CN101798849A - Node connection device for self-centering prestressed concrete frame - Google Patents
Node connection device for self-centering prestressed concrete frame Download PDFInfo
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Abstract
The invention relates to a node connection device for a self-centering prestressed concrete frame. The node connection device is a device used for the connection between the beam and the column of a prefabricated reinforced concrete frame, and aims at improving energy consumption of a frame structure under seismic action and eliminating or reducing the residual deformation and damage of the frame structure. The connection device is characterized in that combined steel parts form an energy consuming device, two external friction steel plates (3) are arranged in the energy consuming device, are respectively and symmetrically arranged on the two sides of a column end reinforcing steel plate (4) and are connected with the column end reinforcing steel plate (4) into a whole body, two internal friction steel plates (8) are arranged between the two external friction steel plates (3), the upper end and the lower end of each internal friction steel plate (8) are respectively provided with a bean end reinforcing steel plate (5), friction discs (15) are respectively arranged between the two internal friction steel plates (8) and the two external friction steel plates (3), and friction-type high-strength bolts (12) penetrate through the external friction steel plates (3), the friction discs (15), the internal friction steel plates (8) and a prefabricated concrete beam (2) and connect all parts together.
Description
Technical field
The present invention is a kind of beam column linkage of assembled steel reinforced concrete frame, is used to the seismic energy that dissipates, and eliminates or permanent set and the damage of reduction frame construction under geological process, thereby reduces the cost that repair the shake back.
Background technology
Earthquake is one of natural calamity of facing jointly of the whole mankind.Repeatedly macroseism has over the years constituted serious threat to people's safety of life and property.Seimic disaster census both domestic and external shows that for common frame construction, the earthquake of its node area is very general.Because node area is stressed comparatively complicated, under geological process, this position often becomes the weakest link in the total system.Simultaneously, because node plays transmission, distributes internal force and assurance structural integrity in framework important function, it destroys and often will cause whole framework forfeiture bearing capacity, even structural collapse.In addition, the reparation difficulty is bigger after the shake of node area.Therefore, extremely important and meaningful at the improvement of beam column connected mode.
In traditional cast-in-place framework, structure mainly consumes energy by the plastic strain of self, has permanent set after the earthquake, brings difficulty for reparation and follow-up use.Advantages such as speed of production is fast although assembled steel reinforced concrete frame has, steady quality, saving template, the node connection reliability of traditional fabricated construction is relatively poor, and therefore the application in the earthquake zone is restricted.By whether needing the back pouring concrete, the connection of framework can be divided into " the wet connection " and " involvement connects " two kinds generally, the former uses more at present, but wet connection still needs cast-in-situ concrete, and template, support and maintenance have weakened the advantage that the prefabricated costruction speed of application is fast, cost is low greatly." involvement connects " except can obviously improving the work efficiency, be with another difference of " the wet connection ": in wet connecting frame, the plastic strain that design allows often is arranged on the zone beyond the bonding pad, and the bonding pad keeps elasticity; The framework of " involvement connects " is then made every effort to prefabricated units and is remained on elastic range, and plastic strain is controlled at bonding pad itself as far as possible, therefore compares with cast-in-place structural, and the destructiveness of " involvement connects " prefabricated concrete structure is much smaller, realizes easily repairing after the shake.But adopt a little less than the energy dissipation capacity of assembling framework of " involvement connects ", beam column relative rotation takes place in, the beam-ends concrete can go out earlier current situation crush bad, thereby influence integrally-built anti-seismic performance.
Summary of the invention
Technical problem: in order to overcome the deficiency of traditional cast-in-situ steel reinforced concrete framework and assembly concrete framework, the invention provides the nodal connection device of a kind of simplicity of design, easy to process, obvious results self-centering prestressed concrete frame, reduce the cost that repair the shake back thereby can reduce the permanent set of structure under geological process effectively.
Technical scheme: adopt prefabricate reinforced concrete beam, post, through hoisted in position, prestress wire is passed the duct of reserving in the beam column, carry out prestressed stretch-draw then through the scene.The un-bonded prestressed steel strand of posttension is the assembly unit means of construction stage, can bear the beam-ends moment of flexure in operational phase again.In order to improve the energy dissipation capacity of node, friction energy-dissipating spare is set in the beam column contact site.This part that consumes energy constitutes energy-dissipating device with the combination steel part, and this energy-dissipating device comprises that external friction steel plate, styletable are strengthened steel plate, beam-ends is strengthened steel plate, friction plate, interior friction steel plate, friction-type high-strength bolt composition; Wherein, the external friction steel plate has two, being symmetricly set in styletable respectively strengthens the both sides of steel plate and strengthens steel plate with styletable holding together, between two external friction steel plates, be provided with two interior friction steel plate, in the upper end of two interior friction steel plate with the lower end beam-ends reinforcement steel plate is set respectively, between two interior friction steel plate and external friction steel plate, be respectively equipped with friction plate, the friction-type high-strength bolt passes external friction steel plate, friction plate, interior friction steel plate and precast concrete beam, and each parts is fixed together.Strengthen welding shearing resistance peg on the steel plate at styletable.Strengthen welding shearing resistance peg on the steel plate at beam-ends.Is furnished with Belleville disc spring packing ring on the friction-type high-strength bolt.
Different with traditional fabricated construction, the beam column contact surface of self-centering framework concreting or carry out chemical grouting (seam) no longer after assembling, but the contact surface frictional force that relies on prestressing force to provide is fully born shearing.When the beam-ends moment of flexure surpasses disappearing during the press-bending square of contact surface, node opens, and steel strand stress increases thereupon.After the geological process, framework is returned to original vertical center (self-centering) under the effect of steel strand prestress, thereby eliminate (or reducing greatly) structure permanent set under geological process, but and the distortion basic controlling of agent structure such as beam column in elastic range, (can't harm).
The present invention adopts " self-centering prestressed concrete frame nodal connection device ", emphasis solves the power consumption and the concrete partial pressing of the beam-ends problem of assembling frame joint, and pass through prestressed member, make structure have self-centering function (structure automatically resets after the earthquake), eliminate or reduced the permanent set of structure effectively, guarantee the safety of agent structure under geological process, reduced the cost that repair the shake back.
In view of reinforced concrete frame being widely used in China, and the earthquake of frame joint is very general and difficulty that reinforcing is repaired is bigger, simultaneously, building standardization, industrialization and industrialization electricity are current development trends, so the application has positive social effect and scientific meaning.
Beneficial effect; After adopting the application's " self-centering prestressed concrete frame nodal connection device ", the concrete partial pressing of the power consumption of assembling frame joint and beam-ends problem will effectively be improved, thereby obtain following excellent performance:
1) has the self-centering ability, reduced the permanent set after the shake greatly;
2) damage after the shake is little, and concentrates on the attached member such as power consumption part etc., and main members such as beam column keep elasticity substantially, thereby is convenient to repair;
3) most of member can be prefabricated in the factory, and assembled on site helps accelerating construction progress, ensures the quality of products and reduces cost of labor then;
4) adopt prestressing technique, the initial stiffness of node is big;
5) vertical shear is mainly born by the friction and the power consumption member of beam column contact surface, has good structural redundancy degree; Even the part steel strand are broken, structure still can work on;
6) column cross-section size can be reduced;
Description of drawings
Further the present invention will be described below in conjunction with drawings and embodiments.
Fig. 1 is for adopting the schematic three dimensional views of apparatus of the present invention afterframe
Fig. 2 is the frame facet figure after employing apparatus of the present invention;
Fig. 3 is the sectional drawing of prefabricated post and built-in fitting thereof;
Fig. 4 is the sectional drawing of precast beam and built-in fitting thereof;
Fig. 5 is the A-A section of Fig. 1;
Fig. 6 is the B-B section of Fig. 1;
Fig. 7 for the external friction steel plate and on punch;
Fig. 8 is the deformation pattern of frame joint under severe earthquake action behind this aspect of employing device.
Have among the figure: precast concrete column 1; Precast concrete beam 2; External friction steel plate 3; Styletable is strengthened steel plate 4; Beam-ends is strengthened steel plate 5; Un-bonded prestressed steel strand 6; Shearing resistance peg 7; Interior friction steel plate 8; Spiral stirrup 9; The friction bolt hole of reserving 10; Prestress wire ground tackle 11; Friction-type high-strength bolt 12; Preformed hole 13 on the external friction steel plate; Belleville disc spring packing ring 14; Friction plate 15.
The specific embodiment
The nodal connection device of self-centering prestressed concrete frame of the present invention mainly is made up of the pre-buried steel part of beam column and friction energy consuming device two parts.
The pre-buried steel part of beam column comprises that mainly styletable is strengthened steel plate 4 and beam-ends is strengthened steel plate 5, shearing resistance peg 7, and the end of precast beam can also add spiral hoop 9.Styletable strengthens steel plate 4 and beam-ends is strengthened the local anti-pressure ability that steel plate 5 is used to improve steel concrete, shearing resistance peg 7 is welded on to be strengthened on the steel plate, be used to improve the co-operation performance of steel plate and precast unit, 9 of spiral hoops are used for providing constraint to the concrete of beam-ends, improve concrete partial pressing ability.Above-mentioned steel part is all prefabricated together at factory and precast concrete column 1, precast concrete beam 2.
Friction energy-dissipating spare constitutes energy-dissipating device with the combination steel part, and this energy-dissipating device comprises that external friction steel plate 3, styletable are strengthened steel plate 4, beam-ends is strengthened steel plate 5, friction plate 15, interior friction steel plate 8, friction-type high-strength bolt 12 compositions; Wherein, external friction steel plate 3 has two, being symmetricly set in styletable respectively strengthens the both sides of steel plate 4 and strengthens steel plate 4 with styletable holding together, between two external friction steel plates 3, be provided with two interior friction steel plate 8, in the upper end of two interior friction steel plate 8 with the lower end beam-ends reinforcement steel plate 5 is set respectively, between two interior friction steel plate 8 and external friction steel plate 3, be respectively equipped with friction plate 15, friction-type high-strength bolt 12 passes external friction steel plate 3, friction plate 15, interior friction steel plate 8 and precast concrete beam 2, and each parts is fixed together.
Wherein, friction-type high-strength bolt 12 passes the friction bolt hole 10 of reservation and through Belleville disc spring packing ring 14 external friction steel plate 3, friction plate 15 and interior friction steel plate 8 is compressed.By the prestressing force on the friction-type bolt 12, provide positive pressure perpendicular to rubbing surface.When bean column node took place under severe earthquake action by relatively rotating as shown in Figure 8, the contact surface of friction plate 15 and interior friction steel plate will be by friction dissipation seismic energy.Friction bolt hole 10 and the interior friction steel plate 8 reserved are all prefabricated together in factory and precast concrete beam 2.After frame assembled, external friction steel plate 3 and styletable are strengthened steel plate 4 welding.Reserved the hole 13 of certain diameter on the web of external friction steel plate 3 by the size of the contingent relative deformation of node, thereby guaranteed that friction-type high-strength bolt 12 is unlikely to be sheared by external friction steel plate 3 in the node deformation process.Friction plate 15 is attached to the inboard of external friction steel plate 3 or attached on the interior friction steel plate 8.
6 pairs of Vierendeel girders of the un-bonded prestressed steel strand of horizontal arrangement produce pressure and bear moment of flexure, and the shearing of beam-ends is born by the frictional force on the beam column contact surface.When the earthquake effect acquired a certain degree, the contact surface of beam column opened (as shown in Figure 8), and passed through the distortion and the power consumption of friction energy consuming device, thereby had avoided the damage of main components such as precast concrete column 1 and precast concrete beam 2.After the geological process, structure returns to original vertical position (self-centering) under the prestressing force effect.
Claims (4)
1. the nodal connection device of a self-centering prestressed concrete frame, it is characterized in that this linkage constitutes energy-dissipating device with the combination steel part, this energy-dissipating device comprises that external friction steel plate (3), styletable are strengthened steel plate (4), beam-ends is strengthened steel plate (5), friction plate (15), interior friction steel plate (8), friction-type high-strength bolt (12) composition; Wherein, external friction steel plate (3) has two, being symmetricly set in styletable respectively strengthens the both sides of steel plate (4) and strengthens steel plate (4) with styletable holding together, between two external friction steel plates (3), be provided with two interior friction steel plate (8), in the upper end of two interior friction steel plate (8) with the lower end beam-ends reinforcement steel plate (5) is set respectively, between two interior friction steel plate (8) and external friction steel plate (3), be respectively equipped with friction plate (15), friction-type high-strength bolt (12) passes external friction steel plate (3), friction plate (15), interior friction steel plate (8) and precast concrete beam (2) are fixed together each parts.
2. the nodal connection device of self-centering prestressed concrete frame according to claim 1 is characterized in that strengthening steel plate (4) at styletable goes up welding shearing resistance peg (7).
3. the nodal connection device of self-centering prestressed concrete frame according to claim 1 is characterized in that strengthening steel plate (5) at beam-ends goes up welding shearing resistance peg (7).
4. the nodal connection device of self-centering prestressed concrete frame according to claim 1 is characterized in that being furnished with Belleville disc spring packing ring (14) on the friction-type high-strength bolt (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101338144A CN101798849B (en) | 2010-03-26 | 2010-03-26 | Node connection device for self-centering prestressed concrete frame |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101338144A CN101798849B (en) | 2010-03-26 | 2010-03-26 | Node connection device for self-centering prestressed concrete frame |
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| CN101798849A true CN101798849A (en) | 2010-08-11 |
| CN101798849B CN101798849B (en) | 2011-07-20 |
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| CN2010101338144A Expired - Fee Related CN101798849B (en) | 2010-03-26 | 2010-03-26 | Node connection device for self-centering prestressed concrete frame |
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