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Research Papers

Evaluation of Ride Comfort and Driving Safety for Moving Vehicles on Slender Coastal Bridges

[+] Author and Article Information
J. Zhu

Department of Civil and
Environmental Engineering,
University of Connecticut,
Storrs, CT 06269
e-mail: jin.zhu@uconn.edu

W. Zhang

Department of Civil and
Environmental Engineering,
University of Connecticut,
Storrs, CT 06269
e-mail: wzhang@engr.uconn.edu

M. X. Wu

Department of Civil Engineering
and Architecture,
Southwest Petroleum University,
Chengdu 610500, Sichuan, China
e-mail: mx_swpu@126.com

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received October 11, 2017; final manuscript received February 28, 2018; published online April 26, 2018. Assoc. Editor: Matthew Brake.

J. Vib. Acoust 140(5), 051012 (Apr 26, 2018) (15 pages) Paper No: VIB-17-1453; doi: 10.1115/1.4039569 History: Received October 11, 2017; Revised February 28, 2018

Evaluating driving safety of moving vehicles on slender coastal bridges as well as bridge safety is important to provide supporting data to make decisions on continuing or closing the operations of bridges under extreme weather conditions. However, such evaluations could be complicated due to the complex dynamic interactions of vehicle-bridge-wind-wave (VBWW) system. The present study proposes a comprehensive evaluation methodology on vehicle ride comfort and driving safety on the slender coastal bridges subject to vehicle, wind, and wave loads. After a brief introduction of the VBWW coupling dynamic system and obtaining the dynamic responses of the vehicles, the vehicle ride comfort is evaluated using the advanced procedures as recommended in the ISO 2631-1 standard based on the overall vibration total value (OVTV). The vehicle driving safety is analyzed based on two evaluation criteria, i.e., the roll safety criteria (RSC) and the sideslip safety criteria (SSC), through the vehicle contact force responses at the wheels. Finally, the proposed methodology is applied to a long-span cable-stayed bridge for the vehicle ride comfort and driving safety evaluation.

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Figures

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Fig. 1

Flowchart of the analytical framework of the VBWW system

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Fig. 2

Wave action on a single pile

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Fig. 3

Numerical model of a high-sided vehicle: (a) elevation view and (b) side view

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Fig. 4

Layout of the tower and the tower foundation (unit: m)

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Fig. 5

Eight vibration measures for a seated person

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Fig. 6

Frequency weighting curves for different participating axes

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Fig. 7

(a) Configuration of the prototype coastal slender cable-stayed bridge (unit: m) and (b) cross section of the bridge deck (unit: m)

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Fig. 8

Correlated wind and wave fields with different input wind speeds (z0=0.01 m, γ = 3.3, h = 32 m, F = 200 km): (a) wind turbulence u(t) and w(t) at the midpoint of the bridge deck and (b) wave surface elevation η(t), and water particle velocity ux(t) and acceleration u˙xt at the location of one pile

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Fig. 9

One-sided PSD of the vertical acceleration response of the vehicle: (a) PSD of the original response and (b) PSD of the frequency-weighted response

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Fig. 10

Comparison between the time segment of the original and frequency-weighted vertical acceleration response at seat location

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Fig. 11

The OVTVs for both the light truck and the sedan car at different wind speeds with and without the wave loads (V = 25 m/s; lane 1; good road condition)

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Fig. 12

The OVTVs for the light truck at different vehicle speeds (lane 1; good road condition)

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Fig. 13

The OVTVs for the light truck at different traffic lanes (V = 25 m/s; good road condition)

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Fig. 14

OVTVs with and without considering the traffic flow (V = 25 m/s; lane 1; good road condition)

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Fig. 15

Vehicle safety indicators with and without considering the wave loads (V = 25 m/s; lane 1; good road condition): (a) RSC and (b) SSC

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Fig. 16

Vehicle safety indicators with traffic speed (— light truck; - - sedan car; lane 1; good road condition): (a) RSC and (b) SSC

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Fig. 17

Vehicle safety indicators with traffic lane (— light truck; - - sedan car; V = 25 m/s; good road condition): (a) RSC and (b) SSC

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Fig. 18

Vehicle safety indicators with road roughness (— light truck; - - sedan car; V = 15 m/s; lane 3): (a) RSC and (b) SSC

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