Beam structure initial state recognition method based on displacement and corner

A technology of initial state and identification method, applied in the field of civil engineering, can solve problems such as inconsistency of initial state, evaluation, damage identification deviation, etc., and achieve the effect of fewer influencing factors, simple and convenient operation, and strong operability
CN111460558AActive Publication Date: 2020-07-28GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
Publication Date
2020-07-28

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Abstract

The invention discloses a simply supported beam initial state recognition method based on displacement and a corner. The method comprises the following steps: segmenting a beam body; testing the vertical displacement and the rotation angle of the beam body at the subsection under the known load effect; basic mechanics principle, based on displacement and corner test values under the known load effect, the bending rigidity value and the shearing rigidity value of each beam section are obtained through backstepping, and finally according to the principle that bending strain energy and shearing strain energy are equal, the equivalent bending rigidity and shearing rigidity of the beam structure are obtained through derivation, so that important initial state information of the beam structure is obtained. According to the method, the bending resistance and the shearing rigidity of the beam structure can be identified only by knowing the vertical displacement and the corner test value underthe action of the load, and the method has the advantage of high operability; furthermore, an analysis method is adopted, a complex finite element model does not need to be established for multiple iterations, and the efficiency is higher; in addition, the method can be applied to bearing capacity evaluation, model correction and damage recognition of the beam structure, and has a wide applicationprospect.
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Description

technical field

[0001] The invention relates to the technical field of civil engineering, in particular to a method for identifying the initial state of a beam structure based on displacement and rotation angle. Background technique

[0002] Beam structure, as one of the most basic components in civil engineering, is used in various places, such as main beams and stiffening beams in bridge structures; primary and secondary beams in house structures, etc. As a beam structure, it mainly bears bending moment and shear force, and the corresponding important evaluation indicators are bending stiffness and shear stiffness. Bending stiffness is the product of the elastic modulus E of the structural material and the moment of inertia I of the section, which reflects the ability of the structure to resist deformation. The shear stiffness calculation formula is GA / r (where, G is the shear modulus of the structural material, A is the cross-sectional area, r is the cross-section shear ...

Claims

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