Method for evaluating section curvature of variable-section column

Abstract

The method comprises the following steps: arranging a plurality of mark points at intervals on the center lines of cylindrical surfaces on two sides of a variable-cross-section column component, and dividing a measurement area; displacement sensors are arranged on left and right side column surfaces and front diagonal lines of the variable cross-section column; measuring the distance between the mark points of the measurement area, the length of the left and right side lines and the included angle between the left and right side lines and the bottom line, monitoring the length variation of the left and right sides of the measurement area, and calculating the length of two diagonal lines and the right included angle between the central axis and the bottom line before deformation of the measurement area by using the measured data; the included angle between the left diagonal line and the bottom edge line; calculating an intermediate parameter which is a parameter required for obtaining the curvature of the section of the measurement area after deformation; determining parameters required for obtaining the curvature of the section of the measurement area after deformation by using the intermediate parameters; calculating the section average curvature of the measurement area; establishing a numerical model, and calculating section curvature limit values entering different damage states; and finally, curvature evaluation is carried out.

Description

technical field [0001] The invention belongs to the technical fields of building construction, building structure research and the like, and in particular relates to a section curvature evaluation method of a variable section column. Background technique [0002] With the development of economy and science and technology, variable-section columns are widely used in building structures because they can take into account the different stress requirements of different positions, which are more in line with the overall stress characteristics, and have beautiful appearance and decorative effects. The variable section column is used in the light steel structure of high-rise or super high-rise steel structure, the box-shaped variable section is used in the side column and the middle column of the high-rise or super high-rise steel structure, and the variable section is used in the tower column of the main load-bearing member of the cable-stayed bridge. Especially the cable-stayed b...

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Problems solved by technology

[0011] It solves the problem that the existing cross-section average curvature measurement method suitable for equal cross-section straight / slanted columns is difficult to accurately install the displacement sensor when the cross-section average curvature measurement is applied to variable cross-section inclined columns, resulting in inaccurate measurement results. And the current calculation method of curvature does not take into account the small changes in the length of the central axis and the length of the bottom line after the deformation process, as well as the small changes in the angle between the left and right sides and the central axis, resulting in inaccurate calculation of section curvature

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