CN111425039A - Micro-prestress self-resetting wall provided with self-resetting variable-friction damper and construction method thereof - Google Patents
Micro-prestress self-resetting wall provided with self-resetting variable-friction damper and construction method thereof Download PDFInfo
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- CN111425039A CN111425039A CN202010254881.5A CN202010254881A CN111425039A CN 111425039 A CN111425039 A CN 111425039A CN 202010254881 A CN202010254881 A CN 202010254881A CN 111425039 A CN111425039 A CN 111425039A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- E—FIXED CONSTRUCTIONS
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- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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Abstract
The invention discloses a micro-prestress self-resetting wall with a self-resetting variable-friction damper and a construction method thereof, wherein the micro-prestress self-resetting wall comprises a foundation beam, a plurality of horizontal walls arranged on the foundation beam, and prestressed tendons which penetrate through and connect the horizontal walls and the foundation beam, wherein the variable-friction dampers are arranged among the horizontal walls and between the horizontal walls and the foundation beam for connection and fixation; during construction, a prestressed tendon channel is reserved on a foundation beam, a middle friction plate is arranged, inner friction plates or middle friction plates are arranged on a plurality of corresponding horizontal walls, the horizontal walls and the foundation beam are fixedly connected, and prestressed tendons are arranged and then are tensioned slightly. Under the action of an earthquake, the variable friction dampers arranged between walls and between the walls and the foundation beams not only can consume a large amount of earthquake motion input energy through friction, but also can realize self-resetting of the variable friction dampers, and can further provide self-resetting force to eliminate residual deformation of the walls by combining the arrangement of the prestressed tendons.
Description
Technical Field
The invention belongs to the field of civil engineering, and particularly relates to a micro-prestress self-resetting wall with a self-resetting variable-friction damper and a construction method thereof.
Background
The earthquake brings huge economic loss and casualties to human beings. The traditional anti-seismic design adopts a ductility design method, namely, under the action of an earthquake, certain parts in the structure are allowed to yield and damage to generate a predicted structural damage form, so that the whole structure is ensured not to lose functions, and most of seismic energy is dissipated through plastic deformation of the member after yielding, so that the aim of ensuring the safety of the main structure is fulfilled. Although the traditional design method has certain reliability in the aspect of avoiding collapse and casualties of buildings and can meet the earthquake fortification targets of 'small earthquake damage prevention, medium earthquake repairable and large earthquake damage', the repair cost is usually higher than the reconstruction cost in the repair work after the medium earthquake and the large earthquake, so that the earthquake fortification target is not effectively finished.
The self-resetting wall is a structural form which provides lateral rigidity and self-resetting capability for a structure by tensioning prestressed tendons and consumes seismic energy by installing various types of energy consumption components. The self-reset wall can effectively reduce the lateral movement and residual deformation between structural layers.
However, the existing self-resetting prefabricated wall needs to apply high prestress in order to improve rigidity, self-resetting capability and shear bearing capacity. And too big prestressing force then can lead to the reduction of structure ductility, can't play favorable action on the contrary to the anti-seismic, along with exerting initial prestressing force grow, prestressing force loss is also inevitable, simultaneously, and the requirement of concrete local pressure-bearing is also difficult for satisfying.
Disclosure of Invention
The purpose of the invention is as follows: the first purpose of the invention is to provide a micro-prestressed wall which can consume energy under the action of earthquake and can realize complete self-resetting;
the second purpose of the invention is to provide a construction method of the micro-prestressed wall.
The technical scheme is as follows: the invention relates to a micro-prestress self-resetting wall provided with a self-resetting variable friction damper, which comprises a foundation beam, a plurality of horizontal walls arranged on the foundation beam, a prestressed tendon penetrating through and connecting the horizontal walls and the foundation beam, wherein the variable friction damper is arranged between the horizontal walls and the foundation beam for connection and fixation, the variable friction damper comprises an inner friction plate and an outer friction plate which are stacked or sleeved, the outer friction plate is arranged on the outer side of the middle friction plate, the contact surfaces of the middle friction plate and the outer friction plate are embedded sawtooth-shaped fluctuating slopes, and the inner friction plate and the middle friction plate are respectively arranged between a plurality of adjacent horizontal walls and between the horizontal walls and the foundation beam.
The prestressed tendons and the variable friction damper are combined and applied to the wall body, and the self weight of the wall body is combined at the same time, so that the energy under the action of an earthquake can be consumed, the residual deformation of the prefabricated reinforced concrete structure under the action of the earthquake can be eliminated or reduced, the shearing resistance of the wall body is improved, the post-tensioning prestress is obviously reduced, and the obvious plastic deformation of main structural components such as a prefabricated horizontal wall section and the like is avoided; meanwhile, the variable rigidity can be realized, and the reaction of the structure under earthquakes with different intensities can be considered.
Furthermore, the inner friction plate, the middle friction plate, the outer friction plate and the horizontal wall body of the device are fixedly connected through bolts, and disc springs are sleeved on the bolts positioned outside the outer friction plate. The middle friction plate is provided with a reserved hole for the bolt of which the middle friction plate, the inner friction plate and the outer friction plate slide relatively. Preferably, the middle friction plate may be H-shaped, and the inner friction plate may be U-shaped, and the inner friction plate is sleeved in the middle friction plate.
Furthermore, the height of the inner friction plate and the outer friction plate of the variable friction damper is larger than the upper half part of the middle friction plate, and the steel backing plate is arranged at the position of the inner friction plate and the outer friction plate which is higher than the middle friction plate, and the inner friction plate and the outer friction plate are fixedly connected through bolts.
Furthermore, shear keys are arranged among the horizontal walls and between the horizontal walls and the foundation beams for joggling.
The construction method of the micro-prestressed self-resetting wall comprises the following steps: the prestressed rib channel is reserved on the foundation beam, the middle friction plate is arranged, the inner friction plate or the middle friction plate is arranged on the corresponding horizontal walls, the horizontal walls and the foundation beam are fixedly connected, and the prestressed rib is arranged and then is tensioned slightly.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: under the action of an earthquake, the variable friction dampers arranged between walls and between the walls and the foundation beams not only can consume a large amount of earthquake motion input energy through friction, but also can realize the self-resetting of the variable friction dampers, and can further provide self-resetting force to eliminate the residual deformation of the walls by combining the arrangement of the prestressed tendons; meanwhile, the horizontal lateral stiffness of the wall, the starting force of the vertical variable friction damper and the allowed displacement are determined by the pre-tightening force of the bolts, the number and the arrangement form of the disc springs, the friction coefficient of friction materials, the size of the sawtooth slope surface and the length of a screw hole groove, so that the operation is easy and controllable, the energy consumption capability is easy to quantitatively express, and the structural design is convenient; in addition, almost all parts of the device can be processed and finished on a non-construction site according to needs and then transported to a construction site for assembly, and the whole assembly process is dry operation, so that the labor cost, the engineering progress and the engineering quality are effectively controlled.
Drawings
FIG. 1 is a schematic structural diagram of a self-resetting wall according to the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic structural view of a variable friction damper according to the present invention;
FIG. 4 is a schematic view of the structure of the outer friction plate and the bolt preformed hole of the variable friction damper of the present invention;
FIG. 5 is a schematic view of the structure of the friction plate and the bolt preformed hole in the variable friction damper of the present invention;
FIG. 6 is a schematic view of the structure of the inner friction plate and the bolt preformed hole of the variable friction damper according to the present invention;
FIG. 7 is a schematic view of the structure of the steel backing plate and the bolt preformed hole of the variable friction damper of the present invention;
FIG. 8 is a schematic view of the variable friction damper of the present invention in an initial position;
FIG. 9 is a schematic view of the variable friction damper of the present invention sliding in tension.
Detailed Description
The technical solution of the present invention is further described in detail below with reference to the accompanying drawings.
The micro-prestress self-resetting wall is mainly used for improving the energy consumption capacity of the fabricated concrete prefabricated wall under the earthquake action, effectively eliminating or reducing the residual deformation of the structure under the earthquake action under the condition of applying micro-stress, and improving the shearing resistance of the wall and the assembly efficiency of the structure. As shown in fig. 1 and 2, the micro-prestressed self-restoring wall specifically comprises a main body member composed of a precast foundation beam 1 provided with shear keys 12 and a plurality of sections of precast concrete horizontal walls 2 provided on the foundation beam 1 and containing the shear keys 12, and a connecting member composed of a vertical variable friction damper 4 capable of being completely self-restored and prestressed tendons 3, wherein the vertical variable friction damper 4 is arranged at two side ends of the horizontal wall 2. The horizontal walls 2 and the foundation beam 1 are joggled by the shear keys 12, so that the shearing resistance bearing capacity is improved, and the horizontal lateral movement is effectively reduced; meanwhile, the vertical variable friction damper 4 is combined, so that the small residual displacement after the earthquake can be ensured, the strength and the rigidity are reduced less, the reduction of the ductility of the structure caused by the application of overlarge prestress is avoided, the construction process is simplified, the post-disaster repair and the quick use are facilitated, and the economic loss caused by the earthquake can be greatly reduced. In addition, a channel for the prestressed tendons to penetrate is reserved on each horizontal wall 2 and each foundation beam 2, the prestressed tendons 3 are combined to apply pretension to assemble each horizontal wall 2 and each foundation beam 1, the unbonded prestressed tendons 3 which are post-tensioned play a role in assembling the walls in the installation stage, bear bending moment and provide self-resetting force in the use stage, the prestressed tendons 3 of the horizontal walls 2 are tightly attached together after being assembled, equivalently, a rotation point is pre-designated for the prefabricated walls 2, the motion form of the horizontal walls 2 is rigid rotation around the rotation point in the earthquake process, and the deformation of the horizontal walls 2 is effectively reduced or even eliminated. Thus, the horizontal wall 2 is maintained substantially in the elastic phase after the earthquake, thereby facilitating the recycling and reassembly of the components.
As shown in fig. 3, the vertical variable friction damper 4 includes stacked or sleeved inner friction plates 5 and middle friction plates 6, preferably in a sleeved manner, the middle friction plates 6 may be H-shaped, the inner friction plates 5 may be U-shaped, the inner friction plates 5 are sleeved in the middle friction plates 6, the inner friction plates 5 and the middle friction plates 6 are respectively disposed between a plurality of adjacent horizontal walls 2 and between the horizontal walls 2 and the foundation beams 1, for example, the inner friction plates 5 are pre-embedded in the upper horizontal wall 2 in a factory prefabrication stage, and then the corresponding middle friction plates 6 are pre-embedded in the adjacent lower horizontal wall 2 in the factory prefabrication stage, and the common working performance of the middle friction plates 6 and the prefabricated horizontal walls 2 is improved by shear studs. The outer side of the middle friction plate 6 is provided with an outer friction plate 7. The inner friction plate 5, the middle friction plate 6, the outer friction plate 7 and the horizontal wall bodies 2 are fixedly connected through friction type high-strength bolts 8, namely, the horizontal wall bodies 2 and the foundation beam 1 are connected together through bolts 8 on the pre-tightening vertical variable friction damper 4, the bolts 8 are respectively sleeved with a plurality of disc springs 10 on the outer side of the outer friction plate 7 to fix the outer friction plate and apply pre-tightening on the disc springs 10 to provide initial friction force of the vertical variable friction damper 4, and the size of starting force can be changed by adjusting the size of the pre-tightening force of the variable friction damper 4, so that the variable friction damper is suitable for areas with different intensity. The contact surfaces of the middle friction plate 6 and the outer friction plate 7 are embedded sawtooth-shaped fluctuating slopes, and a bolt reserved hole 9 for the relative sliding of the middle friction plate 6, the inner friction plate 5 and the outer friction plate 7 is formed in the middle friction plate 7. The vertical variable friction damper 4 has self-resetting performance through the sawtooth slope surface structure between the outer friction plate 7 and the middle friction plate 6, the arrangement of the disc spring 10 and the gravity action of the horizontal wall body 2 above the variable friction damper 4, and the requirement on the size of prestress is reduced, so that the prefabricated horizontal wall body is assembled and the self-resetting performance is realized only by small prestress. The height of the inner friction plate 5 and the outer friction plate 7 is larger than the upper half part of the middle friction plate 6, the steel backing plate 11 is arranged at the position where the inner friction plate 5 and the outer friction plate 7 are higher than the middle friction plate 6, and the inner friction plate 5 and the outer friction plate 7 are fixedly connected through the bolt 8, so that when the inner friction plate and the middle friction plate 6 move relatively, the inner friction plate and the outer friction plate work together all the time without sliding.
Further, as shown in fig. 4 to 7, the inner friction plate 5 of the variable friction damper 4 is opened with six circular bolt allowance holes 13 for passing the bolts 8, and two circular bolt allowance holes 13 are opened at corresponding positions of the upper portion of the inner friction plate 5 and the upper portion of the outer friction plate 7 for passing the bolts 8. The middle friction plate 6 is provided with a round-angle rectangular bolt reserved hole 9 at the position where the bolt 8 correspondingly penetrates, so that a space is reserved for the bolt 8 when the middle friction plate 6, the inner friction plate 5 and the outer friction plate 7 slide relatively. Six round bolt preformed holes 13 are formed in the outer friction plate 7 and used for allowing bolts 8 to penetrate through, and two round bolt preformed holes 13 are formed in the corresponding positions of the upper portion of the outer friction plate 7 and the upper portion of the inner friction plate 5 and used for allowing the bolts 8 to penetrate through. Two circular bolt preformed holes 13 are also formed in corresponding positions on the steel backing plate 11, and the two bolts 8 are pre-tightened to penetrate through the steel backing plate.
The construction method of the micro-prestressed self-resetting wall comprises the following steps: the prestressed rib channel is reserved on the foundation beam (1), the middle friction plate (6) is arranged, the inner friction plates (5) or the middle friction plates (6) are arranged on the corresponding horizontal walls (2), the horizontal walls (2) and the foundation beam (1) are fixedly connected, and the prestressed ribs (3) are arranged and then are tensioned slightly.
The working principle is as follows: under the action of an earthquake, the prestressed ribs and the vertical variable friction dampers arranged at two ends of the wall body can provide self-resetting force to eliminate residual deformation of the wall body, meanwhile, under the action of bolt pretightening force, the variable friction dampers consume a large amount of earthquake motion input energy through friction, and under the action of the sawtooth slope surfaces of the outer friction plate and the middle friction plate, the self-resetting of the variable friction dampers is realized.
Specifically, as shown in fig. 8 and 9, when an earthquake occurs, one side of the precast concrete horizontal wall is pressed, when the earthquake force reaches a certain amplitude, the gap between the walls on the side of tension is opened, the whole horizontal wall rotates around the side of pressing to form a rigid body, and at this time, the inside of the variable friction damper on the side of tension slides. Because pretightening force is applied to the disc spring, the contact surfaces of the sawteeth of the outer friction plate and the middle friction plate with the slope surface and the contact surfaces of the middle friction plate and the inner friction plate generate initial friction force, namely, when the middle friction plate slides with the outer friction plate and the inner friction plate, energy generated by earthquake is consumed through the friction force. When the middle friction plate and the outer friction plate slide along the slope surface, the disc spring is compressed to generate larger normal pressure on the outer friction plate, so that the friction force of the saw teeth of the outer friction plate and the middle friction plate contacting the slope surface and the contact surface of the middle friction plate and the inner friction plate is increased, and the variable friction energy consumption principle is realized. After the earthquake, the horizontal wall body returns to the initial position under the combined action of the gravity of the horizontal wall body, the disc spring force and the prestress, so that the self-resetting is realized, and the residual displacement after the earthquake is effectively reduced.
The shear force keys between the precast concrete horizontal walls and between the bottom precast concrete horizontal walls and the precast foundation beams are joggled to improve the shear-resistant bearing capacity, and the self-resetting force provided by the variable friction damper reduces the requirement on the size of the prestress, so that the prestressed ribs only need small prestress to be used for assembling the precast walls and providing the self-resetting force. However, when the earthquake action is small, the horizontal wall bodies cannot be opened, when the earthquake action exceeds a certain limit, the contact surfaces of the horizontal wall bodies are opened, and the friction energy consumption of the variable friction dampers is realized, so that the damage to main body components such as the prefabricated horizontal wall bodies is avoided. After the earthquake, the whole wall is restored to the original position under the self-resetting force provided by the prestress, the self gravity of the wall body and the disc-shaped spring force in the variable friction damper.
Claims (8)
1. The utility model provides a little prestressing force is from restoring to throne wall with become friction damper from restoring to throne which characterized in that: the novel foundation beam comprises a foundation beam (1), a plurality of horizontal walls (2) arranged on the foundation beam (1), and prestressed ribs (3) which penetrate through the horizontal walls (2) and the foundation beam (1) and are connected with the horizontal walls (2) and the foundation beam (1), wherein variable friction dampers (4) are arranged between the horizontal walls (2) and the foundation beam (1) for connection and fixation, each variable friction damper (4) comprises an inner friction plate (5) and an outer friction plate (6) which are stacked or sleeved, the outer friction plate (7) arranged on the outer side of the middle friction plate (6), the contact surfaces of the middle friction plate (6) and the outer friction plate (7) are sawtooth-shaped and fluctuant surfaces which are embedded, and the inner friction plate (5) and the middle friction plate (6) are respectively arranged between the adjacent horizontal walls (2) and are respectively arranged between the horizontal walls (2) and the foundation beam (1).
2. The micro-prestressed self-resetting wall provided with the self-resetting variable-friction damper according to claim 1, characterized in that: the inner friction plate (5), the middle friction plate (6), the outer friction plate (7) and the horizontal wall body (2) are fixedly connected through bolts (8).
3. The micro-prestressed self-resetting wall provided with the self-resetting variable-friction damper according to claim 1, characterized in that: and a bolt reserved hole channel (9) for the relative sliding of the middle friction plate (6), the inner friction plate (5) and the outer friction plate (7) is formed in the middle friction plate (6).
4. The micro-prestressed self-resetting wall provided with the self-resetting variable-friction damper according to claim 2, characterized in that: and a disc spring (10) is sleeved on the bolt (8) and positioned outside the outer friction plate (7).
5. The micro-prestressed self-resetting wall provided with the self-resetting variable-friction damper according to claim 1, characterized in that: the middle friction plate (6) is H-shaped, the inner friction plate (5) is U-shaped, and the inner friction plate (5) is sleeved in the middle friction plate (6).
6. The micro-prestressed self-resetting wall provided with the self-resetting variable-friction damper according to claim 5, characterized in that: the height of the inner friction plate (5) and the outer friction plate (7) is larger than the upper half part of the middle friction plate (6), and a steel backing plate (11) is arranged at the position, higher than the middle friction plate (6), of the inner friction plate (5) and the outer friction plate (7), and the inner friction plate, the middle friction plate and the outer friction plate are fixedly connected through a bolt (8).
7. The micro-prestressed self-resetting wall provided with the self-resetting variable-friction damper according to claim 1, characterized in that: shear keys (12) are arranged among the horizontal walls (2) and between the horizontal walls (2) and the foundation beam (1) for joggling.
8. The construction method of the micro-prestressed self-restoring wall as set forth in claim 1, characterized by comprising the steps of: the prestressed rib channel is reserved on the foundation beam (1), the middle friction plate (6) is arranged, the inner friction plates (5) or the middle friction plates (6) are arranged on the corresponding horizontal walls (2), the horizontal walls (2) and the foundation beam (1) are fixedly connected, and the prestressed ribs (3) are arranged and then are tensioned slightly.
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| CN202010254881.5A CN111425039B (en) | 2020-04-02 | 2020-04-02 | Micro-prestress self-resetting wall provided with self-resetting variable-friction damper and construction method thereof |
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| CN202010254881.5A CN111425039B (en) | 2020-04-02 | 2020-04-02 | Micro-prestress self-resetting wall provided with self-resetting variable-friction damper and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113833144A (en) * | 2021-09-29 | 2021-12-24 | 东南大学 | Friction energy consumption rotation self-reset node device |
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