Impact coefficient and reliability of mid-span continuous beam bridge under action of extra heavy vehicle with low speed

Abstract

To analyze the dynamic response and reliability of a continuous beam bridge under the action of an extra heavy vehicle, a vehicle-bridge coupled vibration model was established based on the virtual work principle and vehicle-bridge displacement compatibility equation, which can accurately simulate the dynamic characteristics of the vehicle and bridge. Results show that deck roughness has an important function in the effect of the vehicle on the bridge. When an extra heavy vehicle passes through the continuous beam bridge at a low speed of 5 km/h, the impact coefficient reaches a high value, which should not be disregarded in bridge safety assessments. Considering that no specific law exists between the impact coefficient and vehicle speed, vehicle speed should not be unduly limited and deck roughness repairing should be paid considerable attention. Deck roughness has a significant influence on the reliability index, which decreases as deck roughness increases. For the continuous beam bridge in this work, the reliability index of each control section is greater than the minimum reliability index. No reinforcement measures are required for over-sized transport.

Keywords

continuous beam bridge / extra heavy vehicle / coupled vibration / impact coefficient / reliability

References

[1] XingW-bang. Rapid assessment method research on bridge during oversize transport [J]. Journal of China & Foreign Highway, 2011, 31(3): 217-220

[2] LiuY, YeG-r, ZhangZ-cheng. Method “bridge on the bridge” used in the massive product transportation [J]. Journal of Wuhan University of Technology: Transportation Science & Engineering, 2008, 32(1): 176-179

[3] QianH, MengY, ZhangH-li. A special application of temporary steel bridge in heavy-cargo transportation [J]. Journal of Chongqing Jiaotong University, 2005, 24(5): 10-13

[4] ShiY, SongY-f, SunHui. Dynamic analysis method of vehicle-bridge coupling for complicated bridges based on ANSYS [J]. Journal of Tianjin University, 2010, 43(6): 537-543

[5] LiX-z, ZhangL-m, ZhangJie. State-of-the-art review and trend of studies on coupling vibration for vehicle and highway bridge system [J]. Engineering Mechanics, 2008, 25(3): 230-240

[6] ZengQ-yuan. The principle of total potential energy with stationary value in elastic system dynamics [J]. Journal of Huazhong University of Science and Technology, 2000, 28(1): 1-3

[7] GuoW-h, ChenD-h, LiZheng. Influence of secondary dead load on vehicle-bridge coupling vibration of long-span cable-stayed bridges [J]. Journal of Central South University: Science and Technology., 2011, 42(8): 2423-2429

[8] GB7031—1986 Vehicle vibration-describing method for road surface irregularity [S]. (in Chinese)

[9] Feisi ScienceTechnology Research Center.MATLAB7 aided signal processing technology and application [M], 2005, Bejing, Electronics Industry Press

[10] ZouK, YuanJ-q, GongX-yiMATLAB6.X signal processing [M], 2002, Beijing, Tsinghua University Press

[11] YangS-z, WuY, XuanJ-pingTime series analysis in engineering application [M], 2007, Wuhan, Huazhong University of Science and Technology Press

[12] HuG-shuDigital signal processing: Theory, algorithm and realization [M], 1996, Beijing, Tsinghua University Press

[13] ZhongY, ZhouF-l, ZhangY-shan. Dynamic response to a plate on elastic foundation under moving load with varying velocity [J]. Journal of Vibration and Shock, 2008, 27(1): 61-64

[14] HanW-s, MaL, YuanS-j, ZhaoS-min. Analysis of the effect of inconsistent stimulus of surface roughness on vehicle-bridge coupling vibrations [J]. China Civil Engineering Journal, 2011, 44(10): 81-90

[15] ZhouX-p, SongY-f, HeS-hai. Numerical analysis for coupled vibration of vehicle-bridgeon highway curved bridge [J]. Journal of Chang’an University: Natural Science Edition, 2009, 29(6): 41-46

[16] JTG/T J21—2011. Specifications for inspection and evaluation of the bearing ability of highway bridges [S]. (in Chinese)

[17] JTG D60—2004.General code for design of highway bridges and culverts, 2004, Beijing, The People’s Communications Publishing House

[18] TanG-j, LiuH-b, ChengY-chun. Analysis of impact of vehicle to simply supported beam [J]. Journal of Jilin University: Engineering and Technology Edition, 2011, 41(1): 62-67

[19] GuiJ-s, KangH-gui. The structural reliability calculation base on Matlab [J]. Sichuan Building Science, 2004, 30(2): 18-20

[20] LiZ-h, HangG-h, KangH-gui. Research for reliability of engineering structures based on Matlab’s optimization tool box [J]. Sichuan Building Science, 2005, 31(3): 1-4

[21] YanL, LuY-z, HeS-hai. Reliability of existing concrete bridge [J]. Journal of Chang’an University: Natural Science Edition, 2009, 29(1): 50-53

[22] GB/T 50283-1999. Unified standard for reliability design of highway engineering structures [S]. (in Chinese)