CN111236725B

CN111236725B - Removable picture peg formula energy dissipation column base structure

Info

Publication number: CN111236725B
Application number: CN202010072594.2A
Authority: CN
Inventors: 李国强; 汪绍洋; 孙飞飞; 金华建; 王彦博
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2020-01-21
Filing date: 2020-01-21
Publication date: 2021-06-08
Anticipated expiration: 2040-01-21
Also published as: CN111236725A

Abstract

The invention belongs to the technical field of constructional engineering earthquake resistance, and provides a steel column base with replaceable insert plate type energy dissipation, which comprises a concrete foundation, a foundation embedded part, an anchor rod, a column bottom casting, a lower bottom plate, a base plate, an energy dissipation plate, an upper bottom plate, stiffening ribs and a steel column. Through the mode that sets up bayonet power consumption board, provided one kind and had certain bearing capacity, rigidity and power consumption ability, and the power consumption board is easily changed picture peg formula column base. Under a slight shock, all the components of the invention are in an elastic state. Under the condition of medium or large earthquake, only the energy dissipation plate enters the plasticity to dissipate energy, and the rest parts are in an elastic state. After medium or large earthquake, the column base can be quickly repaired by replacing the energy consumption plate, so that the column base can be repeatedly utilized.

Description

Removable picture peg formula energy dissipation column base structure

Technical Field

The invention belongs to the technical field of constructional engineering earthquake resistance, and particularly relates to a replaceable inserting plate type energy dissipation steel column base.

Background

With the rapid development of production technology and welding technology, Q460 and Q690 high strength steels are widely used in engineering structures due to their advantages in building style, structural safety, economic benefits, etc.

These engineering structures face new problems in the design of the column shoe when high strength steel columns are used.

If the column base adopts a hinged column base, the lateral movement resisting rigidity of the whole structure is obviously reduced, and the column base part of the structure can not well dissipate seismic energy.

If the column base adopts the traditional rigid connection column base, the column base joint can be subjected to large bending moment when the earthquake occurs, so that the section of the column is subjected to yielding. The column section undergoes large plastic deformation, resulting in a structure that is not suitable for continued load bearing. Such plastic deformation also presents difficulties in repair reinforcement.

Disclosure of Invention

In view of the above, the main objective of the present invention is to provide a replaceable insert plate type energy dissipation column base structure.

The technical scheme of the invention is as follows:

a replaceable insert plate type energy dissipation column base comprises a foundation 1, a spherical casting 4, a steel pipe with holes 3, a steel plate with holes 2, an anchor rod 6, a lower bottom plate 9, a backing plate 15, an energy dissipation plate 10, an upper bottom plate 11, stiffening ribs 12 and a steel column 13;

the lower bottom plate 9 is provided with a notch and a round hole, the notch is used for embedding the protruding part of the stiffening rib 12, and the round hole is used for exposing the energy consumption plate 10;

the backing plate 15 is positioned between the lower bottom plate 9 and the upper bottom plate 11 and is spot-welded with the lower bottom plate 9;

the energy dissipation plate 10 is provided with a notch, so that subsequent repeated installation is facilitated without being influenced by the anchor rod 6, and corners at the end part are cut off so as to facilitate installation;

the upper bottom plate 11 is provided with a notch and a round hole, the notch is used for embedding the protruding part of the stiffening rib 12, and the round hole is used for exposing the energy consumption plate 10 and is welded with the steel column 13;

the convex part of the stiffening rib 12 is inserted into the notches of the upper and lower bottom plates and is welded with the upper and lower bottom plates, and the other end is welded with the steel column;

the anchor rod 6 is used for connecting the foundation 1 and the energy consumption plate 10;

when the anchor rod 6 is connected with the energy dissipation plate 10, the cushion blocks 14 are arranged above and below the energy dissipation plate 10, so that the nuts are prevented from being extruded when the energy dissipation plate 10 deforms greatly when the anchor rod 6 is pulled or pressed;

the lower part of the lower bottom plate 9 is meshed with the spherical casting 4 through the column bottom casting 8 to ensure that the column bottom part can freely rotate;

a pit 7 is arranged in the center of the column bottom casting 8, and a bulge 5 is arranged in the center of the spherical casting 4, so that the column bottom is convenient to align when being installed;

a steel pipe with holes 3 and a steel plate with holes 2 are welded under the spherical casting 4 and are embedded in the foundation 1;

the steel pipe 3 with holes and the steel plate 2 with holes are provided with holes, so that concrete can be better poured into the steel pipe 3 when the foundation is poured;

the working principle of the invention is as follows: a replaceable inserting plate type energy dissipation column base structure is characterized in that a lower bottom plate 9, an upper bottom plate 11 and a steel column 13 are connected with stiffening ribs 12 in a welding mode to form a whole. The steel column 13 transfers the load to the column foot upper base plate 11. The axial force and the shearing force are transmitted to the foundation 1 through the column bottom casting 8, the spherical casting 4, the steel pipe with holes 3 and the steel plate with holes 2. The bending moment is transmitted to the anchor rod 6 through the energy consumption plate 10 and then transmitted to the foundation 1 through the anchor rod 6. Under the action of small vibration, all the components are in elasticity; under the conditions of medium and large earthquakes, only the exposed part of the energy dissipation component enters plastic energy dissipation under the extrusion of the cushion block 14. After an earthquake, the anchor bolt nut and the cushion block 14 are detached, then the part of the energy dissipation plate 10 with larger deformation is cut off by a cutting gun, then the energy dissipation plate can be pulled out, a new energy dissipation plate 10 is inserted again, and the cushion block 14 and the nut are installed, so that the column base can be reused.

The invention provides a new and different column base structure form in the prior art. High-strength steel is widely used due to advantages in aspects of architectural style, structural safety, economic benefits and the like, but high-strength steel has the disadvantage of poor ductility. Designers therefore do not want the traditional rigid-joint column base to allow the high-strength steel column to enter yielding, nor do they want the hinged column base to have poor energy-consuming capability and provide a structure with low lateral stiffness. At present, no column base form can better solve the problem in the market. The new column base can ensure that the section of the column bottom is always in elasticity, has certain bearing capacity, rigidity and energy consumption capacity, and additionally has the characteristic of easy repair. Can solve the problems faced by designers at present and is worth popularizing and applying.

Drawings

FIG. 1 is a schematic view of a replaceable insert plate type energy dissipation column base structure in one embodiment of the present invention

FIG. 2 is a schematic cross-sectional view of an example of a replaceable insert plate type energy dissipation column base

FIG. 3 is a schematic view of the arrangement of anchor rods and embedment members in one embodiment of the present invention

FIG. 4 is a perspective view of an upper plate and a lower plate according to an embodiment of the present invention

FIG. 5 is a perspective view of a lower plate according to an embodiment of the present invention

FIG. 6 is a perspective view of a backing plate according to an embodiment of the present invention

FIG. 7 is a perspective view of an energy dissipation plate according to an embodiment of the present invention

FIG. 8 is a schematic view of a stiffener according to an embodiment of the present invention

FIG. 9 is a schematic perspective view of a basic embedded part according to an embodiment of the present invention

In the figure: 1, a foundation; 2, a steel plate with holes; 3, a steel pipe with holes; 4, spherical casting; 5, protruding; 6, anchoring the bolt; 7, pits; 8 column bottom castings; 9, a lower bottom plate; 10 energy dissipation plates; 11, an upper bottom plate; 12 a stiffener; 13 steel columns; 14 cushion blocks; 15 backing plates.

Detailed Description

The following description of an embodiment of the present invention is provided with reference to the accompanying drawings:

as shown in fig. 7, first, a basic embedded part is manufactured, and a perforated steel plate 2, a perforated steel pipe 3, a spherical casting 4 and a protrusion 5 which are prefabricated in a factory are welded.

As shown in fig. 2 and 3, an anchor bolt 6 and a foundation embedded part are installed and fixed before the foundation 1 is poured, and the foundation 1 is poured and sufficiently vibrated to allow concrete to be poured into the embedded part.

As shown in fig. 1, 4, 5, 6, and 7, after the base strength reaches 75%, the column shoe upper member is assembled in the following order:

the factory firstly manufactures various plate members according to the requirements of drawings. In a factory, a base plate is firstly spot-welded at the center of a lower bottom plate 9, an energy consumption plate 10 is arranged at a corresponding position, and an upper bottom plate 11 is covered; inserting stiffening ribs 12 into corresponding notches of the upper bottom plate and the lower bottom plate, welding the stiffening ribs 12 above the upper bottom plate 11, and welding the stiffening ribs 12 below the lower bottom plate 9 to enable the upper bottom plate and the lower bottom plate and the stiffening ribs 12 to form a whole; inserting a steel column 12, welding an upper base plate 11 and the steel column 13, and welding a stiffening rib 12 and the steel column 13 to enable a lower base plate 9, the upper base plate 11, the stiffening rib 12 and the steel column 13 to be an integral body; welding an upper column bottom casting 8 at the center of the lower part of the lower bottom plate 9; and drawing the energy dissipation plate 10 out after the welding line is cooled.

And (4) transporting the steel columns with the bottom plates, which are prepared in factories, to the site for installation. A nut, a washer and a cushion block 14 are sleeved on the anchor rod 6; lifting and mounting the steel column, so that the bottom casting 8 and the spherical casting 5 are vertically and accurately aligned, and the round hole in the lower bottom plate 9 is aligned with the corresponding anchor rod 6; inserting the energy consumption plate 10; installing a cushion block 14, a washer and a nut above the energy consumption plate 10; adjusting nuts above and below the energy consumption plate 10 to enable the energy consumption plate to be tightly propped against the energy consumption plate; and removing the lifting device, and finishing the installation of the column base.

Claims

1. A replaceable insert plate type energy dissipation column base is characterized by comprising a foundation (1), a spherical casting (4), a steel pipe (3) with holes, a steel plate (2) with holes, an anchor rod (6), a lower bottom plate (9), a backing plate (15), an energy dissipation plate (10), an upper bottom plate (11), stiffening ribs (12) and a steel column (13);

the lower bottom plate (9) is provided with a notch and a round hole, the notch is used for embedding the protruding part of the stiffening rib (12), and the round hole is used for exposing the energy consumption plate (10);

the backing plate (15) is positioned between the lower bottom plate (9) and the upper bottom plate (11) and is in spot welding with the lower bottom plate (9);

the energy dissipation plate (10) is provided with a notch, so that subsequent repeated installation is facilitated without being influenced by the anchor rod (6), and corners at the end part are cut off so as to facilitate installation;

the upper bottom plate (11) is provided with a notch and a round hole, the notch is used for embedding the protruding part of the stiffening rib (12), and the round hole is used for exposing the energy consumption plate (10) and is welded with the steel column (13);

the convex part of the stiffening rib (12) is inserted into the notches of the upper and lower bottom plates and is welded with the upper and lower bottom plates, and the other end of the stiffening rib is welded with the steel column;

the anchor rods (6) are used for connecting the foundation (1) and the energy consumption plates (10);

a bulge (5) is arranged in the center of the curved surface of the spherical casting (4), so that the steel column is vertically centered conveniently; the spherical casting (4) is in butt welding with the steel pipe (3) with the hole;

the steel pipe (3) with the hole is welded with the steel plate (2) with the hole;

holes are formed in the pipe wall of the steel pipe (3) with the holes, so that concrete can be better poured into the steel pipe when the foundation is poured;

the center of the steel plate (2) with the holes is provided with the holes, so that concrete can be better poured into the steel pipe when the foundation is poured.

2. The column shoe according to claim 1, characterized in that the lower floor (9), the upper floor (11) and the steel column (13) are integrally formed by welding with the stiffening ribs (12).

3. Column shoe according to claim 1, characterized in that a column bottom casting (8) is welded under the lower base plate (9).

4. Column shoe according to claim 3, characterized in that the concave spherical curvature of the column bottom casting (8) is identical to the curvature of the spherical casting (4) in order to facilitate the free rotation of the column bottom.

5. Column shoe according to claim 3, characterized in that the concave spherical surface of the column bottom casting (8) is provided with a recess (7) in the center to facilitate vertical centering of the steel column.