Method for determining performance state of any point in displacement space of three-dimensional plastic hinge

A technology of plastic hinge and arbitrary point, which is applied in the field of determining the performance state of any point in the displacement space of three-dimensional plastic hinge and determining the performance of plastic hinge, which can solve the problems affecting the effective use of structural design and force analysis.

Inactive Publication Date: 2016-06-01
CHONGQING UNIV
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  • Abstract
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Problems solved by technology

At the same time, what is the performance state of any point in the displacement space? Is it in a state of bearing stress and has the ability to reload external force, or is it at the critical point of failure or has been damaged,

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  • Method for determining performance state of any point in displacement space of three-dimensional plastic hinge
  • Method for determining performance state of any point in displacement space of three-dimensional plastic hinge
  • Method for determining performance state of any point in displacement space of three-dimensional plastic hinge

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Embodiment Construction

[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] The traditional evaluation method is faced with an initial yield point (according to the definition of the analyst), while the three-dimensional plastic hinge will have an infinite number of initial yield situations, and each initial yield situation has a point corresponding to it in the displacement space, so that there are countless initial yield situations. The yield displacement points form an initial yield displacement surface. However, the elastic-plastic response of the structure will be at any point in the displacement space, and the ductility coefficient of each point must obviously be evaluated according to the initial displacement yield surface. For this reason, the present invention makes following definition to generalized ductility coefficient:

[0030] Select a point O in the initial displacement yield surface, ...

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Abstract

The present invention discloses a method for determining a performance state of any point in a displacement space of a three-dimensional plastic hinge. The method comprises: 1) determining an initial displacement yield surface of the three-dimensional plastic hinge; 2) determining a displacement performance surface of the three-dimensional plastic hinge; 3) selecting one point O on the initial displacement yield surface, and connecting any one point M in a displacement space to the point O to form a straight line, wherein the straight line intersects with the initial displacement yield surface at one point R and intersects with the displacement performance surface at one point Q, and MR/QR is defined as a correction energy-requiring ratio; according to the correction energy-requiring ratio, determining a performance state of the any one point M of the displacement space. By adopting the method, the performance state of any point in the displacement space of the plastic hinge can be easily determined to judge the performance of an actual structure under the action of a certain load and guide structural design, and the method is particularly applied to the design and the analysis of earthquake resistance of the structure.

Description

technical field [0001] The invention relates to plastic hinge performance determination, specifically a method for determining the performance state of any point in a three-dimensional plastic hinge displacement space. The method can also be used for the existing one-dimensional plastic hinge analysis, and belongs to the technical field of plastic hinge performance evaluation. Background technique [0002] At present, plane models are usually used to analyze the elastoplasticity of structures. Plastic hinges are usually one-dimensional bending hinges, and the concept of one-dimensional ductility is also used for performance evaluation, such as figure 1 shown. figure 1 is a simple one-dimensional force-deformation curve, F Y and D Y are the forces and deformations in the initial yield state, at D 1 The ductility in the state is D 1 / D Y . [0003] However, with the development of computers and calculation methods, structural elastic-plastic analysis has also entered the...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 符芮三付巧英白绍良
Owner CHONGQING UNIV
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