A load-bearing capacity adaptive composite steel member containing an intelligent telescopic strut

Abstract

The application relates to a load-carrying capacity adaptive combined steel component containing an intelligent telescopic support rod, prestressed components being fixedly installed at both ends of the web or flange of the steel component through anchorage devices, the prestressed components being connected with the top of the intelligent telescopic support rod, the bottom of the intelligent telescopic support rod being fixedly connected with the steel component, the length of the intelligent telescopic support rod changing with the change of the ambient temperature and / or smoke concentration, so that the load-carrying capacity of the whole steel component is automatically adjusted. Compared with the prior art, in the intelligent telescopic support rod, the temperature and smoke sensors receive the temperature and smoke concentration signals of the external environment, the control power supply device is opened and closed, and the size of the current is controlled when the control power supply device is opened, so that the temperature of the SMA spiral coil spring group is adjusted, the deformation of the SMA spiral coil spring group is controlled, the displacement of the internal components is changed, the intelligent telescopic support rod is automatically lengthened and shortened, the load-carrying capacity of the combined steel component is not reduced in the fire, and the purpose of the load-carrying capacity adaptation is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of fire resistance of steel structures, and in particular to a load-bearing capacity adaptive composite steel component containing intelligent telescopic struts. Background Art

[0002] The reinforcement system formed by the application of prestressed materials (including but not limited to FRP plates, FRP cables, steel cables, etc.) and struts can significantly improve the load-bearing performance of pure steel columns and pure steel beams.

[0003] However, when prestressed composite steel components are exposed to fire, the steel is greatly affected by temperature, and basic mechanical properties such as steel strength and elastic modulus drop sharply at high temperatures. The reinforcement system formed by prestressed materials and struts cannot undergo corresponding changes under the disaster to compensate for the significant reduction in the performance of the composite steel components caused by the above factors. Therefore, the structure still has the potential risk of damage or even collapse.

[0004] Therefore, how to ensure that the bearing capacity of prestressed composite steel components is not reduced in the event of a fire is an urgent problem that needs to be solved. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a load-bearing capacity adaptive composite steel structure containing intelligent telescopic struts, which can adaptively adjust the structural load-bearing capacity in the event of a fire.

[0006] The objectives of the present invention can be achieved through the following technical solutions: A load-bearing capacity adaptive composite steel structure containing an intelligent telescopic strut, comprising a steel structure, a prestressed component, an anchor and an intelligent telescopic strut, wherein the steel structure is specifically a steel column or a steel beam, and the prestressed component is fixedly installed on both ends of the web or flange of the steel structure through an anchor, and the prestressed component includes but is not limited to an FRP plate, an FRP cable or a steel cable, the prestressed component is interlaced with the top of the intelligent telescopic strut, and the bottom of the intelligent telescopic strut is fixedly connected to the steel structure, and the length of the intelligent telescopic strut changes accordingly with changes in ambient temperature and / or smoke concentration, thereby automatically adjusting the load-bearing capacity of the entire steel structure.

[0007] Furthermore, the anchor includes a pressure plate and bolts, and holes for installing the bolts are opened at both ends of the steel component.

[0008] Furthermore, the intelligent telescopic support rod includes an outer component of a round steel tube structure, an inner component of a pull rod structure is installed in the outer component, and a first cover plate and a second cover plate are respectively provided at both ends of the outer component, the first cover plate is fixedly connected to the first steel strip, the prestressed component is inserted into the first steel strip, the second cover plate is fixedly connected to the second steel strip, and the second steel strip is fixedly installed on the steel member;

[0009] One end of the inner member is connected to the first cover plate, and the other end of the inner member is connected to the second cover plate via a limit plate. The displacement of one end of the inner member is limited within the outer member, and the displacement of the other end of the inner member is limited within the limit plate.

[0010] A temperature-responsive SMA helical coil spring assembly is provided between the two ends of the inner component, and the two ends of the SMA helical coil spring assembly are fixedly mounted on the first cover plate and the second cover plate respectively;

[0011] The inner part is equipped with a temperature and smoke sensor, a controller and a power supply device which are electrically connected in sequence. The power supply device is connected to a conductive coil via a wire. The conductive coil is arranged at both ends of the SMA helical coil spring group.

[0012] The temperature and smoke sensor detects the external environment temperature and smoke signal and transmits it to the controller, which controls the on and off of the power supply device accordingly. If the power supply device is turned on, the SMA spiral coil spring group is energized, generating heat and heating up. The SMA spiral coil spring group deforms and elongates, causing the internal component to change in displacement and the smart telescopic support rod to extend accordingly; if the power supply device is turned off, the SMA spiral coil spring group recovers to its initial length after losing power, causing the internal component to change in displacement and the smart telescopic support rod to shorten accordingly.

[0013] Furthermore, a plurality of through holes are evenly distributed around the wall surface of the outer component to ensure that the internal temperature and smoke sensors can sensitively detect the external environment temperature and smoke signals.

[0014] Furthermore, the SMA helical coil spring group is evenly arranged along the circumferential direction of the outer component and the inner component, and has a certain pre-compression deformation.

[0015] Furthermore, both ends of the SMA helical coil spring group are fixedly connected to the first cover plate and the second cover plate respectively by welding and adhesive to prevent the SMA helical coil spring group from separating from the first cover plate and the second cover plate when deformed.

[0016] Furthermore, the diameter of one end of the first cover plate is the same as the outer diameter of the outer component, and the diameter of the other end of the first cover plate is the same as the inner diameter of the outer component;

[0017] The diameter of one end of the second cover plate is the same as the outer diameter of the outer member, and the diameter of the other end of the second cover plate is the same as the inner diameter of the limiting plate;

[0018] The outer diameter of the limit plate is the same as the inner diameter of the outer component;

[0019] A boss is provided on the inner wall of one end of the limiting plate connected to the inner component, and the inner diameter of the boss is smaller than the inner diameter of the limiting plate to ensure that the inner component will not separate from the limiting plate when it is displaced.

[0020] Furthermore, a lubricant for reducing friction is applied between the first cover plate and one end of the inner component, and a lubricant for reducing friction is applied between the other end of the inner component and the limiting plate.

[0021] Furthermore, the conductive wire has a telescopic property, so that the conductive wire coil can always be displaced in parallel with the SMA helical coil spring assembly.

[0022] Compared with the existing technology, the present invention installs and connects the prestressed component with the steel structure through the intelligent telescopic strut. The length of the intelligent telescopic strut changes accordingly with the change of ambient temperature and / or smoke concentration to adjust the prestress of the prestressed component and change the cross-section of the structure accordingly, thereby automatically adjusting the bearing capacity of the entire steel structure and solving the problem of decreased mechanical properties of the steel structure in the event of a fire.

[0023] The present invention provides a temperature-responsive SMA helical coil spring group in the intelligent telescopic support rod, and uses temperature and smoke sensors to detect external temperature and smoke concentration signals. The controller then controls the conduction and shutdown of the power supply device accordingly, thereby causing the SMA helical coil spring group to deform and extend when energized or deform and shorten when de-energized. This achieves a change in the displacement of the internal components in the intelligent telescopic support rod, allowing the intelligent telescopic support rod to automatically extend or shorten, thereby controlling the bearing capacity of the combined steel structure to not be reduced in a fire, and effectively achieving a bearing capacity adaptive effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structural decomposition of the load-bearing capacity adaptive composite steel column

[0025] Figure 2 Schematic diagram of the overall structure of the load-bearing capacity adaptive composite steel column

[0026] Figure 3 This is a schematic diagram of the structural decomposition of the load-bearing capacity adaptive composite steel beam;

[0027] Figure 4 This is the overall structural diagram of the load-bearing capacity adaptive composite steel beam;

[0028] Figure 5 Schematic diagram of the external connection structure of the intelligent telescopic support rod;

[0029] Figure 6 This is a schematic diagram of the structure of the intelligent telescopic support rod;

[0030] Figure 7This is a schematic diagram of the overall appearance of the intelligent telescopic support pole;

[0031] Figure 8 Schematic diagram of the assembly of the connection end and the corresponding end of the inner component of the intelligent telescopic support rod;

[0032] Figure 9 Schematic diagram of the assembly of the temperature and smoke sensors, power supply unit, and SMA helical coil spring assembly in the intelligent telescopic support rod;

[0033] Figure 10 Schematic diagram of the limit plate in the intelligent telescopic support rod;

[0034] Figure 11 Schematic cross-section of the intelligent telescopic strut after the SMA helical coil spring assembly is extended;

[0035] Explanation of the marks in the figure: 1. Steel column, 2. Prestressed component, 3. Pressure plate, 4. Bolt, 5. Intelligent telescopic support rod, 6. First steel strip, 7. Second steel strip, 8. Steel beam, 9. External component, 10. Internal component, 11. SMA helical coil spring group, 12. Limit plate, 13. First cover plate, 14. Second cover plate, 15. Temperature and smoke sensor, 16. Conductor coil, 17. Wire, 18. Power supply device. DETAILED DESCRIPTION

[0036] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example

[0038] like Figures 1 to 5 As shown, a load-adaptive composite steel member with intelligent telescopic struts comprises a steel member (steel column 1 or steel beam 8), a prestressed component 2, an anchor (including a pressure plate 3 and bolts 4), and an intelligent telescopic strut 5. The prestressed component 2 includes, but is not limited to, an FRP plate, an FRP cable, or a steel cable. The prestressed component 2 has a certain amount of prestressing force. The ends of the prestressed component 2 are anchored to the web of the steel column 1 or the ends of the flange of the steel beam 8 via a pressure plate 3 and bolts 4 (bolt holes are provided at both ends of the steel column 1 or steel beam 8, which cooperate with the pressure plate 3 with bolt holes). The prestressed component 2 passes through a first steel strip 6 fixed to the top of the intelligent telescopic strut 5. A second steel strip 7 fixed to the bottom of the intelligent telescopic strut 5 is fixedly connected to the middle of the steel column 1 or steel beam 8.

[0039] Under the influence of high temperature or smoke in a fire, the intelligent telescopic support rod 5 will deform and elongate, thereby increasing the cross-section of the component and further increasing the prestress on the prestressed component 2, which can improve the bearing capacity of the steel component to offset the reduction in bearing capacity caused by the attenuation of material properties, thereby achieving the purpose of self-adaptation of bearing capacity under fire and ensuring that the bearing capacity of the steel column 1 or steel beam 8 does not decrease under fire compared to normal temperature.

[0040] like Figures 6 to 9 As shown, the intelligent telescopic support rod 5 includes an SMA helical coil spring group 11 with temperature response, an outer part 9 of a round steel tube structure, an inner part 10 of a pull rod structure, two first cover plates 13 and a second cover plate 14 connected to the outer part 9, a limit plate 12, a wire 17, a wire coil 16, a temperature and smoke sensor 15, a power supply device 18, and a controller.

[0041] The first cover plate 13 and the second cover plate 14 are welded and fixed to two first steel strips 6 and second steel strips 7 of equal width respectively. The second steel strips 7 fixed to the second cover plate 14 are fixed to the flange of the steel beam 8 and the web of the steel column 1 by welding or bolts 4. The middle height of the first steel strips 6 fixed to the first cover plate 13 is lowered for placing the prestressed component 2. The SMA helical coil spring group 11 is under pressure and has a certain pre-deformation.

[0042] like Figure 6 and Figure 7 As shown, the inner component 10 is a steel pull rod with a large end diameter and a small middle diameter. One end of the inner component 10 is a first connecting end, and the corresponding first cover plate 13 is the first corresponding end; the other end of the inner component 10 is a second connecting end, and the corresponding second cover plate 14 is the second corresponding end. The SMA helical coil spring group 11 passes through the first connecting end hole and the second connecting end hole in sequence. The two ends of the SMA helical coil spring group 11 are respectively fixed on the first corresponding end and the second corresponding end. The displacement of the first connecting end is limited in the outer component 9, and the displacement of the second connecting end is limited in the limit plate 12.

[0043] The blocking end of the first cover plate 13 is one end of the outer member 9. The diameter of one end of the first cover plate 13 is the same as the outer diameter of the outer member 9, and the diameter of the other end of the first cover plate 13 is the same as the inner diameter of the outer member 9. One end of the SMA helical coil spring assembly 11 is secured to the first cover plate 13 using multiple methods, such as welding and adhesives. The other end of the SMA helical coil spring assembly 11 is also secured to the second cover plate 14 using multiple methods, such as welding and adhesives, to prevent the SMA helical coil spring assembly 11 from detaching from the first and second cover plates 13, 14 when under tension. The blocking ends of the second cover plate 14 are the stop plate 12 and the outer member 9. The diameter of one end of the second cover plate 14 is the same as the outer diameter of the outer member 9, and the diameter of the other end of the second cover plate 14 is the same as the inner diameter of the stop plate 12. The outer diameter of the stop plate 12 is the same as the inner diameter of the outer member 9. The second cover plate 14, the stop plate 12, and the outer member 9 are fixedly connected by welding. The second connecting end of the inner component 10 moves in the limiting plate 12 , and the second cover plate 14 becomes a blocking end of the second connecting end of the inner component 10 .

[0044] In addition, in order to ensure the balance and stability of the overall structure when subjected to force, the SMA helical coil spring group 11 is evenly arranged along the circumferential direction of the outer member 9 and the inner member 10, and has a certain pre-compression deformation. When the temperature rises to a certain level, the SMA helical coil spring group 11 can stretch. If the temperature continues to rise, the SMA helical coil spring group 11 can further stretch. When the temperature drops to a certain level, the SMA helical coil spring group 11 can return to its original length.

[0045] In order to ensure that the SMA helical coil spring assembly 11 can smoothly move in the axial direction, a lubricant for reducing friction is applied between the first connecting end of the inner member 10 and the first cover plate 13; a lubricant for reducing friction is applied between the second connecting end of the inner member 10 and the limit plate 12;

[0046] In order to better utilize the assembly combination of the cylinder of the outer member 9 and the inner member 10 , the limiting plate 12 is first fixed to the interior of the outer member 9 , and then the second cover plate 14 is restricted within the limiting plate 12 .

[0047] like Figure 8 and Figure 9 As shown, a temperature and smoke sensor 15 and a power supply device 18 are installed in the middle of the inner part 10, and a wire 17 extending from the power supply device 18 is connected to the wire coils 16 at both ends of the spiral coil spring group 11. The temperature and smoke sensor 15 can receive temperature and smoke concentration signals from the external environment, and the controller controls the opening and closing of the power supply device 18 and the magnitude of the current when it is opened.

[0048] The conductive coils 16 are arranged parallel to the length direction and are respectively connected to the upper and lower sides of the SMA helical coil spring assembly 11. When the power supply device 18 is turned on, current can be generated in the SMA helical coil spring assembly 11, so that the temperature value of the SMA helical coil spring assembly 11 is higher than the external temperature.

[0049] Under the influence of the high temperature and smoke density of a fire, temperature and smoke sensor 15 receives external signals. The controller accordingly turns on power supply 18, and current flows through wire 17, conductor coil 16, and SMA helical coil spring assembly 11 to form a closed circuit. This generates heat higher than the external temperature in SMA helical coil spring assembly 11, causing the helical coil spring to extend, causing the second connection end of inner member 10 to move within retaining plate 12, and the first connection end of inner member 10 and first cover plate 13 to move within outer member 9. To better enable temperature and smoke sensor 15 to sensitively receive external temperature and smoke signals, as many holes as possible are evenly distributed around the wall of outer member 9.

[0050] In order to ensure that the SMA helical coil spring assembly 11 is energized and heated by the power supply device 18, the conductive wire 17 and the conductive coil 16 are made of copper wire with good conductivity and have a certain elasticity. When the SMA helical coil spring assembly 11 is extended, the conductive coil 16 can always move parallel to the SMA helical coil spring assembly 11.

[0051] like Figure 10 As shown, a boss is provided at one end of the limiting plate 12 , and the inner diameter of the boss is smaller than the inner diameter of the limiting plate 12 , thereby ensuring that the inner component 10 will not be pulled out of the limiting plate 12 when displacement occurs.

[0052] When a fire occurs, the temperature and smoke sensor 15 receives external signals and responds, and adjusts the temperature of the SMA helical coil spring group 11 through the power supply device 18 to control its deformation, thereby changing the displacement of the internal component 10, so that the intelligent telescopic support rod 5 automatically extends and shortens in the fire, thereby controlling the bearing capacity of the entire composite steel structure so that it will not be reduced in the fire, achieving a self-adaptive bearing capacity effect.

[0053] It can be seen from this that in actual application, when a fire occurs, under the influence of high temperature or smoke in the early and middle stages of the fire, the temperature and smoke sensor 15 receives the temperature and smoke signal, and turns on the switch of the power supply device 18 through the controller to energize and heat the SMA helical coil spring group 11. As the temperature rises, the SMA helical coil spring group 11 is activated to deform and elongate, thereby increasing the displacement of the first connecting end of the inner component 10 and the first cover plate 13, so that the entire composite steel member produces an elongation effect in response to the temperature and smoke, as shown in FIG. Figure 11 As shown, from the outside, the first cover plate 13 and the first connection end of the inner member 10 extend outward. From the inside, the temperature-responsive SMA helical coil spring assembly 11 continues to extend, the first connection end of the inner member 10 slides along the inside of the outer member 9, and the second connection end of the inner member 10 slides along the limit plate 12. Ultimately, the length of the intelligent telescopic strut 5 and the prestress of the prestressed member 2 are adjusted by the continuous extension of the temperature-responsive SMA helical coil spring assembly 11.

[0054] If the fire is controlled in time, as the temperature and smoke concentration decrease, the temperature and smoke sensor 15 receives the temperature and smoke signal, and the controller controls the power supply device 18 to disconnect the switch. The SMA helical coil spring group 11 gradually returns to its original length after power failure.

[0055] In summary, during a fire, the temperature and smoke sensor 15 responds, regulating the temperature of the SMA helical coil spring assembly 11 through the power supply 18, controlling its deformation, thereby changing the displacement of the internal component 10. This allows the intelligent telescopic struts of the composite steel structure to automatically extend and contract in a fire, thereby controlling the load-bearing capacity of the composite steel structure to prevent it from being reduced during a fire, achieving an adaptive load-bearing capacity effect. Furthermore, the components of this technical solution have a simple internal structure and are easy to assemble.

Claims

1. A load-bearing capacity adaptive composite steel member containing intelligent telescopic struts, characterized in that: The invention comprises a steel member, a prestressed component (2), an anchor and an intelligent telescopic support rod (5), wherein the steel member is specifically a steel column (1) or a steel beam (8), the prestressed component (2) is fixedly installed on both ends of the web or flange of the steel member through the anchor, the prestressed component (2) includes but is not limited to an FRP plate, an FRP cable or a steel cable, the prestressed component (2) is interlacedly connected with the top of the intelligent telescopic support rod (5), the bottom of the intelligent telescopic support rod (5) is fixedly connected with the steel member, and the length of the intelligent telescopic support rod (5) changes accordingly with changes in ambient temperature and / or smoke concentration, thereby automatically adjusting the bearing capacity of the entire steel member; The intelligent telescopic support rod (5) includes an outer part (9) of a round steel tube structure, an inner part (10) of a pull rod structure is installed in the outer part (9), and a first cover plate (13) and a second cover plate (14) are respectively provided at both ends of the outer part (9), the first cover plate (13) is fixedly connected to the first steel strip (6), the prestressed part (2) is inserted into the first steel strip (6), the second cover plate (14) is fixedly connected to the second steel strip (7), and the second steel strip (7) is fixedly installed on the steel component; One end of the inner component (10) is correspondingly connected to the first cover plate (13), and the other end of the inner component (10) is correspondingly connected to the second cover plate (14) via the limiting plate (12); the displacement of one end of the inner component (10) is limited within the outer component (9), and the displacement of the other end of the inner component (10) is limited within the limiting plate (12); A temperature-responsive SMA helical coil spring assembly (11) is provided between the two ends of the inner component (10), and the two ends of the SMA helical coil spring assembly (11) are fixedly mounted on the first cover plate (13) and the second cover plate (14), respectively. The inner component (10) is provided with a temperature and smoke sensor (15), a controller and a power supply device (18) which are electrically connected in sequence. The power supply device (18) is connected to a conductive coil (16) via a conductive wire (17). The conductive coil (16) is provided at both ends of the SMA helical coil spring assembly (11). The temperature and smoke sensor (15) detects the external environment temperature and smoke signal and transmits the signal to the controller, which controls the power supply device (18) to be turned on and off accordingly. If the power supply device (18) is turned on, the SMA helical coil spring group (11) is energized, generates heat and is heated, and the SMA helical coil spring group (11) is deformed and elongated, causing the internal component (10) to change its displacement and the intelligent telescopic support rod (5) to be correspondingly elongated. If the power supply device (18) is turned off, the SMA helical coil spring group (11) returns to its initial length after losing power, causing the internal component (10) to change its displacement and the intelligent telescopic support rod (5) to be correspondingly shortened.

2. The load-bearing capacity adaptive composite steel member containing intelligent telescopic struts according to claim 1, characterized in that: The anchor comprises a pressure plate (3) and a bolt (4), and holes for installing the bolt (4) are provided at both ends of the steel component.

3. The load-bearing capacity adaptive composite steel member containing intelligent telescopic struts according to claim 1, characterized in that: The wall surface of the outer component (9) is evenly distributed with a plurality of through holes around it to ensure that the internal temperature and smoke sensor (15) can sensitively detect the external environment temperature and smoke signals.

4. The load-bearing capacity adaptive composite steel member containing intelligent telescopic struts according to claim 1, characterized in that: The SMA helical coil spring group (11) is evenly arranged along the circumferential direction of the outer component (9) and the inner component (10), and has a certain pre-compression deformation.

5. The load-bearing capacity adaptive composite steel member containing intelligent telescopic struts according to claim 1, characterized in that: The two ends of the SMA helical coil spring assembly (11) are fixedly connected to the first cover plate (13) and the second cover plate (14) respectively by welding and adhesive, so as to prevent the SMA helical coil spring assembly (11) from being separated from the first cover plate (13) and the second cover plate (14) when deformed.

6. The load-bearing capacity adaptive composite steel member with intelligent telescopic struts according to claim 1, characterized in that: The diameter of one end of the first cover plate (13) is the same as the outer diameter of the outer component (9), and the diameter of the other end of the first cover plate (13) is the same as the inner diameter of the outer component (9); The diameter of one end of the second cover plate (14) is the same as the outer diameter of the outer component (9), and the diameter of the other end of the second cover plate (14) is the same as the inner diameter of the limiting plate (12); The outer diameter of the limiting plate (12) is the same as the inner diameter of the outer component (9); A boss is provided on the inner wall of one end of the limiting plate (12) connected to the inner component (10), and the inner diameter of the boss is smaller than the inner diameter of the limiting plate (12) to ensure that the inner component (10) does not separate from the limiting plate (12) when displacement occurs.

7. The load-bearing capacity adaptive composite steel member with intelligent telescopic struts according to claim 1, characterized in that: A lubricant for reducing friction is applied between the first cover plate (13) and one end of the inner component (10), and a lubricant for reducing friction is applied between the other end of the inner component (10) and the limiting plate (12).

8. The load-bearing capacity adaptive composite steel member with intelligent telescopic struts according to claim 1, characterized in that: The conductive wire (17) has a telescopic property, so that the conductive coil (16) can always be displaced in parallel with the SMA helical coil spring assembly (11).

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