Box-shaped steel column foot with easily-replaced energy-consuming component

Abstract

The box-shaped steel column base comprises a bottom plate (1), a box-shaped column (2), a column bottom plate (3), an arc-shaped energy consumption plate (4), an upper connecting piece (5), a lower connecting piece (6) and bolts (7). The bottom of the box-shaped column (2) is fixedly connected to the column bottom plate (3); the upper connecting pieces (5) are arranged on the four side faces of the box-shaped steel column (2). The lower connecting pieces (6) are arranged on the periphery of the bottom of the box-shaped steel column (2) and fixed to the bottom plate (1). The arc-shaped energy consumption plates (4) are arranged on the four side faces of the box-shaped steel column (2) in groups and connected with the upper connecting piece (5) and the lower connecting piece (6) through bolts (7). Damage after an earthquake is only concentrated on the arc-shaped energy consumption plate, other parts are always kept elastic, and the post-earthquake repair cost of the column foot can be greatly reduced.

Description

Technical Field

[0001] The invention relates to the field of energy dissipation and shock absorption in civil engineering, and in particular to a box-shaped steel column foot with easily replaceable energy-consuming components. Background Art

[0002] As the main load-bearing component of steel frame structure, box-shaped steel columns are widely used in construction projects. Under earthquake action, box-shaped steel columns dissipate earthquake input energy by forming plastic hinges at the column base, which will also lead to obvious residual plastic deformation and serious damage at the column base after the earthquake. In addition, the damaged column base is usually integrated with the upper structure, which brings great difficulties to the post-earthquake repair work of the column base.

[0003] In order to improve the post-earthquake recovery capacity of the box-shaped steel column base, some scholars have proposed a box-shaped steel column base with replaceable energy-absorbing components, which aims to separate the energy-absorbing components from the main components of the column base, so that the post-earthquake damage of the column base is concentrated on the replaceable energy-absorbing components, while the main body of the steel column remains intact. However, the existing box-shaped steel column base still has the following shortcomings:

[0004] 1. Steel column bases can usually only bear unidirectional lateral loads and cannot bear bidirectional earthquake effects;

[0005] 2. The replaceable energy-absorbing parts of the steel column base are usually shear / bending energy-absorbing plates or buckling-restrained steel plates / steel bars. The arranged shear / bending energy-absorbing plates usually occupy a large building space, affecting the building effect. The arranged buckling-restrained steel plates / steel bars mainly bear the axial load, and under the action of an earthquake, the swaying of the steel column around the bottom of the column base can easily cause non-ideal bending damage at the connection of the buckling-restrained steel plates / steel bars, thereby reducing the stability of the hysteretic performance of the column base. In addition, the buckling-restrained steel plates / steel bars require additional lateral restraint components to ensure hysteresis characteristics similar to those in tension and compression, but this also brings difficulties to the detection of damaged components at the column base after the earthquake. Summary of the invention

[0006] Based on the problems existing in the existing box-shaped steel column base, the present invention proposes a box-shaped steel column base with easily replaceable energy-consuming parts.

[0007] In order to solve the above technical problems, the present invention provides a box-shaped steel column base with easily replaceable energy-absorbing components, comprising a base plate (1), a box-shaped column (2), a column base plate (3), an arc-shaped energy-absorbing plate (4), an upper connecting member (5), a lower connecting member (6) and bolts (7);

[0008] The bottom of the box-shaped column (2) is fixedly connected to the column bottom plate (3); the upper connecting member (5) is arranged on the four sides of the box-shaped steel column (2); the lower connecting member (6) is arranged around the bottom of the box-shaped steel column (2) and fixed to the bottom plate (1); the arc-shaped energy-absorbing plates (4) are arranged in groups on the four sides of the box-shaped steel column (2) and are connected to the upper connecting member (5) and the lower connecting member (6) by bolts (7).

[0009] In a preferred embodiment: the box-shaped column (2) is a steel column with a rectangular or square cross-section, and the steel column is welded from four steel plates, or the steel column is hot-rolled from one steel plate.

[0010] In a preferred embodiment: the column bottom plate (3) is provided with a first arc chamfer around its periphery.

[0011] In a preferred embodiment, the arc-shaped energy-absorbing plates (4) are cut from steel plates, and circular holes are opened at both ends of the arc-shaped energy-absorbing plates (4); each group of arc-shaped energy-absorbing plates (4) consists of two pieces, so that the arc-shaped energy-absorbing plates (4) arranged in the same plane are in an X shape.

[0012] In a preferred embodiment, a certain gap is left between the two arc-shaped energy-absorbing plates (4) arranged in an X shape.

[0013] In a preferred embodiment: the upper connecting member (5) is Z-shaped, and a triangular stiffening plate is welded to the portion welded to the box-shaped column (2), and a circular hole is opened to the portion where the upper connecting member (5) is connected to the arc-shaped energy-absorbing plate (4) by bolts (7).

[0014] In a preferred embodiment: the lower connecting member (6) is L-shaped, and a second arc chamfer is formed on the side in contact with the bottom plate (1), and a portion of the length of the two ends of the arc chamfer is cut off; a circular hole is formed on the part connected to the arc-shaped energy-absorbing plate (4).

[0015] In a preferred embodiment, there is a certain gap between the first circular arc chamfer of the column base plate (3) and the second circular arc chamfer of the lower connecting member (6).

[0016] In a preferred embodiment, the steel plate welded between the lower connecting member (6) and the base plate (1) serves to horizontally limit the column base plate (3).

[0017] In a preferred embodiment: no pre-tightening force is required to be applied to the bolts (7) between the arc-shaped energy dissipation plate (4) and the upper connecting member (5) and the lower connecting member (6).

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a box-shaped steel column base with easily replaceable energy-consuming parts. By arranging arc-shaped energy-consuming plates parallel to various surfaces of the box-shaped column, a small space is occupied, and the influence on the building effect can be effectively reduced.

[0020] The present invention provides a box-shaped steel column base with easily replaceable energy-consuming parts. Various parts of the column base are fixedly connected by welding. The welding work is completed in the factory, and the welding quality can be guaranteed. At the construction site, the assembly work of the column base can be efficiently completed only by connecting the various parts by bolts.

[0021] The present invention provides a box-shaped steel column base with easily replaceable energy-absorbing parts. Under the action of an earthquake, the box-shaped column swings around the edge of the column bottom plate. The vertical load borne by the box-shaped column can provide a certain self-resetting ability for the column base, thereby effectively reducing the residual deformation of the column base after the earthquake and improving the post-earthquake recoverability of the column base.

[0022] The present invention provides a box-shaped steel column foot with easily replaceable energy-absorbing parts. The damage of the column foot after an earthquake is only concentrated on the arc-shaped energy-absorbing plate, and the other parts always maintain elasticity. The degree of damage to the arc-shaped energy-absorbing plate after an earthquake can be directly observed, and the damaged arc-shaped energy-absorbing plate can be easily replaced by disassembling bolts, thereby quickly restoring the normal use function of the column foot.

[0023] The present invention provides a box-shaped steel column base with easily replaceable energy-absorbing components. The main deformation mode of the arc-shaped energy-absorbing plate adopted under the action of earthquake is in-plane bending, and no additional lateral restraint components are required to ensure the stability of its hysteresis performance like buckling restraint steel plates or buckling restraint steel rods.

[0024] The present invention provides a box-shaped steel column base with easily replaceable energy-consuming components. The proposed base structure can adapt to bidirectional horizontal earthquake action, and the hysteresis behaviors in the two directions are the same. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an overall schematic diagram of the present invention;

[0026] Figure 2 It is a disassembly schematic diagram of the present invention;

[0027] Figure 3 is a cross-sectional view of the present invention;

[0028] Figure 4 It is the arrangement diagram of the arc energy dissipation plate of the present invention;

[0029] Figure 5 It is a schematic diagram of a column base plate of the present invention;

[0030] Among them, there are a base plate 1, a box-shaped column 2, a column base plate 3, an arc-shaped energy-absorbing plate 4, an upper connecting piece 5, a lower connecting piece 6, and bolts 7. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described below through the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "left", "right", "upper", "lower" and the like indicate directions or positional relationships based on the attached Figure 1 and attached Figure 2 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] like Figure 1-Figure 5 As shown, the present embodiment provides a box-shaped steel column base with easily replaceable energy-absorbing components, which is mainly composed of a rocking column body and energy-absorbing components.

[0034] The swing column is welded by the box column 2 and the column bottom plate 3. The swing column is directly placed on the top of the bottom plate 1 and has no other connection with the bottom plate 1. The box column 2 is a rectangular or square cross-section steel column. The steel column can be welded by four steel plates or hot-rolled by one steel plate. The steel plate used can be Q355 steel commonly used in engineering, or high-strength steel such as Q460 or Q690. The specific steel grade can be determined according to design requirements.

[0035] The column bottom plate 3 is provided with first arc chamfers around its periphery.

[0036] The energy-consuming component is composed of eight groups of arc-shaped energy-consuming plates 4 arranged on four sides of the box-shaped column 2, each side includes two groups, each group of arc-shaped energy-consuming plates 4 has two, and is arranged in an X shape. Each side can also be provided with one or more groups of arc-shaped energy-consuming plates, and the specific specifications and quantity of the arc-shaped energy-consuming plates can be determined according to design requirements.

[0037] The arc-shaped energy dissipation plate 4 is made of Q235 steel plate with low yield strength or low yield point steel plate through wire cutting to ensure its stable hysteresis performance. There are circular holes at both ends of the arc-shaped energy dissipation plate 4, and the diameter of the circular holes is determined according to the design requirements to ensure that the column foot will not yield at both ends of the arc damper under the maximum design displacement.

[0038] There is a certain gap between the two arc-shaped energy-absorbing plates 4 arranged in an X shape, and this gap should ensure that the two arc-shaped energy-absorbing plates 4 will not contact each other under the action of an earthquake.

[0039] The upper connecting member 5 is Z-shaped, and a steel plate on one side welded to the box-shaped column 2 is welded with a triangular stiffening rib, and a steel plate on one side connected to the arc-shaped energy dissipation plate 4 is provided with two circular holes.

[0040] The lower connecting piece 6 is L-shaped, and a second arc chamfer is opened on one side of the steel plate welded to the bottom plate 1, and part of the length area is cut off at both ends of the arc area to avoid collision between adjacent lower connecting pieces 6; two circular holes are opened on the steel plate on one side connected to the arc energy dissipation plate 4.

[0041] The bolt connection between the arc-shaped energy dissipation plate 4 and the upper connecting member 5 and the lower connecting member 6 only requires manual tightening of the bolts 7 without applying a pre-tightening force, so as to ensure that when the arc-shaped energy dissipation plate deforms in the plane, both ends are in an ideal hinged state.

[0042] In order to make the column base have stable hysteresis performance under earthquake action, the screw rod of the bolt 5 should be in a fit state with the circular holes of the arc-shaped energy absorbing plate 4, the upper connecting piece 5 and the lower connecting piece 6 as much as possible while ensuring that the arc-shaped energy absorbing plate 4 can be smoothly connected by bolts.

[0043] There is a certain gap (eg, 5 mm) between the first arc chamfer of the column base plate 3 and the second arc chamfer of the lower connecting member 6, so that the box column 2 can swing around the edge of the column base plate 3 under the action of an earthquake.

[0044] The steel plate welded between the lower connecting member 6 and the bottom plate 1 serves to limit the column bottom plate 3 horizontally, thereby preventing the bottom of the column foot from sliding significantly horizontally under the action of an earthquake.

[0045] The assembly method of the above-mentioned box-shaped steel column base with easily replaceable energy-consuming parts is as follows:

[0046] Step 1: Weld the box column 2 and the column base plate 3 into a whole;

[0047] Step 2: Weld four upper connecting pieces 5 to four sides of the box column 2;

[0048] Step 3: Weld four lower connecting pieces 6 to the bottom plate 1;

[0049] Step 4: Place the box column 2 completed in step 2 on the base plate 1;

[0050] Step 5: Connect each group of arc-shaped energy-absorbing plates 4 to the upper connecting member 5 and the lower connecting member 6 through bolts 7 .

[0051] At this point, the column base assembly work is completed.

[0052] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A box-shaped steel column foot with easily replaceable energy-consuming parts, characterized in that: It comprises a base plate (1), a box-shaped column (2), a column base plate (3), an arc-shaped energy-absorbing plate (4), an upper connecting piece (5), a lower connecting piece (6) and bolts (7); The bottom of the box-shaped column (2) is fixedly connected to the column bottom plate (3); the upper connecting member (5) is arranged on the four sides of the box-shaped steel column (2); the lower connecting member (6) is arranged around the bottom of the box-shaped steel column (2) and fixed to the bottom plate (1); the arc-shaped energy-absorbing plates (4) are arranged in groups on the four sides of the box-shaped steel column (2) and are connected to the upper connecting member (5) and the lower connecting member (6) by bolts (7).

2. The box-shaped steel column base with easily replaceable energy-consuming parts according to claim 1, characterized in that: The box-shaped column (2) is a steel column with a rectangular or square cross-section, and the steel column is formed by welding four steel plates, or the steel column is formed by hot rolling one steel plate.

3. The box-shaped steel column base with easily replaceable energy-consuming parts according to claim 1, characterized in that: The column bottom plate (3) is provided with first arc chamfers on four sides.

4. The box-shaped steel column base with easily replaceable energy-consuming parts according to claim 1, characterized in that: The arc-shaped energy-absorbing plates (4) are cut from steel plates, and circular holes are opened at both ends of the arc-shaped energy-absorbing plates (4); each group of arc-shaped energy-absorbing plates (4) consists of two pieces, so that the arc-shaped energy-absorbing plates (4) arranged in the same plane are in an X shape.

5. The box-shaped steel column base with easily replaceable energy-consuming parts according to claim 1, characterized in that: A certain gap is left between the two arc-shaped energy-absorbing plates (4) arranged in an X shape.

6. The box-shaped steel column base with easily replaceable energy-consuming parts according to claim 1, characterized in that: The upper connecting member (5) is Z-shaped, and a triangular stiffening plate is welded to the portion welded to the box-shaped column (2). A circular hole is opened at the portion where the upper connecting member (5) is connected to the arc-shaped energy-absorbing plate (4) via bolts (7).

7. The box-shaped steel column base with easily replaceable energy-consuming parts according to claim 3, characterized in that: The lower connecting piece (6) is L-shaped, and has a second arc chamfer on the side that fits the bottom plate (1), and a portion of the length of the two ends of the arc chamfer is cut off; and a circular hole is formed in the portion connected to the arc-shaped energy-absorbing plate (4).

8. The box-shaped steel column base with easily replaceable energy-consuming parts according to claim 4, characterized in that: There is a certain gap between the first circular arc chamfer of the column bottom plate (3) and the second circular arc chamfer of the lower connecting member (6).

9. The box-shaped steel column base with easily replaceable energy-consuming parts according to claim 1, characterized in that: The steel plate welded between the lower connecting piece (6) and the bottom plate (1) serves to horizontally limit the column bottom plate (3).

10. The box-shaped steel column base with easily replaceable energy-consuming parts according to claim 1, characterized in that: No pre-tightening force needs to be applied to the bolts (7) between the arc-shaped energy dissipation plate (4) and the upper connecting member (5) and the lower connecting member (6).

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