Method for controlling longitudinal temperature acting force of super-long steel structure factory building

Abstract

A method for controlling longitudinal temperature acting force of a super-long steel structure plant is characterized by comprising the following steps that a, a common rigid lower column support (1) is arranged at a center temperature fixed point of a longitudinal temperature section or a longitudinal temperature section of the plant, and b, a local structure of a viscous damping lower column support comprises a similar rectangular frame type support. C, the rod type viscous damper (5) is a speed-dependent energy dissipater with a viscous material as a damping medium, d, the mechanical model formula of the rod type viscous damper is F = C * v < alpha >, F is damping force, C is a damping coefficient, v is the relative speed of the two ends of the damper, and alpha is a speed index. The control method for the longitudinal temperature acting force of the super-long steel structure factory building has the advantages that the longitudinal system of the super-long steel structure factory building is extremely low in rigidity and extremely low in resistance under the temperature rising and falling scene, the respective characteristics of common rigid support and viscous damping support are absorbed, rigidity and softness are combined, and the service life of the system is prolonged. The anti-seismic property of the plant is ensured; and the adverse effect of the temperature effect on the plant is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of steel structures, and in particular, relates to a method for controlling the longitudinal temperature force of an ultra-long steel structure factory building. Background Art

[0002] The longitudinal system of steel structure workshops usually adopts longitudinal supports to maintain stability, and at the same time use them to resist longitudinal wind loads, longitudinal crane braking forces, longitudinal seismic effects and longitudinal temperature effects. Figure 1 This is a schematic diagram of the vertical elevation layout of a conventional factory building. The lower column support generally adopts ordinary rigid lower column support. There are many cross-sectional forms of ordinary rigid lower column support, including channel steel section, H-shaped steel section and steel pipe section. (The style of the lower column support of the factory building is related to many factors, and there are other styles such as herringbone, figure eight, K-shaped, and door-shaped. Temperature action is a forced deformation. As the longitudinal length of the factory building increases, the longitudinal deformation value of the factory building under the action of temperature will increase, and the deformation of the longitudinal support will also increase. The resulting temperature force of the longitudinal support will also increase significantly. When the longitudinal length of the steel structure factory building is too long, the problem of excessive longitudinal temperature force can usually be solved by setting seams to disconnect, that is, the super-long steel structure factory building is divided into shorter longitudinal temperature sections. However, sometimes due to various reasons, the super-long factory building has no seams along the longitudinal direction or the length of the temperature section after setting the seams still exceeds a certain value, especially after exceeding the maximum value of 250 meters specified in the "Steel Structure Design Standard" GB50017-2017. At this time, the temperature force will become very large, and often becomes the main control of the longitudinal direction of the factory building, which brings great difficulties to the design of longitudinal support and factory building column foundation.

[0003] At present, when it is inconvenient to set seams in steel structure workshops or the length of the temperature section after setting seams is still long, some additional measures need to be taken, such as 1) adjusting the position of ordinary rigid lower column supports to make them closer to the temperature fixed point to reduce the temperature force; 2) changing the cross-sectional size of different lower column supports (that is, appropriately increasing the cross-sectional area of ​​the lower column supports close to the temperature fixed point, and appropriately reducing the cross-sectional area of ​​the lower column supports far from the temperature fixed point); 3) increasing the column foundation size or the number of foundation piles, and adding multiple foundation tension beams along the longitudinal direction.

[0004] Figure 2 The diagram is a schematic diagram of the longitudinal elevation layout of the BRB buckling restrained brace for the lower column of the factory building. There is also a small number of existing practices that use another method, that is, adjusting the form of the lower column support to BRB buckling restrained brace. BRB buckling restrained brace is a relatively new type of steel support, generally composed of three parts: inner core plate, outer casing and middle filling material. Figure 3The diagram is a schematic diagram of the BRB buckling restraint support structure. Since the role of the external sleeve in this support form is to provide lateral constraints for the core plate to prevent the core plate from buckling and instability, it does not participate in bearing the longitudinal force of the support. Then, after adopting this support form, it is equivalent to reducing the cross-sectional size of the lower column support, that is, only the cross-sectional area of ​​the core plate in the BRB buckling restraint support can be considered. Since the temperature effect is a forced deformation, it is only related to the temperature expansion coefficient of the material and the temperature change value. It can be seen that when the same temperature change occurs in the steel structure plant, the temperature deformation △x generated in the longitudinal direction is consistent. Then, according to Hooke's law F=k*△x, the cross-sectional area of ​​the support is reduced, that is, the elastic coefficient k of the support is reduced, and the internal force F of the support under the temperature condition is reduced to a certain extent, which is convenient for the design of the longitudinal system and foundation of the plant. Summary of the invention

[0005] The purpose of the present invention is to solve the problem of excessive longitudinal temperature force of an ultra-long steel structure factory building and to provide a safe and reliable method for controlling the longitudinal temperature force of an ultra-long steel structure factory building.

[0006] To achieve the above purpose, the technical solution of the present invention is: A method for controlling the longitudinal temperature force of an ultra-long steel structure factory building, characterized by comprising the following steps: a. Set up ordinary rigid lower column supports at the central temperature fixed point in the longitudinal direction of the plant or the longitudinal temperature section, and set up viscous damping lower column supports at a certain length on both sides of the ordinary rigid lower column supports; b. The local structure of the viscous damping lower column support includes a similar rectangular frame-type bracket, the rectangular frame-type bracket is provided with a length connecting rod and a width connecting rod, one of which is connected at right angles to a width connecting rod to form a semi-rectangle, and another length connecting rod is connected at right angles to another width connecting rod to form a semi-rectangle, and the two semi-rectangles are not connected but assembled into a similar rectangular frame-type bracket, and an oblique rod is provided at each of the four corners of the similar rectangular frame-type bracket, and a rod-type viscous damper is provided in the middle of the similar rectangular frame-type bracket; c. Rod-type viscous damper is a velocity-dependent energy dissipator that uses viscous material as the damping medium. It uses the damping force generated by the viscous material flowing through the damping hole due to piston movement to dissipate energy. d. The mechanical model formula of the rod-type viscous damper is F=C*v α , where F is the damping force, C is the damping coefficient, v is the relative velocity at both ends of the damper, and α is the velocity exponent.

[0007] The method for controlling the longitudinal temperature force of the super-long steel structure factory building of the present invention can also be further implemented by adopting the following technical measures.

[0008] In the aforementioned method, the specific location of the viscous damping lower column support should be determined in combination with the total length of the section and the spacing requirements of the seismic code for setting the lower column support.

[0009] The aforementioned method, wherein the corresponding oblique rods are located on a straight line.

[0010] The aforementioned method, wherein the structure of the rod-type viscous damper includes a main cylinder and a sub-cylinder and a guide rod that are adjacently arranged, a damping hole is provided in the main cylinder and is filled with damping material, one end of the guide rod passes through the main cylinder and the sub-cylinder, the guide rod is provided with a piston in the main cylinder, a connecting seat is provided at the other end of the guide rod, and a connecting seat is provided at the other end of the sub-cylinder, thereby achieving a rod-type viscous damper.

[0011] After adopting the above technical solution, the method for controlling the longitudinal temperature force of the super-long steel structure factory building of the present invention has the following advantages: 1. Replace the longitudinal support of the steel structure building away from the temperature fixed point from ordinary rigid lower column support or BRB buckling restraint support to viscous damping support; 2. After the longitudinal supports far away from the temperature fixed point are replaced by viscous damping supports from ordinary rigid supports, the longitudinal system of the ultra-long steel structure factory building can achieve "extremely small stiffness and minimal resistance" in the heating and cooling scenarios, while ensuring its "limited stiffness and limited resistance" characteristics in the earthquake scenario; 3. It absorbs the characteristics of ordinary rigid support and viscous damping support, combining rigidity and flexibility without increasing the difficulty of construction. It not only ensures the seismic performance of the factory building, but also reduces the adverse effects of temperature on the factory building. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the longitudinal elevation layout of a conventional factory building; Figure 2 This is a schematic diagram of the longitudinal elevation layout of the BRB buckling restrained brace of the lower column of the factory building; Figure 3 Schematic diagram of the BRB buckling restrained brace structure; Figure 4 It is a schematic diagram of the longitudinal elevation arrangement of the mixed support of the lower columns of the plant building according to an embodiment of the present invention; Figure 5 It is a partial schematic diagram of the viscous damping lower column support according to an embodiment of the present invention; Figure 6 Schematic diagram of a rod-type viscous damper according to an embodiment of the present invention. DETAILED DESCRIPTION

[0013] The present invention is further described below in conjunction with embodiments and accompanying drawings.

[0014] Example 1 Please refer to Figure 4-6The control method of the longitudinal temperature force of the super-long steel structure factory building of the present invention is to make certain adjustments to the support arrangement of the longitudinal facade of the conventional steel structure factory building, set an ordinary rigid lower column support 1 at the central temperature fixed point of the longitudinal direction of the factory building or the longitudinal temperature section, and set a viscous damping lower column support 2 at a certain length on both sides of the ordinary rigid lower column support 1. The specific setting position of the viscous damping lower column support 2 should be determined in combination with the total length of the section and the spacing requirements for setting the lower column support in the seismic code.

[0015] The local structure of the viscous damping lower column support of the present invention includes a similar rectangular frame bracket, and the viscous damping lower column support 2 includes an oblique rod 3, a connecting rod 4 and a rod-type viscous damper 5. The rod-type viscous damper 5 is a velocity-dependent energy dissipator with viscous material as the damping medium, and uses the damping force generated by the piston movement to make the viscous material flow through the damping hole to dissipate energy. The damping force of the rod-type viscous damper is positively correlated with the relative speed at both ends of the damper. The greater the relative speed, the greater the damping force, and vice versa. The smaller the relative speed, the smaller the damping force. Because the temperature change is a very slow process, the relative speed at both ends of the damper in the corresponding scenario is also extremely slow, while the relative speed at both ends of the damper during earthquake action is much larger, which can greatly reduce the temperature force of the longitudinal system of the plant under temperature action conditions.

[0016] When the temperature of the super-long factory building changes, due to the very slow temperature deformation, the piston movement inside the damper itself causes the viscous material to slowly flow through the damping hole, converting the energy into heat energy, that is, the viscous damping support will follow the relative deformation. Therefore, the viscous damping support will only produce a small temperature force on the factory building foundation (generally less than 10% of the maximum damping force designed for the viscous damper), which has a great effect of releasing the temperature force. Generally speaking, the temperature force can be reduced by more than 90%.

[0017] The present invention has substantial characteristics and significant technical progress. The main feature of the control method of the longitudinal temperature force of the super-long steel structure factory building of the present invention is to replace the longitudinal support of the steel structure factory building far away from the temperature fixed point with the viscous damping support from the ordinary rigid lower column support or the BRB buckling restrained support. It mainly utilizes the characteristic that the damping force of the viscous damper is positively correlated with the relative velocity at both ends. It has only "extremely small stiffness and extremely small resistance" in the working condition of temperature that produces slow deformation, but has the characteristics of "limited stiffness and limited resistance" in the working condition of earthquake that produces faster deformation. After replacing the longitudinal support far away from the temperature fixed point with the viscous damping support from the ordinary rigid support, the "extremely small stiffness and extremely small resistance" of the longitudinal system of the super-long steel structure factory building in the temperature rise and fall scenario can be achieved, while ensuring its "limited stiffness and limited resistance" characteristics in the earthquake action scenario.

[0018] The control method of the longitudinal temperature force of the super-long steel structure factory building of the present invention comprehensively considers structural safety and economic factors, absorbs the respective characteristics of ordinary rigid supports and viscous damping supports, combines rigidity and flexibility, and does not increase the difficulty of construction. It not only ensures the seismic performance of the factory building, but also reduces the adverse effects of temperature on the factory building, reflecting the innovative application of the steel structure factory building support system. In the technical solution design of the control method of the longitudinal temperature force of the super-long steel structure factory building of the present invention, the longitudinal wind load and the longitudinal crane braking force are completely resisted by the ordinary rigid lower column support 1, and the viscous damping lower column support 2 can also reduce the dynamic response under the longitudinal wind load to a certain extent. When a longitudinal earthquake occurs, the viscous damping lower column supports 2 on both sides will provide additional damping, dissipate seismic energy, reduce seismic response, and share the seismic force with the ordinary rigid lower column support 1. When the temperature of the super-long plant changes, due to the very slow temperature deformation, the piston movement inside the damper itself causes the viscous material to slowly flow through the damping hole, converting the energy into heat energy, that is, the viscous damping support will follow the relative deformation, so the viscous damping support will only produce a small temperature force on the plant foundation (generally less than 10% of the maximum damping force of the viscous damper design), which has a great effect of releasing the temperature force. Generally speaking, the temperature force can be reduced by more than 90%. This greatly reduces the design difficulty of the plant's longitudinal system and the corresponding foundation, and solves the problem of excessive longitudinal temperature force in super-long steel structure plants.

[0019] The above embodiments are only for the purpose of illustrating the present invention, but not for limiting the present invention. A person skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A method for controlling the longitudinal temperature force of an ultra-long steel structure factory building, characterized in that The following steps are involved: a. An ordinary rigid lower column support (1) is provided at the central temperature fixed point in the longitudinal direction of the plant or in the longitudinal temperature section, and a viscous damping lower column support (2) is provided at a certain length on both sides of the ordinary rigid lower column support; b. The local structure of the viscous damping lower column support includes a similar rectangular frame-type bracket, the rectangular frame-type bracket is provided with a length connecting rod and a width connecting rod (4), one of the length connecting rods and one of the width connecting rods (4) are connected at right angles to form a semi-rectangle, another length connecting rod and another width connecting rod (4) are connected at right angles to form a semi-rectangle, the two semi-rectangles are not connected but assembled to form a similar rectangular frame-type bracket, each of the four corners of the similar rectangular frame-type bracket is provided with an oblique rod (3), and a rod-type viscous damper (5) is provided in the middle of the similar rectangular frame-type bracket; c. Rod-type viscous damper (5) is a velocity-dependent energy dissipator using viscous material as the damping medium, which dissipates energy by using the damping force generated by the viscous material flowing through the damping hole due to piston movement; d. The mechanical model formula of the rod-type viscous damper is F=C*v α , where F is the damping force, C is the damping coefficient, v is the relative velocity at both ends of the damper, and α is the velocity exponent.

2. The method for controlling the longitudinal temperature force of an ultra-long steel structure factory building according to claim 1, characterized in that: The specific location of the viscous damping lower column support should be determined in combination with the total length of the section and the spacing requirements for setting lower column supports in the seismic code.

3. The method for controlling the longitudinal temperature force of an ultra-long steel structure factory building according to claim 1, characterized in that: The corresponding oblique rods (3) are located on a straight line.

4. The method for controlling the longitudinal temperature force of an ultra-long steel structure factory building according to claim 1, characterized in that: The structure of the rod-type viscous damper (5) comprises a main cylinder and a secondary cylinder arranged adjacent to each other, and a guide rod, wherein a damping hole is provided in the main cylinder and is filled with damping material, one end of the guide rod penetrates the main cylinder and the secondary cylinder, a piston is provided in the main cylinder, a connecting seat is provided at the other end of the guide rod, and a connecting seat is provided at the other end of the secondary cylinder, thereby forming a rod-type viscous damper.

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