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Practical method for calculating length coefficient of shaft pressure rod considering constraint influences of fixed spring hinges at two ends

A technique for calculating length coefficients and fixing springs, used in computer-aided design, calculation, special data processing applications, etc.

Inactive Publication Date: 2018-06-29
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention mainly solves the technical problems existing in the calculation of the length coefficient of the existing axial pressure stability calculation; it provides a practical calculation method for calculating the length coefficient of the axial pressure rod considering the influence of the constraints of the fixed spring hinges at both ends

Method used

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  • Practical method for calculating length coefficient of shaft pressure rod considering constraint influences of fixed spring hinges at two ends
  • Practical method for calculating length coefficient of shaft pressure rod considering constraint influences of fixed spring hinges at two ends
  • Practical method for calculating length coefficient of shaft pressure rod considering constraint influences of fixed spring hinges at two ends

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Effect test

Embodiment 1

[0142] The strength is Q420, the limb width is 220mm, the limb thickness is 20mm, the length is 2604mm, both ends are constrained by spring supports, and the rotational stiffness of the bottom support is R a The rotational stiffness R of the top support is 4550kNm b Taking a high-strength and large-size angle steel of 500kNm as an example, a practical calculation method for calculating the length coefficient of an axial compression bar considering the influence of spring hinge constraints fixed at both ends includes the following steps:

[0143] Step 1, determine the rotational stiffness R of the bottom support of the axial compression rod a , the rotational stiffness R of the top support b : The rotational stiffness R of the bottom support is known from the initial conditions a is 4550kNm, the rotational stiffness R of the top support b 500kNm;

[0144] Step 2, the calculation step of the linear stiffness i of the axial compression rod: calculate the linear stiffness i of...

Embodiment 2

[0157] Taking the strength of Q420, the limb width of 220mm, the limb thickness of 20mm, the length of 2604mm, and the two ends of the high-strength large-scale angle steel constrained by the spring support, but the actual rotational stiffness of the support is not given, a consideration of two A practical calculation method for calculating the length coefficient of the axial compression bar affected by the constraint of the end-fixed spring hinge, including the following steps:

[0158] Step 1, determine the rotational stiffness R of the bottom support of the axial compression rod a , the rotational stiffness R of the top support b :

[0159] Step 1.1, arrange 8 strain gauges on the top and bottom side walls of the axial compression bar respectively to measure the strain distribution of the top and bottom sections of the axial compression bar; Two vertical displacement sensors are used to measure the vertical displacement of the top seat displacement measuring point corresp...

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Abstract

The invention relates to a practical method for calculating the length coefficient of a shaft pressure rod considering constraint influences of fixed spring hinges at the two ends. The method includesthe following steps of determining the rotation rigidity Ra of a bottom support and the rotation rigidity Rb of a top support of the shaft pressure rod, calculating the linear rigidity i of the shaftpressure rod, calculating the ratio ra of the rigidity of the bottom spring hinge to the rigidity of a pressure rod of the shaft pressure rod and the ratio rb of the rigidity of the top spring hingeto the rigidity of the pressure rod of the shaft pressure rod, and calculating the length coefficient of the shaft pressure rod considering constraint influences of the fixed spring hinges at the twoends according to a practical formula for calculating the length coefficient of the shaft pressure rod. The method has the advantages that the problem that an existing method for calculating the length coefficient micron of the shaft pressure rod is too simplified, so the limit bearing capacity of the shaft pressure rod is overestimated in engineering design or tests can be solved, the problem that the existing method can not directly calculate the length coefficient micron of the shaft pressure rod under designated support rigidity can be also solved, and meanwhile the method is simple in step, small in required parameter and high in precision.

Description

technical field [0001] The invention relates to the technical field of axial compression stability calculations, in particular to a practical calculation method for calculating the length coefficient of an axial compression bar considering the influence of the constraints of spring hinges fixed at both ends. Background technique [0002] The calculated length of members under axial compression is an important parameter for analyzing the overall stability of members under axial compression. Whether it is the Euler formula applicable to the ideal elastic axial compression bar, or the calculation formula in the form of Perry's formula adopted by many design codes, the actual calculation length of the axial compression bar must be obtained first, and then the ultimate stable bearing capacity of the axial compression bar can be accurately calculated. At the same time, for the axial compression stability test research, even if a single-knife hinge or a direct fixed support is used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/06
Inventor 郭耀杰陈颢元曹珂李旋
Owner WUHAN UNIV
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