally distributed. The expected maximum values from the statistical analysis were compared with the measured maximum values at different heights, and they agree well with each other. The maximum compression and tension of the key segments of the middle tower exhibited considerable redundancy, which indicates that the middle pylon is in good condition.

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Section: Frequency Response Of the Middle Towermentioning

confidence: 65%

Structural Condition Assessment of the Herringbone Middle Pylon of the Taizhou Bridge Using SHM Strain Data

Ding

Shen

2017

Journal of Sensors

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“…Yoshida et al (2004) derived an equation for the main cable stiffness of a four-span suspension bridge and analyzed its behavior, considering various parameters such as torsional behavior, deflection, and eigenvalue analysis for dead load, live load, and wind load. Parametric studies conducted by Zhang et al (2013) and Wang et al (2010) show that the elastic link between the middle pylon, cross beam, and stiffening girder has a significant role on the vertical modes of the bridge. The cable spring effect (i.e., longitudinal flexibility of the main cable) in MSB causes the weaker rigidity of the bridge girder and causes large vertical deflection.…”

Section: Introductionmentioning

confidence: 99%

Seismic Response of Multi-span Suspension Bridge under Multi-Support Excitation

Chauhan,

Chandrasekaran,

Datta

et al. 2024

Preprint

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The multi-span suspension bridge, a novel bridge system, has emerged as an economically viable alternative for sea-crossing bridges with extensive spans. However, as bridge length increases, the complex correlation between support excitation becomes apparent due to the coherency effect in the underlying soil and the seismic wave-passage effect, termed Multi-Support Excitation (MSE). This study focuses on the seismic responses of Multi-span Suspension Bridge (MSB) under MSE, taking into account incoherence and wave-passage effects. The study conducts a time history analysis of “Cheon-Sa Bridge” to investigate the responses of girder and pylons under three different types of homogenous soil conditions: soft, medium, and firm, with three different apparent wave velocities of 600 m/s, 900 m/s, and 1200 m/s. The responses obtained for different MSE cases are compared with a uniform seismic excitation of recorded earthquake ground motion of El-Centro 1940, Imperial Valley: 180 deg. Results show that MSE significantly affects the longitudinal and vertical responses of MSB. The girder exhibits 3.3 times higher deflections under soft and medium soil MSE cases. The MSE cases significantly increase the girder axial force by about 6 times that of the uniform excitation case. The side pylons exhibit a 30% – 38% increase in transverse responses and approximately 10–12 times higher longitudinal responses. It is concluded that the local site conditions and corresponding acceleration spectral density of bedrock motion significantly influence the response of MSB. Merely considering the wave-passage effect may underestimate the actual response.

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“…Changing some structural parameters of the bridge may enhance its dynamic characteristics [15,16]. e dynamic characteristics of a long-span bridge will change with the change of stiffness of each component and the change of constraint between the pylon and girder [17,18]. e change of boundary conditions also results in the change of dynamic characteristics of the bridge [19].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of a Double‐Pylon Cable‐Stayed Bridge with Steel Truss Girder and Single‐Cable Plane

Zeng

et al. 2021

Advances in Civil Engineering

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The dynamic characteristics are closely linked to the seismic stability and wind-resistant of the bridge. But different bridge types have different dynamic characteristics. In order to study the dynamic characteristics of a double-pylon cable-stayed bridge with a single-cable plane and steel truss girder whose main span is the longest in the world, the dynamic load test was done, and the finite element and the subspace iteration methods were used to analyze the vibration mode of the bridge. The influence of different structural parameters on the dynamic characteristics of the bridge was analyzed. The changed structural parameters are cable layout, stiffness of steel truss girder, stiffness of stayed cables, stiffness of pylons, the concentration of dead load, number and location of auxiliary piers, and structural system. The results show that the bending and torsion resistance of the double-pylon cable-stayed bridge with a single-cable plane and steel truss girder is weak. The torsional stiffness of the cable-stayed bridge with a double-cable plane is stronger than that of the cable-stayed bridge with a single-cable plane. The seismic stability and wind-resistant of the bridge can be improved by using light dead load, improving the stiffness of pylon and girder, and adding auxiliary piers scientifically. However, the change of cable stiffness has a complex influence on the dynamic characteristics of the bridge. The conclusion can offer references for the construction, maintenance, and design of the same type of bridges.

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Parameter effects on the dynamic characteristics of a super-long-span triple-tower suspension bridge

Cited by 23 publications

References 18 publications

Structural Condition Assessment of the Herringbone Middle Pylon of the Taizhou Bridge Using SHM Strain Data

Structural Condition Assessment of the Herringbone Middle Pylon of the Taizhou Bridge Using SHM Strain Data

Seismic Response of Multi-span Suspension Bridge under Multi-Support Excitation

Dynamic Characteristics of a Double‐Pylon Cable‐Stayed Bridge with Steel Truss Girder and Single‐Cable Plane

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