Method for simulating wind-wave coupling load value of lower structure of large-span bridge

Abstract

The invention provides a method for simulating a wind-wave coupling load value of a lower structure of a large-span bridge, which solves the multiple coupling problems of interaction of the environment and the structure from the three aspects of coupling of the wind and the wave, coupling of the wind and the structure and coupling of the wave and the structure in a simulation process. The method comprises the following steps of firstly, implementing synchronous coupling simulation in time domains of two random processes of the wind and the wave through coupling of a pulse wind speed spectrum and a wave frequency spectrum; secondly, implementing coupling simulation of the wind and the structure through the pulse wind speed spectrum of the peripheral wind field of a Reynolds stress tensor correction structure; lastly, implementing coupling simulation of the wave and the structure through an MacCamy-Fuchs diffraction theory. The method comprehensively applies a computational fluid dynamics (CFD) method, a fast Fourier transform (FFT) method, a proper orthogonal decomposition (POD) method and a frequency interpolation method, and the method has the advantages of high computational efficiency, simple simulation process and clear physical significance and can be popularized to simulation of the wind-wave coupling load value of the other ocean-like structures.

Description

technical field [0001] The invention relates to a method for numerical simulation of wind-wave coupling load on the lower structure of a long-span bridge, in particular to multiple interaction between environment and structure in the three aspects of wind-wave coupling, wind-structure coupling, and wave-structure coupling in the numerical simulation process Solutions to coupling problems. Background technique [0002] The substructure of long-span bridges will bear complex random environmental loads that vary with time and space during construction and operation, mainly including wind loads and wave loads. A large number of studies have shown that the two environmental elements of wind and waves interact with each other, and there is a strong coupling characteristic. The mutual coupling of wind and waves makes the characteristics of sea surface wind field significantly different from that of land wind field, mainly manifested in the fact that the wall surface of the wind fi...

AI Technical Summary

Problems solved by technology

Generally speaking, the environmental load action data comes from on-site measurement or numerical simulation; the former has good reliability, but requires high equipment and instruments and takes a long time; the latter has strong adaptability and short time consumption, but rarely considers wind, mutual coupling of waves

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