Round steel pipe concrete with negative Poisson's ratio effect and design method thereof

Abstract

The invention discloses round steel pipe concrete with a negative Poisson ratio effect and a design method of the round steel pipe concrete. The round steel pipe concrete comprises a round steel pipewith a negative Poisson ratio effect, a steel support with a negative Poisson ratio effect and concrete. The steel support is arranged on the inner wall of the round steel pipe. Concrete is filled inthe round steel pipe. The round steel pipe and the steel support are of hole structures which are alternately and periodically arranged in horizontal and vertical directions. The relationship betweenthe height L of the round steel pipe and the diameter D of the round steel pipe should comply with 2.5<L / D<5, the relationship between the thickness r of the round steel pipe and the diameter D of theround steel pipe should comply with 30<D / r<40, the height of the steel support is equal to L, and the width d of the steel support should comply with 0.6<d / D<0.7. The round steel pipe concrete can actively restrain the transverse deformation of core concrete, thereby improving the compressive bearing capacity and ductility of the structure. Meanwhile, the hole design of the negative Poisson ratiosteel pipe can improve the anti-seismic performance of the structure.

Description

technical field [0001] The invention relates to a circular concrete filled steel tube with negative Poisson's ratio effect by designing a three-dimensional negative Poisson's ratio hole structure, and also relates to a combined structure of steel and concrete, and proposes a negative Poisson's ratio circular concrete filled steel tube design method , belonging to the field of new materials and new structures. Background technique [0002] As the most common material in construction engineering, concrete has a long history. Due to the existence of initial defects in concrete, when it is compressed axially, the concrete begins to expand laterally, making the cracks continue to develop until they connect to the failure surface. Although concrete filled steel pipes can restrain the radial expansion of concrete when the Poisson's ratio of the concrete is greater than that of the steel pipe, when the pressure begins to be applied, the Poisson's ratio of the concrete is smaller th...

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Problems solved by technology

Although concrete filled steel pipes can restrain the radial expansion of concrete when the Poisson's ratio of the concrete is greater than that of the steel pipe, when the pressure begins to be applied, the Poisson's ratio of the concrete is smaller than the Poisson's ratio of the steel pipe, and the radial deformation of the steel pipe is greater than the diameter of the concrete. direction deformation, the steel pipe does not restrain the concrete

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