A design method of reinforced concrete column with high-strength permanent formwork

Abstract

The application relates to the technical field of architectural design, and discloses a reinforced concrete column design method using a high-strength permanent prefabricated formwork, which comprises the following steps: S1, constructing a prefabricated formwork model and a reinforced concrete column model, and obtaining prefabricated formwork model and reinforced concrete column model design parameters; and S2, analyzing the stress state of the reinforced concrete column under the condition of earthquake response. The application realizes the combination of the assembled prefabricated formwork and the reinforced concrete column, improves the strength and performance of the reinforced concrete column as a whole, facilitates the installation and use of the reinforced concrete column, is suitable for bridge structures or large public buildings with large force components, flexible space forms, small volume, light weight, factory production, easy on-site construction operation and the like, realizes the budget design and quality evaluation of the reinforced concrete column, provides support for the construction and later inspection of the reinforced concrete column, and is convenient for the design and detection of the reinforced concrete column.

Description

Technical Field

[0001] This invention relates to the field of architectural design technology, and in particular to a design method for reinforced concrete columns using high-strength permanent precast formwork. Background Technology

[0002] As an important form of building industrialization, prefabricated concrete structures are most closely related to the core technology of existing systems based on the "equivalent to cast-in-place" design concept. This technology utilizes prefabricated beams, slabs, shear walls, and other components, employing key connection technologies such as sleeve grouting and grout-anchored lap joints to strive for structural integrity and seismic performance close to that of cast-in-place concrete. Currently, this technology has formed mature structural systems such as shear walls and frames, achieving factory production of components and on-site assembly construction. However, existing reinforced concrete column design and fabrication methods struggle to achieve the combined use of prefabricated concrete structures and determine the specific dimensions of reinforced concrete columns. Therefore, a design method for reinforced concrete columns using high-strength permanent prefabricated formwork is proposed. Summary of the Invention

[0003] To address the technical problems existing in the prior art, this invention provides a design method for reinforced concrete columns using high-strength permanent precast formwork.

[0004] This invention is achieved using the following technical solution: a design method for reinforced concrete columns using high-strength permanent precast formwork, comprising the following steps:

[0005] S1. Construct a precast formwork model and a reinforced concrete column model, and obtain the design parameters of the precast formwork model and the reinforced concrete column model;

[0006] S2. Analyze the stress state of the reinforced concrete column under seismic response conditions, and determine the stress equilibrium conditions of the reinforced concrete column based on the stress state.

[0007] S3. Predict and evaluate reinforced concrete columns based on their stress equilibrium conditions.

[0008] S4. Verify the cast reinforced concrete columns based on the predictions and assessments.

[0009] As a further improvement to the above scheme, in step S1, the prefabricated template includes assembly component 1, assembly component 2, and connector 3 disposed between assembly component 1 and assembly component 2.

[0010] As a further improvement to the above scheme, in step S1, the reinforced concrete column includes a steel cage and concrete for wrapping the steel cage.

[0011] As a further improvement to the above scheme, in step S1, the design parameters of the prefabricated template model include the external dimensions of the prefabricated template, the dimensions of the prefabricated template steel plates and angle steel, and the design values ​​of the tensile strength of the prefabricated template steel plates and angle steel. Design values ​​of compressive strength of precast formwork steel plates and angle steel Design value of compressive strength of precast high-performance concrete Tensile area of ​​precast formwork steel plates and angle steel The pressure area of ​​precast formwork steel plates and angle steel The ratio of the stress value to the design value of the axial compressive strength of the concrete in the rectangular stress diagram of the compression zone. The ratio of the stress value to the design value of the axial compressive strength of high-performance concrete in the rectangular stress diagram of the compression zone. The ratio of the height of the compression zone to the height of the neutral axis in a rectangular stress diagram of high-performance concrete. .

[0012] As a further improvement to the above scheme, in step S1, the design parameters of the reinforced concrete column model include the external dimensions of the reinforced concrete column, the longitudinal reinforcement data of the steel cage, the flexural bearing capacity M of the reinforced concrete column section, and the design value of the tensile strength of the steel reinforcement in the reinforced concrete column. Design values ​​of tensile and compressive strength of steel bars in reinforced concrete columns Design value of concrete compressive strength Area of ​​tensile reinforcement in reinforced concrete columns Area of ​​compression reinforcement in reinforced concrete columns Equivalent rectangular stress coefficient of concrete compression zone The axial force N on the cross section of the reinforced concrete column.

[0013] As a further improvement to the above scheme, in step S2, a horizontal seismic shear test is conducted on the reinforced concrete column to determine the stress on the reinforced concrete column. The calculation formula is as follows:

[0014] ,in, This represents the combined bending moment value of a reinforced concrete column caused by horizontal seismic shear force and external forces such as eccentric axial force. The bending moment from the compressive stress on the compression steel plate and angle steel within the high-performance concrete to the tension steel plate. The bending moment from the compressive stress on the high-performance concrete to the tension steel plate. The bending moment from the compression of the reinforcing steel bars in ordinary concrete to the tension plate. The bending moment from the compressive stress on ordinary concrete to the tension steel plate. The bending moment from the tension force on the tensile reinforcement in ordinary concrete to the position of the tension steel plate;

[0015] The distance from the tension reinforcement to the compression edge of the ordinary concrete. The distance from the tension steel plate to the compression edge of the high-performance concrete, Width of the compression zone of ordinary concrete, For high-performance concrete formwork width, The distance from the compression steel plate to the edge of the high-performance concrete, b1 is the distance from the compression reinforcement to the edge of the ordinary concrete, and b1 is the width of the ordinary concrete inside the precast formwork.

[0016] As a further improvement to the above scheme, in step S1, the force equilibrium condition is:

[0017] ,in, , The tensile force on the steel bars The tensile force on steel plates and angle steel, External eccentric axial force on the column section The pressure on the steel bars The pressure on ordinary concrete The pressure on steel plates and angle steel, The pressure exerted on high-performance concrete.

[0018] As a further improvement to the above scheme, in step S3, the reinforced concrete column is predicted based on the force and force balance conditions of the reinforced concrete column.

[0019] As a further improvement to the above scheme, the assembly component 1 includes a U-shaped main body 11. Two sets of vertical steel plates 12 distributed along its length are pre-embedded inside the main body 11. A transverse steel plate 13 distributed along its length is fixed to the side of the two sets of vertical steel plates 12 away from the opening of the main body 11. An L-shaped angle steel 14 for connecting with the assembly component 2 and the connector 3 is installed on the side of the two sets of vertical steel plates 12 away from the transverse steel plate 13.

[0020] As a further improvement to the above scheme, the assembly component 2 includes a main body 21 with a boss-shaped structure. Inside the main body 21, there are two sets of vertical steel plates 22 arranged along its length direction. Between one side of the two sets of vertical steel plates 22, there is a transverse steel plate 23 arranged along its length direction.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. This invention combines prefabricated formwork with reinforced concrete columns, improving the overall strength and performance of the reinforced concrete columns. It also facilitates the installation and use of the reinforced concrete columns and is suitable for bridge structures or large public buildings with large load-bearing components and flexible spatial requirements.

[0023] 2. This invention uses prefabricated modular templates. Compared with traditional prefabricated components, prefabricated standard assembly parts have the characteristics of small size, light weight, factory production capability, and ease of on-site construction operation.

[0024] 3. It enables the budget design and quality assessment of reinforced concrete columns, providing support for the construction and subsequent inspection of reinforced concrete columns, and facilitating the design and testing of reinforced concrete columns. Attached Figure Description

[0025] Figure 1 A flowchart of a design method for reinforced concrete columns using high-strength permanent precast formwork provided by the present invention;

[0026] Figure 2 This is a structural schematic diagram of the steel component of the prefabricated template provided by the present invention;

[0027] Figure 3 This is a structural schematic diagram of the assembly component one provided by the present invention;

[0028] Figure 4 This is a structural schematic diagram of the second assembly component provided by the present invention;

[0029] Figure 5 The stress analysis diagram of the reinforced concrete column in the design method of the reinforced concrete column using high-strength permanent precast formwork provided by the present invention.

[0030] Explanation of key symbols:

[0031] 1. Assembly component one; 2. Assembly component two; 3. Connector; 11. Main body one; 12. Vertical steel plate one; 13. Horizontal steel plate one; 14. Angle steel; 21. Main body two; 22. Vertical steel plate two; 23. Horizontal steel plate two. Detailed Implementation

[0032] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0033] Example 1:

[0034] Please combine Figure 2-4This embodiment of a high-strength permanent precast formwork reinforced concrete column includes a formwork and a reinforced concrete column set inside the formwork. The precast formwork includes an assembly component 1, an assembly component 2, and an insert component 3 set between the assembly component 1 and the assembly component 2.

[0035] Assembly component 1 includes a U-shaped main body 11. Two sets of vertical steel plates 12 distributed along its length are pre-embedded inside the main body 11. A transverse steel plate 13 distributed along its length is fixed to the side of the two sets of vertical steel plates 12 away from the opening of the main body 11. An L-shaped angle steel 14 for connecting with assembly component 2 and connector 3 is installed on the side of the two sets of vertical steel plates 12 away from the transverse steel plate 13.

[0036] The assembly component 2 includes a main body 21 with a boss-shaped structure. Inside the main body 21, there are two sets of vertical steel plates 22 arranged along its length. Between one side of the two sets of vertical steel plates 22, there is a transverse steel plate 23 arranged along its length.

[0037] A reinforced concrete column includes a steel cage and the concrete used to enclose the steel cage.

[0038] Example 2:

[0039] Please combine Figure 1 and 5 A design method for reinforced concrete columns using high-strength permanent precast formwork includes the following steps:

[0040] S1. Construct a precast formwork model and a reinforced concrete column model, and obtain the design parameters of the precast formwork model and the reinforced concrete column model;

[0041] The design parameters for precast formwork models include the external dimensions of the precast formwork, the dimensions of the precast formwork steel plates and angle steel, and the design values ​​of the tensile strength of the precast formwork steel plates and angle steel. Design values ​​of compressive strength of precast formwork steel plates and angle steel Design value of compressive strength of precast high-performance concrete Tensile area of ​​precast formwork steel plates and angle steel The pressure area of ​​precast formwork steel plates and angle steel The ratio of the stress value to the design value of the axial compressive strength of the concrete in the rectangular stress diagram of the compression zone. The ratio of the stress value to the design value of the axial compressive strength of high-performance concrete in the rectangular stress diagram of the compression zone. The ratio of the height of the compression zone to the height of the neutral axis in a rectangular stress diagram of high-performance concrete. ;

[0042] The design parameters for the reinforced concrete column model include the external dimensions of the reinforced concrete column, the longitudinal reinforcement data of the steel cage, the flexural bearing capacity M of the reinforced concrete column section, and the design value of the tensile strength of the steel reinforcement in the reinforced concrete column. Design values ​​of tensile and compressive strength of steel bars in reinforced concrete columns Design value of concrete compressive strength Area of ​​tensile reinforcement in reinforced concrete columns Area of ​​compression reinforcement in reinforced concrete columns Equivalent rectangular stress coefficient of concrete compression zone The axial force N on the normal section of the reinforced concrete column;

[0043] S2. Analyze the stress state of the reinforced concrete column under seismic response conditions, and determine the stress equilibrium conditions of the reinforced concrete column based on the stress state.

[0044] like Figure 5 As shown; a horizontal seismic shear test was conducted on the reinforced concrete column to determine the stress on the reinforced concrete column, and the calculation formula is shown below:

[0045] ,in, This represents the combined bending moment value of a reinforced concrete column caused by horizontal seismic shear force and external forces such as eccentric axial force. The bending moment from the compressive stress on the compression steel plate and angle steel within the high-performance concrete to the tension steel plate. The bending moment from the compressive stress on the high-performance concrete to the tension steel plate. The bending moment from the compression of the reinforcing steel bars in ordinary concrete to the tension plate. The bending moment from the compressive stress on ordinary concrete to the tension steel plate. The bending moment from the tension force on the tensile reinforcement in ordinary concrete to the position of the tension steel plate;

[0046] The distance from the tension reinforcement to the compression edge of the ordinary concrete. The distance from the tension steel plate to the compression edge of the high-performance concrete, Width of the compression zone of ordinary concrete, For high-performance concrete formwork width, The distance from the compression steel plate to the edge of the high-performance concrete, b1 is the distance from the compression reinforcement to the edge of the ordinary concrete, and b1 is the width of the ordinary concrete inside the precast formwork;

[0047] The equilibrium condition is:

[0048] ,in, , The tensile force on the steel bars The tensile force on steel plates and angle steel, External eccentric axial force on the column section The pressure on the steel bars The pressure on ordinary concrete The pressure on steel plates and angle steel, The pressure exerted on high-performance concrete;

[0049] S3. Predict and evaluate reinforced concrete columns based on their stress equilibrium conditions.

[0050] In the design of reinforced concrete columns, the external dimensions of the column and its stress under horizontal seismic shear tests are obtained in advance according to the architectural design requirements. Based on the stress and stress equilibrium conditions of the reinforced concrete column, the cross-sectional area of ​​the internal steel cage reinforcement is calculated. Due to the symmetrical design of the steel cage, the area of ​​the tensile reinforcement in the reinforced concrete column is... Area of ​​compression reinforcement in reinforced concrete columns Consistency refers to the cross-sectional area of ​​the reinforcement cage inside the reinforced concrete column;

[0051] At the same time, based on the above calculation method, the combined bending moment value M of the reinforced concrete column model caused by the horizontal seismic shear force and the external forces such as the eccentric axial force is estimated, so as to determine whether the estimated value is within the design value range and to conduct a budget evaluation of the reinforced concrete column model.

[0052] S4. Verify the cast reinforced concrete columns based on the predictions and assessments.

[0053] The reinforced concrete columns are constructed by pre-assembling precast templates and then pouring reinforced concrete. After the reinforced concrete columns have cured, the stress on the reinforced concrete columns is detected by a horizontal seismic shear test, thereby verifying the design of the reinforced concrete columns.

[0054] This invention combines prefabricated formwork with reinforced concrete columns, improving the overall strength and performance of the reinforced concrete columns while facilitating their installation and use. It is suitable for bridge structures or large public buildings with large load-bearing components and flexible spatial requirements. Compared to traditional prefabricated components, prefabricated standard assembly parts are smaller, lighter, and can be factory-produced, making them easier to install on-site. The invention also enables budget design and quality assessment of reinforced concrete columns, providing support for their construction and subsequent inspection, and facilitating their design and testing.

[0055] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A design method for reinforced concrete columns using high-strength permanent precast formwork, characterized in that, Includes the following steps: S1. Construct a precast formwork model and a reinforced concrete column model, and obtain the design parameters of the precast formwork model and the reinforced concrete column model; S2. Analyze the stress state of the reinforced concrete column under seismic response conditions, and determine the stress equilibrium conditions of the reinforced concrete column based on the stress state. S3. Predict and evaluate reinforced concrete columns based on their stress equilibrium conditions. S4. Verify the cast reinforced concrete columns based on the predictions and assessments.

2. The design method for reinforced concrete columns using high-strength permanent precast formwork as described in claim 1, characterized in that, In step S1, the prefabricated template includes assembly component 1, assembly component 2, and connector 3 disposed between assembly component 1 and assembly component 2.

3. The design method for reinforced concrete columns using high-strength permanent precast formwork as described in claim 1, characterized in that, In step S1, the reinforced concrete column includes a steel cage and concrete for enclosing the steel cage.

4. The design method for reinforced concrete columns using high-strength permanent precast formwork as described in claim 1, characterized in that, In step S1, the design parameters of the prefabricated template model include the external dimensions of the prefabricated template, the dimensions of the prefabricated template steel plates and angle steel, and the design values ​​of the tensile strength of the prefabricated template steel plates and angle steel. Design values ​​of compressive strength of precast formwork steel plates and angle steel Design value of compressive strength of precast high-performance concrete Tensile area of ​​precast formwork steel plates and angle steel The pressure area of ​​precast formwork steel plates and angle steel The ratio of the stress value to the design value of the axial compressive strength of the concrete in the rectangular stress diagram of the compression zone. The ratio of the stress value to the design value of the axial compressive strength of high-performance concrete in the rectangular stress diagram of the compression zone. The ratio of the height of the compression zone to the height of the neutral axis in a rectangular stress diagram of high-performance concrete. .

5. The design method for reinforced concrete columns using high-strength permanent precast formwork as described in claim 1, characterized in that, In step S1, the design parameters of the reinforced concrete column model include the external dimensions of the reinforced concrete column, the longitudinal reinforcement data of the steel cage, the flexural bearing capacity M of the reinforced concrete column section, and the design value of the tensile strength of the steel reinforcement in the reinforced concrete column. Design values ​​of tensile and compressive strength of steel bars in reinforced concrete columns Design value of concrete compressive strength Area of ​​tensile reinforcement in reinforced concrete columns Area of ​​compression reinforcement in reinforced concrete columns Equivalent rectangular stress coefficient of concrete compression zone The axial force N on the cross section of the reinforced concrete column.

6. The design method for reinforced concrete columns using high-strength permanent precast formwork as described in claim 1, characterized in that, In step S2, a horizontal seismic shear test is conducted on the reinforced concrete column to determine the stress on the reinforced concrete column. The calculation formula is as follows: ,in, This represents the combined bending moment value of a reinforced concrete column caused by horizontal seismic shear force and external forces such as eccentric axial force. The bending moment from the compressive stress on the compression steel plate and angle steel within the high-performance concrete to the tension steel plate. The bending moment from the compressive stress on the high-performance concrete to the tension steel plate. The bending moment from the compression of the reinforcing steel bars in ordinary concrete to the tension plate. The bending moment from the compressive stress on ordinary concrete to the tension steel plate. The bending moment from the tension force on the tensile reinforcement in ordinary concrete to the position of the tension steel plate; The distance from the tension reinforcement to the compression edge of the ordinary concrete. The distance from the tension steel plate to the compression edge of the high-performance concrete, Width of the compression zone of ordinary concrete, For high-performance concrete formwork width, The distance from the compression steel plate to the edge of the high-performance concrete, b1 is the distance from the compression reinforcement to the edge of the ordinary concrete, and b1 is the width of the ordinary concrete inside the precast formwork.

7. The design method for reinforced concrete columns using high-strength permanent precast formwork as described in claim 1, characterized in that, In step S2, the force equilibrium condition is: ,in, , The tensile force on the steel bars The tensile force on steel plates and angle steel, External eccentric axial force on the column section The pressure on the steel bars The pressure on ordinary concrete The pressure on steel plates and angle steel, The pressure exerted on high-performance concrete.

8. The design method for reinforced concrete columns using high-strength permanent precast formwork as described in claim 1, characterized in that, In step S3, the reinforced concrete column is predicted based on the forces acting on it and the force balance conditions.

9. The design method for reinforced concrete columns using high-strength permanent precast formwork as described in claim 1, characterized in that, In step S1, the assembly component 1 includes a U-shaped main body 11. Two sets of vertical steel plates 12 distributed along its length are pre-embedded inside the main body 11. A transverse steel plate 13 distributed along its length is fixed to the side of the two sets of vertical steel plates 12 away from the opening of the main body 11. An L-shaped angle steel 14 for connecting with the assembly component 2 and the connector 3 is installed on the side of the two sets of vertical steel plates 12 away from the transverse steel plate 13.

10. The design method for reinforced concrete columns using high-strength permanent precast formwork as described in claim 1, characterized in that, In step S1, the assembly component 2 includes a main body 21 with a boss-shaped structure. Inside the main body 21, there are two sets of vertical steel plates 22 arranged along its length direction. Between one side of the two sets of vertical steel plates 22, there is a transverse steel plate 23 arranged along its length direction.

Images