Abstract
To investigate the dynamic response characteristics of deep-water bridge pier pile group foundations under wave-current coupling action, the JONSWAP spectrum was selected to simulate the nonlinear effects of waves, MATLAB software was used to program and solve the time-history curves of wave-current forces, a three-dimensional finite element model of the #3 pier structure of the Taihe-Ganjiang River Bridge was established using ANSYS numerical analysis software to simulate the response patterns of deep-water bridge pier pile group foundations under wave-current coupling action, and transient dynamic analysis was conducted. The results show that: the displacement at the pier top of the foundation exhibits a cumulative trend; the displacement, stress, and strain at the pier body, pier bottom, and pier top display nonlinear fluctuation characteristics: the transverse bridge deformation is maximum at the pier top, gradually decreases downward, with the minimum value at the pile top; the maximum stress and strain of the pier body are located at the still water level and at the intersection of the pier bottom and the cap, respectively, while the minimum values are located at the pier top and pile top. These research results can provide theoretical guidance for the design, operation, and maintenance of deep-water bridge pier foundations.
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Preamble
Numerical Study on the Dynamic Response of Pile Foundation of Deepwater Bridge Piers Under Coupled Wave-Current Load
WU Wenbing¹,², JIN Rengui¹, CHEN Libo²
¹ China Railway 16th Bureau Group Third Engineering Co., Ltd., Huzhou 313002, China
² Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China
Abstract
To investigate the dynamic response characteristics of pile group foundations for deepwater bridge piers under coupled wave-current loading, the Huizhan spectrum was employed to simulate nonlinear wave effects. MATLAB programming was utilized to solve for the time-history curves of wave-current forces. A three-dimensional finite element model of Pier 3# of the Taihe Ganjiang River Bridge was developed using ANSYS numerical analysis software to simulate the response behavior of the deepwater pier pile group foundation under coupled wave-current action, and transient dynamic analysis was performed. The results demonstrate that displacement at the pier top exhibits a cumulative trend, while displacements, stresses, and strains at the pier body, bottom, and top display nonlinear fluctuation characteristics. Transverse deformation reaches its maximum at the pier top, gradually decreasing downward to a minimum at the pile top. The maximum stress and strain in the pier body occur at the still water level and at the intersection between the pier bottom and the cap, respectively, whereas minimum values are observed at the pier top and pile top. These findings can provide theoretical guidance for the design, operation, and maintenance of deepwater bridge pier foundations.
Keywords: deepwater bridge pier; pile group foundation; dynamic response; coupled wave-current action; numerical calculation; three-dimensional finite element model