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Building wall damage assessment method in blast accident

A technology for building walls and explosion accidents, used in special data processing applications, complex mathematical operations, instruments, etc., can solve problems such as inability to accurately evaluate the anti-explosion performance of walls

Active Publication Date: 2021-03-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

For the dynamic calculation of structures impacted by transient explosions, the static load method is no longer applicable, and the force of t

Method used

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  • Building wall damage assessment method in blast accident
  • Building wall damage assessment method in blast accident
  • Building wall damage assessment method in blast accident

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Embodiment Construction

[0092] The invention provides a method for assessing building wall damage in an explosion accident, which mainly includes the following steps:

[0093] Step 1. Based on the equivalent single-degree-of-freedom method, the motion equation of the response of the wall component under the action of the explosion load is established;

[0094] Based on the equivalent single-degree-of-freedom method, the motion of the building wall is simplified to a one-dimensional motion in the characteristic direction, such as figure 1 shown.

[0095] In the equivalent single-degree-of-freedom system, four basic forces are defined: equivalent external load, equivalent resistance force, inertial force, and damping force. The equivalent external load is the instantaneous dynamic force from the explosion, namely F e (t). The equivalent resistance comes from the restoring force of the spring element in the model and the structural potential energy, with K e x(t) means. The inertial force is define...

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Abstract

The invention discloses a building wall damage assessment method in a blast accident, which comprises the following steps: (1) based on an equivalent single-degree-of-freedom method, establishing a motion equation of wall member response under the action of blast load; (2) selecting an iterative solving time interval according to the natural vibration period of the component, and determining a component displacement recursion formula; (3) simultaneously establishing a displacement recursion formula and a motion equation to solve the displacement, drawing a change curve of the displacement of the equivalent degree-of-freedom system along with time, and obtaining the peak displacement of the component according to the change curve; and (4) solving a support corner of the component accordingto the peak displacement of the component, and evaluating the damage effect of explosion on the wall component by utilizing the support corner. According to the invention, the influence of structuralpower system damping is considered, the situation that the periphery of the wall is supported by the supports at the same time is considered through the bidirectional stress model and is closer to theactual stress condition of the wall, and damage to the building wall in a burning and explosion accident can be evaluated more accurately compared with a one-way stress model.

Description

technical field [0001] The invention relates to the technical field of building anti-blast performance evaluation, in particular to a method for evaluating damage to building walls in explosion accidents. Background technique [0002] Explosion accidents in petrochemical sites are extremely destructive, often causing heavy casualties and economic losses. For buildings where people are concentrated, according to relevant research, up to 75% of the civilian casualties in explosion accidents come from the splash damage caused by the explosion caused by fragments of building glass, walls, etc., that is, secondary fragment damage, rather than from the blast wave. direct-acting damage. [0003] New construction of anti-blast buildings, improvement of anti-blast capabilities of existing buildings, and prevention of domino effects caused by explosion accidents, overall collapse of buildings and splashing of explosion debris can significantly reduce property losses and casualties in...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F17/11G06F119/14
CPCG06F30/20G06F17/11G06F2119/14
Inventor 顾蒙王旱祥王琼
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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