Method for calculating flexural rigidity of externally-wrapped corrugated side plate-concrete composite beam

Abstract

The invention discloses a method for calculating the flexural rigidity of an externally-wrapped corrugated side plate-concrete composite beam. By means of the method, the flexural rigidity of the externally-wrapped corrugated side plate-concrete composite beam can be rapidly calculated. The method comprises the steps that the thickness and width of a steel top plate and a steel bottom plate of anexternally-wrapped corrugated side plate-concrete composite beam, the wave height of a corrugated side plate, the height and width of a beam section, the height and width of a concrete floor and the elasticity modulus of concrete and steel are obtained; according to elastic analysis, the average value of the widths of the wave crests and the widths of the wave troughs of the corrugated steel plateis obtained according to the effective section width of concrete in the corrugated steel plate; the section of the composite beam is converted into the section of the steel beam by adopting a section conversion method to calculate the equivalent section neutralization axis of the composite beam; and the centroid of the section of the steel beam is obtained through conversion of the elastic neutralization axis of the composite beam, the distance x between the centroid of the section of the steel beam and the topmost end of the section is calculated, moment taking is conducted on the neutralization axis through concrete and a steel component, and the flexural rigidity is calculated through the moment taking result.

Description

technical field [0001] The invention relates to a method for calculating the bending stiffness of an outsourcing corrugated side plate-concrete composite beam, belonging to the technical field of composite beam structures. Background technique [0002] With the progress of the times and the development of the economy, ordinary reinforced concrete beams can no longer meet the design requirements of high-rise structures and long-span structures. Therefore, composite structures have attracted everyone's attention and are constantly used in modern architectural design. Although steel-concrete composite beams have obvious application advantages, there are still many problems in their own stress, such as slippage between concrete and steel, and insufficient longitudinal shear resistance of concrete. In order to improve the deficiencies of ordinary composite beams, outsourcing steel-concrete composite beams came into being. Outsourcing steel-concrete composite beam refers to a new...

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Problems solved by technology

"Code for Design of Composite Structures" and Professor Nie Jianguo of Tsinghua University have adopted the reduced stiffness method considering the slip effect to reduce the calculated stiffness to take into account the slip effect and other unfavorable factors, but for the corrugated side slab concrete As far as the composite beam is concerned, there is almost no slippage, and the calculation formula using the reduced stiffness method is too complicated, so it is necessary to find a new calculation method to calculate the bending stiffness of the concrete composite beam with corrugated side slabs

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