CN105649203B - Precast prestressed concrete frame bean column node with U-shaped muscle and sleeve - Google Patents
Precast prestressed concrete frame bean column node with U-shaped muscle and sleeve Download PDFInfo
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- CN105649203B CN105649203B CN201610111965.7A CN201610111965A CN105649203B CN 105649203 B CN105649203 B CN 105649203B CN 201610111965 A CN201610111965 A CN 201610111965A CN 105649203 B CN105649203 B CN 105649203B
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- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 18
- 235000010627 Phaseolus vulgaris Nutrition 0.000 title claims 15
- 244000046052 Phaseolus vulgaris Species 0.000 title claims 15
- 210000003205 muscle Anatomy 0.000 title claims 5
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 86
- 239000010959 steel Substances 0.000 claims abstract description 86
- 239000011178 precast concrete Substances 0.000 claims abstract description 35
- 239000004567 concrete Substances 0.000 claims abstract description 16
- 239000002131 composite material Substances 0.000 claims description 10
- 230000002787 reinforcement Effects 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims 11
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims 2
- 238000005266 casting Methods 0.000 abstract description 17
- 210000002435 tendon Anatomy 0.000 abstract description 16
- 238000010276 construction Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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 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
- E04B1/18—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
- E04B1/22—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 with parts being prestressed
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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
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
本发明公开了一种带有U形筋和套筒的预制预应力混凝土框架梁柱节点，主要包括预制混凝土梁、预制混凝土柱、预制梁底预应力筋和普通受力钢筋、梁顶普通受力钢筋、柱内纵向钢筋、U形钢筋、抗震钢筋及其连接套筒。预制梁的两端预留后浇段，预制梁底部配有的预应力筋伸出梁端并锚固于梁端后浇段，与预制梁柱一起通过后浇注的混凝土形成预制混凝土梁柱节点。将梁底部伸出的普通受力钢筋通过套筒与抗震钢筋相互连接，并在节点后浇区域设置U形钢筋，从而加强本梁柱节点的整体性。本发明降低了生产和施工难度，减轻了预制混凝土梁的截面高度或用钢量，保证了梁柱节点的整体性和抗震性能。
The invention discloses a prefabricated prestressed concrete frame beam-column joint with U-shaped tendons and sleeves. Tensile steel bars, longitudinal steel bars in columns, U-shaped steel bars, anti-seismic steel bars and their connecting sleeves. Post-cast sections are reserved at both ends of the precast beam, and the prestressed tendons at the bottom of the precast beam protrude from the beam end and are anchored to the post-cast section at the beam end. Together with the precast beam and column, the post-cast concrete forms a precast concrete beam-column joint. The ordinary stressed steel bars protruding from the bottom of the beam are connected with the seismic steel bars through sleeves, and U-shaped steel bars are arranged in the post-casting area of the joints, so as to strengthen the integrity of the beam-column joints. The invention reduces the difficulty of production and construction, reduces the section height or steel consumption of the prefabricated concrete beam, and ensures the integrity and anti-seismic performance of the beam-column joint.
Description
技术领域technical field
本发明涉及一种带有U形筋和套筒的预制预应力混凝土框架梁柱节点连接构造，属于土木工程预制混凝土结构技术领域。The invention relates to a prefabricated prestressed concrete frame beam-column node connection structure with U-shaped tendons and sleeves, and belongs to the technical field of civil engineering prefabricated concrete structures.
背景技术Background technique
框架结构主要由梁、柱以及梁柱节点构建而成，属于建筑工程中应用最广的一种结构形式。预制预应力混凝土装配整体式框架结构体系符合“建筑工业化、住宅产业化”和绿色建筑的要求。该类结构体系具有施工速度快、环境污染小、质量有保证以及耐久性好等优点，还具有便于采用先张预应力技术、构件截面减小、节点施工较为简便、用钢量较低等突出特点。The frame structure is mainly constructed of beams, columns and beam-column joints, which is the most widely used structural form in construction engineering. The prefabricated prestressed concrete assembly integral frame structure system meets the requirements of "building industrialization, housing industrialization" and green buildings. This type of structural system has the advantages of fast construction speed, low environmental pollution, guaranteed quality, and good durability. features.
预制预应力混凝土装配整体式框架结构的核心技术是预制混凝土梁与预制混凝土柱的节点连接构造形式，其质量直接影响到该类结构的极限承载力和抗震性能等。目前已有的预制框架结构梁柱节点连接技术将梁端设有键槽或U形凹槽，同时配有预应力筋及普通钢筋，有时辅以U型钢筋，相互搭接、锚固于节点核心区内，并在节点区的后浇段采用混凝土现浇将预制混凝土梁、柱形成一个整体。或在梁底采用高强钢筋，并在节点核心区内放置附加钢筋，但存在造价较大、施工操作空间不足、节点延性性能有所欠缺等不足。以上预制框架梁柱节点连接技术多具有适用性不足、施工建造不便等问题，这使得预制预应力混凝土装配整体式框架结构的应用优势并不明显。The core technology of precast prestressed concrete assembly integral frame structure is the joint connection structure form of precast concrete beams and precast concrete columns, and its quality directly affects the ultimate bearing capacity and seismic performance of this type of structure. At present, the existing prefabricated frame structure beam-column joint connection technology is provided with keyway or U-shaped groove at the end of the beam, and is equipped with prestressed tendons and ordinary steel bars, sometimes supplemented with U-shaped steel bars, which are overlapped and anchored in the core area of the joint. In the post-casting section of the node area, the precast concrete beams and columns are formed into a whole by using concrete cast-in-place. Or use high-strength steel bars at the bottom of the beam, and place additional steel bars in the core area of the joints, but there are disadvantages such as high cost, insufficient space for construction operations, and lack of ductility of the joints. Most of the above prefabricated frame beam-column joint connection technologies have problems such as insufficient applicability and inconvenient construction, which makes the application advantages of prefabricated prestressed concrete assembled integral frame structures not obvious.
如何构建受力性能良好、构造措施合理、施工便捷的新型梁柱节点连接构造，一直是预制预应力混凝土装配整体式框架结构的技术难点。How to construct a new beam-column joint connection structure with good mechanical performance, reasonable structural measures, and convenient construction has always been a technical difficulty in the precast prestressed concrete assembly integral frame structure.
发明内容Contents of the invention
技术问题：本发明提供了一种生产制作难度低、施工便捷、连接形式简单、受力明确的带有U形筋和套筒的预制预应力混凝土框架梁柱节点。Technical problem: The present invention provides a prefabricated prestressed concrete frame beam-column joint with U-shaped tendons and sleeves, which has low production difficulty, convenient construction, simple connection form, and clear force.
技术方案：本发明的带有U形筋和套筒的预制预应力混凝土框架梁柱节点，包括梁柱节点后浇段、设置在所述梁柱节点后浇段水平两端的预制混凝土梁、设置在梁柱节点后浇段上下两端的预制混凝土柱，所述预制混凝土梁和梁柱节点后浇段上方设置有叠合梁上部现浇区域，所述梁柱节点后浇段中配有U形钢筋和位于U形钢筋下侧的连接钢筋，所述预制混凝土柱内配有纵向钢筋，所述叠合梁上部现浇区域中配有预制梁顶部普通受力钢筋，预制混凝土梁的底部配有预制梁底部普通受力钢筋和预应力筋，所述预应力筋伸出梁端并伸入梁柱节点后浇段，沿柱方向向上弯起形成弯钩，锚固于梁柱节点区域后浇段内，所述预制梁底部普通受力钢筋通过连接套筒与连接钢筋连接。Technical solution: The prefabricated prestressed concrete frame beam-column joint with U-shaped tendons and sleeves of the present invention includes post-casting sections of beam-column joints, precast concrete beams arranged at both horizontal ends of the post-casting sections of beam-column joints, setting The prefabricated concrete columns at the upper and lower ends of the post-casting section of the beam-column joint, the upper part of the composite beam is set above the post-casting section of the precast concrete beam and the post-casting section of the beam-column joint, and the post-casting section of the beam-column joint is equipped with a U-shaped Steel bars and connecting steel bars located on the lower side of the U-shaped steel bar, the precast concrete column is equipped with longitudinal steel bars, the upper part of the composite beam is equipped with ordinary force-bearing steel bars at the top of the precast beam, and the bottom of the precast concrete beam is equipped with Ordinary stressed steel bars and prestressed tendons at the bottom of prefabricated beams. The prestressed tendons protrude from the beam end and extend into the post-casting section of the beam-column joint, bend upward along the column direction to form a hook, and are anchored in the post-casting section of the beam-column joint area Inside, the ordinary stressed steel bar at the bottom of the prefabricated beam is connected with the connecting steel bar through the connecting sleeve.
进一步的，本发明的梁柱节点中，所述连接套筒两端所连接的预制梁底部普通受力钢筋和连接钢筋的直径不相同，连接套筒的抗拉承载力标准值应大于或等于所连接预制梁底部普通受力钢筋和连接钢筋的受拉承载力标准值的1.1倍，连接套筒的长度为预制梁底部普通受力钢筋和连接钢筋的直径的2～15倍。Further, in the beam-column joint of the present invention, the diameters of the ordinary stressed steel bar at the bottom of the prefabricated beam connected to the two ends of the connecting sleeve and the connecting steel bar are different, and the standard value of the tensile bearing capacity of the connecting sleeve should be greater than or equal to 1.1 times the standard value of the tensile bearing capacity of the ordinary stressed steel bar at the bottom of the connected prefabricated beam and the connecting steel bar, and the length of the connecting sleeve is 2 to 15 times the diameter of the ordinary stressed steel bar at the bottom of the prefabricated beam and the connecting steel bar.
进一步的，本发明的梁柱节点中，梁柱节点后浇段中，U形钢筋的等强换算面积As换算为0.2A′s～0.8A′s，其中A′s为预制梁顶部普通受力钢筋的总截面面积，As换算根据梁柱节点后浇段内配有的U形钢筋的总截面面积As经等强换算得到；Further, in the beam-column joint of the present invention, in the post-casting section of the beam-column joint, the equal-strength converted area A s of the U-shaped steel bar is converted to 0.2A′ s to 0.8A′ s , where A′ s is the common area at the top of the prefabricated beam The total cross-sectional area of the stressed steel bars, A s conversion is obtained by equal-strength conversion based on the total cross-sectional area A s of the U-shaped steel bars equipped in the post-casting section of the beam-column joint;
所述连接钢筋的截面面积Ase为0.1A′s～0.5A′s。The cross-sectional area A se of the connecting steel bar is 0.1A′ s to 0.5A′ s .
进一步的，本发明的梁柱节点中，梁柱节点后浇段的预留长度，即预制混凝土柱边缘与预制混凝土梁端部的水平间距为采用0.5h～2h，其中h为叠合混凝土梁的高度，即预制混凝土梁和叠合梁上部现浇区域的高度之和。Further, in the beam-column joint of the present invention, the reserved length of the post-cast section of the beam-column joint, that is, the horizontal distance between the edge of the precast concrete column and the end of the precast concrete beam is 0.5h to 2h, where h is the composite concrete beam The height is the sum of the height of the precast concrete beam and the upper cast-in-place area of the composite beam.
有益效果：与现有技术相比，本发明具有以下优点：Beneficial effect: compared with the prior art, the present invention has the following advantages:
(1)常规预制混凝土梁内配置普通受力钢筋，梁的跨越能力较差，为了提高跨越能力，预制预应力混凝土梁内配有预应力筋及普通受力钢筋，以满足混凝土梁的裂缝、拉应力等控制要求，造成构件代价较高，在有效的现浇施工空间内，节点区域的连接和施工作业难度很大。而本发明中预制梁两端留有后浇段，仅需额外配置U形钢筋，并将两侧的普通受力钢筋有效连接，达到了与现浇混凝土框架结构同等的承载能力和抗震性能，降低了预制梁的梁截面或用钢量，从而构件的造价、施工难度显著降低，达到了节材高效的目的。(1) Conventional precast concrete beams are equipped with ordinary stressed steel bars, and the spanning capacity of the beams is poor. In order to improve the spanning capacity, prefabricated prestressed concrete beams are equipped with prestressed tendons and ordinary stressed steel bars to meet the cracks of concrete beams, Tensile stress and other control requirements lead to high cost of components. In the effective cast-in-place construction space, the connection and construction work of the node area is very difficult. In the present invention, there are post-cast sections at both ends of the prefabricated beam, and only U-shaped steel bars need to be additionally configured, and the common stressed steel bars on both sides are effectively connected to achieve the same bearing capacity and seismic performance as the cast-in-place concrete frame structure. The beam section or steel consumption of the prefabricated beam is reduced, so that the cost of the component and the difficulty of construction are significantly reduced, and the purpose of material saving and high efficiency is achieved.
(2)传统预制混凝土梁中受力钢筋相互连接时，采用焊接或绑扎连接，均存在一些缺点。绑扎连接易造成连接失效，狭窄空间操作难度大，而焊接连接的设备体积较大，移动不便、接头合格率低，对操作工人的技术要求较高，操作中焊接质量受工人技术水平影响较大。本发明中采用可连接不同直径连接钢筋的套筒。因此，本技术一方面降低了预制混凝土梁柱节点核心区域内受力钢筋连接的复杂性，有利于梁底部受力钢筋之间的可靠连接，另一方面也显著降低了预制混凝土梁构件的制作、生产难度，提高了现场施工的便捷性和高效性。(2) When the stressed steel bars in traditional precast concrete beams are connected with each other, welding or binding are used, which have some disadvantages. Binding connection is easy to cause connection failure, and it is difficult to operate in a narrow space. However, the equipment for welding connection is large in size, inconvenient to move, and the joint qualification rate is low. The technical requirements for operators are relatively high, and the welding quality during operation is greatly affected by the technical level of workers. . The present invention adopts the sleeve that can connect the connecting steel bars of different diameters. Therefore, on the one hand, this technology reduces the complexity of the connection of stressed steel bars in the core area of precast concrete beam-column joints, which is beneficial to the reliable connection between the stressed steel bars at the bottom of the beam, and on the other hand, it also significantly reduces the fabrication of precast concrete beam components , The difficulty of production improves the convenience and efficiency of on-site construction.
(3)通常预制混凝土梁柱节点处的连接较弱，节点抗震性能较差，而本发明在预制梁的两端及节点核心区域位置配置有U形钢筋，与已相互连接的底部普通受力钢筋一同在后浇段内整浇形成梁柱节点，在保证梁柱节点的整体性和抗震性能的前提下，该连接构造较为简单，受力明确。(3) Usually, the connection at the joints of precast concrete beams and columns is relatively weak, and the seismic performance of the joints is relatively poor. However, in the present invention, U-shaped steel bars are arranged at the two ends of the prefabricated beams and the core area of the joints. The steel bars are integrally poured together in the post-casting section to form a beam-column joint. Under the premise of ensuring the integrity and seismic performance of the beam-column joint, the connection structure is relatively simple and the force is clear.
附图说明Description of drawings
图1为本发明的带有U形筋和套筒的预制预应力混凝土框架梁柱节点连接示意图。Fig. 1 is a schematic diagram of the beam-to-column connection of the prefabricated prestressed concrete frame with U-shaped tendons and sleeves according to the present invention.
图2为图1中预制混凝土梁及叠合梁上部现浇区域的剖面图。Fig. 2 is a cross-sectional view of the prefabricated concrete beam and the upper cast-in-place area of the composite beam in Fig. 1 .
其中：1为预制混凝土梁，2为叠合梁的上部现浇区域，3为预制梁底部普通受力钢筋，4为预制混凝土柱，5为连接套筒，6为预制混凝土梁柱节点后浇段，7为预制梁底部预应力筋，8为U形钢筋，9为预制柱内纵向钢筋，10为预制梁顶部普通受力钢筋，11为满足抗震要求的连接钢筋，12为箍筋。Among them: 1 is the prefabricated concrete beam, 2 is the upper cast-in-place area of the composite beam, 3 is the ordinary stressed steel bar at the bottom of the prefabricated beam, 4 is the precast concrete column, 5 is the connecting sleeve, and 6 is post-casting of the precast concrete beam-column joint 7 is the prestressed tendon at the bottom of the prefabricated beam, 8 is the U-shaped reinforcement, 9 is the longitudinal reinforcement in the prefabricated column, 10 is the common stress reinforcement at the top of the prefabricated beam, 11 is the connecting reinforcement that meets the seismic requirements, and 12 is the stirrup.
具体实施方式Detailed ways
下面结合具体的实施例，并参照附图，对本发明做进一步的说明：Below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention will be further described:
图1为本发明的带有U形筋和套筒的预制预应力混凝土框架梁柱节点示意，而图2对应着图1中预制混凝土梁及叠合梁上部现浇区域的剖面图。如图1、图2所示，一种带有U形筋和套筒的预制预应力混凝土框架梁柱节点，主要由预制混凝土梁1、叠合梁上部现浇区域2、预制梁底部普通受力钢筋3、预制混凝土柱4、连接套筒5、预制梁两端的梁柱节点后浇段6、预制梁底部预应力筋7、U形钢筋8、预制柱内纵向钢筋9、预制梁顶部普通受力钢筋10、满足抗震要求的连接钢筋11。所述的预制混凝土梁1的两端预留后浇段6，预制梁1底部配有普通钢筋3和预应力筋7，其中预应力筋7伸出梁端并通过梁端后浇段6后，沿柱方向向上弯起形成弯钩，锚固于梁柱节点区域后浇段6内。Fig. 1 is a schematic diagram of the prefabricated prestressed concrete frame beam-column joint with U-shaped tendons and sleeves of the present invention, and Fig. 2 corresponds to the cross-sectional view of the prefabricated concrete beam and the upper part of the composite beam in Fig. 1 . As shown in Figure 1 and Figure 2, a prefabricated prestressed concrete frame beam-column joint with U-shaped ribs and sleeves is mainly composed of precast concrete beam 1, the upper part of the composite beam 2, and the bottom of the prefabricated beam. Force reinforcement 3, prefabricated concrete column 4, connecting sleeve 5, post-cast section of beam-column joint at both ends of prefabricated beam 6, prestressed reinforcement at the bottom of prefabricated beam 7, U-shaped reinforcement 8, longitudinal reinforcement in prefabricated column 9, common top of prefabricated beam Stressed steel bars 10, connecting steel bars 11 meeting the seismic requirements. The post-cast section 6 is reserved at both ends of the precast concrete beam 1, and the bottom of the precast beam 1 is equipped with ordinary steel bars 3 and prestressed tendons 7, wherein the prestressed tendons 7 protrude from the beam end and pass through the post-cast section 6 at the beam end. , bent upward along the column direction to form a hook, and anchored in the post-casting section 6 of the beam-column node area.
如图1所示，所述的连接套筒5的两端所连接的预制梁底部普通受力钢筋3和连接钢筋11的直径可不相同。所述连接套筒5的抗拉承载力标准值应大于或等于所连接的预制梁底部普通受力钢筋3和连接钢筋11的受拉承载力标准值的1.1倍，连接套筒5的长度为预制梁底部普通受力钢筋3和连接钢筋11的直径的2～15倍。As shown in FIG. 1 , the diameters of the ordinary stressed steel bar 3 and the connecting steel bar 11 at the bottom of the prefabricated beam connected to the two ends of the connecting sleeve 5 may be different. The standard value of the tensile bearing capacity of the connecting sleeve 5 should be greater than or equal to 1.1 times of the standard value of the tensile bearing capacity of the common stressed steel bar 3 and the connecting steel bar 11 at the bottom of the prefabricated beam connected, and the length of the connecting sleeve 5 is 2 to 15 times the diameters of the ordinary stressed steel bar 3 and the connecting steel bar 11 at the bottom of the prefabricated beam.
图1中所述的带有U形筋和套筒的预制预应力混凝土框架梁柱节点，应在节点后浇段6内设置U形钢筋8，所述的U形钢筋8两端向上弯起呈U形状，更好地使预制混凝土梁1、预制混凝土柱4连接成为一个整体。为确保等强设计，所配有的U形钢筋8的材质、强度等级与预制梁底部普通受力钢筋3相同，且所述U形钢筋8及所述的满足抗震要求的连接钢筋11的总截面面积As按等强换算成梁顶普通钢筋的面积之后的面积As换算为0.2A′s～0.8A＇s，其中A′s为预制梁顶部普通受力钢筋10的总截面面积。此处，等强换算是指不同钢号钢筋代换时，按强度相等的原则进行代换，需考虑不同钢筋的强度设计值。U形钢筋8的锚固长度及混凝土保护层厚度应满足国家现行行业标准和国家规范的相关规定要求。所述的满足抗震要求的连接钢筋11的截面面积Ase为0.1A′s～0.5A′s，其根数宜与普通钢筋3相同。The prefabricated prestressed concrete frame beam-column joint with U-shaped bars and sleeves described in Figure 1 should be provided with U-shaped steel bars 8 in the post-casting section 6 of the joint, and the two ends of the U-shaped steel bars 8 are bent upwards. It is U-shaped, which better connects the precast concrete beam 1 and the precast concrete column 4 to form a whole. In order to ensure equal-strength design, the materials and strength grades of the U-shaped steel bars 8 are the same as those of the ordinary stressed steel bars 3 at the bottom of the prefabricated beams, and the total of the U-shaped steel bars 8 and the connecting steel bars 11 that meet the seismic requirements The cross - sectional area A s is converted into the area of ordinary steel bars at the top of the beam according to the equal strength . Here, equal-strength conversion means that when steel bars of different steel grades are replaced, the substitution is carried out according to the principle of equal strength, and the strength design values of different steel bars need to be considered. The anchorage length of the U-shaped steel bars 8 and the thickness of the concrete cover should meet the relevant requirements of the current national industry standards and national specifications. The cross-sectional area A se of the connecting steel bars 11 meeting the seismic requirements is 0.1A' s to 0.5A' s , and the number of them should be the same as that of ordinary steel bars 3 .
需指出，图1中与连接套筒5相连并满足抗震要求的连接钢筋11及U形钢筋8不但应满足普通钢筋的相关性能指标要求，还需要满足抗震方面的三个要求，即：钢筋11及U形钢筋8的实测抗拉强度与实测屈服强度之比不小于1.25，钢筋11及U形钢筋8的实测屈服强度与常见的热轧钢筋强度特征值之比不大于1.30，钢筋11及U形钢筋8的最大力下的总伸长率不小于9％。当预制混凝土梁1的高度较高时，梁的两侧应设置腰筋，且箍筋12宜采用封闭箍筋。预制梁底部普通受力钢筋3和预应力筋7的分布宜分散、对称；其锚固长度及混凝土保护层厚度应满足国家现行行业标准和国家规范的相关规定要求。It should be pointed out that the connecting steel bar 11 and the U-shaped steel bar 8 that are connected to the connecting sleeve 5 in Fig. 1 and meet the seismic requirements should not only meet the relevant performance index requirements of ordinary steel bars, but also need to meet the three requirements in terms of seismic resistance, namely: steel bar 11 The ratio of the measured tensile strength to the measured yield strength of steel bar 11 and U-shaped steel bar 8 is not less than 1.25, the ratio of the measured yield strength of steel bar 11 and U-shaped steel bar 8 to the characteristic value of the common hot-rolled steel bar strength is not greater than 1.30, and the steel bar 11 and U-shaped steel bar 8 The total elongation under the maximum force of the shaped steel bar 8 is not less than 9%. When the height of the precast concrete beam 1 is high, waist bars should be provided on both sides of the beam, and the stirrups 12 should be closed stirrups. The distribution of ordinary stressed steel bars 3 and prestressed bars 7 at the bottom of prefabricated beams should be dispersed and symmetrical; the anchorage length and the thickness of the concrete cover should meet the relevant requirements of the current national industry standards and national specifications.
预制梁1和预制柱4吊装前，先搭设临时支撑、模板等，并根据设计要求调节支撑高度，以确保预制混凝土梁1和预制混凝土柱4的位置准确无误。现场施工时，将预制混凝土梁1两端的后浇带6设置有模板，将梁底部的预应力筋7、预制梁顶部普通受力钢筋10、箍筋12和柱内纵向钢筋9安装完成，如图2所示，并采用混凝土同时浇筑，形成预制混凝土梁柱节点。Before hoisting the precast beam 1 and the precast column 4, first set up temporary supports, formwork, etc., and adjust the height of the support according to the design requirements, so as to ensure that the positions of the precast concrete beam 1 and the precast concrete column 4 are correct. During on-site construction, the post-casting strips 6 at both ends of the precast concrete beam 1 are provided with formwork, and the prestressed tendons 7 at the bottom of the beam, the ordinary stressed steel bars 10 at the top of the precast beam, the stirrup bars 12 and the longitudinal steel bars 9 in the column are installed. As shown in Figure 2, concrete is poured at the same time to form precast concrete beam-column joints.
以上示意性地对本发明及其实施方式进行了描述，该描述没有限制性，附图1--图2中所示只是本发明的实施方式之一。当本发明所公开连接方式应用于更一般的预制框架结构梁柱节点时，可根据实际梁柱连接方式(如顶层边柱、顶层中柱、一般层边柱等)，对节点区域后浇段的U形钢筋、套筒、预应力筋根数及分布形式作适当调整。因此，如果其他技术人员在未脱离本发明创造宗旨的情况下，采用与该技术方案相似的构件连接方式及实施例，均应属于本发明的保护范围。The present invention and its implementation have been described schematically above, and the description is not restrictive. What is shown in the accompanying drawings 1-2 is only one of the implementations of the present invention. When the connection method disclosed in the present invention is applied to more general beam-column joints of prefabricated frame structures, the post-cast section of the joint area can be made according to the actual beam-column connection mode (such as the top layer side column, the top layer middle column, the general layer side column, etc.). Appropriate adjustments should be made to the number and distribution of U-shaped steel bars, sleeves, and prestressed tendons. Therefore, if other technicians adopt component connection methods and embodiments similar to the technical solution without departing from the inventive concept of the present invention, it shall fall within the scope of protection of the present invention.
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