Dynamic Response of a Vehicle-Bridge Expansion Joint Coupled System

Zhang, Lu; Wang, Shaohua; Li, Bing

doi:https://doi.org/10.1155/2022/1621589

Shock and Vibration

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Abstract Introduction Results and Analysis Conclusions Data Availability Conflicts of Interest Acknowledgments References Copyright Related Articles

Research Article | Open Access

Volume 2022 | Article ID 1621589 | https://doi.org/10.1155/2022/1621589

Dynamic Response of a Vehicle-Bridge Expansion Joint Coupled System

Lu Zhang,^1,2Shaohua Wang,^2,3and Bing Li⁴

Academic Editor: Junhong Park

Received17 Jun 2021

Revised07 Nov 2021

Accepted22 Dec 2021

Published11 Jan 2022

Abstract

The paper investigates the dynamic vibration property of the vehicle-bridge expansion joint coupled system with the proposed model. The dynamic response of the expansion joint under the action of the vehicle is the key factor affecting the life of the expansion joint. The changes of contact state and tire geometric characteristics were frequently left aside in the past to simplify the tire model. This is because the contact between tire and expansion joint is a very complex process. But this will seriously underestimate the impact effect of the vehicle on the expansion joint. In this paper, a dynamic mathematical model of the 2-axle vehicle-modular bridge expansion joint (MBEJ) coupled system is established by introducing a flexible roller tire model. The influence of tread rigid displacement and change in the tire contact patch length are considered in the dynamic model. Based on this model, the characteristics of the dynamic tire load and the center beam vibration displacement in the coupled system are obtained by simulation. The results show that the maximum dynamic tire load of the vehicle occurs at the end of the bridge deck behind the MBEJ, so local structure reinforcement needs to be considered. The interaction between the front and rear wheels of the 2-axle vehicle can be ignored. The vehicle position, vehicle velocity, gap width, and spring stiffness of the center beam bearing have significant effects on the impact factors of tire load and center beam vibration displacement. The impact factor of tire load may exceed the recommended values of Chinese and European bridge codes. These should be taken seriously.

1. Introduction

Bridge Expansion joints are exposed to the environment of high humidity, large temperature difference, and strong vibration for a long time, which are potential weak spots. The performance of the modular bridge expansion joint (MBEJ) based on the static performance indices cannot meet the requirements of bridge heavy load and heavy traffic flow, and its life span is greatly reduced [1, 2]. Therefore, it is of great significance for the design and maintenance of expansion joints and bridges to study the dynamic characteristics of MBEJs under passing vehicles.

The vibrations of MBEJs include vertical vibration and horizontal vibration. At present, there are few analyses on the dynamic performance of expansion joints. The impact effect of MBEJ vertical vibration is the main reason for the failure of center beam weld [3]. The horizontal vibration mainly affects the safety of the connection between the bridge deck and the MBEJ and the service life of the sliding bearing [4–6]. The research by Shun et al. [7] on the interaction between vertical vibration and horizontal vibration of MBEJs showed that the vibrations in two directions are independent of each other, so they can be studied separately. At present, there are few analyses on the vertical vibration performance of expansion joints. A study by Steenbergen [8] on the impact factor of an MBEJ showed that the impact factor of expansion joints can be as high as 1.7, which is much higher than those prescribed in the current design code. Ancich et al. [9] completed the experimental modal analysis and operational response shape studies on an MBEJ installed in the Anzac Bridge to indicate that the dynamic range factor can be reduced by introducing additional damping. Li [10] and Yan [11] analyzed the influence of vehicle velocity, joint gap width, and spring stiffness of the center beam bearings on the vertical dynamic characteristics of an MBEJ by using sine loads to simulate the action of vehicle. The MBEJ is often regarded as an independent system to study its dynamic property, which can simplify the model to a certain extent. The interaction between the vehicle and the MBEJ is not considered in this type of model. This will lead to too large deviations in the solution results of this type of model in the high-frequency vibration region. Therefore, the coupled effect between vehicles and MBEJ needs to be considered [12].

To make the simulation results more accurate, Wu et al. [13] established a numerical model of vehicle-steel box-girder based on rigid wheel model to verify that the existence of expansion joints significantly increases the impact effect of vehicles on the bridge. Sun and Zhang [14] applied a single-DOF vehicle model to the finite element model of a vehicle-MBEJ coupled system to analyze the vibration characteristics of the MBEJ. The results showed that the vehicle loads will cause the significant dynamic response of the MBEJ. Deng et al. [15] proved that the damage condition of expansion joints has a signiﬁcant impact on the bridge deck by establishing a vehicle-bridge coupled model in which the expansion joint was defined as a road-surface profile according to the damage degree of the expansion joint. Friedl and Mangerig [16] and Mangerig and Friedl [17] proposed a vehicle-expansion joint coupled system model based on a plane tire model to analyze the dynamic response of the coupled system when the vehicle passed through the expansion joint. The model considered the nonuniform pressure distribution in the contact area between the tire and the center beam. Ding et al. [18, 19] proposed a distributed spring-damper element for dynamic simulation of vehicles passing through expansion joints, in which the contact patch between the tire and the expansion joint was considered. However, the existing mathematical models do not consider the change in the tire contact patch length, which will cause the impact of tire load in the calculation process to be overestimated, resulting in the limitations of the use of models. Therefore, it is necessary to establish a more precise model for the contact relationship between the tire and the expansion joint in the coupled system model.

In this paper, a dynamic mathematical model of the vehicle-MBEJ coupled system by introducing a flexible roller tire model is proposed. This model considers the excitation characteristics of the tire load. The validity of this model has been verified in our published paper [20]. Based on the dynamic mathematical model, the vibration characteristics of the coupled system is simulated, and the influence of the parameters on the impact factors of the tire load and the center beam are analyzed.

2. Dynamic Mathematical Model

Figure 1 shows an example of a vehicle-MBEJ coupled system. x is the width direction of the bridge deck, y is the vertical upward direction, z is the axial direction of the bridge deck, and the subscripts C, Z, and H denote the gravity center of the vehicle body, center beam, and crossbeam, respectively. The MBEJ in the model consists of 5 center beams and 10 crossbeams. Center beams are perpendicular to the driving lane, while crossbeams are laid parallel to the driving lane under the center beams. Center beams and the crossbeams are connected by sliding bearings, and crossbeams and the bridge are connected by bearings installed in displacement box. A 2-axle heavy vehicle is taken as an example.

2.1. The Vehicle Dynamic Model

The 7-DOF vehicle model [21] is proved to be efficient to simulate 2-axle heavy vehicle. The 7-DOF vehicle models are the vertical displacement, the roll and pitch angles of the vehicle body, and the four vertical displacements of the wheels. Based on the D’Alembert principle, the differential equation of the vehicle system is expressed aswhere M_V, C_V, and K_V are the mass matrix, stiffness matrix, and damping matrix of the vehicle system, respectively, A_V, V_V, and X_V are the acceleration vector, velocity vector, and displacement vector of the vehicle system, respectively, and R_V is the force vector of the vehicle system. The specific explanations of these parameters can be found in [21].

The parameters of the 2-axle heavy vehicle adopted in simulation are listed in Table 1.

2.2. The MBEJ Dynamic Model

The center beam and crossbeam are slender beams, of which the cross-section dimensions are far less than the lengthwise dimensions. Therefore, the vibration equations of the center beam and crossbeam can be obtained by Euler beam theory, and the calculation accuracy is proved to be acceptable [11]. Denoting the vertical displacement of the ith center beam as y_Zi(x, t), the vibration equation is given as follows.where E_Z is the elasticity modulus of the center beam, I_Z is the section inertia of the center beam, F_Hji is the supporting force from the jth crossbeam to the ith center beam, F_TLki(t), F_TRki(t) are the contact forces between the wheels of the kth axle and the ith center beam with subscripts TL and TR representing the left and right wheels of the vehicle, NJ is the total number of crossbeams, x_j is the x coordinate of the jth crossbeam central axis, NK is the total number of axles, and x_Lk, x_Rk are the x coordinates of the left and right wheels on the k^th axle. δ is the Kirchhoff function. The supporting force F_Hji(t) can be described aswhere k₁, c₁ are the spring stiffness and damping coefficient of the center beam bearing, y_Hj(z_i, t) is the displacement of the jth crossbeam at the coordinate z_i, and z_i is the z coordinate of the ith center beam central axis.

Similarly, the vertical displacement of jth crossbeam y_Hj(z, t) is expressed aswhere E_H is the elasticity modulus of the crossbeam, NI is the total number of center beams, F_Iij(t) is the supporting force from the ith center beam to the jth crossbeam, F_0hj(t) is the supporting force from bridge deck to the jth crossbeam, h is the bearing in the displacement box at the end of the crossbeam, and z_0h is the z coordinate of the bearing. The supporting force F_Iij(t) can be described as

For the supporting forces received by the crossbeam, we can obtainwhere k₂, c₂ are the spring stiffness and damping coefficient of the crossbeam bearing.

The structural parameters of the MBEJ adopted in simulation are listed in Table 2.

2.3. Contact Relationship between the Tire and the MBEJ

Due to the discontinuity of the top surface of the MBEJ, it is necessary to consider the local separation between the bottom of the tire and the MBEJ at the gap [19]. In order to accurately represent the contact relationship between the tire and the MBEJ, a tire model with the profile function of MBEJ’s top surfaces added to the revised flexible roller contact tire model [22, 23] is proposed [20], as shown in Figure 2. The compression deformations of the contact points between the kth tire and the MBEJ in the model are expressed aswhere is the profile function of MBEJ’s top surfaces, z_k is the z-direction displacement of the kth wheel axis, is the local z coordinate in the contact patch of the kth tire, −r₀ ≤ ≤ r₀, r₀ is the tire free radius, and y_Tsk is the static load-deflection of the kth tire. The profile function is given aswhere B_Z, H_Z are the width of the center beam top surface and the height of the center beam, respectively, and B is the gap width.

Then, the contact force between the kth tire and the MBEJ F_Tk(t) and the contact force between the kth tire and the ith center beam are given aswhere , are spring stiffness and damping coefficient of the kth tire vertical distributing, and a_ki is the contact patch length between the kth tire and the ith center beam. The tire vertical distributing spring stiffness k_Tk and damping coefficient c_Tk can be obtained by a simplified formula [24], expressed aswhere a_k is the half of contact patch length between the kth tire and contact surface. The a_k can be defined aswhere f is the load-deflection of the tire tread.

When radial tire is under load, the belt will have rigid displacement [25]; i.e., the wheel axis deviates from the tire center. Let f_b denote the rigid displacement, the tire load-deflection of the wheel axis Δy can be expressed aswhere r is the tire rolling radius.

2.4. Numerical Integration Method

With regard to the vehicle-MBEJ coupled system, the dynamic equation can be described aswhere M, C, and K are the mass matrix, damping matrix, and stiffness matrix of the system; the subscripts V and E represent the vehicle system and expansion joint system; X, V, and A represent the generalized displacement, velocity, and acceleration matrix; R is the generalized force matrix.

The simple fast explicit integration method [26] is used to solve (13). The initial conditions are listed as

A test of a four-axle vehicle passing an MBEJ has been completed to verify the accuracy of the vehicle-expansion joint coupled dynamics mathematical model. It shows that the dynamic model simulation results of the vertical velocity at the center beam test points match well with the test results. The deviations of the center beam maximum sinking displacement between the simulation results and the test results are less than 10%. The test method and conclusions have been published in [21] in 2021.

3. Impact Effect Evaluation

In the study of a vibration system, the impact factor is often used to evaluate the impact effect [8–10, 14–20]. In the vibration analysis of the vehicle-MBEJ coupled system, the impact of the dynamic tire loads and the impact of center beam vibration displacements are both very important. Therefore, two different impacts are adopted in this paper. In order to evaluate the impact effect of the dynamic tire loads, the dimensionless impact factor μ of the tire load is defined as [18–20]where F_Tmax is the maximum tire load, and F_Ts is the static tire load.

Then, in order to evaluate the impact effect of the center beam vibration displacements, the dimensionless impact factor IM of the center beam vibration displacements is defined as [8–11, 14–17]where y_max is the maximum displacement of the center beam due to the vehicle traveling at designated speed, y_s is the static displacement of the center beam due to a vehicle axle stopping directly above the center beam or the maximum displacement due to the vehicle traveling at low speed [9], and the velocity of 10 km/h [10] is adopted for y_s in the following study.

The impact factor μ can be applied to the design of the bridge local structure, and the impact factor IM can be applied to the design of expansion joints. In most cases, the values of these two factors are equal, but in the vehicle-expansion joint coupled system, we study them separately. The impact factors specified by some bridge design codes vary from country to country. The impact factors specified in Chinese bridge code [27] and European bridge code [28] are 0.3, and that in American bridge code [29] is 0.75.

4. Results and Analysis

4.1. Dynamic Response of Vehicle

Before the simulation, we set the basic simulation conditions, where km/h, B = 60 mm, k1 = 60 kN/m, and the center line of the left rear wheel contact patch passes through the midpoint of the center beam. The parameters in the following simulations are modified based on the basic conditions. The response of the vehicle wheels when the vehicle passes through the MBEJ is simulated by using the basic simulation conditions, as shown in Figures 3 and 4.

(a)

(b)

(a)

(b)

Figure 3 shows that both the vibration displacement waveforms and the vibration acceleration waveforms of the left and right tires are basically the same. Due to the large wheelbase, the interaction between the front and rear wheels can be ignored. Figure 4 shows that the dynamic loads of the left and right tires basically agree with each other, and the maximum loads of the front and rear wheels occur at the end of the bridge deck behind the MBEJ, which is consistent with the conclusion of Ding et al. [19]. The tire load impact factors μs of the left front and rear wheels are 0.23 and 0.24, respectively.

4.2. Dynamic Response of the MBEJ

Figure 5 shows that the vibration displacement response of the MBEJ center beams’ midpoints during the vehicle crossing though an MBEJ. Since the rear axle of the vehicle is heavier than the front axle, the maximum displacement of the center beam caused by the crossing rear wheels is greater than that caused by the crossing front wheels. The interaction of the center beam vibrations caused by the front and rear wheels can be ignored due to the large wheelbase. Therefore, the actions of the front and rear axles in a vehicle-MBEJ coupled system can be studied separately. The maximum displacement increases from 1st center beam to 5th center beam, which is consistent with the change of tire load on middle beams as shown in Figure 4. The simulation result at the midpoint of center beams is shown in Table 3. It shows that the impact factor IM of each center beam displacement by the crossing front wheels is greater than that of the rear wheels. The impact factors IMs of the 1st center beam displacement by the crossing front and rear wheels are the largest, which are 0.42 and 0.26, respectively. The impact factor IM of the center beam displacement is larger than the impact factor μ of the tire load.

The waveform of the dynamic tire loads acting on each center beam is approximately a sine wave, as shown in Figure 6, which verifies the assumption of tire load in [3, 5–7].

4.3. Parameters Affecting the Impact Factor μ of the Tire Load

In this part, the effects of the vehicle position, vehicle velocity, gap width, and spring stiffness of center beam bearing on the impact factor μ of the tire load are analyzed. When studying the effect of the vehicle position, the vehicle is considered to pass through an MBEJ from eight positions as shown in Figure 7. In positions 1, 3, 5, and 7, the left rear wheel of the vehicle passes directly above the crossbeams, and in other positions, the left rear wheel of the vehicle passes over the midpoints of the center beams span. The calculation results of the tire load impact factors μs are shown in Figures 8–11.

Figure 8 shows that when the left rear wheel of the vehicle passes directly above the beam (in positions 1, 3, 5, and 7), the tire load impact factors μs of the vehicle left wheels are all reduced, but the serial number of the crossbeam where a vehicle passes has little effect on the impact factors μs. When the vehicle drives in different positions, the maximum tire load impact factors μs of the left front and rear wheels are 0.23 and 0.24, respectively.

The relationship between the vehicle velocity and the impact factors μs of the tire loads is shown in Figure 9. The tire load impact factors μs of the vehicle left wheels increase with the vehicle velocity, and the maximum tire load impact factors μs of the left front and rear wheels are 0.33 and 0.34, respectively, which are greater than 0.3 but less than 0.75.

The gap width of the MBEJ will affect the tire load amplitude on a center beam and the time in which the wheel passes through a center beam. As the gap width increases, the maximum tire load acting on a center beam increases, causing the maximum displacement of the center beam to increase, which eventually leads to an increase in the impact of the tire load. Therefore, the tire load impact factors μs of the vehicle wheels rise with the increase of gap width, as shown in Figure 10. The maximum tire load impact factors μs of the left front and rear wheels are 0.34, which are greater than 0.3 but less than 0.75.

Figure 11 shows that the tire load impact factors μs of the vehicle wheels decrease slowly with the increase of the center beam bearing’s spring stiffness. This is because as the spring stiffness of the center beam bearing increases, the maximum sinking displacement of the center beam gradually decreases, resulting in a decrease in the axle displacement. However, when the spring stiffness of the center beam bearing increases to more than 80 kN/mm, this decreasing trend becomes slower. Therefore, in the design of the MBEJ, the center beam bearing’s spring stiffness of 80 kN/mm can be a preferred recommended value.

4.4. Parameters Affecting the Impact Factor IM of the Canter Beam Displacement

To evaluate the effects of the vehicle position, vehicle velocity, gap width, and spring stiffness of center beam bearing on the impact factor IM of the center beam displacement, a series of simulations are performed, and the calculation results are shown in Figures 12–15.

(a)

(b)

(a)

(b)

(a)

(b)

(a)

(b)

Figure 12 illustrates the effect of vehicle position on the impact factors IMs of the canter beam displacement. Similarly to impact factor μ of the tire load (see in Figure 8), the impact coefficients IMs of the center beam displacement decrease when the left rear wheel of the vehicle passes directly above the beam (in positions 1, 3, 5, and 7), and this decreasing trend is more obvious when the front wheels pass by. The impact factors IMs are hardly affected by the serial number of the crossbeam at the position where a vehicle passes. The maximum impact factors IMs of the 1st center beam displacement by the crossing front and rear wheels are 0.43 and 0.28, respectively. The calculated impact factors IMs of the 1st center beam displacement by the crossing front wheel are greater than 0.3 but less than 0.75.

Figure 13 shows that the impact factor IM of each center beam displacement fluctuates with the increase of vehicle velocity when the vehicle velocity is less than 60 km/h. However, when the vehicle velocity is greater than 60 km/h, the impact factor IM of each center beam displacement increases rapidly. The influence of vehicle velocity on the impact factor IM is complex [15], which may be related to the contact time between the wheel and center beam. When the vehicle passes the MBEJ at 120 km/h, the factor IM of 1st center beam displacement by the crossing front and rear wheels is the largest, which is 0.55 and 0.42, respectively. Both are greater than 0.3 but less than 0.75.

Figure 14 shows that the impact factors IMs of all center beams displacement except 3rd beam first decrease and then increase with the increase of the gap width, which is due to the influence of the gap width on the contact time and tire load between the wheel and a single center beam. The impact factor IM of the 3rd center beam fluctuates with the increase of the gap width. When the gap width is 80 mm, the impact factor IM of 1st center beam displacement by the crossing front and rear wheels reaches maximums of 0.66 and 0.49. Both are greater than 0.3 but less than 0.75.

The effect of the center beam bearing’s spring stiffness on the impact factor IM of the center beam displacement is shown in Figure 15. The impact factor IM of each center beam displacement decreases with the increase of the center beam bearing’s spring stiffness. However, the decreasing trend slows down when the spring stiffness of the center beam bearing increases to greater than 80 kN/mm. Similar results were obtained by Li et al. [10].

5. Conclusions

In this paper, a dynamic mathematical model of a vehicle-expansion joint coupled system is established with a flexible roller tire model. The numerical simulations are carried out with different system parameters to study the dynamic response of the coupled system. Two impact factors μ and IM are defined to evaluate the dynamic impact effects of the tire load and the center beam displacement. The following conclusions can be drawn from the studies:(1)For the 2-axle vehicle, the interaction between the front and rear wheels can be ignored when the vehicle passes through the MBEJ, so they can be studied separately. The impact factor μ increases with the vehicle velocity and the gap width. This implies that limiting the vehicle velocity contributes to improving the vehicle safety, especially in winter with a big gap.(2)For the bridge expansion joint, the tire loads on the edge beam and the concrete at the end of the bridge deck are the largest. The strength of the connection between the MBEJ and the bridge deck should be considered during the design of an MBEJ. The impact effects of the vehicle and the expansion joint can be improved when the vehicle wheel passes directly above the crossbeam. Therefore, the position design of the crossbeams should take into account the distribution of tire road imprints during the design of an MBEJ. However, the relationships of the impact factor IM with the speed and the gap width are not monotonous functions. When the vehicle speed is 60 km/h or the gap width is 40 mm, the impact factor IM will decrease suddenly. The increase of the center beam bearing’s spring stiffness can reduce the impact of both vehicle and expansion joint.(3)The calculated impact factor IM is greater than the impact factor μ. Therefore, a distinction should be made when using impact factors for static calculations. The maximum impact factor μ can reach 0.34, and the maximum impact factor IM can reach 0.58. Both impact factors may exceed the values specified by the Chinese or European bridge codes.

The simulation results will provide useful guidance for the design and maintenance of expansion joint and bridge. However, the interaction between the parameters and the influence of different types of vehicles on the vehicle-expansion joint coupled system have yet to be achieved. These issues remain potential topics of future work.

Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

Acknowledgments

This research was supported by the National Science Foundation for Distinguished Young Scholars of China (Grant no. 51805166).

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Copyright © 2022 Lu Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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