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

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...

AI Technical Summary

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, or is tending to be damaged beyond its normal bearing capacity? It is difficult to determine the status at present, which will directly affect the design of the structure, the effective use of the structure and the force analysis

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