CN105926795A

CN105926795A - Casing pipe constraint buckling prevention support with symmetrical initial defects

Info

Publication number: CN105926795A
Application number: CN201610383428.8A
Authority: CN
Inventors: 蔡建国; 周宇航; 柳杨青; 冯健; 章玉婷
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2016-06-01
Filing date: 2016-06-01
Publication date: 2016-09-07
Anticipated expiration: 2036-06-01
Also published as: CN105926795B

Abstract

The invention discloses a casing pipe constraint buckling prevention support with symmetrical initial defects. The casing pipe constraint buckling prevention support with the symmetrical initial defects is characterized by being composed of end portion constraint sections, buckling sections and a casing pipe; and the two ends are connected with beam and column members or nodes to form a whole through bolts, so that the purpose of increasing the lateral rigidity resistance of the members is achieved. The casing pipe constraint buckling prevention support with the symmetrical initial defects keeps elasticity under the small earthquake effect, the buckling sections enter the buckling stage under the medium earthquake or major earthquake effect, and the good hysteretic dissipative energy can also achieve the effect of a damper. The casing pipe constraint buckling prevention support with the symmetrical initial defects can be prefabricated in a factory, the quality of the members is ensured, the workload of on-site construction work is reduced, and energy conservation and environmental protection are achieved.

Description

A kind of sleeve pipe constraining anti-buckling with symmetrical initial imperfection supports

Technical field

The invention belongs to building structure technology field, particularly relate to a kind of sleeve pipe constraining anti-buckling with symmetrical initial imperfection and support, it is adaptable to the steel construction of band buckling restrained brace or xoncrete structure.

Background technology

During steel construction or reinforced concrete structure use, common support pressurized can produce flexing phenomenon, and after supporting compressive buckling, rigidity and bearing capacity drastically reduce.Under earthquake or wind action, the internal force of support back and forth changes under pressurized and tension two states.When support is gradually faded to tension state by the state of buckling, internal force and the rigidity of support are close to zero.Thus common support Hysteresis Behavior under course under cyclic loading is poor.For solving common support compressive buckling and the problem of Hysteresis Behavior difference, supporting outside, sleeve pipe is set, the compressive buckling that constraint supports, constitute buckling-restrained buckling restrained brace only central layer to be connected with other components, suffered load is all undertaken by central layer, and outer sleeve and packing material only retrain central layer compressive buckling, makes central layer in tension and surrendered by equal can the entrance of pressure, thus, the Hysteresis Behavior of buckling restrained brace is excellent.On the one hand buckling restrained brace can avoid the defect of common support tension and compression bearing capacity significant difference, on the other hand has the energy dissipation capacity of metal damper, can serve as " fuse " in the structure so that agent structure is substantially in elastic range.Therefore, the application of buckling restrained brace, can improve traditional support frame anti-seismic performance under middle shake and big shake comprehensively.

Summary of the invention

Goal of the invention: owing to existing constraining anti-buckling is supported under course under cyclic loading, the component or the joints that are connected with buckling restrained brace are bigger；For the problem overcoming prior art to exist, the present invention is introduced into symmetrical initial imperfection to traditional common support, forms a kind of sleeve pipe constraining anti-buckling with symmetrical initial imperfection and supports, prioritizing selection when being to select constraining anti-buckling support in engineering structure.

Technical scheme: for achieving the above object, the technical solution used in the present invention is:

nullA kind of sleeve pipe constraining anti-buckling with symmetrical initial imperfection supports，By end restraint section、Flexing section and sleeve pipe composition，Described end restraint section is positioned at the two ends of described flexing section，Described casing pipe sleeve is in described flexing section，It is characterized in that: described flexing section is made up of along the axis direction supported at least one Typical symmetrical initial imperfection unit，Described single Typical symmetrical initial imperfection unit is made up of two identical initial imperfection unit，Described initial imperfection unit is made up of through folding the space body formed four identical parallelogram plates in the same plane，Described four parallelogram plate conllinear two-by-two also intersect at a summit，According to being respectively parallelogram plate one counterclockwise、Parallelogram plate two、Parallelogram plate three and parallelogram plate four，Wherein parallelogram plate one and the common edge of parallelogram plate two、The common edge of parallelogram plate two and the common edge of parallelogram plate three and parallelogram plate three and parallelogram plate four is crest line，The common edge of parallelogram plate one and parallelogram plate four is valley line，Adjacent parallelogram plate is folded-out along crest line，Along valley line fold inward，Until the four of parallelogram plate free margins are on same level，Angle between the described folded-out exterior normal referring to adjacent parallelogram plate becomes big，Fold inward refers to that the angle between the exterior normal of adjacent parallelogram plate diminishes；Described sleeve pipe is fixed on outside flexing section by grout filling concrete.

Described end restraint section is made up of the connecting plate that the components such as square plate, T-shaped short girder steel and beam column are reserved, square plate is welded on flexing section end, two T-shaped short girder steels are welded to connect with square plate, connecting plate is clipped in the middle of two T-shaped short girder steels (5), and connecting plate is connected with T-shaped short girder steel high-strength bolt.

Described sleeve pipe is made up of the hollow steel pipe of square-section.

Two identical initial imperfection unit in described single Typical symmetrical initial imperfection unit are about the plane symmetry of four free margins formation of quadrangular plate.

Described four identical parallelogram plates can not be rectangle.

Beneficial effect:

A kind of sleeve pipe constraining anti-buckling with symmetrical initial imperfection of the present invention supports, and is made up of end restraint section, flexing section and sleeve pipe.Use the sleeve pipe constraining anti-buckling with symmetrical initial imperfection to support, owing to tension and compression unbalance factor is less, be conducive to protecting component or the bean column nodes such as beam column under geological process.Flexing section is made up of multiple Typical symmetrical initial imperfection unit, Typical symmetrical initial imperfection unit is by the folding line formed by crest line and valley line pre-set, make to be supported under geological process, at the folding line pre-set, bigger strain can occur thus form yield line, reach the purpose of dissipation seismic energy.The present invention can have only to scene be connected with the built-in fitting of the components such as bolt and beam column, both ensure that component quality, reduced again on-the-spot wet trade workload, energy-conserving and environment-protective in factory process.The sleeve pipe constraining anti-buckling with symmetrical initial imperfection supports the flexible arrangement both with the anti-buckling support of general restriction, more effectively can be dissipated the advantages such as seismic energy, the component that is connected with buckling restrained brace or the problem such as joints is bigger can be solved again, there is good Popularizing of A.

Accompanying drawing explanation

Fig. 1 is the structural representation of the present invention；

Fig. 2 is end restraint section schematic diagram；

Fig. 3 is flexing section schematic diagram；

Fig. 4 is sleeve pipe schematic diagram；

Fig. 5 is square plate schematic diagram；

Fig. 6 is T-shaped short girder steel schematic diagram；

Fig. 7 is connecting plate schematic diagram；

Fig. 8 is Typical symmetrical initial imperfection cell schematics；

Fig. 9 is initial imperfection cell schematics；

Figure 10 is that initial imperfection unit folds frontal plane schematic diagram.

Detailed description of the invention

Below in conjunction with the accompanying drawings the present invention is further described.

Fig. 1 is the structural representation of the present invention, is made up of end restraint section 1, flexing section 2 and sleeve pipe 3.End restraint section 1 is fixed between bean column node and flexing section 2, and sleeve pipe 3 is fixed on outside flexing section 2 by grouted-aggregate concrete material.

As shown in Figure 2, end restraint section 1 is made up of the connecting plate 6 that the components such as square plate 4, T-shaped short girder steel 5 and beam column are reserved, square plate 4 is welded on flexing section 2 end, and two T-shaped short girder steels 5 are welded to connect with square plate 4, square plate 4 and T-shaped short girder steel 5 respectively such as Fig. 5, shown in 6.Connecting plate 6 is clipped in the middle of two T-shaped short girder steels 5, and connecting plate 6 is connected with high-strength bolt with T-shaped short girder steel 5, and wherein connecting plate 6 is as shown in Figure 7.

According to Fig. 3, flexing section 2 is made up of along the axis direction supported 13 Typical symmetrical initial imperfection unit 7.In Fig. 8, single Typical symmetrical initial imperfection unit 7 is made up of two identical initial imperfection unit 8.Wherein initial imperfection unit 8 is made up of, as shown in Figure 9 through folding the space body formed four identical parallelogram plates in the same plane；Figure 10 is that initial imperfection unit folds frontal plane schematic diagram, four parallelogram plate conllinear two-by-two also intersect at a summit, according to being respectively parallelogram plate 1 counterclockwise, parallelogram plate 2 10, parallelogram plate 3 11 and parallelogram plate 4 12, wherein parallelogram plate 1 and the common edge of parallelogram plate 2 10, the common edge of parallelogram plate 2 10 and the common edge of parallelogram plate 3 11 and parallelogram plate 3 11 and parallelogram plate 4 12 is crest line 13, the common edge of parallelogram plate 1 and parallelogram plate 4 12 is valley line 14.In four identical parallelogram plate folding processes, adjacent parallelogram plate is folded-out along crest line 13, along valley line 14 fold inward, until the four of parallelogram plate free margins 15 are on same level.Four identical parallelogram plates can not be rectangle.Angle between the folded-out exterior normal referring to adjacent parallelogram plate becomes big, and fold inward refers to that the angle between the exterior normal of adjacent parallelogram plate diminishes.Two identical initial imperfection unit 8 in single Typical symmetrical initial imperfection unit 7 are about the plane symmetry of four free margins 15 formation of quadrangular plate.

As shown in Figure 4, sleeve pipe 3 is made up of the hollow steel pipe 16 of square-section.Hollow steel pipe is enclosed within outside flexing section 2, makes hollow steel pipe 16 be connected integral with flexing section 2 by grout filling concrete material.

Claims

null1. a sleeve pipe constraining anti-buckling with symmetrical initial imperfection supports，By end restraint section (1)、Flexing section (2) and sleeve pipe (3) composition，Described end restraint section (1) is positioned at the two ends of described flexing section，Described casing pipe sleeve is in described flexing section，It is characterized in that: described flexing section (1) is made up of along the axis direction supported at least one Typical symmetrical initial imperfection unit (7)，Described single Typical symmetrical initial imperfection unit (7) is made up of two identical initial imperfection unit (8)，Described initial imperfection unit (8) is made up of through folding the space body formed four identical parallelogram plates in the same plane，Described four parallelogram plate conllinear two-by-two also intersect at a summit，According to being respectively parallelogram plate one (9) counterclockwise、Parallelogram plate two (10)、Parallelogram plate three (11) and parallelogram plate four (12)，Wherein parallelogram plate one (9) and the common edge of parallelogram plate two (10)、The common edge of parallelogram plate two (10) and the common edge of parallelogram plate three (11) and parallelogram plate three (11) and parallelogram plate four (12) is crest line (13)，The common edge of parallelogram plate one (9) and parallelogram plate four (12) is valley line (14)，Adjacent parallelogram plate is folded-out along crest line (13)，Along valley line (14) fold inward，Until the four of parallelogram plate free margins (15) are on same level，Angle between the described folded-out exterior normal referring to adjacent parallelogram plate becomes big，Fold inward refers to that the angle between the exterior normal of adjacent parallelogram plate diminishes；Described sleeve pipe (3) is fixed on flexing section (2) outside by grout filling concrete.
The sleeve pipe constraining anti-buckling with symmetrical initial imperfection the most according to claim 1 supports, it is characterized in that: described end restraint section (1) is made up of the connecting plate (6) that the components such as square plate (4), T-shaped short girder steel (5) and beam column are reserved, square plate (4) is welded on flexing section (2) end, two T-shaped short girder steels (5) are welded to connect with square plate (4), connecting plate (6) is clipped in the middle of two T-shaped short girder steels (5), and connecting plate (6) is connected with high-strength bolt with T-shaped short girder steel (5).
The sleeve pipe constraining anti-buckling with symmetrical initial imperfection the most according to claim 1 supports, it is characterised in that: described sleeve pipe (3) is made up of the hollow steel pipe (16) of square-section.
The sleeve pipe constraining anti-buckling with symmetrical initial imperfection the most according to claim 1 supports, it is characterised in that: the plane symmetry that two identical initial imperfection unit (8) in described single Typical symmetrical initial imperfection unit (7) are formed about four free margins (15) of quadrangular plate.
The sleeve pipe constraining anti-buckling with symmetrical initial imperfection the most according to claim 1 supports, it is characterised in that: described four identical parallelogram plates are non-rectangle.