CN115538576B - A UHPC-connected post-tensioned loosely bonded precast prestressed concrete perforated beam frame structure system and its design and construction method - Google Patents
A UHPC-connected post-tensioned loosely bonded precast prestressed concrete perforated beam frame structure system and its design and construction methodInfo
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- CN115538576B CN115538576B CN202110734256.5A CN202110734256A CN115538576B CN 115538576 B CN115538576 B CN 115538576B CN 202110734256 A CN202110734256 A CN 202110734256A CN 115538576 B CN115538576 B CN 115538576B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- 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
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional [3D] framework structures
- E04B1/1903—Connecting nodes specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- 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
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/21—Connections specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- 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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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
- E04C3/26—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members prestressed
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
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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
- E04H9/025—Structures with concrete columns
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Abstract
本发明公开了一种UHPC连接的后张缓粘结预制预应力混凝土开孔梁框架结构体系，包括预制混凝土上柱、预制混凝土下柱、后张缓粘结预制预应力混凝土开孔叠合梁、UHPC节点核心区和叠合板。所述上纵向主筋伸出预制上柱底面，下纵向主筋伸出预制下柱顶面，普通钢筋伸出预制混凝土梁端面均直接锚固在UHPC节点核心区内。该结构体系不仅现场施工方便快速、提高构件安装效率，而且既能大幅度减少钢筋锚固长度，大幅减少节点核心区箍筋用量，避免节点核心区钢筋拥挤，又能减小构件截面高度，减轻自重、提高构件抗裂性能和自恢复性能，从而改善整体框架结构的抗震性能。后张缓粘结具有耐久性好的优势，且解决了后张有粘结灌浆不密实的缺点。
This invention discloses a post-tensioned, loosely bonded precast prestressed concrete perforated beam frame structure system with UHPC (Ultra-High-Pressure Polymer) connection, comprising a precast concrete upper column, a precast concrete lower column, a post-tensioned, loosely bonded precast prestressed concrete perforated composite beam, a UHPC node core area, and a composite slab. The upper longitudinal main reinforcement extends from the bottom surface of the precast upper column, the lower longitudinal main reinforcement extends from the top surface of the precast lower column, and ordinary steel bars extend from the end face of the precast concrete beam, all directly anchored within the UHPC node core area. This structural system not only facilitates and expedites on-site construction, improving component installation efficiency, but also significantly reduces the anchorage length of the reinforcement, substantially reduces the amount of stirrups in the node core area, avoids reinforcement congestion in the node core area, reduces the component cross-sectional height, lightens the self-weight, and improves the component's crack resistance and self-healing performance, thereby improving the overall seismic performance of the frame structure. Post-tensioned, loosely bonded grouting offers the advantage of good durability and overcomes the disadvantage of incomplete grouting in post-tensioned bonding.
Description
Technical Field
The invention relates to the technical field of prefabricated prestressed assembled building construction, in particular to a post Zhang Huan bonded prefabricated prestressed concrete open-pore beam frame structure system connected by UHPC, and a design and construction method thereof.
Background
The cast-in-situ structure has the defects of low construction efficiency, high energy consumption and the like, and is 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. In order to improve the integrity and reliability of the node connection of the fabricated concrete frame and achieve and even exceed the earthquake-resistant performance of the cast-in-place concrete structure, a pre-stress technology and UHPC material (Ultra High Performance Concrete, ultra-high performance concrete) are introduced into the fabricated structure.
The rear Zhang Huan bonding prestressed assembled concrete structure is formed by splicing prefabricated components together through tensioning prestressed tendons and has the characteristics of a post-tensioning and slow bonding prestressed concrete structure and an assembled structure. 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.
The UHPC has excellent bonding performance, can greatly reduce the anchoring length of the steel bars and the steel strands in the UHPC, has high strength, can reduce the hooping consumption of the node core area, and can lead the structure to be simple and the frame to have good integrity when being used in the node core area. 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 invention provides a post Zhang Huan bonding precast prestressed concrete open-pore beam frame structure system connected by UHPC and a design and construction method thereof. The structure combines the rear Zhang Huan bonding prestressed structure, the assembled structure and the superposed structure, and adopts UHPC high-performance materials, thereby achieving the purpose of improving the earthquake resistance of the prefabricated assembled concrete frame structure.
The invention has the advantages of mainly representing two aspects of the connection technology of the precast concrete open-pore 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 rear Zhang Huan 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 invention can be realized by adopting the following technical scheme:
A post Zhang Huan bonding 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 Zhang Huan bonding 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 precast concrete perforated beam, a beam overlapping layer and a rear Zhang Huan binding prestressed rib are arranged in the rear Zhang Huan binding precast prestressed concrete perforated beam, a common reinforcing steel bar is arranged at the bottom of the precast concrete perforated beam, a hanging rib and a reinforcing steel bar net sheet can be arranged around an orifice if necessary, a welded reinforcing steel bar net can be adopted for the reinforcing steel bar net sheet, a top through length reinforcing steel bar is arranged in the beam overlapping layer, and the overlapping plate consists of a precast concrete slab and a plate overlapping layer poured on the 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 slow-bonding prestressed tendons comprise straight lines, broken lines and curved prestressed tendons;
the slow-bonding prestressed tendons can be bonded, bonded or partially bonded, unbonded or unbonded in the node core area;
The post Zhang Huan bonding precast prestressed concrete perforated laminated beam is constructed and checked according to a force transmission mode which is suitable for the arrangement of a simple beam with a common concrete perforated and a support before a beam laminated layer, a plate laminated layer and a UHPC node core area are poured, the concrete strength of the node and the laminated layer reaches the design requirement after the node core area, the beam laminated layer and the plate laminated layer are poured, the stretching of the slow bonding prestressed tendons is carried out, the support is removed after the stretching is finished, the construction stage checking is carried out according to a frame beam, the sections of the upper chord members of the precast prestressed concrete perforated laminated beam at the positions of the orifices are different from the sections of the upper chord members and the lower chord members of the precast concrete perforated beam at the positions of the orifices after the beam laminated layer, the plate laminated layer and the UHPC node core area are poured, the stress states are different, the construction checking is carried out according to unbonded prestressed tendons when the construction checking is carried out, and the calculation is carried out according to bonded prestressed tendons when the limit state and the limit state of bearing capacity is normally used.
Further, the rear Zhang Huan bonded precast prestressed concrete open-pore composite beam consists of a precast concrete open-pore beam, a beam composite layer and rear Zhang Huan bonded prestressed tendons.
Further, the rear Zhang Huan binding prestressed tendons are pre-buried in the precast concrete perforated beam member according to the design position, penetrate through the UHPC node core area, extend out of the UHPC node core area from two ends, are fixedly provided with a clamp and an anchor respectively, one end of each binding prestressed tendon is arranged on the outer side of the column, and the other end of each binding prestressed tendon is arranged in the beam overlapping layer.
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 rear Zhang Huan 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 precast concrete upper column, the precast concrete lower column and the rear Zhang Huan bonded precast 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 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 the shearing-resistant beneficial contribution of the slow bonded prestressed ribs to 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.
The invention also provides a design method of the system, which comprises the following steps:
step 1, designing beams and columns according to the existing specifications and invention patents;
step 2, checking and calculating the strength of an upper chord and a lower chord at the orifice of the precast concrete perforated beam before pouring a beam lamination layer, a plate lamination layer and a UHPC node core area of the precast prestressed concrete perforated laminated beam;
And 3, the position of the opening in the prefabricated prestressed concrete open-pore laminated beam is positioned in a midspan 1/3 section as much as possible, and when the position is positioned in a beam end 1/3 section, the distance from the edge of the hole close to the node to the inner edge of the node is larger than 1.5 times of the height of the beam.
A post Zhang Huan bonded precast prestressed concrete open-cell beam frame structure system for UHPC connection, comprising the steps of:
the method comprises the steps of 1, manufacturing a precast concrete lower column, a precast concrete upper column, a precast concrete perforated beam and a precast concrete slab, wherein the precast concrete lower column and the precast concrete upper column are reserved and extended longitudinal main reinforcements are anchored into a node core area to meet the requirement of anchoring length;
step 2, after the prefabricated component is maintained, hoisting a precast concrete lower column, mounting the precast concrete lower column on a foundation, and mounting a sufficient number of stirrups on a longitudinal main reinforcement extending out of the lower column;
Hoisting the precast concrete perforated beam to the top surface of the precast concrete lower column, enabling the bottom surface of the precast concrete perforated beam to be flush with the top surface of the precast concrete lower column, enabling the end part of the precast concrete perforated beam to be put on the precast concrete lower column and fixed by a support, wherein common reinforcing steel bars extending out of the precast concrete perforated beams at two sides are reasonably avoided and directly anchored in a node core area according to construction requirements;
hoisting the precast concrete upper column to the position right above the precast concrete lower column, and fixing the precast concrete upper column at a corresponding position by reliable support, and binding the stirrups installed in the step 2 with column longitudinal ribs at the moment, wherein the longitudinal ribs extending out of the precast concrete upper column and the precast concrete lower column are reasonably avoided in a node core area and directly anchored;
Step 5, enabling the through-length steel bars at the top to pass through the reserved stirrups and the node core area in the beam overlapping layer area and binding, then binding the pre-embedded and extended slow-bonding prestressed bars in the precast concrete perforated beam at the node core area according to the designed position, sleeving a non-bonding part of the node on the slow-bonding bars, then pouring a UHPC node core area, and setting a template so that the UHPC cannot enter the beam overlapping layer area;
step 6, after maintaining the UHPC node core area to a sufficient strength, hoisting the precast concrete slab (or the superimposed sheet, the double T plate and the secondary beam) onto the precast concrete perforated beam, and fixing the precast concrete perforated beam;
step 7, pouring a beam laminated layer and a plate laminated layer;
Step 8, stretching the slow-bonding prestressed tendons;
And 9, repeating the manufacturing process to finish the post-tensioning slow-bonding precast prestressed concrete open-pore beam frame structure system.
Compared with the prior art, the invention has the advantages that:
1. The invention combines the prefabricated concrete structure with the rear Zhang Huan bonding prestressed structure, and utilizes the advantages of convenient and quick construction, good construction quality, energy conservation and environmental protection of the prefabricated structure, and the combined rear Zhang Huan bonding prestressed structure can improve the service performance of the structure, reduce the section height of the component, lighten the dead weight, improve the cracking resistance of the component and the self-recovery, thereby improving the anti-seismic performance of the whole frame structure. The post Zhang Huan bonding has the advantage of good durability, and solves the defect of non-compact post-tensioned bonding grouting. 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 invention
FIG. 2 is a schematic view of a two-span frame structure of the present invention
FIG. 3 is a schematic view of a two-truss frame construction material according to the present invention
FIG. 4 is a detailed view of the intermediate layer frame edge node construction of the present invention
FIG. 5 is an isometric view of an intermediate layer frame edge node of the present invention
FIG. 6 is a detailed view of the construction of nodes in the intermediate layer frame of the present invention
FIG. 7 is an isometric view of a node in the middle layer frame of the present invention
Detailed Description
So that the manner in which the features, objects, and advantages of the invention can be better understood, a more particular description of the invention, briefly summarized below, may be had by reference to the appended drawings.
As shown in fig. 1-7, the rear Zhang Huan 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 rear Zhang Huan 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 precast concrete open-pore laminated beam (7) and a beam laminated layer (8) are arranged in the rear Zhang Huan bonded precast prestressed concrete open-pore laminated beam (3), a rear Zhang Huan bonded prestressed rib (9), a common reinforcing steel bar (10) is arranged at the bottom of the precast concrete open-pore beam (7), a top through-length reinforcing steel bar (11) is arranged in the beam laminated layer (8), and the laminated slab (17) consists of a precast concrete slab (18) and a slab laminated layer (19) poured on the slab;
The upper longitudinal main ribs (5) extend out of the bottom surface of the prefabricated 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 prefabricated 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 slow-bonding prestressed tendons (9) comprise straight-line, broken-line and curved-shaped prestressed tendons;
The slow-bonding prestressed tendons (9) can be bonded, bonded or partially bonded and unbonded in the node core area;
The back Zhang Huan is used for bonding the prefabricated prestressed concrete open-pore laminated beam (3) and carrying out construction checking calculation according to a force transmission mode which is suitable for the arrangement of a simple beam with a common concrete open-pore and a support before the beam laminated layer (8), the plate laminated layer (19) and the 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 stretching of the slow-bonding prestressed tendons (9) is carried out, after the stretching is finished, the support is removed, the construction phase checking calculation is carried out according to the frame beam, the section of an upper chord member of the prefabricated prestressed concrete open-pore laminated beam is different from the section of an upper chord member at an orifice after the beam laminated layer, the plate laminated layer and the UHPC node core area are poured, the stress state is different, the construction checking calculation is carried out on the upper chord member and the lower chord member at the orifice of the prefabricated concrete open-pore beam, the construction checking calculation is carried out according to unbonded prestressed tendons when the construction checking calculation is carried out, and the construction checking calculation is carried out according to the unbonded prestressed tendons are carried out in a normal use limit state and a bearing limit state;
The rear Zhang Huan bonding precast prestressed concrete perforated laminated beam (3) consists of a precast concrete perforated beam (7), a beam laminated layer (8) and rear Zhang Huan bonding prestressed tendons (9), wherein the laminated slab (17) consists of a precast concrete slab (18) and a slab laminated layer (19) poured on the slab;
the rear Zhang Huan bonding prestressed tendons (9) are pre-buried in the precast concrete perforated beam (7) component according to the designed position, penetrate through the UHPC node core area (4) and extend out of the UHPC node core area (4), a clamp (15) and an anchorage device (16) are respectively fixedly arranged at two ends of the rear Zhang Huan bonding prestressed tendons, one end of each of the rear Zhang Huan bonding prestressed tendons is arranged at the outer side of a column, and the other end of each of the rear Zhang Huan bonding prestressed tendons is arranged in a beam overlapping layer;
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 rear Zhang Huan bonded precast prestressed concrete open-pore superposed beam (3) are all provided with inward concave grooves;
the precast concrete upper column (1) is fixed at a corresponding position by a reliable support (12);
the method comprises the steps that stirrups (13) in a prefabricated concrete upper column (1), a prefabricated concrete lower column (2) and a rear Zhang Huan bonded prefabricated prestressed concrete open-pore superposed beam (3) are divided into an encryption area and a non-encryption area, stirrups (14) in a UHPC node core area (4) are arranged according to design requirements, shear-resistant 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, contribution of the steel fibers to shear resistance of a node core area is considered, and meanwhile shearing-resistant beneficial contribution of a slow bonded prestressed rib to a node is considered;
the top surfaces of the precast concrete perforated beam (7) and the precast concrete slab (18) are provided with a fur layer.
The anti-seismic design of the system comprises the following steps:
step 1, designing beams and columns according to the existing specifications and invention patents;
Step 2, checking and calculating the strength of an upper chord at an orifice of the precast concrete perforated beam before pouring a beam lamination layer, a plate lamination layer and a UHPC node core area of the precast prestressed concrete perforated laminated beam;
And 3, the position of the opening in the prefabricated prestressed concrete open-pore laminated beam is positioned in a midspan 1/3 section as much as possible, and when the position is positioned in a beam end 1/3 section, the distance from the edge of the hole close to the node to the inner edge of the node is larger than 1.5 times of the height of the beam.
A post Zhang Huan bonded precast prestressed concrete open-cell beam frame structure system for UHPC connection, comprising the steps of:
The method comprises the steps of 1, manufacturing a precast concrete lower column (2), a precast concrete upper column (1), a precast concrete perforated beam (7) and a precast concrete slab (18), wherein the precast concrete lower column (2) and the precast concrete upper column (1) are reserved to be anchored into a node core area (4) by a longitudinal main reinforcement which extends out of the precast concrete upper column, the requirement of anchoring length is required to be met, the precast concrete perforated beam (7) is reserved to be anchored into the node core area (4) by a common reinforcement (10) which extends out of the precast concrete perforated beam, the slow-bonding prestressed tendons (9) are pre-buried at design positions when the precast concrete perforated beam (7) is manufactured, and enough lengths are reserved at two ends for facilitating later tensioning;
Step 2, after the prefabricated component is cured, hoisting a precast concrete lower column (2) and installing the precast concrete lower column on a foundation, and installing enough stirrups (14) on a longitudinal main rib (6) extending out of the lower column (2);
Hoisting the precast concrete perforated beam (7) to the top surface of the precast concrete lower column (2), enabling the bottom surface of the precast concrete perforated beam (7) to be flush with the top surface of the precast concrete lower column (2), enabling the end part of the precast concrete perforated beam (7) to be put on the precast concrete lower column (2) and fixed by supporting, wherein common steel bars (10) extending out of the precast concrete perforated beams (7) at two sides are reasonably avoided in a node core area according to construction requirements and are directly anchored;
Hoisting the precast concrete upper column (1) to the position right above the precast concrete lower column (2), and fixing the precast concrete upper column (1) at a corresponding position by using a reliable support (12), and binding stirrups (14) installed in the step 2 with column longitudinal ribs at the moment, wherein the longitudinal ribs extending from the precast concrete upper column and the precast concrete lower column are reasonably avoided in a node core area and are directly anchored;
Step 5, penetrating a stirrup (13) reserved in a beam overlapping layer area and a node core area (4) through a long reinforcing bar (11) at the top and binding, binding a pre-embedded and extended slow-bonding prestressed bar (9) in a precast concrete perforated beam at the node core area according to a design position, sleeving a non-bonding part of a node on the slow-bonding bar, pouring a UHPC node core area (4), and setting a template so that the UHPC cannot enter the beam overlapping layer (8);
step 6, after the UHPC node core area (4) is cured to have enough strength, hoisting the precast concrete flat plate (or the superimposed sheet, the double T plate and the secondary beam) (18) to the precast concrete open-pore beam (7) and fixing;
7, pouring a beam laminated layer (8) and a plate laminated layer (19);
step 8, stretching the slow-bonding prestressed tendons (9);
And 9, repeating the manufacturing process to finish the post-tensioning slow-bonding precast prestressed concrete open-pore beam frame structure system.
Claims (7)
1. The rear Zhang Huan 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 rear Zhang Huan bonded precast prestressed concrete open-pore laminated beam (3), a UHPC node core area (4) and a laminated slab (17);
the concrete pile is characterized in that an upper longitudinal main rib (5) is arranged in an upper precast concrete column (1), a lower longitudinal main rib (6) is arranged in a lower precast concrete column (2), a precast concrete open-pore beam (7), a beam laminated layer (8) and a rear Zhang Huan bonding prestressed rib (9) are arranged in a rear Zhang Huan bonding 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, the reinforcing steel bar meshes are welded reinforcing steel bars meshes, a top through-length reinforcing steel bar (11) is arranged in a beam laminated layer (8), and a laminated plate (17) consists of a precast concrete slab (18) and a plate laminated layer (19) poured on the slab;
The upper longitudinal main ribs (5) extend out of the bottom surface of the prefabricated 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 prefabricated 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 slow-bonding prestressed tendons (9) comprise linear, broken line and curve-shaped prestressed tendons, and are characterized in that the slow-bonding prestressed tendons (9) are bonded, bonded or partially bonded and unbonded in a node core area;
The back Zhang Huan is used for bonding the prefabricated prestressed concrete open-pore laminated beam (3) and carrying out construction checking calculation according to a force transmission mode which is suitable for the arrangement of a simple beam with a common concrete open-pore and a support before the beam laminated layer (8), the plate laminated layer (19) and the 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 stretching of the slow-bonding prestressed tendons (9) is carried out, after the stretching is finished, the support is removed, the construction phase checking calculation is carried out according to the frame beam, the section of an upper chord member of the prefabricated prestressed concrete open-pore laminated beam is different from the section of an upper chord member at an orifice after the beam laminated layer, the plate laminated layer and the UHPC node core area are poured, the stress state is different, the construction checking calculation is carried out on the upper chord member and the lower chord member at the orifice of the prefabricated concrete open-pore beam, the construction checking calculation is carried out according to unbonded prestressed tendons when the construction checking calculation is carried out, and the construction checking calculation is carried out according to the unbonded prestressed tendons are carried out in a normal use limit state and a bearing limit state;
The rear Zhang Huan bonding prestressed tendons (9) are pre-buried in the precast concrete perforated beam (7) component according to the designed position, penetrate through the UHPC node core area (4) and extend out of the UHPC node core area (4), a clamp (15) and an anchorage device (16) are respectively fixedly arranged at two ends of the rear Zhang Huan bonding prestressed tendons, one end of each of the rear Zhang Huan bonding prestressed tendons is arranged at the outer side of a column, and the other end of each of the rear Zhang Huan bonding prestressed tendons is arranged in a beam overlapping layer;
The edge node, the middle node and the corner node core areas of the rear Zhang Huan bonding precast prestressed concrete open-pore beam frame structure system are UHPC node core areas (4);
The stirrups in the UHPC node core area (4) are arranged according to the design requirement, the shearing resistance bearing capacity of the core area is calculated by taking the steel fibers in the UHPC into consideration to be equivalent to the horizontal stirrups and the vertical longitudinal ribs, the contribution of the steel fibers to the shearing resistance of the node core area is taken into consideration, and meanwhile the beneficial contribution of the slow-bonding prestressed ribs to the shearing resistance of the node is taken into consideration;
The construction method of the rear Zhang Huan bonded precast prestressed concrete open-pore beam frame structure system comprises the following steps:
The end part of the precast concrete perforated beam (7) is put on the precast concrete lower column (2), the precast concrete upper column (1) is hoisted to the position right above the precast concrete lower column (2), and the area enclosed between the precast concrete perforated beam and the precast concrete lower column and between the precast concrete upper column is a UHPC node core area.
2. The UHPC connected rear Zhang Huan bonded precast prestressed concrete open cell beam frame structure system of claim 1, wherein the rear Zhang Huan bonded precast prestressed concrete open cell composite beam (3) is composed of a precast concrete open cell beam (7), a beam composite layer (8) and a rear Zhang Huan bonded prestressed tendon (9), and the composite slab (17) is composed of a precast concrete slab (18) and a slab composite layer (19) poured on the slab.
3. The post Zhang Huan bonded precast prestressed concrete open-cell beam frame structure system of a UHPC connection according to 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 Zhang Huan bonded precast prestressed concrete open-cell composite beam (3) are all provided with recessed grooves.
4. The UHPC connected rear Zhang Huan bonded precast prestressed concrete open cell beam frame structure system of claim 1, wherein stirrups in the precast concrete upper column (1), precast concrete lower column (2), rear Zhang Huan bonded precast prestressed concrete open cell composite beam (3) are divided into an encrypted area and a non-encrypted area.
5. The UHPC joined rear Zhang Huan bonded precast prestressed concrete open-cell beam frame structure system according to claim 1, characterized in that the top surfaces of the precast concrete open-cell beam (7) and the precast concrete panel (18) are provided with a wool top layer.
6. A method of designing a post-Zhang Huan bonded precast prestressed concrete open-cell beam frame structure system of a UHPC connection as defined in claim 1, wherein the open-cell position in the beam is located as far as possible in the midspan 1/3 section, and the distance from the edge of the hole near the node to the inner edge of the node is greater than 1.5 times the height of the beam when located in the beam-end 1/3 section.
7. A method of constructing a UHPC-joined post Zhang Huan bonded precast prestressed concrete open-cell beam frame structure system according to any one of claims 1 to 5, comprising the steps of:
The method comprises the steps of 1, manufacturing a precast concrete lower column (2), a precast concrete upper column (1), a precast concrete perforated beam (7) and a precast concrete slab (18), wherein the precast concrete lower column (2) and the precast concrete upper column (1) are reserved to be anchored into a node core area (4) by a longitudinal main reinforcement which extends out of the precast concrete upper column, the requirement of anchoring length is required to be met, the precast concrete perforated beam (7) is reserved to be anchored into the node core area (4) by a common reinforcement (10) which extends out of the precast concrete perforated beam, the slow-bonding prestressed tendons (9) are pre-buried at design positions when the precast concrete perforated beam (7) is manufactured, and enough lengths are reserved at two ends for facilitating later tensioning;
Step 2, after the prefabricated component is cured, hoisting a precast concrete lower column (2) and installing the precast concrete lower column on a foundation, and installing enough stirrups on a longitudinal main rib (6) extending out of the lower column (2);
Hoisting the precast concrete perforated beam (7) to the top surface of the precast concrete lower column (2), enabling the bottom surface of the precast concrete perforated beam (7) to be flush with the top surface of the precast concrete lower column (2), enabling the end part of the precast concrete perforated beam (7) to be put on the precast concrete lower column (2) and fixed by supporting, wherein common steel bars (10) extending out of the precast concrete perforated beams (7) at two sides are reasonably avoided in a node core area according to construction requirements and are directly anchored;
Hoisting the precast concrete upper column (1) to the position right above the precast concrete lower column (2), and fixing the precast concrete upper column (1) at a corresponding position by using a reliable support (12), and binding stirrups arranged in the step 2 with column longitudinal ribs at the moment, wherein the longitudinal ribs extending out of the precast concrete upper column and the precast concrete lower column are reasonably avoided in a node core area and are directly anchored;
Step 5, penetrating a top through-length reinforcing steel bar (11) through a stirrup reserved in a beam overlapping layer area and a node core area (4) and binding, binding a pre-embedded and extended slow-bonding prestressed rib (9) in a precast concrete perforated beam at the node core area according to a design position, sleeving a non-bonding part of a node on the slow-bonding rib, pouring a UHPC node core area (4), and setting a template so that the UHPC cannot enter the beam overlapping layer (8);
Step 6, after the UHPC node core area (4) is cured to have enough strength, hoisting the precast concrete slab, the superimposed sheet, the double T plate or the secondary beam onto the precast concrete perforated beam (7) and fixing the precast concrete slab, the superimposed sheet, the double T plate or the secondary beam;
7, pouring a beam laminated layer (8) and a plate laminated layer (19);
step 8, stretching the slow-bonding prestressed tendons (9);
And 9, repeating the manufacturing process to finish the post-tensioning slow-bonding precast prestressed concrete open-pore beam frame structure system.
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