## 1 Introduction  
The corrugated steel web box girder bridge is a composite structure comprising concrete top and bottom slabs connected to corrugated steel webs via connectors, with a prestressing system as a reinforcement. The corrugated steel web replaces the traditional concrete webs of prestressed concrete box girders, allowing each material to fully utilize its strengths [1]. Its advantages lie in the bending resistance provided by the concrete top and bottom slabs and the shear resistance of the corrugated steel webs, which reduce the self-weight of the box girder and enhance the efficiency of prestress application [2]. Consequently, corrugated steel web box girder bridges have been widely adopted worldwide. Since the completion of the Cognac Bridge in France in 1986, Japan has taken the lead in conducting extensive research on this type of bridge. It has also successively constructed several corrugated steel web box girder bridges, including the Shinkai Bridge, Hontani Bridge, and Himiyume Bridge [3]. Currently, research on corrugated steel web box girders has primarily focused on static performance aspects such as bending resistance [4], shear resistance [5; 6], torsional resistance [7; 8], buckling behavior [9], and shear lag effects [10], while studies on dynamic performance have been relatively limited [11; 12]. [PERSON] et al. [13] studied the influence of geometric parameters on the natural vibration characteristics of corrugated steel web box girders. [PERSON] et al. [14] derived an analytical formula for the natural vibration frequencies of corrugated steel web box girders based on the principle of energy variation. They obtained analytical solutions for the natural frequencies of various modes while considering shear deformation and shear lag effects. [PERSON] et al. [15], through model tests and finite element analysis, found that the torsional stiffness of corrugated steel web box girders is lower than that of traditional concrete box girders. Additionally, they also discovered that adding diaphragms in the end regions can enhance torsional stiffness. [PERSON] et al. [16] studied the influence of cross-sectional configurations on the dynamic characteristics of corrugated steel web box girders. They revealed that the torsional stiffness of a twin-box, twin-cell section is lower than that of a single-box, twin-cell section. Existing studies have demonstrated that, compared to traditional concrete box girders, corrugated steel web box girders exhibit some different dynamic characteristics, including reduced lateral bending stiffness and torsional stiffness. Therefore, investigating the vehicle-bridge coupling vibration of corrugated steel web box girder bridges is essential. However, related studies remain limited. [PERSON] [17] found that installing diaphragms improves the overall stability and vibration performance of box girders. [PERSON] et al. [18] examined the influence of damping ratios on the vehicle-bridge coupling vibration response of corrugated steel web box girders. [PERSON] et al. [19] investigated the differences between local and global dynamic impact factors of corrugated steel web box girder bridges. The above studies all assume that the pavement roughness in contact with the left and right wheels is the same, namely two-dimensional pavement roughness. However, this assumption does not accurately reflect the real-world conditions of highway bridges. [PERSON] et al. [20] measured the three-dimensional pavement roughness of highway bridges, and the results showed that the inconsistency in roughness between the left and right wheels was common in highway bridges. Therefore, three-dimensional pavement roughness should be considered in vehicle-bridge coupling studies to better reflect actual pavement conditions. Vibration issues in engineering structures are very common [21], and vehicle-bridge coupling vibration analysis is beneficial for studying bridge damage identification methods based on vehicle-induced vibration responses [22].