Casing pipe bending induction support provided with circumferential trapezoid induction units

Abstract

The invention discloses a casing pipe bending induction support provided with circumferential trapezoid induction units. The casing pipe bending induction support consists of an end restraint section, a bending induction section, an inner casing pipe and an outer casing pipe, wherein the bending induction section is clamped between the inner casing pipe and the outer casing pipe, the inner casing pipe and the outer casing pipe are respectively connected with one end restraint section, and the bending induction section consists of at least one circumferential trapezoid induction unit in the axis direction of the support. The single circumferential trapezoid induction unit is a space body with a polygonal cross section formed by sequentially arranging m same circumferential trapezoid sub-units in the circumferential direction, and the circumferential trapezoid sub-units are space bodies formed by folding four isosceles trapezoidal plates located in a plane. The casing pipe bending induction support retains elasticity under a small shock effect, is at a yielding state under a medium or large shock effect, and the good hysteresis energy dissipation capacity can also play the effect of a damper. The casing pipe bending induction support can be prefabricated in a factory, the working amount of site construction operation is decreased, and the casing pipe bending induction support saves energy and is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of building structures, and in particular relates to a casing buckling induction support with a circular trapezoidal induction unit, which is suitable for steel structures or concrete structures with buckling restraint supports. Background technique [0002] During the use of steel structures or reinforced concrete structures, ordinary supports will buckle under compression. When the supports buckle under compression, the stiffness and bearing capacity will decrease sharply. Under the action of earthquake or wind, the internal force of the support changes back and forth under the two states of compression and tension. When the support gradually changes from the buckling state to the tension state, the internal force and stiffness of the support are close to zero. Therefore, the hysteretic performance of ordinary supports is poor under repeated loads. In order to solve the problem of buckling under compress...

AI Technical Summary

Problems solved by technology

On June 1, 2016, the applicant proposed a casing-constrained buckling-resistant brace with symmetrical initial defects (application number 201610383428.8) and a casing-constrained buckling-resistant brace with diamond-shaped energy dissipation units (application number 201610383133.0) has a fixed geometry and little design flexibility

Moreover, the thickness and structure of the energy-dissipating unit at the crease in the above support are the same as those at the non-crease, which is not conducive to the generation of plastic hinges at the crease.

In addition, these supports are composed of end restraint segments, buckling segments, and sleeves. The sleeves are on the outside of the buckling segment, and there is no support on the inside of the buckling segment, which is prone to low-order instability toward the inside, thereby weakening the energy dissipation capacity of the support.

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