Multi-point seismic oscillation synthesis method and system

Abstract

The invention belongs to the related technical field of seismic oscillation detection, and discloses a multi-point seismic oscillation synthesis method, which comprises the following steps: S1, acquiring a power spectral density function at a bedrock; S2, simplifying a soil layer on the bed rock into a homogeneous soil layer which is horizontally layered to acquire a transfer function from a bed rock to the homogeneous soil layer; S3, according to the power density function of the bedrock and the transfer function of the homogeneous soil layer, obtaining transfer functions of the homogeneous soil layer from each point of the bedrock in the X, Y and Z directions, and further obtaining a self-power spectral density function and a cross-power spectral density function of the homogeneous soillayer; and S4, synthesizing the seismic oscillation acceleration of the homogeneous soil layer according to the self-power spectral density function and the cross-power spectral density function of the homogeneous soil layer. The invention further provides a multi-point seismic oscillation synthesis system. By means of the method and system, accurate representation of seismic oscillation can be achieved, meanwhile, the requirement of the system for the professional level of a user is low, and research and design efficiency is effectively improved.

Description

technical field [0001] The invention belongs to the technical field related to earthquake motion detection, and more specifically relates to a multi-point earthquake motion synthesis method and system. Background technique [0002] Earthquake motion has the characteristics of randomness and spatial variation. For the seismic research of long and large structures such as bridges and subway tunnels, the random multi-point ground motion time history with spatial variation characteristics is generally used. However, at present, there is no related computer-aided system that can directly obtain multi-point ground motions or multi-point ground motion responses at home and abroad. At present, there are only computer software SHAKE91 and DEEPSOIL for calculating site responses and a computer for directly synthesizing single-point ground motions. System SEISMOARTIF. Both SHAKE91 and DEEPSOIL assume that the site is a one-dimensional horizontal layered model. After inputting the site...

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Problems solved by technology

However, SHAKE91 is a DOS interface, which is cumbersome to operate and cannot adapt to the usage habits of modern scientific researchers or engineers. DEEPSOIL is a GUI human-computer interaction interface and considers the influence of the nonlinearity of the site on the simulated acceleration response. However, this system and SHAKE91 relies on the given existing acceleration records, and cannot calculate random acceleration responses by itself, so it cannot meet the needs of structural reliability analysis, parameter sensitivity analysis, etc.

The SEISMOARTIF system has nothing to do with the site conditions, and can only rely on the site response spectrum given by the user to calculate the corresponding single-point random acceleration time history, which is divorced from the actual engineering to a certain extent

In addition, the above three systems do not consider the spatial variability of ground motions, and can only obtain the time history of single-point ground motions, which cannot meet the needs of seismic research on longer and larger structures; the above three structures all assume vertical incidence of ground motions, The incident angle of the bedrock ground motion is not considered, and only a single component of the ground motion is considered, and the out-of-plane horizontal, in-plane horizontal and in-plane vertical components of the ground motion are not considered at the same time

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