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Main shock-aftershock sequence-based method for estimating damage index

A damage index and aftershock technology, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., to achieve simple and practical effects

Active Publication Date: 2016-04-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the damage spectrum models proposed by scholars are all based on the main shock acting alone, while ignoring the impact of aftershocks on the structure. Therefore, the proposed damage spectrum model based on the main aftershock is of great significance for the performance evaluation of existing structures.

Method used

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  • Main shock-aftershock sequence-based method for estimating damage index
  • Main shock-aftershock sequence-based method for estimating damage index
  • Main shock-aftershock sequence-based method for estimating damage index

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specific Embodiment approach 1

[0028] Embodiment 1. A damage index evaluation method based on the main aftershock sequence described in this embodiment is carried out in the following steps:

[0029] 1. Select a structural hysteresis model according to the actual ground motion type;

[0030] 2. Select the period, mass, and damping of the single-degree-of-freedom structure, and calculate the dynamic characteristics of the structure;

[0031] 3. Conduct elastic analysis according to the selected ground motion type and structural characteristics, and obtain the elastic strength requirement F e ;

[0032] 4. Select the value of the strength reduction factor R, and calculate the yield strength F of the non-elastic structure y ;

[0033] 5. Calculate the response of the hysteretic model of the structure under the action of the earthquake according to the structural dynamic method, and obtain the damage index DI of the structure according to the damage calculation formula;

[0034] 6. According to the statisti...

specific Embodiment approach 2

[0038] Specific embodiment 2. This embodiment is a further description of the damage index evaluation method based on the main aftershock sequence described in the specific embodiment 1. The hysteresis model described in step 1 is: ideal elastic-plastic model or modified Clough model or pinch model or stiffness-strength degradation model based on the three-parameter model proposed by Park et al.

specific Embodiment approach 3

[0039] Specific Embodiment 3. This embodiment is a further description of the damage index evaluation method based on the main aftershock sequence described in the specific embodiment 1 or 2. The earthquake type described in step 1 is only one main shock or One main shock plus one aftershock or one main shock plus two aftershocks.

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Abstract

The invention relates to a main shock-aftershock sequence-based method for estimating a damage index, and aims at solving the problem that influence of an aftershock to a structure is ignored due to the fact that only single action of a main shock is considered in an existing method for estimating an earthquake damage index. The main shock-aftershock sequence-based method disclosed by the invention comprises the following steps: I: selecting a structural hysteresis model according to an actual earthquake motion type; II: selecting a period, mass and damping of a single-degree-of-freedom structure, and calculating a structural dynamic characteristic; III: performing elastic analysis on selected earthquake motion and the structural characteristic to obtain an elastic strength demand Fe; IV: selecting a strength reduction factor value R, and working out yield strength Fy of an inelastic structure; V: working out a reaction of the structure under action of an earthquake according to a structural dynamic method, and working out the damage index DI according to a damage calculation formula; VI: presenting a damage spectrum prediction model of a main shock-aftershock sequence according to a statistical result of the structural damage index DI. The main shock-aftershock sequence-based method for estimating the damage index disclosed by the invention can be applied to the field of earthquake engineering.

Description

technical field [0001] The invention relates to the field of earthquake engineering, in particular to a damage index evaluation method based on main aftershock sequences. Background technique [0002] Historical seismic data show that a large main shock is often accompanied by a large number of aftershocks. The structure will suffer aftershocks in a short period of time after the main shock. In this case, the structure has already suffered some damage under the main shock and cannot be repaired. The additional damage to the structure caused by the aftershock will cause the structure to Further damage or even collapse will cause severe earthquake property loss and casualties, which is also proved by many earthquake damage data. However, the seismic design codes in my country and even in the world do not consider the adverse effects of aftershocks on structures. Therefore, evaluating the behavior of existing structures under the action of main aftershocks is of great signific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 温卫平翟长海籍多发李爽谢礼立
Owner HARBIN INST OF TECH
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