A steel frame with controlled rocking and lifting in columns based on piston device

Abstract

The present invention discloses a controlled swing steel frame with column lifting based on a piston device, comprising a foundation, a lower column, a steel base and an upper column which are fixedly connected in sequence from bottom to top; the steel base is hollow inside, and a piston device is fixedly arranged inside the steel base, the piston device comprises a piston cylinder, a piston and a piston rod, the piston is slidably connected in the piston cylinder, and the sliding direction is the vertical direction, a spherical groove is arranged on the top of the piston, the bottom end of the piston rod is spherical and limited in the piston, the spherical groove of the piston and the bottom end of the piston rod form a ball joint structure, and the top end of the piston rod is fixedly connected to the bottom end of the upper column. While ensuring that the structure has sufficient earthquake resistance, it can effectively reduce the swing deformation of the structure under the action of an earthquake, reduce the risk of overturning, improve the self-reset and energy consumption capacity of the steel frame, and realize the rapid recovery of the structure's post-earthquake function.

Description

Technical Field

[0001] The invention belongs to the field of structural earthquake resistance and relates to a column-lifting controlled swaying steel frame based on a piston device. Background Art

[0002] With the advancement of construction technology, building structures must not only protect people's lives and property during earthquakes, but more importantly, quickly restore their normal use functions after earthquakes. Self-resetting structural systems can reduce earthquake response and stably dissipate earthquake energy. At the same time, they can use their self-resetting ability to reduce the residual deformation of the structure after the earthquake, facilitate replacement and repair after the earthquake, achieve rapid recovery of structural functions, and significantly reduce the economic losses caused by earthquakes. As a type of self-resetting structural system, the swing structure reduces or avoids damage to the main structure through structural swing; relaxes the connection at a specific position to concentrate the damage under the action of the earthquake on the external energy-absorbing elements; and uses post-tensioning bars or steel strands to provide self-resetting ability to effectively reduce or even eliminate the residual deformation of the structure.

[0003] The controlled rocking steel frame with column base lift, as a combination of self-resetting structure and rocking structure, allows one side of the column base to lift during earthquake by relaxing the column base node, and provides self-resetting capability in combination with post-tensioning bars or steel strands, so that the structure has good seismic performance. Although the rocking steel frame with column base lift can effectively reduce earthquake damage by amplifying the structural rocking, the large rocking deformation increases the overturning moment generated by the second-order effect, and the foundation has limited restraining effect on the column base, which reduces the anti-overturning capacity of the structure and increases the risk of structural overturning, which is not conducive to the performance of the seismic performance of the structure and its application in seismic fortification areas. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a column-lifted controlled rocking steel frame based on a piston device. While ensuring that the structure has sufficient seismic resistance, the structure above the inflection point of the bottom column can rock under the action of a strong earthquake, thereby reducing the second-order effect of the rocking deformation of the structure. It can effectively reduce the rocking deformation of the structure under the action of an earthquake, reduce the risk of overturning, improve the self-resetting and energy dissipation capacity of the steel frame, and achieve rapid recovery of the structure's post-earthquake function.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A piston-based column-mounted lifting and controlled rocking steel frame comprises a foundation, a lower column, a steel base and an upper column which are fixedly connected in sequence from bottom to top;

[0007] The steel base is hollow inside, and a piston device is fixedly arranged inside the steel base. The piston device includes a piston cylinder, a piston and a piston rod. The piston is slidably connected in the piston cylinder, and the sliding direction is vertical. A spherical groove is arranged on the top of the piston, and the bottom end of the piston rod is spherical and limited in the piston. The spherical groove of the piston and the bottom end of the piston rod form a ball joint structure, and the top end of the piston rod is fixedly connected to the bottom end of the upper column.

[0008] Preferably, the steel base is connected to a plurality of SMA strands, the bottom ends of the SMA strands are connected to the bottom ends of the steel base, the middle portions of the SMA strands penetrate the steel base, and the top ends of the SMA strands are connected to the upper columns.

[0009] Furthermore, a reinforcing angle steel is embedded outside the upper column, and the top end of the SMA strand is connected to the reinforcing angle steel.

[0010] Furthermore, a plurality of prestressed stranded wire anchors are provided at the bottom end of the steel base and the top end of the stiffening angle steel, and both ends of the SMA stranded wire are connected to the prestressed stranded wire anchors.

[0011] Furthermore, two SMA strands are provided on each side of the upper column.

[0012] Furthermore, the SMA stranded wire is made of NiTi shape memory alloy wire.

[0013] Preferably, a cross-shaped connecting seat is arranged between the steel base and the upper column, and four side plates are arranged on the cross-shaped connecting seat to form a cross shape. A plurality of damper connecting plates are evenly distributed around the cross-shaped connecting seat, and the damper connecting plates are fixed on the top of the steel base. A damper is connected between each side plate of the cross-shaped connecting seat and the damper connecting plate.

[0014] Furthermore, each damper connecting plate includes a horizontal plate and two vertical plates. The horizontal plate is fixed on the top of the steel base, and the two vertical plates are located on both sides of the cross-shaped connecting seat side plate. The damper passes through the cross-shaped connecting seat side plate, and the two ends are respectively connected to the two vertical plates.

[0015] Furthermore, the diameter of the middle of the damper is the same as that of both ends, and the diameter of the portion between the end and the middle of the damper is equal to half of the diameter of the end.

[0016] Furthermore, three dampers are arranged on each damper connecting plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention arranges a piston device in the middle of the structure. Under the action of earthquake, the piston reciprocates in the piston cylinder, causing the bottom column to "lift" and "close" at 1 / 2 of the height, forming the lifting and swaying of the upper structure; the ball joint structure is used to rotate in any direction, so that the upper column can rotate freely around the ball joint; the overturning moment makes the piston and the steel cylinder wall in close contact to transmit shear force, and the extrusion between the piston and the floor can transmit vertical load, forming an inflection point at 1 / 2 of the "closed" column, so that the upper and lower sections of the bottom column are bent in reverse curvature, reducing the bending deformation of the bottom column, thereby reducing the swaying of the upper structure and reducing the overturning moment of the structure. Since the piston only reciprocates vertically in the steel cylinder, it can effectively prevent lateral sliding when the structure sways, and there is no need to set up an additional horizontal limit device.

[0019] Furthermore, the superelastic effect of the SMA strands is utilized to provide the structure with self-resetting capability, so that the structure can return to its initial state after an earthquake without any residual deformation.

[0020] Furthermore, the damper is deformed in any direction and dissipates energy input in different directions at the same time, providing the same damping and stiffness in different directions. The good fatigue performance and welding performance of low yield point steel provide a stable energy dissipation capacity for the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a swaying single column elevation view of the present invention;

[0022] Figure 2 It is a plan view of a rocking single column of the present invention;

[0023] Figure 3 It is an exploded view of the swing single column structure of the present invention;

[0024] Figure 4 It is a schematic diagram of the piston device structure of the present invention;

[0025] Figure 5 It is a sway node arrangement diagram of the sway steel frame of the present invention.

[0026] Among them: 1. Foundation, 2. Foundation bottom plate, 3. Anchor bolt, 4. Lower column, 5. Steel base, 6. Piston cylinder, 7. Piston bottom plate, 8. Piston, 9. Piston rod, 10. Damper connecting plate, 11. High-strength bolts, 12. Cross-shaped connecting seat, 13. Damper, 14. Upper column, 15. Reinforced angle steel, 16. SMA stranded wire, 17. Prestressed stranded wire anchor. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all 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.

[0028] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] like Figure 1-3 As shown, the column-lifting controlled swaying steel frame based on the piston device of the present invention includes a foundation 1, a lower column 4, a steel base 5, a cross-shaped connecting seat 12 and an upper column 14 which are fixedly connected in sequence from bottom to top.

[0031] The foundation bottom plate 2 of the reserved hole and the foundation 1 are connected by anchor bolts 3, the bottom layer lower section column 4 is connected to the foundation bottom plate 2 by equal strength welding, the steel base 5 for fixing the piston device is welded to the H-shaped lower section column 4, the piston device is fixed in the steel base 5, the damper connecting plate 10 is connected to the top of the steel base 5 by high-strength bolts 11, the low yield point damper 13 passes through the overhanging section of the cross-shaped connecting seat 12, and the two ends are welded to the damper connecting plate 10, and the piston rod 9 is welded to the center bottom of the cross-shaped connecting plate 12.

[0032] like Figure 4As shown, the entire piston device is composed of a piston cylinder 6, a piston bottom plate 7, a piston 8 and a piston rod 9, wherein the piston bottom plate 7 is limited in the piston cylinder 6 by a positional relationship, providing support for the piston device and transmitting the vertical load on the upper part of the structure; the piston 8 is slidably connected in the piston cylinder 6, and the sliding direction is the vertical direction. A spherical groove is provided on the top of the piston 8, and the bottom end of the piston rod 9 is spherical. The bottom end of the piston rod 9 is limited in the spherical groove of the piston 8. Under the action of horizontal load, the two form a ball joint structure, and a lifting swing structure is generated in the piston cylinder 6. During the force process, the piston 8 transmits horizontal shear force by squeezing with the piston cylinder 6. The top limit device of the piston cylinder 6 prevents excessive deformation of the structure and the piston rod 9 and the piston 8 from being pulled out. The reserved height in the piston cylinder 6 is controlled according to the plane size of the building structure and the seismic fortification target. The size design of the piston rod 9 should meet the bending stiffness requirements under this condition.

[0033] An upper column 14 with a plurality of additional angle steels is welded to the top of the cross-shaped connecting seat 12 , and a reinforcing angle steel 15 is welded to the upper column 14 .

[0034] The SMA strands 16 pass through the reserved holes of the stiffening angle steel 15 and the steel base 5 and are fixed by the prestressed strand anchors 17. The SMA strands are made of NiTi shape memory alloy with stable performance. Through the stranded form, they give full play to their own superelasticity and avoid the disadvantages of the prestressed steel strands arranged throughout the building structure.

[0035] Four side plates are arranged on the cross-shaped connecting seat 12 to form a cross shape. A plurality of damper connecting plates 10 are evenly distributed around the cross-shaped connecting seat 12. The damper connecting plates 10 are fixed on the top of the steel base 5. A damper 13 is connected between each side plate of the cross-shaped connecting seat 12 and the damper connecting plate 10.

[0036] Each damper connecting plate 10 includes a horizontal plate and two vertical plates, the horizontal plate is fixed on the top of the steel base 5, the two vertical plates are located on both sides of the side plates of the cross-shaped connecting seat 12, and the damper 13 passes through the side plates of the cross-shaped connecting seat 12, and the two ends are respectively connected to the two vertical plates. The two vertical plates of each damper connecting plate 10 and the side plates of the cross-shaped connecting seat 12 have sufficient thickness to provide fixed boundary support conditions for the damper 13.

[0037] The damper 13 uses steel with a low yield point (LYP160, LYP225, Q235, etc.), which provides the damper 13 with better energy dissipation capacity and fatigue performance.

[0038] The damper 13 has a cylindrical or conical shape. The diameter of the middle and the two ends of the damper 13 is the same. The diameter of the part between the end and the middle of the damper 13 is smaller than the diameter of the end. The diameter of the part between the end and the middle is equal to half of the diameter of the end. The damper 13 is mainly made of low yield point steel and stainless steel with good ductility. The two ends are anchored by perforated steel plates or directly welded to the steel plates. The energy dissipation capacity of the damper 13 in each direction is the same, and the energy dissipation effect in multiple directions can be taken into account at the same time. For the shape design of the rod damper 13, the initial cylindrical shape is gradually optimized to a variable cross-section cone. This change increases the yield surface of the damper, enhances the energy dissipation capacity, and further saves materials. The purpose of optimizing the design of its energy dissipation performance can be achieved by adjusting the cross-sectional parameters of the steel rod. When the seismic load acts, the upper and lower anchoring end plates of the damper 13 produce relative displacement in the horizontal direction, causing the energy dissipation steel rod to deform, and when the relative displacement of the upper and lower connecting plates reaches a certain degree, the steel rod energy dissipation element will produce plastic deformation, so that the purpose of dissipating seismic energy can be achieved.

[0039] The damper 13 can be deformed in any direction, has a large yield area, and can dissipate energy input from different directions at the same time, providing the same damping and stiffness in different directions, and has the advantage of isotropy. For the damper 13, there are many types of steel materials used to make the cone, including low yield point steel, ordinary carbon steel, high strength steel, etc. Compared with ordinary carbon steel and high strength steel, low yield point steel has better ductility, fuller hysteresis curve, significant isotropic strengthening characteristics, and can greatly improve energy dissipation capacity.

[0040] like Figure 5 As shown, the piston device is placed in the middle of the bottom column of the steel frame, and the piston device realizes the swing node in the column.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0042] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the foregoing claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A column-based piston device-based controlled rocking steel frame, characterized in that: It comprises a foundation (1), a lower column (4), a steel base (5) and an upper column (14) which are fixedly connected in sequence from bottom to top; The steel base (5) is hollow inside, and a piston device is fixedly arranged inside the steel base (5). The piston device comprises a piston cylinder (6), a piston (8) and a piston rod (9). The piston (8) is slidably connected in the piston cylinder (6), and the sliding direction is the vertical direction. A spherical groove is arranged on the top of the piston (8). The bottom end of the piston rod (9) is spherical and is limited in the piston (8). The spherical groove of the piston (8) and the bottom end of the piston rod (9) form a ball joint structure. The top end of the piston rod (9) is fixedly connected to the bottom end of the upper column (14); The steel base (5) is connected to a plurality of SMA strands (16), the bottom ends of the SMA strands (16) are connected to the bottom ends of the steel base (5), the middle portions of the SMA strands (16) penetrate the steel base (5), and the top ends of the SMA strands (16) are connected to the upper column (14); A cross-shaped connecting seat (12) is arranged between the steel base (5) and the upper column (14); four side plates are arranged on the cross-shaped connecting seat (12) to form a cross shape; a plurality of damper connecting plates (10) are evenly distributed around the cross-shaped connecting seat (12); the damper connecting plates (10) are fixed to the top of the steel base (5); and a damper (13) is connected between each side plate of the cross-shaped connecting seat (12) and the damper connecting plate (10).

2. The column-lift controlled rocking steel frame based on piston device according to claim 1, characterized in that, A reinforcing angle steel (15) is embedded outside the upper column (14), and the top end of the SMA stranded wire (16) is connected to the reinforcing angle steel (15).

3. The column-lift controlled rocking steel frame based on piston device according to claim 2, characterized in that, A plurality of prestressed stranded wire anchors (17) are provided at the bottom end of the steel base (5) and the top end of the stiffening angle steel (15), and both ends of the SMA stranded wire (16) are connected to the prestressed stranded wire anchors (17).

4. The column-lift controlled rocking steel frame based on piston device according to claim 1, characterized in that, Two SMA strands (16) are arranged on each side of the upper column (14).

5. The column-lift controlled rocking steel frame based on piston device according to claim 1, characterized in that, The SMA stranded wire (16) is made of NiTi shape memory alloy wire.

6. The column-lift controlled rocking steel frame based on piston device according to claim 1, characterized in that, Each damper connection plate (10) comprises a horizontal plate and two vertical plates, the horizontal plate being fixed to the top of the steel base (5), the two vertical plates being located on both sides of the side plate of the cross-shaped connection seat (12), the damper (13) passing through the side plate of the cross-shaped connection seat (12), and the two ends being connected to the two vertical plates respectively.

7. The column-lift controlled rocking steel frame based on piston device according to claim 6, characterized in that, The middle and both ends of the damper (13) have the same diameter, and the diameter of the portion between the end and the middle of the damper (13) is equal to half the diameter of the end.

8. The column-lift controlled rocking steel frame based on piston device according to claim 1, characterized in that, Three dampers are arranged on each damper connecting plate (10).

Images