CN112031504A - Lever type inertia capacity synergistic shape memory alloy self-resetting structure system - Google Patents
Lever type inertia capacity synergistic shape memory alloy self-resetting structure system Download PDFInfo
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- CN112031504A CN112031504A CN202010753226.4A CN202010753226A CN112031504A CN 112031504 A CN112031504 A CN 112031504A CN 202010753226 A CN202010753226 A CN 202010753226A CN 112031504 A CN112031504 A CN 112031504A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
Abstract
The invention provides a lever type inertia capacity synergistic shape memory alloy self-resetting structure system, which comprises two columns and a beam, wherein the two columns are respectively arranged at two ends of the beam to form a door-shaped frame structure; the architecture further comprises: the connecting block is arranged in the middle of the beam; the top end of the lever is movably connected with the connecting block, and the connecting block moves horizontally to drive the lever to swing; the mass block is arranged at the bottom end of the lever; the rotating fulcrum of the lever is arranged on the rigid support; and the self-resetting damper is arranged between the rigid support and the lever. The structure system utilizes the mass amplification effect of the inertia capacity and provides larger inertia for the structure system by using smaller mass, thereby playing the role of flexibly adjusting the natural vibration period of the structure system; and the deformation amplification effect of the lever can obviously improve the energy consumption efficiency of the self-resetting damper and improve the self-resetting acting force of the self-resetting damper on the structure.
Description
Technical Field
The invention belongs to the technical field of structural engineering, and particularly relates to a lever type inertia capacity synergistic shape memory alloy self-resetting structural system.
Background
In order to meet the ductility requirement of a building structure under the action of a strong earthquake and achieve the purpose of falling down under the action of the large earthquake, the current earthquake-resistant design specifications allow main lateral force resistant members to generate plastic deformation under the action of the strong earthquake so as to dissipate earthquake energy, so that the main members in the building structure after the strong earthquake generate serious damage and large residual deformation and are difficult to repair, and even the necessity of repair is lost due to overhigh repair time and capital cost. In order to make building structures quickly put into use after earthquake, the concept of recoverable functional structures has been proposed in recent years. The concept is a structural system which can restore the using function of a building structure without repairing or slightly repairing the building structure after the building structure is subjected to strong earthquake action by applying mechanisms of self-resetting, replacement, swinging, energy consumption and the like. The building structure has low maintenance cost and short period after the earthquake, and is convenient for rescue after the earthquake and rapid recovery of people production and life. Therefore, the development of a novel recoverable functional structure and a corresponding structure seismic design theory has stronger economic and social significance. At present, the realization of a recoverable functional structure becomes a consensus of the earthquake engineering world, various self-resetting structures are proposed, and simultaneously, the rapid development of the earthquake-resistant design theory of the corresponding structure is promoted.
At present, recoverable functional structural systems can be broadly classified into rocking structural systems, self-resetting frame systems, self-resetting support frame structures, composite self-resetting systems, and the like. No matter which structure system is adopted, the self-resetting function of the structure after shock absorption and earthquake is realized by combining the self-resetting device and the energy consumption mechanism, and the key for improving the self-resetting performance of the structure is to use the self-resetting energy consumption device with excellent performance. Currently, the self-resetting shock absorption device mainly adopted is mainly formed by combining prestressed tendons, Shape Memory Alloy (SMA) and butterfly springs and the like with energy dissipation elements (friction, mild steel, viscous dampers and the like) in different forms, and current research shows that the self-resetting shock absorption device can achieve the self-resetting and shock absorption purposes through reasonable design. Compared with other self-resetting materials, the SMA has better deformability and flag-type hysteresis curve characteristics, can simultaneously meet the requirements of ductility, self-resetting and energy consumption of the structure, and is an ideal material for forming the self-resetting energy-consumption damping device. However, compared with materials such as prestressed tendons and the like, the SMA material is higher in cost, and the improvement of the utilization efficiency of the SMA material is a key problem of the SMA self-resetting structure based on the performance structure anti-seismic design.
The SMA damper is a displacement type damper, the efficiency of hysteretic energy consumption of the SMA damper depends on the sensitivity of the damper to the structural displacement response, and the current research shows that increasing the sensitivity of the damper to the structural displacement is an effective means for improving the damping energy consumption efficiency.
But one problem that can not be avoided is that, as a displacement type damper, the SMA damper not only provides hysteretic energy consumption for the building structure, but also increases the lateral stiffness of the building structure and reduces the natural vibration period of the building structure. From the acceleration response spectrum, in most cases, the reduction of the period of natural vibration is detrimental to the acceleration response control of the building structure and even amplifies the seismic effect of the building structure.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a lever-type inertia-capacitance shape memory alloy self-resetting structure system, which aims to solve the problems that the self-vibration period of a building structure is reduced by adopting a displacement damper, the acceleration response control of the building structure is unfavorable, and even the earthquake action of the building structure can be amplified.
In order to achieve the above purpose, the invention provides the following technical scheme:
the lever type inertia capacity synergistic shape memory alloy self-resetting structural system comprises two columns and a beam, wherein the two columns are respectively arranged at two ends of the beam to form a door-shaped frame structure; the architecture further comprises:
the connecting block is arranged in the middle of the beam;
the top end of the lever is movably connected with the connecting block, and the connecting block moves horizontally to drive the lever to swing;
the mass block is arranged at the bottom end of the lever;
the rotating fulcrum of the lever is arranged on the rigid support;
a self-resetting damper mounted between the rigid bracket and the lever.
The lever type inerter-spring synergistic shape memory alloy self-resetting structural system is characterized in that two self-resetting dampers are arranged, and the two self-resetting dampers are arranged on two sides of the mass block respectively;
preferably, the self-resetting damper is a shape memory alloy self-resetting damper.
The lever type inertia capacity synergistic shape memory alloy self-resetting structure system is characterized in that preferably, the rigid support is of a door-shaped structure comprising a cross brace and a vertical brace, a rotating fulcrum of the lever is arranged on the cross brace, one end of the self-resetting damper is connected to the vertical brace, and the other end of the self-resetting damper is connected to the mass block.
The lever type inertia capacity enhancing shape memory alloy self-resetting structure system is characterized in that a long hole is formed in the top end of the lever, a force transmission pin is arranged on the connecting block, and the force transmission pin is arranged in the long hole in a sliding mode so as to drive the lever to rotate when the connecting block moves horizontally.
The lever type inerter-assisted shape memory alloy self-resetting structural system is characterized in that the connecting block is detachably fixed on the beam through a bolt;
a friction plate is arranged between the connecting block and the beam and used for increasing the friction force between the connecting block and the beam;
preferably, the friction plate is an asbestos friction material.
In the lever-type inertia capacity enhancing shape memory alloy self-resetting structural system, preferably, a disc spring set and a backing plate are compressed between the head of the bolt and the connecting block, the backing plate is located between the disc spring set and the connecting block, and the maximum friction force between the connecting block and the friction plate is adjusted by adjusting the compression amount of the disc spring set.
The lever-type inerter-assisted shape memory alloy self-resetting structural system is characterized in that a through hole for the bolt to pass through is formed in the connecting plate, and the diameter of the through hole is larger than that of the bolt;
preferably, the diameter of the through hole is 1.5 times the diameter of the bolt.
The lever type inerter-assisted shape memory alloy self-resetting structural system is characterized in that preferably, a buffer layer is arranged in the through hole;
preferably, the buffer layer is made of rubber.
The lever type inerter-increasing shape memory alloy self-resetting structural system is characterized in that the column and the beam are hinged together through a first hinge, and the column is hinged on a mounting foundation through a second hinge.
The lever-type inertia capacity enhancing shape memory alloy self-resetting structure system is characterized in that a first angle iron is installed at the hinged position of the column and the beam, a second angle iron is installed at the hinged position of the column and the installation foundation, the first angle iron and the second angle iron are used for providing deformation resistance under small earthquake for a door-shaped frame structure formed by the column and the beam, and the first angle iron and the second angle iron can be quickly replaced after being damaged by strong earthquake.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
the lever, the mass block and the rigid support in the structure system form a lever-type inertial volume system, and the lever-type inertial volume system can play a role in amplifying the rotational inertia of the mass block and is convenient for acceleration and displacement control of the structure. Under the action of horizontal seismic inertia force, the beam moves in the horizontal direction, the beam drives the connecting block to move towards one direction, the lever type inertia capacity system provides lateral resistance for resisting the movement of the beam, the connecting block drives the top end of the lever to rotate around the rotating fulcrum, the bottom end of the lever moves towards the opposite direction around the rotating fulcrum, the lever drives the self-resetting damper to deform, and the self-resetting damper extends or shortens; when the earthquake action disappears, the self-resetting damper moves towards the direction of the original state, the self-resetting damper provides restoring force to drag the lever to rotate, the lever drives the connecting block to move towards the opposite direction of the first movement of the connecting block, and the connecting block further drives the beam to restore to the original position. The structure system utilizes the mass amplification effect of the lever-type inertial volume system to provide larger inertia for the structure system by using smaller mass, thereby playing the role of flexibly adjusting the natural vibration period of the structure system; and the displacement amplification effect of the lever is utilized, namely the arm length of the lever connected with the self-resetting damper is larger than that of the lever connected with the connecting block end, the deformation amplification effect of the lever can obviously improve the energy consumption efficiency of the self-resetting damper, the self-resetting acting force of the self-resetting damper on a structural system is improved, and the resetting movement of the beam is facilitated. And compared with a ball screw type inertial container and a gear transmission type inertial container, the lever type inertial container system in the structural system has the advantages of simple structure, lower cost and easiness in implementation.
Thereby compress tightly dish spring group through the bolt and can adjust the decrement of dish spring group, can adjust the packing force between backing plate and connecting block, connecting block and the friction plate, and then can realize the regulation of the biggest frictional force between connecting block and backing plate, connecting block and the friction plate. And through adjusting the biggest frictional force among this structural system, the effect that can adjust the biggest power that the roof beam received avoids the roof beam to damage because of the atress is great.
When the acting force between the connecting block and the friction plate and between the connecting block and the base plate exceeds the maximum sliding friction force, the connecting block can slide relative to the bolt, the relative motion between the connecting block and the bolt is within the diameter limiting range of the through hole, and the buffer layer can play a role in buffering between the connecting block and the bolt, so that the connecting block and the bolt are prevented from colliding and being damaged.
The beam and the column in the structural system are connected through a hinge, and under the action of horizontal seismic inertia force, beam-column joints rotate or rotate at the first hinge and the second hinge to drive the beam to move in the horizontal direction; in the invention, the beam column is hinged, so that the restraint between the beam and the column and between the column and the foundation is released, and the deformation of the structure is mainly concentrated on the angle iron at the hinge. By setting the initial rigidity and the yield displacement of the angle iron, the bending moment and the shearing force in the beam column can be controlled, and the beam column is prevented from generating larger plastic deformation so as to be prevented from being damaged under the action of strong shock. The angle iron and the lever inertia-capacitance self-resetting damper can dissipate earthquake energy together, provide large deformation capacity and self-resetting capacity, and meet the ductility requirement of the structure under the action of an earthquake so as to achieve the purposes of large earthquake and tumbler and function restoration of the structure.
Drawings
FIG. 1 is a diagram illustrating a lever type inertance-inertia memory alloy self-resetting architecture according to an embodiment of the present invention;
FIG. 2 is an enlarged view taken at A in FIG. 1;
FIG. 3 is a mechanical model of a lever-type inerter according to an embodiment of the present invention.
In the figure: 1. a column; 2. a beam; 3. a first angle iron; 4. a buffer layer; 5. a second angle iron; 6. a through hole; 7. a disc spring set; 8. connecting blocks; 9. a force transmission pin; 10. a rigid support; 101. a cross brace; 102 vertical bracing; 11. a self-resetting damper; 12. a lever; 121. a mass block; 13. fixing the pin; 14. a first hinge; 15. a second hinge; 16. a friction plate; 17. a base plate; 18. installing a foundation; 19. and (4) bolts.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
According to the specific embodiment of the invention, as shown in fig. 1-3, the invention provides a lever type inerter-type shape memory alloy self-resetting structural system, which adopts the combination of an inerter and a displacement type damper, and utilizes the frequency modulation of the inerter and the displacement amplification principle of a lever to remarkably increase the deformation response of the shape memory alloy damper during earthquake action and improve the energy consumption efficiency of the shape memory alloy damper.
The lever type inertia capacity shape memory alloy self-resetting structure system comprises two columns 1 and a beam 2, wherein the two columns 1 are respectively arranged at two ends of the beam 2 to form a door-shaped frame structure; the structural system also comprises a connecting block 8, a lever 12, a rigid support 10 and a self-resetting damper 11. The connecting block 8 is arranged in the middle of the beam 2; the top end of the lever 12 is movably connected with the connecting block 8, and the connecting block 8 moves horizontally to drive the lever 12 to swing; the rotation fulcrum of the lever 12 is arranged on the rigid support 10; a self-resetting damper 11 is mounted between the rigid support 10 and the lever 12. The lever 12, the mass block 121 and the rigid support 10 form a lever-type inertial volume system, which can amplify the rotational inertia of the mass block, thereby facilitating the resetting of the beam 2.
When the structural system is used, under the action of horizontal seismic inertia force, a beam 2 moves in the horizontal direction, the beam 2 drives a connecting block 8 to move towards one direction, a lever type inertia capacity system provides lateral resistance for resisting the movement of the beam 2, the connecting block 8 drives the top end of a lever 12 to rotate around a rotating fulcrum, the bottom end of the lever 12 connected with a self-resetting damper 11 moves towards the opposite direction around the rotating fulcrum, the lever 12 drives the self-resetting damper 11 to deform, and the self-resetting damper 11 extends or shortens; when the earthquake action disappears, the self-resetting damper 11 moves towards the direction of the original state, the self-resetting damper 11 provides restoring force to drag the lever 12 to rotate, at the moment, the lever 12 drives the connecting block 8 to move towards the opposite direction of the first movement of the connecting block, and the connecting block 8 further drives the beam 2 to restore to the original position.
The mechanical model of the lever-type inertial container is shown in figure 3, the lever-type inertial container system comprises a rigid support, a lever and a mass block, a hinge rotating fulcrum of the lever is fixed at the top of the rigid support, the uppermost end j of the lever is hinged with a beam, a concentrated mass block m is arranged at the lower end of the lever, and the vertical distance between the rotating fulcrum i and the upper end j of the lever is h1The vertical distance between the rotating fulcrum i and the lower end point of the lever is h1. The mechanical model of the lever-type inerter is shown in the following figure, wherein FDFor horizontal forces of the beam acting on the upper end j of the lever, uijIs the horizontal displacement between the pivot points i and j.
According to differential equation of rigid body fixed axis rotation, there are
Wherein J is the moment of inertia of the lever around the pivot point i, and J-mh2 2；
For levers at FDThe angular velocity of rotation produced under the action of (2) can be known from the geometric relationship
Then
M is2/h1Inertial volume mass m defined as lever type inertial volumeIWhen h is present2＞h1The lever-type inerter has a remarkable mass amplification effect. When the beam moves horizontally, the resistance of the lever-type inertia container is applied, and the resistance and h are equal2/h1Is proportional. The lever-type inertial volume can effectively reduce the acceleration and displacement response of the structure.
Further, two self-resetting dampers 11 are arranged, and the two self-resetting dampers 11 are respectively connected to two sides of the mass block 121; the self-resetting damper 11 is a shape memory alloy self-resetting damper. Shape memory alloy (shape memory alloy, abbreviated as SMA), and the shape memory alloy self-resetting damper is abbreviated as SMA self-resetting damper. When the lever 12 rotates, one of the two self-resetting dampers 11 is extended, and the other is shortened, so that the two self-resetting dampers 11 not only can provide larger restoring force, but also can make the acting force applied to the lever 12 more uniform.
Further, the rigid support 10 is a door-shaped structure comprising a cross brace 101 and a vertical brace 102, a rotation fulcrum of the lever 12 is arranged on the cross brace 101 of the rigid support 10, the lever 12 is mounted on the cross brace 101 of the rigid support 10 through a fixing pin at the rotation fulcrum position, the lever 12 can rotate around the fixing pin, one end of the self-resetting damper 11 is connected to the vertical brace 102, and the other end of the self-resetting damper is connected to the mass block. The door-shaped structure formed by two vertical braces 102 and one wale 101 is more firm.
Furthermore, a long hole is formed in the top end of the lever 12, a force transmission pin 9 is arranged on the connecting block 8, and the force transmission pin 9 is arranged in the long hole in a sliding mode so as to drive the lever 12 to swing when the connecting block 8 moves horizontally. Two walls of the long hole at the top end of the lever 12 are in blocking fit with the force transmission pin 9, so that the connecting block 8 drives the lever 12 to rotate through the force transmission pin 9 when moving, meanwhile, the force transmission pin 9 can slide in the long hole of the lever 12, the structure of the long hole matched with the force transmission pin 9 is simpler, and the lever 12 is driven to swing when the connecting block 8 moves horizontally more flexibly.
The vertical distance between the pivot of the lever 12 and the force transmission pin 9 is h1, and the vertical distance between the pivot of the lever 12 and the self-resetting damper 11 is h 2.
Further, the connecting block 8 is detachably fixed on the beam 2 through a bolt 19; a friction plate 16 is arranged between the connecting block 8 and the beam 2, and the friction plate 16 is used for increasing the friction force between the connecting block 8 and the beam 2, so that the connecting block 8 can drive the beam 2 to restore to the original position. The friction plate 16 is made of an asbestos friction material, which is a composite material formed by using asbestos fibers as a base material and resin as a binder.
Further, a disc spring group 7 and a backing plate 17 are compressed between the head of the bolt 19 and the connecting block 8, the backing plate 17 is located between the disc spring group 7 and the connecting block 8, a through hole 6 for the bolt 19 to pass through is formed in the connecting plate, the diameter of the through hole 6 is larger than that of the bolt 19, and the diameter of the through hole 6 is 1.5 times that of the bolt 19. A buffer layer 4 is arranged in the through hole 6; the cushion layer 4 is made of rubber. The compression amount of the disc spring group 7 can be adjusted by pressing the disc spring group 7 through the bolts 19, the pressing force between the base plate 17 and the connecting block 8 and between the connecting block 8 and the friction plate 16 can be adjusted, and the adjustment of the maximum friction force between the connecting block 8 and the base plate 17 and between the connecting block 8 and the friction plate 16 can be further realized. And in this structural system through adjusting the biggest frictional force, can adjust the biggest effect that roof beam 2 received, the biggest frictional force is the biggest effort that roof beam 2 received to avoid roof beam 2 to damage because of the atress is great. The backing plate 17 is made of asbestos friction material.
Further, the column 1 and the beam 2 are hinged together through a first hinge 14, and the column 1 is hinged on a mounting base 18 through a second hinge 15. The beam 2 and the column 1 in the structural system are connected through hinges, and under the action of horizontal seismic inertia force, the node of the beam 2 and the column 1 rotates or rotates at the first hinge 14 and the second hinge 15 to drive the beam 2 to move in the horizontal direction; that is, the beam 2 and the column 1 are hinged to each other, so that the beam 2 and the column 1 can be conveniently subjected to plastic deformation during the earthquake, the earthquake energy can be dissipated, the ductility requirement of the beam 2 and column 1 structure under the earthquake action can be met, and the purpose of large earthquake collapse can be achieved.
Further, the first angle iron 3 is installed at the hinged position of the column 1 and the beam 2, the second angle iron 5 is installed at the hinged position of the column 1 and the installation foundation 18, and the first angle iron 3 and the second angle iron 5 are used for avoiding the twisting deformation of the door-shaped frame structure formed by the column 1 and the beam 2. The first angle iron 3 is arranged at the hinged position of the beam 2 and the column 1, and the second angle iron 5 is arranged at the hinged position of the column 1 and the installation foundation 18, so that the deformation of the beam 2 and column 1 structure under the non-earthquake condition is avoided, and the stability of the beam 2 and column 1 structure is ensured.
When the lever-type inertia capacity memory alloy self-resetting structure system encounters an earthquake, the joint of the beam 2 and the column 1 generates a rotation or rotation trend at the hinged position under the action of horizontal earthquake inertia force, so that the beam 2 is driven to displace, the structures of the beam 2 and the column 1 generate plastic deformation, and earthquake energy is dissipated. At the moment, a system consisting of the first angle iron 3, the second angle iron 5 and the lever type inertia-self-resetting damper 11 provides lateral resistance for resisting the horizontal earthquake action of the beam 2-column 1 structure. The working principle of the system consisting of the lever type inertia capacity-self-resetting damper 11 is as follows: when the beam 2 moves leftwards, the connecting block 8 moves leftwards together under the driving of the friction plate 16, and the force transmission pin 9 drives the lever 12 to rotate anticlockwise around the fixed pin, so that the self-resetting damper 11 on the left side of the lever 12 is driven to extend, and the self-resetting damper 11 on the right side of the lever 12 is driven to shorten; when the earthquake action disappears, the self-resetting damper 11 provides restoring force to drive the lever 12 to rotate clockwise, the lever 12 pushes the force transmission pin 9 to move rightwards, and the connecting block 8 and the friction plate 16 drive the beam 2 to restore to the original position. When the direction of movement of the beam 2 is reversed, the movement of the structural parts will also be reversed.
In conclusion, the lever-type inertial volume memory alloy self-resetting structure system has the following technical effects:
firstly, the mass amplification effect of the inertial container is utilized, and smaller mass is provided for larger inertia of the structure, so that the effect of flexibly adjusting the natural vibration period of the structure is achieved.
And secondly, the damping energy consumption capability of the self-resetting damper and the self-resetting force provided for the structure are increased by utilizing the displacement amplification effect of the lever.
And thirdly, a damping system acting force self-limiting device is arranged, so that structural damage caused by overlarge acting force of the damping system is prevented.
And compared with the inertia capacitors such as a ball screw and gear transmission, the lever type inertia capacitor has the advantages of simple structure, lower cost and easy realization.
The invention provides a specific scheme of a lever type inerter shape memory alloy self-resetting structure system, which comprises the following steps:
the lever type inertia capacity system is formed by the lever, the mass block and the rigid support in the structural system, can play a role in amplifying the rotational inertia of the mass block, and is convenient for acceleration and displacement control of the structural system. Under the action of horizontal seismic inertia force, the beam 2 moves in the horizontal direction, the beam 2 drives the connecting block 8 to move towards one direction, the lever type inertia capacity system provides lateral resistance for resisting the movement of the beam 2, the connecting block 8 drives the top end of the lever 12 to rotate around a rotating fulcrum, the bottom end of the lever 12 moves towards the opposite direction around the rotating fulcrum, the lever 12 drives the self-resetting damper 11 to deform, and the self-resetting damper 11 extends or shortens; when the earthquake action disappears, the self-resetting damper 11 moves towards the direction of the original state, the self-resetting damper 11 provides restoring force to drag the lever 12 to rotate, at the moment, the lever 12 drives the connecting block 8 to move towards the opposite direction of the first movement of the connecting block, and the connecting block 8 further drives the beam 2 to restore to the original position. The structure system utilizes the mass amplification effect of the lever-type inertial volume system to provide larger inertia for the structure system by using smaller mass, thereby playing the role of flexibly adjusting the natural vibration period of the structure system; and moreover, by utilizing the displacement amplification effect of the lever, namely the arm length of the lever connected with the self-reset damper 11 is larger than that of the lever connected with the end of the connecting block 8, the deformation amplification effect of the lever can obviously improve the energy consumption efficiency of the self-reset damper, improve the self-reset acting force of the self-reset damper on a structural system and facilitate the reset motion of the beam 2. And compared with a ball screw type inertial container and a gear transmission type inertial container, the lever type inertial container system in the structural system has the advantages of simple structure, lower cost and easiness in implementation.
The two self-resetting dampers 11 are symmetrically arranged on two sides of the mass block 121, one of the two self-resetting dampers 11 is extended, the other is shortened, and the two self-resetting dampers 11 not only can provide larger restoring force, but also can make acting force applied to the lever 12 more uniform.
The cross brace 101 of the rigid support 10 is provided with a rotating fulcrum of a lever, the two vertical braces 102 are respectively connected with a self-resetting damper 11, and the two vertical braces 102 and the cross brace 101 form a door-shaped structure, so that the rigid support 10 is firmer.
Two walls of the long hole at the top end of the lever 12 are in blocking fit with the force transmission pin 9, so that the force transmission pin 9 drives the lever 12 to rotate when the connecting block 8 moves, meanwhile, the force transmission pin 9 can slide in the long hole of the lever 12, the structure of the long hole matched with the force transmission pin 9 is simpler, and the lever 12 is driven to swing when the connecting block 8 moves horizontally more flexibly.
The friction plate 16 can increase the friction between the connecting block 8 and the beam 2, so that the connecting block 8 can drive the beam 2 to return to the original position.
The compression amount of the disc spring group 7 can be adjusted by pressing the disc spring group 7 through the bolts 19, the pressing force between the base plate 17 and the connecting block 8 and between the connecting block 8 and the friction plate 16 can be adjusted, and the adjustment of the maximum friction force between the connecting block 8 and the base plate 17 and between the connecting block 8 and the friction plate 16 can be further realized. And in the structure system, the maximum friction force between the connecting block 8 and the friction plate 16 is adjusted, so that the maximum force applied to the beam 2 can be adjusted, and the beam 2 is prevented from being damaged due to large stress.
When the acting force between the connecting block 8 and the friction plate 16 and the backing plate 17 exceeds the maximum sliding friction force, the connecting block 8 slides relative to the bolt 19, the relative movement between the connecting block 8 and the bolt 19 is within the diameter limit range of the through hole 6, and the buffer layer 4 can play a role in buffering between the connecting block 8 and the bolt 19, so that the connecting block 8 and the bolt 19 are prevented from being damaged due to collision.
The beam 2 and the column 1 in the structural system are connected through hinges, and under the action of horizontal seismic inertia force, the nodes of the beam 2 and the column 1 tend to rotate or rotate at the first hinges 14 and the second hinges 15 to drive the beam 2 to move in the horizontal direction; in the invention, the beams 2 and the columns 1 are hinged, so that the restraint between the beams and the columns and between the columns and the foundation is released, and the deformation of the structure is mainly concentrated on the angle iron at the hinge. By setting the initial rigidity and the yield displacement of the angle iron, the bending moment and the shearing force in the beam column can be controlled, and the beam column is prevented from generating larger plastic deformation so as to be prevented from being damaged under the action of strong shock. The angle iron and the lever inertia-capacitance self-resetting damper can dissipate earthquake energy together, provide large deformation capacity and self-resetting capacity, and meet the ductility requirement of the structure under the action of an earthquake so as to achieve the purposes of large earthquake and tumbler and function restoration of the structure.
The invention is not to be considered as limited to the particular embodiments shown, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The lever type inertia capacity synergistic shape memory alloy self-resetting structural system is characterized by comprising two columns and a beam, wherein the two columns are respectively arranged at two ends of the beam to form a door-shaped frame structure; the architecture further comprises:
the connecting block is arranged in the middle of the beam;
the top end of the lever is movably connected with the connecting block, and the connecting block moves horizontally to drive the lever to swing;
the mass block is arranged at the bottom end of the lever;
the rotating fulcrum of the lever is arranged on the rigid support;
a self-resetting damper mounted between the rigid bracket and the lever.
2. The lever type inerter-spring synergistic shape memory alloy self-resetting structural system as claimed in claim 1, wherein two self-resetting dampers are provided, and the two self-resetting dampers are respectively provided on two sides of the mass block;
preferably, the self-resetting damper is a shape memory alloy self-resetting damper.
3. The lever type inerter-spring shape memory alloy self-resetting structural system as claimed in claim 2, wherein the rigid support is a door-shaped structure comprising a cross brace and a vertical brace, the rotation fulcrum of the lever is arranged on the cross brace, one end of the self-resetting damper is connected to the vertical brace, and the other end of the self-resetting damper is connected to the mass block.
4. The lever type inerter-spring shape memory alloy self-resetting structural system as claimed in claim 1, wherein the top end of the lever is provided with a long hole, the connecting block is provided with a force transmission pin, and the force transmission pin is slidably arranged in the long hole so as to drive the lever to rotate when the connecting block moves horizontally.
5. The lever type inerter-assisted shape memory alloy self-resetting structural system as claimed in claim 1, wherein the connecting block is detachably fixed on the beam by a bolt;
a friction plate is arranged between the connecting block and the beam and used for increasing the friction force between the connecting block and the beam;
preferably, the friction plate is an asbestos friction material.
6. The lever type inerter-spring synergistic shape memory alloy self-resetting structural system as claimed in claim 5, wherein a disc spring set and a backing plate are compressed between the head of the bolt and the connecting block, the backing plate is located between the disc spring set and the connecting block, and the maximum friction force between the connecting block and the friction plate is adjusted by adjusting the compression amount of the disc spring set.
7. The lever type inerter-spring synergistic shape memory alloy self-resetting structural system as claimed in claim 5, wherein a through hole for the bolt to pass through is formed in the connecting plate, and the diameter of the through hole is larger than that of the bolt;
preferably, the diameter of the through hole is 1.5 times the diameter of the bolt.
8. The lever type inerter-spring synergistic shape memory alloy self-resetting structural system as claimed in claim 7, wherein a buffer layer is disposed in the through hole;
preferably, the buffer layer is made of rubber.
9. The lever type inerter-synergistic shape memory alloy self-resetting structural system as claimed in any one of claims 1 to 8, wherein the post and the beam are hingedly mounted together by a first hinge, and the post is hingedly mounted to the mounting base by a second hinge.
10. The lever type inerter-spring synergistic shape memory alloy self-resetting structural system as claimed in claim 9, wherein a first angle iron is installed at the hinge joint of the column and the beam, a second angle iron is installed at the hinge joint of the column and the installation foundation, the first angle iron and the second angle iron are used for providing deformation resistance under small earthquake for the door-shaped frame structure formed by the column and the beam, and the first angle iron and the second angle iron can be rapidly replaced after being damaged by strong earthquake.
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| CN113073748A (en) * | 2021-03-16 | 2021-07-06 | 北京工业大学 | Composite energy consumption system with displacement secondary amplification and triggering self-resetting functions |
| CN113236706A (en) * | 2021-05-10 | 2021-08-10 | 南通理工学院 | Be applied to damping device among concrete frame structure |
| CN113864401A (en) * | 2021-10-08 | 2021-12-31 | 南京理工大学 | Ball screw type semi-active inerter device based on lever |
| CN114370109A (en) * | 2022-01-17 | 2022-04-19 | 武汉轻工大学 | Lateral force resisting structure for building |
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