Blanking size control method for variable cross-section corrugated steel web box girder web

Abstract

The invention discloses a blanking size control method for a variable cross-section corrugated steel web box girder web. The method comprises the following steps of 1, dividing key cross sections of avariable cross-section corrugated steel web box girder; 2, acquiring the pre-camber of each key section of the variable cross-section corrugated steel web box girder; 3, obtaining the theoretical elevation of the bridge floor at each key section corrugated steel web of the variable-section corrugated steel web box girder; 4, obtaining coordinates of each intersection point of each corrugated steel web section; and 5, determining the blanking size of each corrugated steel web section. According to the invention, the blanking size of the corrugated steel web material is calculated; the pre-camber of a bridge structure is considered; the structural line shape of the main beam in an operation state is fully guaranteed; according to the length increment of the unfolded corrugated steel web perunit wavelength, the coordinates of all intersection points after the corrugated steel web is unfolded are obtained, the coordinates of all control points after the corrugated steel web is unfolded are derived, the discharging size of the unfolded corrugated steel web sections is determined, the calculation result accuracy is high, and the due structural characteristics of the corrugated steel web sections are brought into play.

Description

technical field [0001] The invention belongs to the technical field of blanking size control of a corrugated steel web box girder web, and in particular relates to a method for controlling the blanking size of a corrugated steel web box girder web blanking size. Background technique [0002] Prestressed concrete PC box girder is a commonly used structural form of modern long-span bridges. Box girders generally need to arrange prestressed steel bars on the top, bottom and web to improve their bending and shear bearing capacity, so their sections are relatively thick. As the span increases, its self-weight also increases rapidly, which affects the spanning ability and economy, and increases the burden on the substructure. At the same time, the structural web mainly bears the shear force, and the stress problems caused by the temperature difference between the top and bottom plates and the drying shrinkage of the web are more prominent, and the web is prone to more cracks, whic...

AI Technical Summary

Problems solved by technology

[0004]However, the blanking size of the corrugated steel web material is not accurate, which will inevitably affect the size of the corrugated steel web

The corrugated steel web parts with inappropriate size will also affect its normal installation during construction, and the size error is large or even impossible to install; it will also affect its own deformation in the operating state, and then deviate from the normal design state, affecting Stress and safety of bridge structure as a whole

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