Road Dynamic Responses Under Moving Vehicle Loads Based on Double-Layer Plate Model

2015 ◽  
pp. 161-193
Author(s):  
Shaopu Yang ◽  
Liqun Chen ◽  
Shaohua Li
Keyword(s):  
Double Layer ◽  
Dynamic Responses ◽  
Plate Model ◽  
Moving Vehicle ◽  
Vehicle Loads

Analysis of Horizontal Reactions Due to Moving Vehicle Loads in Curved Bridges with Varied Support Conditions

2005 ◽  
Vol 8 (5) ◽  
pp. 529-545 ◽  
Author(s):  
Sang-Hyo Kim ◽  
Yong-Seon Lee ◽  
Kwang-Yil Cho
Keyword(s):  
Support Systems ◽  
Tangential Direction ◽  
Dynamic Responses ◽  
Radius Of Curvature ◽  
Moving Vehicle ◽  
Curved Bridge ◽  
Load Distributions ◽  
Moving Vehicles ◽  
Vehicle Loads ◽  
Support Conditions

A curved bridge can have two different bearing directions: chordal and tangential direction. This may bring differences of load distribution due to moving vehicles and structural behavior of a curved bridge. This study presents a 3D numerical model that can demonstrate the dynamic responses of a curved bridge to moving vehicles more precisely. The dynamic response induced by the centrifugal rolling motion of a vehicle is identified according to the variations of the superelevation and the radius of curvature of the deck. Dynamic characteristics of the curved bridge with the moving vehicle are analyzed under the condition of the support types and two different support systems. In general, while the vehicle is passing over the curved bridge, the negative reaction occurs in the inside of the girder. The final result shows that the support system located outside the girder is more advantageous than other systems, and the characteristics of load distributions differ from the others in the various conditions of support systems.

Dynamic Responses of a Simply Supported Bridge to Moving Vehicle Loads

2011 ◽  
Vol 117-119 ◽  
pp. 231-235 ◽  
Author(s):  
Jeng Hsiang Lin
Keyword(s):  
Time Domain ◽  
Analytical Approach ◽  
Dynamic Responses ◽  
Integral Approach ◽  
Convolution Integral ◽  
Moving Vehicle ◽  
Simply Supported ◽  
Vehicle Loads ◽  
Axle Loads ◽  
Good Agreement

The estimation of dynamic responses of a bridge under vehicle loads moving along the bridge is frequently a problem of great interest for bridge engineers. Presented herein is an analytical approach to estimate the dynamic responses of a simply supported Euler-Bernoulli bridge under a set of vehicle axle loads moving along the bridge at constant speed. The approach involves convolution of the vehicle axle loads with modal responses of the bridge. The convolution integral is solved in time domain by a numerical integral approach. The solution was verified and good agreement was found.

A Method of Reinforcement and Vibration Reduction of Girder Bridges Using Shape Memory Alloy Cables

2017 ◽  
Vol 17 (07) ◽  
pp. 1750076 ◽  
Author(s):  
Ai-Rong Liu ◽  
Chun-Hui Liu ◽  
Ji-Yang Fu ◽  
Yong-Lin Pi ◽  
Yong-Hui Huang ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Traffic Safety ◽  
Torsional Rigidity ◽  
Vibration Reduction ◽  
Torsional Vibrations ◽  
Moving Vehicle ◽  
Girder Bridges ◽  
Fe Simulations ◽  
Vehicle Loads

Bending and torsional vibrations caused by moving vehicle loads are likely to affect the traffic safety and comfort for girder bridges with limited torsional rigidity. This paper studies the use of cables made of shape memory alloy (SMA) as the devices of reinforcement and vibration reduction for girder bridges. The SMA cables are featured by their small volume, expedient installation. To investigate their effect on the vibration of girder bridges, theoretical analysis, numerical simulation and experimental study were conducted in this paper. For bending vibration, the governing equations of the girder with and without SMA cables subjected to moving vehicle loads were derived, while for torsional vibration, the finite element (FE) simulations were used instead. The results of bending and torsional vibrations obtained by the analytical approach and FE simulations, respectively, were compared with the experimental ones from model testing. It was confirmed that the SMA cables can restrain the vibration of the girder bridge effectively.

Dynamic Properties of Coupled Train-Bridge Interaction System

2014 ◽  
Vol 1065-1069 ◽  
pp. 875-881
Author(s):  
Xue Tong Si ◽  
Ke Jian Chen ◽  
Wen Hua Guo
Keyword(s):  
Finite Element ◽  
Coupling Effect ◽  
Dynamic Properties ◽  
Coupled System ◽  
Dynamic Responses ◽  
Plate Model ◽  
Lateral Direction ◽  
Long Span ◽  
Interaction System ◽  
Spatial Beam

This paper investigates the dynamic properties of each sub-system of a coupled railway train-bridge interaction system. Both spatial beam-plate model and spatial grillage model are built for a long-span dual-deck cable-stayed railway bridge by use of finite element method. The railway train is modeled as a mass-spring-damper system. Then free vibration equations are established based on the finite element models and then subspace iteration method is employed to calculate the dynamic properties for each sub-system. Results show that the spatial grillage model agrees well with the spatial beam-plate model in terms of mass and stiffness distribution. The spatial beam-plate model serves as benchmark solution and the grillage model as a tool for dynamic responses of the coupled system due to its computational efficiency. It also shows that first modes of both the railway train and long-span bridge are lateral direction, which indicates that the train may experience much response in lateral direction. Therefore attention should be drawn to the lateral running stability and safety of railway train due to the coupling effect between the bridge and railway train.

Identifying Mode Shapes of Girder Bridges Using Dynamic Responses Extracted from a Moving Vehicle Under Impact Excitation

2017 ◽  
Vol 17 (08) ◽  
pp. 1750081 ◽  
Author(s):  
Z. Q. Qi ◽  
F. T. K. Au
Keyword(s):  
Surface Roughness ◽  
Natural Frequency ◽  
Road Surface ◽  
Measurement Noise ◽  
Dynamic Responses ◽  
Impact Excitation ◽  
Mode Shapes ◽  
Moving Vehicle ◽  
Girder Bridges ◽  
Road Surface Roughness

The mode shapes of a bridge are important modal properties for many purposes, such as damage detection and model updating. Traditional methods for constructing mode shapes often require installation of instruments on the bridge for collection of dynamic responses. However, these methods are not only costly but also inconvenient. Therefore, a method is developed for constructing the mode shapes of girder bridges using the dynamic responses extracted from a moving vehicle under impact excitation. This paper reports some numerical simulations based on finite element modeling. First, the dynamic responses of a moving vehicle under impact excitation are generated for simulation. Then the component response associated with each natural frequency of the bridge is extracted by using a suitable filter. Finally, the mode shape associated with each natural frequency identified is constructed from the extracted component response and its Hilbert transform pair. The proposed method uses only the information measured from the moving vehicle, which acts both as a sensor and an exciter. Moreover, the additional impact excitation on the vehicle helps to excite the bridge. This helps to improve the accuracy by overcoming the adverse effects of measurement noise and road surface roughness. The effects of measurement noise, road surface roughness and vehicle speed on the accuracy of results are evaluated. A numerical study is presented to verify the feasibility of the proposed method.

scholarly journals Moving Load Identification with Long Gauge Fiber Optic Strain Sensing

2021 ◽  
Vol 16 (3) ◽  
pp. 131-158
Author(s):  
Qingqing Zhang ◽  
Wenju Zhao ◽  
Jian Zhang
Keyword(s):  
Fiber Optic ◽  
Moving Load ◽  
Field Testing ◽  
Maximum Strain ◽  
Load Identification ◽  
Moving Vehicle ◽  
Moving Vehicles ◽  
Structural Responses ◽  
Vehicle Loads ◽  
Moving Load Identification

Moving load identification has been researched with regard to the analysis of structural responses, taking into consideration that the structural responses would be affected by the axle parameters, which in its turn would complicate obtaining the values of moving vehicle loads. In this research, a method that identifies the loads of moving vehicles using the modified maximum strain value considering the long-gauge fiber optic strain responses is proposed. The method is based on the assumption that the modified maximum strain value caused only by the axle loads may be easily used to identify the load of moving vehicles by eliminating the influence of these axle parameters from the peak value, which is not limited to a specific type of bridges and can be applied in conditions, where there are multiple moving vehicles on the bridge. Numerical simulations demonstrate that the gross vehicle weights (GVWs) and axle weights are estimated with high accuracy under complex vehicle loads. The effectiveness of the proposed method was verified through field testing of a continuous girder bridge. The identified axle weights and gross vehicle weights are comparable with the static measurements obtained by the static weighing.

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