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Near-fault seismic acceleration time-history fitting method capable of representing ground permanent displacement

A technology of seismic acceleration and displacement time history, applied in seismology, seismic signal processing, geophysical measurement, etc., can solve problems such as finding

Active Publication Date: 2019-10-29
INST OF GEOPHYSICS CHINA EARTHQUAKE ADMINISTRATION
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Problems solved by technology

However, in practical engineering applications, it is difficult to find seismic acceleration time history that satisfies multiple objectives at the same time, especially including permanent ground displacement, as seismic input data from actual seismic records. Therefore, it is necessary to develop corresponding earthquake motion simulation methods based on different objectives to meet engineering application needs

Method used

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  • Near-fault seismic acceleration time-history fitting method capable of representing ground permanent displacement
  • Near-fault seismic acceleration time-history fitting method capable of representing ground permanent displacement
  • Near-fault seismic acceleration time-history fitting method capable of representing ground permanent displacement

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Embodiment 1

[0089] For a bridge spanning a fault, the distance between the bridge pier and the fault is about 2 km, and the impact of the near-fault pulse characteristics and permanent displacement of the ground motion input should be considered during design. The research results show that the peak value of the seismic acceleration time history corresponding to the 50-year return period with a probability of 2% is about 0.69g. Considering the impact of the earthquake surface rupture, the one-time sudden displacement value of the bridge is: the vertical dislocation of the upper and lower walls of the fault is 1.4 m, the horizontal distance is 0.8m (calculated according to the inclination angle of 60° left and right), and the right-handed horizontal displacement is <1.4m.

[0090] When fitting the horizontal seismic acceleration time history, the initial ground motion is the acceleration record of the 1992 Lander earthquake measured by the acceleration sensor, the peak value of 0.69g is use...

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Abstract

The invention relates to a near-fault seismic acceleration time-history fitting method capable of representing ground permanent displacement. The method comprises the following steps: forming an initial seismic acceleration time history, carrying out first baseline adjustment on initial seismic oscillation, extracting second baseline correction parameters of the seismic acceleration time history,carrying out multi-target-based seismic acceleration time history adjustment, evaluating target parameters and the like. The near-fault seismic acceleration time history fitting method capable of representing the ground permanent displacement is adopted; the seismic acceleration record obtained by the method can meet the requirements of an acceleration response spectrum and peak acceleration, canreflect the characteristics of near-fault seismic oscillation velocity pulses, can represent the permanent displacement of the ground, and can provide input data of a seismic acceleration travel withextremely high reference during aseismic design.

Description

technical field [0001] The present application relates to a near-fault seismic acceleration time-history fitting method capable of characterizing permanent ground displacement, which is applicable to the technical field of seismic design. Background technique [0002] Permanent ground displacement refers to the ground deformation caused by fault dislocation during an earthquake. Such as figure 1 and 2 The time history of seismic acceleration, velocity and displacement in the east-west direction of Wenchuan seismic station 051PXZ is shown, and the corresponding permanent displacement is about 56cm. Many large earthquake engineering damages in history have shown that the permanent large displacement of the near-field ground is the main reason for the final collapse of buildings or structures. Therefore, long-period In the seismic design of structures, it is necessary to pay attention to the displacement of the seismic input, especially when there is permanent displacement n...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/30G01V1/32
CPCG01V1/282G01V1/307G01V1/32
Inventor 俞瑞芳张斌
Owner INST OF GEOPHYSICS CHINA EARTHQUAKE ADMINISTRATION
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