CN214169529U

CN214169529U - Soft-Story shock isolation structure

Info

Publication number: CN214169529U
Application number: CN202021627633.2U
Authority: CN
Inventors: 铃木计夫; 张峻然
Original assignee: Qingdao Qingtai Construction Technology Co ltd
Current assignee: Qingdao Chongzhi Concrete Engineering Co ltd; Qingdao Qingtai Construction Technology Co ltd; Zhang Junran
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2021-09-10
Anticipated expiration: 2030-08-07

Abstract

The utility model relates to a Soft-Story shock insulation structure, including superstructure and shock insulation layer structure, the rigidity on shock insulation layer is than being 0 ~ 0.6. The shock insulation layer adopts a heavy-constraint spiral stirrup circular frame column, and in addition, a PC steel bar and a damper are arranged on the shock insulation layer structure as required. The utility model discloses a Soft-Story shock insulation structure is when the earthquake, and seismic energy concentrates on shock insulation layer part and absorbs, and the shock resistance is extremely strong. After an earthquake, only the column head and the column foot of the bearing component column of the seismic isolation layer can be damaged, but the bearing component column can be normally used after simple maintenance and reinforcement without being pushed down for reconstruction. For a seismic isolation layer, 100% of the building space of the layer can be completely used. Because the earthquake influence of the superstructure is small, the superstructure of the building can be completely slim, and the manufacturing cost is greatly saved. Compared with the existing shock insulation structure, the cost is greatly reduced.

Description

Soft-Story shock isolation structure

Technical Field

The utility model relates to a building structure antidetonation technical field specifically is a novel shock insulation structure.

Background

First, when the earthquake occurs in osaka spirit (earthquake in the south of tokyo prefecture), there are considerable "pilotti" structural buildings (bottom large space frame structures) in the collapsed building. So-called "Piloti" structural building: it is a structural form that no shear wall (and no bearing wall) or diagonal brace, etc. is arranged at the lowest layer of the frame structure, and the structural rigidity of the layer is smaller than that of the upper structure. Due to the poor performance of such structural buildings in failure during major earthquakes, there has been a strong struggle for the same to design "Piloti" structural buildings. Since the reason for the failure of this structural building is obvious, it is not designed to give the columns of the "Piloti" layer sufficient deformability.

Secondly, the existing building earthquake-resistant design method has problems. As shown in figure 1. The existing building earthquake-proof design specification adopts a design method of full-layer yield, and each layer of beam ends is required to generate yield failure in earthquake (the red-coated part in the figure is a plastic yield state which is required to be generated at the beam ends, the column bottom and the shear wall bottom in the design, namely a strong column and weak beam design method). Therefore, the rooms on any floor need to be repaired and reinforced (or even cannot be reinforced) after the earthquake is destroyed, and the cost of repairing and reinforcing is extremely high, and the dissatisfaction of the house owner and the residents is caused.

Thirdly, the existing design method of the shock insulation structure (laminated rubber shock insulation support) has the problems. As shown in fig. 2. The biggest defects of the design method of the shock insulation structure are as follows: first, due to the diameter and height of the laminated rubber-vibration-isolating support, the seismic energy cannot be completely absorbed in this layer. Therefore, the earthquake-resistant design specifications of the Chinese buildings stipulate that: and a seismic isolation structure of a seismic isolation support is adopted, and the defense is arranged according to the earthquake intensity of the first-level earthquake during seismic design. Secondly, the building space of the seismic isolation layer cannot be utilized. Thirdly, the construction cost is greatly improved (5 to 10 percent).

SUMMERY OF THE UTILITY MODEL

The to-be-solved problem of the utility model is to provide a novel Soft-Story shock insulation structure, superstructure does not swing along with the ground swing during the earthquake, and seismic energy concentrates on the whole absorptions of building structure bottom shock insulation layer, and shock resistance is extremely strong.

In order to solve the technical problem, the utility model discloses a Soft-Story shock insulation structure, including superstructure and shock insulation layer structure, shock insulation layer structure is the circular post of heavily retraining spiral stirrup, the rigidity on shock insulation layer is than being 0 ~ 0.6.

The structural dynamic analysis and calculation model of the seismic isolation structure system adopts a 'one-particle system vibration model'.

And the shock insulation layer structure is provided with a PC steel bar.

The shock insulation layer structure is provided with a damper.

Further, the seismic isolation layer structure is arranged on the bottom layer of the building.

Further, the seismic isolation layer structure is arranged on 1-2 underground layers of the building.

Further, the underground foundation pile of the building is designed into the seismic isolation layer structure.

Furthermore, the frame columns of the seismic isolation layer structure part adopt heavy-constraint PRC columns.

Furthermore, the frame column of the seismic isolation layer part adopts a heavy-constraint RC column.

Further, the seismic isolation layer is set on the foundation layer from the bottom of the structure foundation to the junction of the soft foundation layer and the quasi-hard foundation layer.

The heavy-restraint RC column comprises a column main rib, a spiral stirrup is arranged on the column main rib, the heavy-restraint RC column is connected with the top beam-slab structure, and the top beam-slab structure comprises a beam main rib.

Set up the roof beam stirrup on the roof beam owner muscle, the fixed muscle of hanging of fixed connection on roof beam stirrup and the spiral stirrup, fixed reinforcing bar colludes on the fixed muscle of hanging, fixed reinforcing bar colludes fixed connection and buries the steel sheet underground, bury underground and fixedly set up the steel sheet on the steel sheet, through mounting hole installation PC rod diagonal brace on the steel sheet.

After adopting such structure, the utility model discloses a during the earthquake of Soft-Story shock insulation structure, superstructure is almost motionless, does not swing along with the ground swing promptly, and seismic energy concentrates on the whole absorptions of building structure bottom shock insulation layer, and the shock resistance is extremely strong.

The beneficial effects are that:

1) for a seismic isolation layer, 100% of the building space of the layer can be completely used.

2) The superstructure of a building can be designed completely according to seismic structure fortification, i.e. it can be made slim (because the superstructure has less seismic influence).

3) The cost can be greatly saved. Compared with the existing shock insulation structure (the base shock insulation of the laminated rubber shock insulation support), the cost is greatly reduced (the double-layer base does not need to be arranged). In addition to this, the present invention is,

4) in the Soft-Story part, the structural body has a damping effect. As a result of this, the number of the,

5) the natural period of the building can be effectively adjusted, and the resonance caused by earthquake motion is avoided.

6) If the post is made into a fully prestressed PC post, the building can be almost completely reset after the earthquake.

7) In areas where tsunami is likely to occur, the system can directly play a role in combating tsunami as well as earthquakes.

After a major earthquake, the buildings for earthquake resistance and shock absorption need to be repaired, but the buildings for the Soft-Story earthquake isolation structure construction method only need to be repaired by one layer! In the basic shock insulation building, 3 rubber supports and dampers need to be replaced.

Construction cost:

the Soft-Story seismic isolation structure building is cheaper than a foundation seismic isolation building, and the additional cost is very low compared with the common seismic-resistant and seismic-isolation building. Such as: construction cost 10 billion yen additional cost of the building: if the increase of the horizontal stirrup of the column is doubled, about 200 ten thousand yen needs to be added, and the cost of adding the damper is about 1000 ten thousand yen if the damper is properly installed. The additional cost accounts for only 1.2%.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 shows the design method of earthquake resistance specified by the existing building earthquake resistance code.

Fig. 2 is an animation analysis diagram of a base isolation (laminated rubber isolation bearing).

FIG. 3 is a schematic view of a base isolation (laminated rubber isolation bearing).

FIG. 3-1 is a technical scheme (principle) of a novel soft-store seismic isolation structure.

FIG. 4 is a technical scheme embodiment of designing the bottom layer (1-2 layers) of a building into a Soft-Story seismic isolation layer.

FIG. 4-A is a simplified stress diagram of an embodiment of a technical scheme in which the bottom layer (1-2 layers) of a building is designed into a Soft-Story seismic isolation layer.

Fig. 5 is an enlarged view of 13 in fig. 4.

FIG. 6 is a technical scheme embodiment of designing 1-2 underground layers of a building into a Soft-Story seismic isolation layer.

FIG. 6-A is a simplified stress diagram of an embodiment of a technical scheme in which 1-2 underground layers of a building are designed into a Soft-Story seismic isolation layer.

Fig. 7 is an enlarged view of 18 of fig. 6.

Fig. 7-a is a 7-a index diagram of fig. 7 and 11.

FIG. 8 is a technical scheme embodiment of designing the underground pile foundation of the building into a Soft-Story seismic isolation layer.

FIG. 8-A is a simplified stress diagram of an embodiment of the technical scheme of designing an underground pile foundation of a building into a Soft-Story seismic isolation layer.

Fig. 9 is an enlarged view of 19 in fig. 8.

FIG. 10 shows an embodiment of the safety wall installed in the underground seismic isolation layer.

FIG. 11 is an enlarged view of the seismic isolation layer of appendage 10.

FIG. 12 is a diagram showing the relationship between bending moment M and displacement angle R in seismic isolation structure design.

FIG. 13 is a graph of input seismic force levels and maximum deformation angles.

FIG. 14 is a schematic diagram of a re-constrained RC column structure.

Fig. 15 is a column cross-sectional view of a heavily constrained RC column.

The reference numbers in the drawings are: 1. a frame beam end plastic hinge region; 2. a frame column foot plastic hinge region; 3. a frame beam; 4. a frame column; 5. a shear wall; 6. a plastic hinge region at the bottom of the bottom shear wall; 7. an elastic support; 8. a laminated rubber support; 9. reserving structural deformation gaps on the base shock insulation layer; 10. a structural foundation above the seismic isolation layer; 11. a lower structure foundation of the seismic isolation layer; 11-1, superstructure; 11-2, a seismic isolation layer column; 11-3, a stable wall mechanism; 7-1, fixing a hanging rib; 7-2, fixing a steel bar hook; 7-3, embedding steel plates (wherein the embedding steel plates of the columns are arc-shaped, and the embedding steel plates of the beams are angle-shaped); 7-4, connecting steel plates; 7-5 beam stirrups; 7-6, a nut; 7-7, a gasket; 7-8, a PC steel bar diagonal brace; 7-9, connecting a PC steel bar with a screw rod; 7-10 parts of spiral stirrup; 7-11, welding positions of the fixed steel bars and the embedded steel plates and welding positions of the external connecting steel plates and the embedded steel plates in the column beam; 12. a superstructure; 13. an above-ground seismic isolation layer; 14. a PRC column; 15. Mass points are simplified; 16. a damper; 17. a spring; 18. an underground seismic isolation layer; 19. a pile foundation seismic isolation layer; 20. underground piles (PRC columns); 21. a soft layer of an underground foundation; 22. a beam plate structure at the top of the shock insulation layer; 23. a seismic isolation layer column; 24. a seismic isolation layer beam; 25. a seismic isolation layer foundation beam plate structure; 26. a PC steel bar diagonal brace; 27. a foundation; 28. a foundation beam; 29. a safety wall; 30. a beam main rib; 31. a column main rib; 32. a top beam panel; 33. the RC column is heavily constrained.

Detailed Description

In order to make the technical problem, technical scheme and beneficial effect that the utility model solved more clearly understand, it is right below to combine figure and embodiment the utility model discloses carry out further explanation. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.

The utility model provides a novel Soft-Story shock insulation structure, according to the above-mentioned the utility model discloses a technical scheme (principle): arranging a shock insulation layer at the bottom of the structure; the rigidity of the shock insulation layer is small enough, so that the structural column member of the shock insulation layer generates eccentric displacement to absorb seismic energy firstly during earthquake; the structure calculation adopts a mass point vibration model. Accordingly, the technical embodiments of the utility model have the following:

1. the bottom layer (1-2 layers) of the building is designed into a Soft-Story shock insulation layer.

See fig. 4 and 5. Further, in the scheme of the embodiment, the frame columns (1-2 layers above the ground) of the seismic isolation layer adopt the heavy-constraint PRC columns (semi-prestressed reinforced concrete columns, as mentioned above, stirrups at plastic hinges of column bases of the column heads are encrypted), and the seismic isolation layer has good restoration performance. The size of the section of the shock insulation layer column is determined according to the rigidity ratio of 0-0.6 of the shock insulation layer. The structural calculation vibration model adopts a 'one particle vibration model'.

2. 1-2 underground layers of a building are designed into a Soft-Story shock isolation layer.

As shown in fig. 6, 7 and 7-a. Further, in the embodiment, a heavily-constrained RC column (as described above, a stirrup at a plastic hinge at the column head base is encrypted) is adopted for a frame column (1-2 underground layers) at the part of the seismic isolation layer; the size of the section of the shock insulation layer column is determined according to the rigidity ratio of 0-0.6 of the shock insulation layer. Calculating the needed PC inclined strut (ensuring the structural deflection recovery after the earthquake) between the adjacent columns of 1-2 underground layers according to the design; the periphery of the underground 1-2 layers of structures is provided with a structural deformation joint (1.5-2.0 m), so that the underground layer is prevented from vibrating and deforming to impact with an underground retaining wall (safety wall) during earthquake; the structural calculation vibration model adopts a 'one particle vibration model'.

3. The underground foundation pile of the building is designed into a Soft-Story shock insulation layer.

As shown in fig. 8 and 9. Further, in this embodiment, the seismic isolation layer is set at the base layer from the bottom of the structure foundation to the junction of the weak base layer (weak layer) and the quasi-hard base layer. Due to the easy deformation characteristic of the soft layer foundation, the seismic energy is easy to absorb in the layer; the method comprises the following steps of (1) adopting a circular spiral stirrup PC pile (fully prestressed reinforced concrete column) as a foundation pile of a seismic isolation layer member, wherein the section size is determined according to the basic design calculation (the rigidity is small enough); the structure calculation adopts a 'one-mass-system vibration model', the structure above the bottom of the foundation is simplified into one mass point, and the junction from the bottom of the foundation to the soft foundation layer (weak layer) and the quasi-hard foundation layer is a bearing pile (elastic pile) of a shock insulation layer structure, namely the inverted vibrator 'one-mass-system vibration model'.

Positioning of Soft-Story seismic isolation structure

As shown in the following table, by setting the rigidity ratio of the Soft-Story seismic isolation structure within the range of 0.6 to approximately equal to 0, the "rigidity ratio of the structural design" can be made continuous. I.e. any stiffness ratio can be chosen and designed.

The heavy-constraint RC column 33 comprises a column main rib 31, spiral stirrups 7-10 are arranged on the column main rib 31, the heavy-constraint RC column is structurally connected with a top beam plate 32, and the top beam plate 32 structurally comprises a beam main rib 30.

The beam main reinforcement is provided with a beam stirrup 7-5, the beam stirrup 7-5 and the spiral stirrup are fixedly connected with a fixed hanging reinforcement 7-1, a fixed reinforcement hook 7-2 is fixed on the fixed hanging reinforcement 7-1, a buried steel plate 7-3 is fixedly welded on the fixed reinforcement hook 7-2, a steel plate 7-4 is welded on the buried steel plate 7-3, a PC steel bar inclined strut 7-8 is arranged on the steel plate 7-4 through a mounting hole, and a PC steel bar connecting screw 7-9, a nut 7-6 and a gasket 7-7 are arranged on the mounting hole;

TABLE-1.1 location of Soft-Story seismic isolation structure

The vertical bearing member frame column of the shock insulation layer structure adopts a heavy constraint column, and has large deformation capacity and deformation restoring force.

The shock insulation layer structure is provided with the PC steel bar, so that the shock insulation layer structure has good deformation recovery capability, and the deformation of the shock insulation layer structure is completely recovered after the shock is absorbed.

The shock insulation layer structure is provided with the damper, so that the shock insulation layer structure has a good shock absorption effect, the inherent period of the shock insulation layer structure can be effectively adjusted, and the resonance caused by the shock insulation layer structure and the seismic oscillation is avoided.

Design method of novel soft-storage shock insulation structure

1. General rule

The application range is as follows: 1) the design object is a building with a first layer of a 'Piloti' structure; 2) the structural rigidity ratio of the layer is 0-0.6, and a Soft-Story shock isolation layer can be continuously designed; 3) the layer adopts a reinforced concrete column with enough deformability; 4) the number of floors of the building structure is below 20.

The detailed explanation is as follows:

the column of the Piloti part of one layer is designed into a heavy constraint reinforced concrete column, and the maximum deformation capacity of the column is as follows: the interlayer displacement angle (ratio of the column top displacement value to the column clear height) R is about equal to 1/20-1/10. For this purpose,

1) the RC column of the seismic isolation layer is reinforced by spiral stirrups (the distance between the spiral stirrups is less than or equal to 5cm) on column head column bases in principle. The stirrup diameter is phi 13.

2) In order to prevent buckling of the main bar, a large diameter (screw steel having a diameter of 25 or more) is used as the main bar as much as possible.

3) And arranging an energy consumption damper on the seismic isolation layer according to the requirement.

4) If a safety wall is required to be arranged, as shown in the attached

drawings

10 and 11, the underground 1-2 is designed into a Soft-Story layer, and the beams of the top plate of the underground layer extend out. A certain gap (structural earthquake deformation joint) is left between the outer end of the underground column and the security wall

Use material of Soft-Story seismic isolation layer part

1) Concrete strength: not less than 50N/mm²。

2) Reinforcing steel bars: ordinary steel bars and/or high-strength steel bars.

3) A PC steel bar: and (4) referring to the relevant design standard of the prestressed concrete structure of the building earthquake-resistant design specification.

3. Structural design

1) Structural calculation analysis vibration system: one mass point is a vibration model. The analysis of the elastoplastic response is a precondition.

2) Restoring force characteristic:

and calculating the restoring force characteristic of the Soft-Story seismic isolation layer.

The restoring force of the component is characterized in that: the values of Mcr, My, Mk1k3max, ML and the displacements (curvatures) of the respective points are calculated.

Based on the calculation results, the layer restoring force characteristic can be calculated.

See fig. 12 for details.

3) Vibration analysis (elasto-plastic response analysis)

(1) Inputting seismic waves: input waves such as short-period waves, resonant waves, long-period waves and the like are selected (recording waves representing the characteristics of the foundation are selected as much as possible).

(2) Inputting a seismic force level: the design targets are level 1, level 2, and level 3.

Level 1 ≈ 200gal

Leveling 2 ≈ 400 ~ 500gal (seismic force of structural member section calculation)

Leveling 3 ≈ 400 ~ 500gal (seismic force for safety of frame design based on toughness)

(3) Maximum deformation in response: for level 3, this corresponds to a 60% -70% shift of the Lc point.

(4) Residual deformation: our target residual distortion is, as it varies from design to design: 1/100 interlayer displacement angle.

4) For the above structural design principle, the detailed description is as follows:

(1) the input seismic waves are basically seismic waves representing the characteristics of the ground, but are difficult to select in many cases. Therefore, we must do: the resonance waves are also checked and confirmed by analyzing the recorded waves of the hard ground and the soft ground.

(2) And inputting the calculation and checking of the seismic level to a level 3. The design not only needs to consider the bearing capacity design, but also needs to consider the deformation capacity design, and further needs to consider that the construction cost cannot be improved.

(3) Maximum deformation in response: see fig. 13 for details.

At the point Lc in the figure, if sufficient deformability is enhanced, the interlayer deflection angle may reach 1/15-1/10; the interlayer displacement angle of level 3 can be set to 1/30-1/20, and sufficient safety can be obtained. Therefore, the design time is as follows:

the displacement angle of the level 2 earthquake adopts R2 approximately equal to 1/100

The displacement angle of the level 3 earthquake adopts R3 approximately equal to 1/30

(4) Residual deformation: not only "residual deformation of dead load", but also a dynamic final residual displacement value (a fraction of the value of the dead load) can be obtained by vibration analysis.

(5) And others:

layer recovery: a prestressing technique is utilized.

The method comprises the following steps: 1) prestressed reinforcement is arranged in the axial force direction of the column

2) A PC steel rod was used. The PC steel bar diagonal brace is used on the premise of not influencing the use function of the layer.

A damper: various dampers are already on the market, or new dampers are developed.

Door stopper (limiter, safety wall): safety arranged around the periphery of basement

A security wall, or a new type of security wall is considered.

And fourthly, only allowing the seismic isolation layer column to generate yield failure (the beam does not generate yield failure) during earthquake.

Characteristic value of vibration equation (elasto-plastic response analysis):

m^..x+cx+kx＝f(t)x

m^..y+cy+ky＝f(t)y

m: n particle → 1 particle

c 5-10% damper

k: considering the periodic influence of the structure in addition to the maximum deflection during earthquake

Sixthly, response seismic force (design horizontal force) of the superstructure: considered as 0.2.

Claims

1. A Soft-Story shock isolation structure is characterized in that: including superstructure and shock insulation layer structure, shock insulation layer structure sets up the PC rod iron, shock insulation layer structure is the circular post of heavily retraining spiral stirrup, the rigidity on shock insulation layer is than being 0 ~ 0.6.

2. The Soft-Story seismic isolation structure of claim 1, wherein: the shock insulation layer structure is provided with a damper.

3. The Soft-Story seismic isolation structure of claim 1 or 2, wherein: the shock insulation layer structure is arranged at the bottom layer of the building.

4. The Soft-Story seismic isolation structure of claim 1 or 2, wherein: the seismic isolation layer structure is arranged on 1-2 underground layers of a building.

5. The Soft-Story seismic isolation structure of claim 1 or 2, wherein: and designing the underground foundation pile of the building into the seismic isolation layer structure.

6. The Soft-Story seismic isolation structure of claim 1 or 2, wherein: and the frame column of the seismic isolation layer structure adopts a heavy-constraint PRC column.

7. The Soft-Story seismic isolation structure of claim 1 or 2, wherein: and the frame column of the seismic isolation layer structure adopts a heavy-constraint RC column.

8. The Soft-Story seismic isolation structure of claim 1 or 2, wherein: and the seismic isolation layer is set in the foundation layer from the bottom of the structure foundation to the junction of the soft foundation layer and the quasi-hard foundation layer.

9. The Soft-Story seismic isolation structure of claim 7, wherein: the heavy-restrained RC column comprises a column main rib, a spiral stirrup is arranged on the column main rib, the heavy-restrained PRC column is connected with the top beam-slab structure, and the top beam-slab structure comprises a beam main rib.

10. The Soft-Story seismic isolation structure of claim 9, wherein: set up the roof beam stirrup on the roof beam owner muscle, the fixed muscle of hanging of fixed connection on roof beam stirrup and the spiral stirrup, fixed reinforcing bar colludes on the fixed muscle of hanging, fixed reinforcing bar colludes fixed connection and buries the steel sheet underground, bury underground and fixedly set up the steel sheet on the steel sheet, through mounting hole installation PC rod diagonal brace on the steel sheet.