CN220451088U - Post-tensioned bonded precast prestressed concrete open-pore beam frame structure system connected by UHPC (ultra high pressure concrete) - Google Patents
Post-tensioned bonded precast prestressed concrete open-pore beam frame structure system connected by UHPC (ultra high pressure concrete) Download PDFInfo
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- CN220451088U CN220451088U CN202121499561.2U CN202121499561U CN220451088U CN 220451088 U CN220451088 U CN 220451088U CN 202121499561 U CN202121499561 U CN 202121499561U CN 220451088 U CN220451088 U CN 220451088U
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- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 44
- 239000011148 porous material Substances 0.000 title claims abstract description 40
- 239000004567 concrete Substances 0.000 title claims description 23
- 239000011178 precast concrete Substances 0.000 claims abstract description 64
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 19
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 16
- 210000002435 tendon Anatomy 0.000 claims description 26
- 238000013461 design Methods 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 6
- 238000003475 lamination Methods 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims 2
- 238000010276 construction Methods 0.000 abstract description 18
- 238000004873 anchoring Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 238000004364 calculation method Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
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- 239000000835 fiber Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000009435 building construction Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a post-tensioned bonded precast prestressed concrete open-pore beam frame structure system connected by UHPC, which comprises a precast concrete upper column, a precast concrete lower column, a post-tensioned bonded precast prestressed concrete open-pore laminated beam, a UHPC node core area and laminated plates. The upper longitudinal main ribs extend out of the bottom surface of the prefabricated upper column and are directly anchored in the UHPC node core area, the lower longitudinal main ribs extend out of the top surface of the prefabricated lower column and are directly anchored in the UHPC node core area, and the common reinforcing steel bars extend out of the precast concrete openings Liang Duanmian and are directly anchored in the UHPC node core area. The structure system not only is convenient and quick for site construction and improves the installation efficiency of components, but also can greatly reduce the anchoring length of the reinforcing steel bars and the dosage of stirrups in the core area of the node, the method can avoid the crowding of the reinforcing steel bars in the core area of the node, reduce the section height of the component, lighten the dead weight, and improve the crack resistance and the bearing capacity of the component, thereby improving the earthquake resistance of the integral frame structure.
Description
Technical Field
The utility model relates to the technical field of prefabricated prestressed assembled building construction, in particular to a post-tensioned bonded prefabricated prestressed concrete open-pore beam frame structure system connected by UHPC (ultra high pressure concrete), and a design and construction method thereof.
Background
The cast-in-situ structure has the advantages of low construction efficiency, high energy consumption and other limitations, it is gradually difficult to adapt to the development requirements of building industrialization. The prefabricated building has become the development direction of building industrialization due to the advantages of high construction speed, industrialized production of components, field wet operation reduction, environmental pollution reduction and the like. Through years of development and popularization, prefabricated assembled concrete structures have been widely studied and used.
The prefabricated assembled concrete frame structure refers to a structure that beam column components are prefabricated in a prefabrication factory and transported to a construction site to be connected to form an integral structure. Compared with the cast-in-place concrete structure, the cast-in-place concrete structure has the advantages of high construction speed, easily guaranteed component quality, good quality, small environmental pollution, labor cost saving, a large number of templates and supports saving and the like, and is a structure form with very broad prospects. For the wet connection assembly type concrete frame structure, the node construction form which is easy to construct and effectively ensures the integrity is key to popularization and application. However, from the view of the past earthquake disasters, the assembled structure is seriously damaged in the earthquake, and the same earthquake-resistant performance as that of the cast-in-situ structure is difficult to achieve. To improve the integrity and reliability of the node connection of the fabricated concrete frame, and to achieve or even exceed the earthquake-resistant performance of the cast-in-place concrete structure, a pre-stressing technique and UHPC material (Ultra High Performance Concrete, ultra-high performance concrete) are introduced into the fabricated structure.
The post-tensioned bonded prestressed assembled concrete structure is formed by tensioning prestressed tendons and grouting, and the prefabricated components are assembled together to work together. The internal stress generated by the prestress on the concrete section can partially or completely offset the section stress under the load, delay the occurrence of cracks and improve the rigidity of the component. During unloading, the crack can be partially or completely closed, and the elastic recovery performance of the structure is good. Meanwhile, the prestressed concrete can fully utilize the material strength of the prestressed tendons and the concrete, and lighten the dead weight of the structure. And the application of the prestress is beneficial to the improvement of the usability and the integrity of the assembled structure, and the application of the assembled structure in a large-span and heavy-load structure is promoted.
UHPC has excellent bonding performance, and can greatly reduce the anchoring length of the steel bars and the steel strands in the UHPC; the strength is high, the hooping consumption of the node core area can be reduced, and the UHPC is used for the node core area, so that the structure is simple and the frame integrity is good. The pre-stress structure has excellent stress performance, and UHPC is applied to the node core area to form the pre-stress frame structure. The structure is subjected to intensive research, and is favorable for further popularization and application of the prefabricated prestressed concrete frame structure.
Disclosure of Invention
Aiming at the defects existing in the prior art and combining the excellent performance of UHPC, the utility model provides a post-tensioned bonded precast prestressed concrete open-pore beam frame structure system connected by UHPC and a design and construction method thereof. The post-tensioning combined structure combines the three traditional structures of a bonding pre-stress structure, an assembly structure and a superposition structure, and adopts UHPC high-performance materials, thereby achieving the purpose of improving the anti-seismic performance of the prefabricated assembly type concrete frame structure.
The utility model has the advantages of mainly representing the two aspects of the connection technology of the precast concrete beam column components and the steel bar connection technology between the components. In the aspect of component connection technology, beam column components are connected through UHPC with excellent performance, a UHPC node core area is formed, and the anti-seismic fortification requirements of strong-node weak components are more easily realized, so that the ductility of beam column nodes is improved, and the anti-seismic performance of the whole frame structure is improved. In the aspect of the steel bar connection technology, the steel bars between the beam column components only need simple lap joint, and the lap joint length is small, so that the manufacturing time and the field installation time of the prefabricated components are greatly saved. Therefore, the UHPC connected post-tensioned bonded precast prestressed concrete open-pore beam frame structure system and the design and construction method thereof accord with the green development strategy of building industrialization in China.
The technical problems solved by the utility model can be realized by adopting the following technical scheme:
the post-tensioned bonded precast prestressed concrete open-pore beam frame structure system connected by UHPC comprises a precast concrete upper column, a precast concrete lower column, a post-tensioned bonded precast prestressed concrete open-pore superposed beam, a UHPC node core area and a superposed plate;
an upper longitudinal main rib is arranged in the precast concrete upper column, a lower longitudinal main rib is arranged in the precast concrete lower column, a bonded precast prestressed concrete open-pore laminated beam is arranged in the post-tensioned precast concrete open-pore laminated beam, a precast concrete open-pore beam, a beam laminated layer and a bonded prestressed rib are arranged in the post-tensioned precast concrete open-pore beam, a common reinforcing steel bar is arranged at the bottom of the precast concrete open-pore beam, a hanging rib or a reinforcing steel bar net is arranged at an orifice if necessary, a welded reinforcing steel bar net can be adopted for the reinforcing steel bar net, a top through-length reinforcing steel bar is arranged in the beam laminated layer, and the laminated plate consists of a precast concrete slab and a plate laminated layer poured on a plate;
the upper longitudinal main ribs extend out of the bottom surface of the prefabricated upper column and are directly anchored in the UHPC node core area, the lower longitudinal main ribs extend out of the top surface of the prefabricated lower column and are directly anchored in the UHPC node core area, and the common reinforcing steel bars extend out of the precast concrete openings Liang Duanmian and are directly anchored in the UHPC node core area;
the post-tensioned bonded precast prestressed concrete open-pore superposed beam also comprises a full precast prestressed concrete open-pore beam; the bonded prestressed tendons comprise straight lines, broken lines and curved prestressed tendons;
the bonded prestressed tendons can be bonded, bonded or partially bonded, unbonded or unbonded in the node core area;
the post-tensioning bonded precast prestressed concrete perforated laminated beam is subjected to construction checking calculation according to a force transmission mode which is suitable for the ordinary concrete perforated simple beam and the support arrangement before a beam laminated layer, a plate laminated layer and a UHPC node core area are poured, after the node core area, the beam laminated layer and the plate laminated layer are poured, the concrete strength of the node and the laminated layer meets the design requirement, the bonded prestressed tendons are tensioned, the support is removed after the tensioning is finished, and the construction phase checking calculation is carried out according to the unbonded frame beam; the post-tensioned bonded precast prestressed concrete perforated laminated beam is different in section of an upper chord at an orifice before casting a beam laminated layer, a plate laminated layer and a UHPC node core area and is different in stress state after casting, and construction checking is carried out on the upper chord and the lower chord at the orifice of the precast concrete perforated beam; there are bonded and unbonded portions of the node core area, in the normal use limit state, the calculation is carried out according to the effective prestress, and in the limit load bearing limit state, considering the stress increment of the unbonded tendons, and considering the recovery performance provided by the unbonded tendons under the earthquake load.
Further, the post-tensioned bonded precast prestressed concrete open-pore laminated beam consists of a precast concrete open-pore beam, a beam laminated layer and post-tensioned bonded prestressed tendons.
Further, the post-tensioned bonded prestressed tendons are arranged in the corrugated pipes pre-buried in the precast concrete perforated beam member, penetrate through the beam lamination layer and the corrugated pipes pre-buried in the UHPC node core area, and extend out of the UHPC node core area from two ends, and the two ends of the post-tensioned bonded prestressed tendons are fixedly provided with clamps and anchors respectively.
Further, the bottom surface of the precast concrete upper column, the top surface of the precast concrete lower column and the end surface of the post-tensioned bonded precast prestressed concrete open-pore superposed beam are all provided with inward concave grooves.
Further, the precast concrete upper column is fixed at the corresponding position by a reliable support.
Further, stirrups in the prefabricated concrete upper column, the prefabricated concrete lower column and the post-tensioned bonded prefabricated prestressed concrete open-pore laminated beam are divided into an encryption area and a non-encryption area, stirrups in a UHPC node core area are arranged according to design requirements, a shear-resistant bearing capacity in the core area is calculated according to a compression rod and a truss model, steel fibers in the UHPC are equivalent to horizontal stirrups and vertical longitudinal ribs, the contribution of the steel fibers to the shear resistance of the node core area is considered, and meanwhile the beneficial contribution of the bonded prestressed ribs to the shear resistance of the node is considered.
Further, the precast concrete perforated beam and the top surface of the precast concrete slab are provided with a fur layer.
Compared with the prior art, the utility model has the advantages that:
1. the utility model combines the prefabricated concrete structure with the post-tensioned bonded prestressed structure, and improves the service performance of the structure, reduces the section height of the component, lightens the dead weight, improves the cracking resistance of the component and self-restores the advantages of the integral frame structure by utilizing the advantages of the prefabricated structure, such as convenient and quick construction, good construction quality, energy conservation and environmental protection. The unbonded prestressed tendons in the core area of the node provide self-resetting capability for the structure, enhance the integrity and the structural toughness of the structure and reduce the repair cost after earthquake.
2. The UHPC material with excellent performance is adopted and applied to the node core area, so that the reliable connection of the precast beam column components can be realized, the bearing capacity and the anti-seismic performance of the node can be improved, the anchoring length of the steel bars and the steel strands can be greatly reduced, the amount of stirrups in the node core area can be remarkably reduced, the crowding of the steel bars in the node core area is avoided, and the manufacturing, transporting and installing efficiency of the precast beam column components is greatly improved.
Drawings
FIG. 1 is a schematic structural diagram of a UHPC-based precast prestressed concrete open-cell beam frame structure system of the present utility model
FIG. 2 is a schematic view of a two-span frame structure of the present utility model
FIG. 3 is a schematic view of a two-truss frame construction material according to the present utility model
FIG. 4 is a detailed view of the intermediate layer frame edge node construction of the present utility model
FIG. 5 is an isometric view of an intermediate layer frame edge node of the present utility model
FIG. 6 is a detailed view of the construction of nodes in the intermediate layer frame of the present utility model
FIG. 7 is an isometric view of a node in the middle layer frame of the present utility model
Detailed Description
So that the manner in which the features, objects and advantages of the utility model are attained, the utility model is further described with reference to the drawings and detailed description.
As shown in fig. 1-7, the post-tensioned bonded precast prestressed concrete open-pore beam frame structure system for UHPC connection comprises a precast concrete upper column 1, a precast concrete lower column 2, a post-tensioned bonded precast prestressed concrete open-pore composite beam 3, a UHPC node core region 4 and a composite slab 17;
an upper longitudinal main rib 5 is arranged in the precast concrete upper column 1, a lower longitudinal main rib 6 is arranged in the precast concrete lower column 2, a post-tensioned bonding precast prestressed concrete open-pore laminated beam 3 is internally provided with a precast concrete open-pore beam 7 and a beam laminated layer 8, a post-tensioned bonding prestressed rib 9 is arranged, the bottom of the precast concrete open-pore beam 7 is provided with a common reinforcing steel bar 10, a top through long reinforcing steel bar 11 is arranged in the beam laminated layer 8, and the laminated plate 17 consists of a precast concrete slab 18 and a plate laminated layer 19 poured on the plate;
the upper longitudinal main ribs 5 extend out of the bottom surface of the precast concrete upper column 1 and are directly anchored in the UHPC node core area 4, the lower longitudinal main ribs 6 extend out of the top surface of the precast concrete lower column 2 and are directly anchored in the UHPC node core area 4, and the common reinforcing steel bars 10 extend out of the end surface of the precast concrete perforated beam 7 and are directly anchored in the UHPC node core area 4;
the post-tensioned bonded precast prestressed concrete open-pore superposed beam 3 also comprises a full precast prestressed concrete open-pore beam; the bonded prestressed tendons 9 comprise straight lines, broken lines and curved prestressed tendons;
the bonded prestressed tendons 9 can be bonded, bonded or partially bonded or unbonded in the node core area 4;
the post-tensioned bonded precast prestressed concrete perforated laminated beam 3 is constructed and checked according to a force transmission mode which is suitable for the ordinary concrete perforated simple beam and the support setting before a beam laminated layer 8, a plate laminated layer 19 and a UHPC node core area 4 are poured, after the node core area 4, the beam laminated layer 8 and the plate laminated layer 19 are poured, the concrete strength of the node and the laminated layer meets the design requirement, the bonded prestressed tendons 9 are tensioned, the support is removed after the tensioning is completed, and the construction stage checking calculation is carried out according to the unbonded frame beam; the post-tensioned bonded precast prestressed concrete perforated laminated beam is different in section of an upper chord at an orifice before casting a beam laminated layer, a plate laminated layer and a UHPC node core area and is different in stress state after casting, and construction checking is carried out on the upper chord and the lower chord at the orifice of the precast concrete perforated beam; the node core area is bonded, unbonded and unbonded, and is calculated according to effective prestress in a normal use limit state, stress increment of unbonded tendons is considered in a limit bearing limit state, and recovery performance provided by the unbonded tendons is considered in an earthquake load;
the post-tensioned bonded precast prestressed concrete open-pore laminated beam 3 consists of a precast concrete open-pore beam 7, a beam laminated layer 8 and post-tensioned bonded prestressed tendons 9; the superimposed sheet 17 consists of a precast concrete panel 18 and a sheet laminate 19 poured on the panel;
the post-tensioned bonded prestressed tendons 9 are arranged in the corrugated pipes pre-buried in the precast concrete perforated beam 7 member, penetrate through the beam lamination layer 8 and the corrugated pipes pre-buried in the UHPC node core region 4, and extend out of the UHPC node core region 4 from two ends, and a clamp 15 and an anchor 16 are respectively and fixedly arranged at two ends of the post-tensioned bonded prestressed tendons;
the bottom surface of the precast concrete upper column 1, the top surface of the precast concrete lower column 2 and the end surface of the post-tensioned bonded precast prestressed concrete open-pore superposed beam 3 are provided with inward concave grooves;
the precast concrete perforated beam 7 is provided with hanging ribs 20 and reinforcing steel meshes 21 around the orifice;
the precast concrete upper column 1 is fixed at a corresponding position by a reliable support 12;
the method comprises the steps that a precast concrete upper column 1, a precast concrete lower column 2 and a non-encrypted stirrup 13 in a post-tensioned bonded precast prestressed concrete open-pore superposed beam 3 are divided into an encrypted area and a non-encrypted area, the encrypted stirrup 14 in a UHPC node core area 4 is arranged according to design requirements, the shearing resistance bearing capacity of the core area is calculated according to a diagonal compression bar and truss model, steel fibers in the UHPC are equivalent to horizontal stirrups and vertical longitudinal ribs, the shearing resistance contribution of the steel fibers to the node core area is considered, and the shearing resistance contribution of the bonded prestressed ribs to the nodes is considered;
the precast concrete aperture beam 7 and the top surface of the precast concrete panel 18 are provided with a fur layer.
While the utility model has been described above by way of example only, it will be apparent that the utility model is not limited to the particular embodiments described, i.e., it is not limited thereto, but is susceptible to various modifications, changes or substitutions without departing from the spirit and scope of the present utility model.
Claims (7)
1. The post-tensioned bonded precast prestressed concrete open-pore beam frame structure system connected by UHPC comprises a precast concrete upper column (1), a precast concrete lower column (2), a post-tensioned bonded precast prestressed concrete open-pore superposed beam (3), a UHPC node core area (4) and a superposed plate (17);
the concrete pile is characterized in that an upper longitudinal main rib (5) is arranged in a precast concrete upper column (1), a lower longitudinal main rib (6) is arranged in a precast concrete lower column (2), a precast concrete open-pore beam (7), a beam overlapping layer (8) and a binding prestressed rib (9) are arranged in a post-tensioned binding precast prestressed concrete open-pore laminated beam (3), a common reinforcing steel bar (10) is arranged at the bottom of the precast concrete open-pore beam (7), hanging ribs (20) and reinforcing steel bar meshes (21) are arranged around an orifice, a top through-length reinforcing steel bar (11) is arranged in the beam overlapping layer (8), and a laminated slab (17) consists of a precast concrete slab (18) and a slab overlapping layer (19) poured on the slab;
the upper longitudinal main rib (5) extends out of the bottom surface of the precast concrete upper column (1) and is directly anchored in the UHPC node core area (4), the lower longitudinal main reinforcement (6) extends out of the top surface of the precast concrete lower column (2) and is directly anchored in the UHPC node core area (4), and the common reinforcement (10) extends out of the end surface of the precast concrete perforated beam (7) and is directly anchored in the UHPC node core area (4);
the post-tensioned bonded precast prestressed concrete open-pore superposed beam (3) also comprises a full-precast prestressed concrete open-pore beam; the bonded prestressed tendons (9) comprise straight-line, broken-line and curved-shaped prestressed tendons;
after the UHPC node core area (4), the beam lamination layer (8) and the plate lamination layer (19) are poured, the concrete strength of the node and the lamination layer reach the design requirement, the stretching of the bonded prestressed tendons (9) is carried out, and after the stretching is finished, the support is removed.
2. The post-tensioned bonded precast prestressed concrete open-cell beam frame structure system of a UHPC connection according to claim 1, wherein the post-tensioned bonded precast prestressed concrete open-cell composite beam (3) consists of a precast concrete open-cell beam (7), a beam composite layer (8) and post-tensioned bonded prestressed tendons (9); the laminated slab (17) consists of a precast concrete slab (18) and a slab laminated layer (19) poured on the slab.
3. The post-tensioned bonded precast prestressed concrete open-pore beam frame structure system of the UHPC connection according to claim 1, wherein the post-tensioned bonded prestressed tendons (9) are arranged in the pre-buried corrugated pipes in the precast concrete open-pore beam (7) component, penetrate through the corrugated pipes pre-buried in the beam lamination layer (8) and the UHPC node core area (4) and extend out of the UHPC node core area (4) from two ends, and a clamp (15) and an anchor (16) are fixedly arranged at two ends respectively.
4. The post-tensioned bonded precast prestressed concrete open-cell beam frame structure system of claim 1, wherein the bottom surface of the precast concrete upper column (1), the top surface of the precast concrete lower column (2) and the end surface of the post-tensioned bonded precast prestressed concrete open-cell composite beam (3) are provided with concave grooves.
5. UHPC-connected post-tensioned bonded precast prestressed concrete open-cell beam frame structure system according to claim 1, characterized by the fact that the precast concrete upper column (1) is fixed in the corresponding position with a reliable support (12).
6. The post-tensioned bonded precast prestressed concrete open-cell beam frame structure system of a UHPC connection according to claim 1, wherein the precast concrete upper column (1), the precast concrete lower column (2) and the post-tensioned bonded precast prestressed concrete open-cell composite beam (3) are provided with non-encrypted stirrups (13), and the encrypted stirrups (14) in the UHPC node core area (4) are arranged according to design requirements.
7. The post-tensioned bonded precast prestressed concrete open-cell beam frame structure system of claim 1 wherein the top surfaces of said precast concrete open-cell beam (7) and said precast concrete panel (18) are provided with a batt.
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| CN202121499561.2U CN220451088U (en) | 2021-06-30 | 2021-06-30 | Post-tensioned bonded precast prestressed concrete open-pore beam frame structure system connected by UHPC (ultra high pressure concrete) |
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| CN202121499561.2U CN220451088U (en) | 2021-06-30 | 2021-06-30 | Post-tensioned bonded precast prestressed concrete open-pore beam frame structure system connected by UHPC (ultra high pressure concrete) |
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