A node-reinforced assembled concrete frame structure and a method for determining its splicing nodes

Abstract

The present invention proposes a node-reinforced assembled concrete frame structure and a method for determining the splicing nodes thereof, which belongs to the field of architectural design technology. The structure includes a prefabricated node component, a shear key, and a beam component. The prefabricated node component is connected to the beam component through the shear key; the prefabricated node component includes a transverse section spliced ​​with a longitudinal column component and a beam component, and a longitudinal section longitudinally connected to the column component; the column component, the transverse section, and the longitudinal section are prefabricated at the node domain to form an integrated structure. The present invention can improve the overall strength and bearing capacity of the node-reinforced assembled concrete frame structure and ensure the integrity of the complex stress area.

Description

Technical Field

[0001] The present invention belongs to the technical field of building design, and in particular relates to a node-reinforced assembled concrete frame structure and a method for determining a splicing node thereof. Background Art

[0002] At present, the assembled integral frame structure adopts standard column components and beam components, and the node area is cast in situ. The steel bars of the beam and column components are connected in the node area, and the steel bars are connected by mechanical connection or welding. The advantage of the cast-in-situ node area is that the node area has good integrity. The disadvantage is that the steel bar connection parts are all in the parts with complex force and large internal force. Moreover, this is the intersection area of ​​beam and column steel bars, with many steel bars, complex construction, and greater difficulty in concrete pouring. Summary of the invention

[0003] In order to overcome the technical problems existing in the beam-column connection of the existing assembled integral frame structure, the present invention provides a node-reinforced assembled concrete frame structure which can transfer the splicing nodes to the parts with less stress and can be prefabricated into product components and pre-cast and formed, thereby reducing the construction difficulty and improving the overall structural strength.

[0004] At the same time, the present invention also provides a method for determining the splicing nodes of the node-reinforced assembled concrete frame structure, which reduces the construction difficulty and improves the overall structural strength.

[0005] The technical solution adopted by the present invention is:

[0006] A node-reinforced assembled concrete frame structure comprises a prefabricated node component, a shear key, and a beam component, wherein the prefabricated node component is connected to the beam component via the shear key; the prefabricated node component comprises a longitudinal column component, a transverse section spliced ​​with the beam component, and a longitudinal section longitudinally connected to the column component; the column component, the transverse section, and the longitudinal section are prefabricated at the node domain to form an integrated structure; the prefabricated node component in this solution can be cast in advance in the factory and directly formed and installed during installation, thereby saving construction costs and reducing construction difficulty.

[0007] When the transverse section is spliced ​​with the beam member, the position of the splicing node can be determined by the following formula:

[0008]

[0009] Wherein, L1 is the length of the transverse section, mm;

[0010] L is the total length of the beam spliced ​​with the prefabricated node member and the beam member, mm;

[0011] η vb It is the ratio of the bending moment between the joint position of the transverse section and the beam member and the center position of the precast node member; the corresponding values ​​are 1.3, 1.2 and 1.1 when the seismic resistance level is level 1, level 2 and level 3;

[0012] When the longitudinal section is spliced ​​with the column member, the position of the splicing node can be determined by the following formula:

[0013]

[0014] Wherein, L2 is the length of the longitudinal section, mm;

[0015] H is the column height of the prefabricated node component and the column component, mm;

[0016] η vc It is the ratio of the bending moment at the joint position of the longitudinal section and the column member to the center position of the precast node member. For frame structures, the corresponding values ​​are 1.4, 1.3 and 1.2 when the seismic resistance level is level 1, level 2 and level 3. For frames of other structural types except frames, the corresponding values ​​are 1.4 and 1.2 for levels 1 and 2, and 1.1 for levels 3 and 4.

[0017] It is further defined that concave shear grooves are left on the cross-section where the beam member and the transverse section are spliced, on the cross-section where the column member and the longitudinal section are spliced, and on the corresponding splicing end faces of the longitudinal section and the transverse section, and a sleeve plate is arranged on the periphery of the splicing node position to form a casting cavity at the splicing node enclosed by the sleeve plate, and concrete slurry is poured into the casting cavity to form a shear key.

[0018] It is further defined that a beam grouting pipe connected to the shear groove is reserved in the splicing end of the beam component, the injection port of the beam grouting pipe is opened at the top of the beam component, and the outlet connected to the shear groove is opened at the lower part of the beam component, and pouring is carried out from bottom to top into the pouring cavity.

[0019] It is further defined that an overflow pipe and a column grouting pipe connected to the shear groove are reserved in the splicing end of the column component, and the overflow pipe and the column grouting pipe are respectively arranged on both sides of the column component, so that the slurry during pouring can enter from the column grouting pipe to fill the shear groove and then overflow from the overflow pipe.

[0020] The present invention also provides a method for determining a splicing node of a node-reinforced assembled concrete frame structure, which comprises the following steps:

[0021] 1) Determine the total length and seismic resistance level of the beam and / or column according to the design requirements of the spliced ​​beam;

[0022] 2) Determine the transverse section length L1 and longitudinal section length L2 of the precast node member connected to the beam member and column member according to the following formula:

[0023] The transverse node 11 is spliced ​​with the beam member 2, and the position of the splicing node is determined by the following formula:

[0024]

[0025] Wherein, L1 is the length of the transverse section, mm;

[0026] L is the total length of the beam spliced ​​with the prefabricated node member and the beam member, mm;

[0027] η vb It is the ratio of the bending moment between the joint position of the transverse section and the beam member and the center position of the precast node member; the corresponding values ​​are 1.3, 1.2 and 1.1 when the seismic resistance level is level 1, level 2 and level 3;

[0028] When the longitudinal section is spliced ​​with the column member, the position of the splicing node is determined by the following formula:

[0029]

[0030] Wherein, L2 is the length of the longitudinal section 12, mm;

[0031] H is the column height of the prefabricated node component and the column component, mm;

[0032] η vc It is the ratio of the bending moment at the joint position of the longitudinal section and the column member to the center position of the precast node member. For frame structures, the corresponding values ​​are 1.4, 1.3 and 1.2 when the seismic resistance level is level 1, level 2 and level 3. For frames of other structural types except frames, the corresponding values ​​are 1.4 and 1.2 for levels 1 and 2, and 1.1 for levels 3 and 4.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1) Under the premise of meeting the basic requirements of the stress strength of the integrally assembled concrete splicing frame, the present invention transfers the weak parts of the splicing nodes to the parts with less stress, simplifies the nodes at the splicing, avoids the complex stress area where the beam-column steel bars meet, and further improves the overall strength and bearing capacity of the node-reinforced assembled concrete frame structure, ensuring the integrity of the complex stress area.

[0035] 2) The present invention transfers the splicing nodes of beams and columns to a position with less stress, that is, avoids the complex area where the horizontal and vertical reinforcements meet, facilitates the splicing and installation of beams and columns, and reduces the difficulty of construction.

[0036] 3) The prefabricated node component 1 of the present invention can be cast in advance according to the design requirements, which saves time and cost, greatly improves the construction efficiency, and simplifies the construction operation, thereby improving the engineering quality and construction speed of the prefabricated structural system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the node-reinforced prefabricated concrete frame structure.

[0038] Figure 2 It is a schematic diagram of the structure at the splicing node with the column member 13.

[0039] Figure 3 for Figure 2 AA section view.

[0040] Figure 4 It is a schematic diagram of the structure at the splicing node spliced ​​with beam component 2.

[0041] Figure 5 for Figure 4 BB cross-sectional view. DETAILED DESCRIPTION

[0042] The technical solution of the present invention is now further described in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the following implementation scenarios.

[0043] See also Figures 1 to 5 The node-reinforced assembled concrete frame structure of the present invention comprises a prefabricated node component 1, a shear key 4, and a beam component 2. Each connecting end of the prefabricated node component 1 is connected to the beam component 2 or an adjacent prefabricated node component 1 through the shear key 4.

[0044] To further explain, the prefabricated node component 1 includes a longitudinal column component 13, a transverse node 11 spliced ​​with the beam component 2, and a longitudinal node 12 longitudinally connected to the column component 13; the column component 13, the transverse node 11 and the longitudinal node 12 are prefabricated into an integral structure at the node domain; when in use, the column component 13 is usually longitudinally connected to the longitudinal node 12 of an adjacent prefabricated node component 1.

[0045] The splicing node of the prefabricated node component 1 and the beam component 2 is determined by the following steps:

[0046] 1) Determine the total length and seismic resistance level of the beam and / or column according to the design requirements of the spliced ​​beam;

[0047] 2) Determine the length L1 of the transverse section 11 of the transverse connection between the precast node component 1 and the beam component 2 and the length L2 of the longitudinal section 12 of the longitudinal connection between the precast node component 1 and the column component 13 of another precast node component 1 according to the following formula, specifically:

[0048] For high-intensity areas, the reinforcement of the frame beam ends is controlled by earthquake action. The bending moment under earthquake action is distributed linearly on the beam. The joint position of the transverse node 11 and the beam member 2 is determined by the following formula:

[0049]

[0050] Wherein, L1 is the length of the transverse section 11, mm;

[0051] L is the total length of the beam spliced ​​by the prefabricated node component 1 and the beam component 2, mm;

[0052] η vb It is the ratio of the moment between the joint position of the transverse node 11 and the beam member 2 and the center position of the prefabricated node member 1; when the seismic grade is level 1, level 2, and level 3, the corresponding values ​​are 1.3, 1.2, and 1.1;

[0053] When the longitudinal section 12 is spliced ​​with the longitudinal column member 13, the splicing node position is determined by the following formula:

[0054]

[0055] Wherein, L2 is the length of the longitudinal section 12, mm;

[0056] H is the column height of the prefabricated node component 1 and the column component 13, mm;

[0057] η vc It is the ratio of the bending moment between the joint position of the longitudinal section 12 and the column member 13 and the center position of the prefabricated node member 1. For frame structures, the corresponding values ​​are 1.4, 1.3 and 1.2 when the seismic resistance level is level 1, level 2 and level 3. For frames of other structural types except frames, the corresponding values ​​are 1.4 and 1.2 for levels 1 and 2, and 1.1 for levels 3 and 4.

[0058] In order to strengthen the splicing structure of the longitudinal section 12 and the column member 13 and the transverse section 11 and the beam member 2 and meet the transmission of the shear force of the beam member, the shear key 4 of this embodiment is arranged at the splicing node between the beam member 2 and the transverse section 11 and the splicing node between the longitudinal section 12 and the column member 13. Specifically, concave shear grooves are left on the section where the beam member 2 and the transverse section 11 are spliced, on the section where the column member 13 and the longitudinal section 12 are spliced, on the splicing end face of the longitudinal section 12, and on the splicing end face of the transverse section 11. Sleeve plates are respectively arranged on the periphery of each splicing node position to form a casting cavity at the splicing node surrounded by the sleeve plate, and concrete slurry is poured into the casting cavity to form the shear key 4. The sleeve plate is welded to the steel bars of the beam member 2 or the column member 13.

[0059] A beam grouting pipe 7 connected to the shear groove is reserved in the splicing end of the beam component 2. The injection port of the beam grouting pipe 7 is opened at the top of the beam component 2, and the outlet connected to the shear groove is opened at the bottom of the beam component 2. Non-shrinkage fine stone concrete of a higher grade than the beam component 2 is poured from bottom to top into the pouring cavity and cured for a certain period of time to form the shear key 4 of the beam node. The number of beam grouting pipes 7 can be adjusted according to the width of the beam component 2, and multiple beam grouting pipes can be set, and the spacing S1 between them satisfies the condition that S1≤100mm and the distance from the edge of the component is not less than 50mm.

[0060] Similarly, a grouting pipe 6 and a column grouting pipe 5 connected to the shear groove are reserved in the splicing end of the column component 13. The grouting pipe 6 and the column grouting pipe 5 are arranged on both sides of the column component 13 respectively, so that the grouting liquid during pouring can enter the shear groove from the column grouting pipe 5 and overflow from the grouting pipe 6 after filling the shear groove. After pouring non-shrinkage fine stone concrete one grade higher than the beam component 2 into the pouring cavity and curing for a certain period of time, the shear key 4 of the column node is formed. Multiple grouting pipes 6 and column grouting pipes 5 can also be set, and the spacing S2 between them satisfies the condition that S2≤200mm and the distance from the edge of the component is not less than 50mm.

[0061] The following is an example of a frame structure with a span of 8.4m, a floor height of 4.2m and a seismic resistance level of level 2.

[0062]

[0063]

[0064] That is, the method of the present invention determines that the splicing node position of the transverse section 11 and the beam member 2 is the position where the length of the transverse section 11 is 700 mm; the splicing node position of the longitudinal section 12 and the column member 13 is the position where the length of the longitudinal section 12 is 484 mm.

[0065] According to the method of the present invention, for a common integral frame structure, the beam splicing position L1 is within the range of 400mm to 800mm, and the column splicing position L2 is within the range of 800mm to 1200mm, which is convenient for on-site installation. The specific splicing nodes that can achieve the optimal structural strength can be determined according to the above method.

[0066] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. The components and structures not described in detail in this embodiment are well-known components and common structures or common means in the industry and are not described one by one here. All concepts that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A node-reinforced assembled concrete frame structure, It is characterized in that The invention comprises a prefabricated node component (1), a shear key (4), and a beam component (2); the prefabricated node component (1) is connected to the beam component (2) via the shear key (4); the prefabricated node component (1) comprises a longitudinal column component (13), a transverse section (11) spliced ​​with the beam component (2), and a longitudinal section (12) longitudinally connected to the column component (13); the column component (13), the transverse section (11), and the longitudinal section (12) are prefabricated at the node region to form an integrated structure; When the transverse section (11) is spliced ​​with the beam member (2), the position of the splicing node is determined by the following formula: Wherein, L1 is the length of the transverse section (11), mm; L is the total length of the beam spliced ​​between the prefabricated node component (1) and the beam component (2), mm; η vb is the ratio of the bending moment between the joint position of the transverse section (11) and the beam member (2) and the center position of the prefabricated node member (1); when the seismic resistance level is level 1, level 2, and level 3, the corresponding values ​​are 1.3, 1.2, and 1.1; When the longitudinal section (12) is spliced ​​with the column member (13), the position of the splicing node is determined by the following formula: Wherein, L2 is the length of the longitudinal section (12), mm; H is the column height of the longitudinal section (12) and the column member (13), mm; η vc is the ratio of the moment at the joint position of the longitudinal section (12) and the column member (13) to the center position of the prefabricated node member (1). For frame structures, the corresponding values ​​are 1.4, 1.3 and 1.2 when the seismic resistance level is level 1, level 2 and level 3. For frames of other structural types other than frames, the corresponding values ​​are 1.4 and 1.2 when the seismic resistance level is level 1 and level 2, and 1.1 when the seismic resistance level is level 3 and level 4. A sleeve plate is arranged at the periphery of each splicing node position, so that a casting cavity is formed at the splicing node surrounded by the sleeve plate, and concrete slurry is poured into the casting cavity to form a shear key (4); the sleeve plate is welded to the steel bars of the beam component (2) or the column component (13).

2. The node-reinforced assembled concrete frame structure according to claim 1, It is characterized in that Inwardly concave shear grooves are left on the cross section where the beam component (2) and the transverse section (11) are spliced, on the cross section where the column component (13) and the longitudinal section (12) are spliced, and on the corresponding splicing end surfaces of the longitudinal section (12) and the transverse section (11).

3. The node-reinforced assembled concrete frame structure according to claim 2, It is characterized in that A beam grouting pipe (7) connected to the shear groove is reserved in the spliced ​​end of the beam component (2); the injection port of the beam grouting pipe (7) is opened at the top of the beam component (2); the outlet connected to the shear groove is opened at the bottom of the beam component (2); and the casting is performed from bottom to top into the casting cavity.

4. The node-reinforced assembled concrete frame structure according to claim 2, It is characterized in that An overflow pipe (6) and a column grouting pipe (5) connected to the shear groove are reserved in the spliced ​​end of the column component (13). The overflow pipe (6) and the column grouting pipe (5) are arranged on both sides of the column component (13) respectively, so that slurry during pouring can enter from the column grouting pipe (5) to fill the shear groove and then overflow from the overflow pipe (6).

5. A method for determining the splicing nodes of a node-reinforced assembled concrete frame structure, It is characterized in that The following steps are involved: 1) Determine the total length and seismic resistance level of the beam and / or column according to the design requirements of the spliced ​​beam; 2) The length L1 of the transverse section (11) connecting the precast node member (1) with the beam member (2) and the length L2 of the longitudinal section (12) longitudinally connected with the column member (13) are determined according to the following formulas: The transverse section (11) is spliced ​​with the beam member (2), and the position of the splicing node is determined by the following formula: Wherein, L1 is the length of the transverse section (11), mm; L is the total length of the beam spliced ​​between the prefabricated node component (1) and the beam component (2), mm; η vb is the ratio of the bending moment between the joint position of the transverse section (11) and the beam member (2) and the center position of the prefabricated node member (1); when the seismic resistance level is level 1, level 2, and level 3, the corresponding values ​​are 1.3, 1.2, and 1.1; When the longitudinal section (12) is spliced ​​with the column member (13), the position of the splicing node is determined by the following formula: Wherein, L2 is the length of the longitudinal section (12), mm; H is the column height of the longitudinal section (12) and the column member (13), mm; η vc is the ratio of the bending moment at the joint position of the longitudinal section (12) and the column member (13) to the center position of the prefabricated node member (1). For frame structures, the corresponding values ​​are 1.4, 1.3 and 1.2 when the seismic resistance level is level 1, level 2 and level 3. For frames of other structural types except frames, the corresponding values ​​are 1.4 and 1.2 for levels 1 and 2, and 1.1 for levels 3 and 4.

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