CN115110793A - Auxiliary stabilizing device for historic building and inertial damper determining method thereof - Google Patents
Auxiliary stabilizing device for historic building and inertial damper determining method thereof Download PDFInfo
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- CN115110793A CN115110793A CN202210632360.8A CN202210632360A CN115110793A CN 115110793 A CN115110793 A CN 115110793A CN 202210632360 A CN202210632360 A CN 202210632360A CN 115110793 A CN115110793 A CN 115110793A
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- E—FIXED CONSTRUCTIONS
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- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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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
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- 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
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- 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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- 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
- E04H9/14—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 against other dangerous influences, e.g. tornadoes, floods
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Abstract
The invention relates to the technical field of historic building protection, in particular to an auxiliary stabilizing device for a historic building, which comprises a support fixed at the lower part of a building foundation part and a rigid cross rod fixed at the upper part of a building cross beam, wherein the left end and the right end of the cross rod are hinged with side rods, the bottoms of the side rods are hinged on the support, and the support, the cross rod and the two side rods form a parallelogram mechanism; a damping device is arranged between two opposite hinge points of the parallelogram mechanism, and comprises a motion amplification mechanism and an inertia damper; when the cross rod moves relative to the base, the distance between the two opposite hinge points of the parallelogram structure changes, and the motion amplification mechanism increases the motion amount of the two hinge points and drives the inertial damper to move. The invention aims at the structural characteristics of deformation energy absorption and stress dispersion of wood structure ancient buildings and designs an auxiliary stabilizing device capable of deforming and providing a damping effect. Avoid rigid support structure to destroy the original atress characteristics of timber structure ancient building.
Description
Technical Field
The invention relates to the technical field of historic building protection, in particular to an auxiliary stabilizing device for a historic building and a parameter determination method for an inertial damper of the auxiliary stabilizing device.
Background
The Chinese historic building wood structure can still stand upright after being blown by wind and sun for thousands of years, has static force instability risk caused by deterioration and damage accumulation of daily risk sources, and faces dynamic instability risk caused by sharp increase of damage amount under sudden natural disasters. Under the action of sudden natural disasters (such as earthquakes and strong winds), the connection interface of the ancient building structure can slide and rotate nodes due to the characteristics of a discrete body mechanical model of the ancient building wood structure. On the other hand, the original appearance of the immovable cultural relics should be maintained as much as possible to ensure the originality of the historical information, and the existing reinforcement measures need to invade the cultural relics, so that the principle that the minimal intervention on the cultural relics is difficult to realize and the measures are reversible is difficult to realize.
Meanwhile, the reinforcing measures are not consistent with the energy consumption mechanism of the discrete body model of the historic building, and even dynamic stability performance is reduced, for example, Wenchuan earthquake damage results show that some historical repairs do not play a further protection role on the historic building, and on the contrary, the earthquake resistance of the historic building is also reduced.
Disclosure of Invention
The invention relates to an auxiliary stabilizing device for an ancient building.
The technical problem to be solved is that: the existing building reinforcing structure can destroy the characteristics of a discrete mechanical model of a traditional wooden structure historic building, weaken the energy consumption capability of the historic building to abnormal natural disasters and reduce the stability of the historic building.
In order to solve the technical problem, the auxiliary stabilizing device for the historic building adopts the following scheme.
An auxiliary stabilizing device for an ancient building comprises a support fixed on a building foundation part at the lower part and a rigid cross rod fixed on a building beam at the upper part, wherein side rods are hinged at the left end and the right end of the cross rod, the bottoms of the side rods are hinged on the support, and the support, the cross rod and the two side rods form a parallelogram mechanism;
a damping device is arranged between two opposite hinge points of the parallelogram mechanism, and comprises a motion amplification mechanism and an inertia damper; when the cross rod moves relative to the base, the distance between the two opposite hinge points of the parallelogram structure changes, and the motion amplification mechanism increases the motion amount of the two hinge points and drives the inertial damper to move.
Preferably, two groups of damping devices are symmetrically arranged on the parallelogram structure in the left-right direction, and the two groups of damping devices are respectively connected with two groups of hinge points of the parallelogram mechanism, wherein the two groups of hinge points are opposite to each other in diagonal positions.
Preferably, the damping device further comprises a steel cable, and two ends of the steel cable are respectively arranged at two opposite hinge points of the parallelogram mechanism; the bottom of the steel cable is connected with one end of the support, and the top of the steel cable is connected with the other end of the cross rod;
the cross rod is provided with a sliding groove, the upper end of the steel cable is connected with a sliding block in sliding fit with the sliding groove, the motion amplification mechanism is connected with the upper end of the steel cable, and the motion amplification mechanism is driven by the upper end of the steel cable to move.
Preferably, the motion amplification mechanism comprises a driving end and an output end, the motion distance of the output end is greater than that of the driving end, and the output end of the motion amplification mechanism is connected with the inertial damper;
the motion amplification mechanism is a labor-consuming lever or a scissor mechanism or a gear set or a pulley block.
Preferably, the motion amplification mechanism comprises two labor-consuming levers, namely a first lever and a second lever, the first lever is arranged on the cross rod, and the second lever is arranged on the support; the power arm of the first lever is connected with the top of the steel cable, the resistance arm of the first lever is connected with the power arm of the second lever through a rope and a pulley, and the resistance arm of the second lever is connected with the inertial damper.
Preferably, the motion amplification mechanism is further connected with a reset mechanism, and the reset mechanism can enable the motion amplification mechanism and the inertia damper to return to the original position after the driving force of the motion amplification mechanism is relieved.
Preferably, the cross beam connected with the cross rod is a building door frame, a wood beam at the top of a window frame or a building structure beam, the cross rod is fixedly connected with a plurality of hoops, and the hoops embrace the cross beam tightly; cleaning the contact part of the beam and the hoop to remove the corrosion part, and keeping the contact interface of the beam and the hoop flat and free of local bulges;
preferably, the gap between the cross rod and the cross beam is not less than 1cm, the bending rigidity of the cross rod is not less than 3-5 times of that of the connected wood beam, and the material strength is not less than 7-10 times of that of the connected wood beam.
Preferably, the inertial damper comprises a ball screw, a ball nut, a flywheel and a shell, the shell is mounted on the support, the ball nut is rotatably connected to the support through a bearing, the ball screw is matched with the ball nut, the upper end of the ball screw is connected with the output end of the conveying amplification structure, and the flywheel is fixed on the ball nut;
the motion amplification mechanism drives the ball screw to twitch along the axis of the ball screw, and the screw nut converts the linear motion of the ball screw into rotation and drives the flywheel to move.
Compared with the prior art, the auxiliary stabilizing device for the historic building has the following beneficial effects:
the structure is characterized by discrete stress and deformation energy absorption of the traditional wooden structure ancient building. A variable auxiliary stabilizing device with a damping function is designed in a targeted mode. The reinforcing and supporting device is used for reinforcing, supporting and protecting the traditional wooden structure ancient buildings.
When the building encounters vibration such as earthquake strong wind, the horizontal transverse movement of the cross beam of the historic building with the wood structure can be generated, the wood structure of the building is deformed, and then the resilience is carried out. Thereby absorbing the energy of the building vibration and protecting the building main body. But older buildings, whose wood structure itself has corroded, can no longer provide sufficient deformation and resilience.
In particular, it is mainly composed of a frame of a parallelogram mechanism. The frame of parallelogram mechanism provides the support for the crossbeam of building, consolidates ancient building. When the building is vibrated and deformed, the parallelogram mechanism can be driven to move.
When the parallelogram mechanism moves, the distance between two hinge points which are opposite to each other in a diagonal line changes. The invention arranges a motion amplifying mechanism in the parallelogram mechanism to expand the motion distance of the interval change, then uses the motion amplified by the motion amplifying mechanism to drive an inertia damper, the inertia damper is used for playing a damping role, and consumes the energy of the motion to reduce the deformation and the rebound.
Meanwhile, the invention also provides a method for determining the inertial mass of the inertial damper of the auxiliary stabilizing device for the historic building. The auxiliary stabilizing device for the historic building is matched with the auxiliary stabilizing device for the historic building, which is proposed in the previous paragraph, so that the optimal inertial mass of the inertial damper can be confirmed.
An inertial mass determination method of an inertial damper of an auxiliary stabilizing device of an ancient building aims at determining the optimal inertial mass of the inertial damper of the auxiliary stabilizing device of the ancient building, and comprises the following steps:
step one, measuring the elastic modulus, compressive strength and Poisson ratio of the building beam wood;
step two, measuring the structure size of the building, and determining the sizes of a support, a cross bar and a side bar of the parallelogram structure by combining the installation position of the parallelogram mechanism;
step three, establishing a simulation model according to the data obtained in the step one and the step;
step four, applying horizontal dynamic load to the cross beam of the simulation model in the step three, then continuously changing the inertial mass of the inertial damper, obtaining response values of horizontal deformation of the top of the used wood column under different inertial masses, and obtaining a me-u relation curve of the inertial mass me in the inertial mass damper and the horizontal deformation u of the top of the wood beam;
and fifthly, taking the inertia mass value corresponding to the minimum limit umin on the me-u relation curve as the best inertia mass of the inertia damper.
The parallelogram mechanism of the auxiliary stabilizing device determines the shape, size, rigidity and other information according to the specific structure of the protected ancient building. And therefore cannot be adjusted as desired. The motion amplification mechanism also needs to be set according to the size of the parallelogram mechanism and the possible deformation of the building and the parallelogram mechanism during setting, and the adjustment capability is limited. Therefore, the parameters of the inertia damper are the key to adjusting the damping capacity of the whole auxiliary stabilizing device.
The invention discloses a method for determining inertial mass of an inertial damper of an auxiliary stabilizing device of an ancient building, which is characterized in that the optimal inertial mass of the inertial damper is directly determined by adopting a computer simulation analysis method. When analyzing, the geometrical non-linear influence of the structural system is taken into account. And obtaining a relation curve of the maximum displacement response u and the inertial mass me at the top of the wood beam. The best inertial mass of the inertial damper is directly obtained from the lowest point of the curve.
Drawings
FIG. 1 is a schematic view of the auxiliary stabilizing device for ancient buildings according to the invention after installation;
FIG. 2 is a schematic view of the operation of the device with only one damping device;
FIG. 3 is an embodiment of another motion amplification mechanism of FIG. 2;
FIG. 4 is a perspective view of the structure in which the parallelogram mechanism is mounted;
fig. 5 is a perspective view of the hoop.
Description of reference numerals:
1-parallelogram mechanism, 1 a-support, 1 b-cross bar, 1b 1-chute, 1 c-side bar,
2-a damping device; 2 a-a motion amplification mechanism; 2a 1-first lever, 2a 2-second lever, 2a 3-rope, 2a 4-pulley; 2 b-an inertial damper; 2 c-steel cable, 2 d-slide block;
3-anchor ear
4-reset mechanism
5-a cross beam;
6-building foundation.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, the use of the directional terms such as "upper, lower, left, right" generally means upper, lower, left, right as shown in reference to fig. 1, unless otherwise specified; "inner and outer" refer to the inner and outer relative to the profile of the components themselves. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to solve present building reinforced structure and can destroy the discrete body mechanics model characteristic of traditional timber structure ancient building self, weaken the power consumption ability of ancient building to unusual natural disasters, reduce the problem of the stability of ancient building, this practicality provides a supplementary stabilising arrangement of ancient building. As shown in fig. 1 to 4.
An auxiliary stabilizing device for an ancient building is characterized by comprising a support 1a fixed on a building foundation 6 at the lower part and a rigid cross bar 1b fixed on a building cross beam 5 at the upper part, wherein the left end and the right end of the cross bar 1b are hinged with side bars 1c, the bottoms of the side bars 1c are hinged on the support 1a, and the support 1a, the cross bar 1b and the two side bars 1c form a parallelogram mechanism 1;
a damping device 2 is arranged between two opposite hinge points of the parallelogram mechanism 1, and the damping device 2 comprises a motion amplification mechanism 2a and an inertial damper 2 b; when the cross rod 1b moves relative to the base, the distance between the two opposite hinge points of the parallelogram structure changes, and the motion amplification mechanism 2a increases the motion amount of the two hinge points and drives the inertial damper 2b to move.
The structure is characterized by discrete stress and deformation energy absorption of the traditional wooden structure ancient building. A variable auxiliary stabilizing device with a damping function is designed in a targeted mode. The reinforcing and supporting device is used for reinforcing, supporting and protecting the traditional wooden structure ancient buildings. When the building encounters vibration such as earthquake strong wind, the horizontal transverse movement of the cross beam 5 of the historic building with the wood structure can occur, the deformation of the wood structure of the building can occur, and then the resilience is performed. Thereby absorbing the energy of the building vibration and protecting the building main body. But older buildings, whose wood structure itself has corroded, can no longer provide sufficient deformation and resilience.
In particular, it is mainly composed of the frame of one parallelogram mechanism 1. The frame of the parallelogram mechanism 1 provides support for the cross beam 5 of the building, and reinforces the historic building. When the building is vibrated and deformed, the parallelogram mechanism 1 is driven to move. When the parallelogram mechanism 1 moves, the distance between two hinge points which are opposite to each other in a diagonal line changes. The invention arranges a motion amplifying mechanism 2a in a parallelogram mechanism 1 to enlarge the motion distance of the interval change, then uses the motion amplified by the motion amplifying mechanism 2a to drive an inertia damper 2b, the inertia damper 2b is used for playing a damping role, and consumes the energy of the motion to reduce the deformation and rebound.
The main reason why ancient buildings need to be reinforced and protected is that the wood structures mainly stressed on the original building main bodies are deformed or can not provide enough supporting force any more after years of corrosion. Therefore, the most important thing for reinforcing the ancient building is to provide support, the ancient building auxiliary stabilizing device of the invention is firstly a parallelogram mechanism 1 with a frame structure, a bottom support 1a is arranged at the stable part of the building, generally the bottom of a door frame, the bottom of a window frame or a stable support structure formed by artificially reinforcing the building. Then the cross bar 1b at the top is supported by two side bars 1c, and the cross bar 1b is used for supporting a cross beam 5 structure of a building to disperse pressure for a column of the building. However, if a fixed frame structure is directly welded with metal, the seismic energy dissipation capability of the wood structure building itself is destroyed. When external stress influences such as earthquake strong wind and the like occur, the cross beam 5 of the building can translate, the column body of the building deforms to a certain extent or the beam-column combination part of the building deforms in a torsional mode, and then resilience is carried out to absorb the energy of building vibration. This is also the core of wooden ancient building shock resistance. If the frame is fixed, the cross member 5 is difficult to horizontally traverse, or slippage occurs at the connecting portion of the frame and the cross member 5, and damage to the building is rather increased. The earthquake resistance and wind resistance of the building are weakened.
Therefore, the framework of the invention is a movable parallelogram mechanism 1, when a building deforms, the parallelogram mechanism 1 firstly deforms along with the building, so that the elastic shock resistance of the building is not influenced while the support protection is provided for the building.
Secondly, the resilience of the historic building is greatly weakened due to the aging of the wood structure. Therefore, the damping device 2 is also arranged in the parallelogram mechanism 1 and is used for assisting the building to absorb energy and resist earthquake when the building is stressed and deformed, reducing the stress concentration of the building and avoiding the deformation from exceeding the stress limit of an aged wood structure. At the same time, since the deformation of the building is generally not large, the damping device 2 first includes a motion amplification mechanism 2 a. The distance between the diagonals of the parallelogram mechanism 1 can be changed when the parallelogram mechanism moves, and the motion amplification mechanism 2a amplifies the change distance to drive the inertia damping device 2 to realize the damping effect.
The building foundation 6 in which the support 1a is installed is determined according to the specific structural conditions of the protected wood building, and can be a masonry foundation of a story building, a bottom cross beam 5 at the lower edge of a building window and a door opening as shown in fig. 4, or a support beam on a building floor. The support 1a forms on the one hand a parallelogram mechanism 1 and on the other hand provides a fixing and mounting base for other accessory devices.
As shown in fig. 1, when the parallelogram mechanism 1 moves, the distances between the two diagonal hinge points of the parallelogram mechanism change, and one of the two hinge points is lengthened while the other hinge point is shortened. Therefore, in order to balance stress, two groups of damping devices 2 are symmetrically arranged on the parallelogram structure from left to right, and the two groups of damping devices 2 are respectively connected with two groups of opposite hinge points of the parallelogram structure 1. The two opposite hinge points are the upper left and lower right hinge points and the upper right and lower left hinge points, respectively, in fig. 1.
Since the two damping devices 2 have the same structure and are symmetrically disposed at different positions, only one of them will be described in the following description. That is, as shown in fig. 2 and 3.
As shown in fig. 2, the damping device 2 further comprises a steel cable 2c, two ends of the steel cable 2c are respectively arranged at two opposite hinge points of the parallelogram mechanism 1; the bottom of the steel cable 2c is connected with one end of the support 1a, and the top of the steel cable 2c is connected with the other end of the cross rod 1 b; the cross bar 1b is provided with a sliding groove 1b1, the upper end of the steel cable 2c is connected with a sliding block 2d which is in sliding fit with the sliding groove 1b1, the motion amplification mechanism 2a is connected with the upper end of the steel cable 2c, and the motion amplification mechanism 2a is driven by the upper end of the steel cable 2c to move. The steel cable 2c may be a rigid rod or a flexible steel cable, and is herein referred to collectively as steel cable 2c for the sake of name. The motion amplification mechanism 2a cannot be installed at the diagonal hinge point of each type of parallelogram mechanism 1 due to design standardization. Taking fig. 2 and 3 as an example, a steel cable 2c connects two diagonal hinge points of the parallelogram mechanism 1, and the bottom of the steel cable 2c is fixed at the right end of the support 1 a; the top of the cable 2c is slidably mounted to the left end of the cross bar 1b through a slider 2d, and when the parallelogram mechanism 1 moves, the slider 2d slides relative to the sliding slot 1b1, that is, the slider 2d moves relative to the cross bar 1 b. Then, the motion amplification mechanism 2a is simultaneously connected with the cross bar 1b and the slider 2d, the motion amplification mechanism 2a amplifies the relative motion of the cross bar 1b and the slider 2d, and then drives the inertial damper 2 b.
The motion amplification mechanism 2a comprises a driving end and an output end, the motion distance of the output end is greater than that of the driving end, and the output end of the motion amplification mechanism 2a is connected with the inertial damper 2 b; the motion amplification mechanism 2a is a laborious lever or scissor mechanism or gear train or pulley 2a4 set. The motion amplification mechanism 2a of the embodiment of fig. 2 employs a combination of a laborious lever and pulley 2a4 set. What is used in the embodiment of figure 3 is a combination of a scissors mechanism, a set of pulleys 2a4 and a laborious lever. Other combinations of gear sets and the like are also possible, as may be determined based on actual conditions at the site.
As shown in fig. 2, the motion amplification mechanism 2a comprises two laborious levers, a first lever 2a1 and a second lever 2a2, the first lever 2a1 being mounted on the crossbar 1b and the second lever 2a2 being mounted on the support 1 a; the power arm of the first lever 2a1 is connected to the top of the cable 2c or to a slider 2d on top of the cable 2 c. The resistance arm of the first lever 2a1 is connected to the power arm of the second lever 2a2 via a cable 2a3 and a pulley 2a4, and the resistance arm of the second lever 2a2 is connected to the inertial damper 2 b. Here the ropes 2a3 and the pulley 2a4 mainly play a reversing role.
When the steel cable 2c is a flexible steel cable, the steel cable can only provide tension, so the motion amplification mechanism 2a is also connected with a reset structure 4, and the reset structure 4 can enable the motion amplification mechanism 2a and the inertial damper 2b to return to the original position after the driving force of the motion amplification mechanism 2a is relieved. In particular, this return structure 4 may be a return spring, may be rod-shaped between the power arm of the second lever 2a2 and the seat 1a, or may be provided on the inertial damper 2 b. As shown in fig. 2, firstly, the cross bar 1b of the parallelogram mechanism 1 moves to the left, which causes the steel wire rope to draw the slide block 2d to slide, then the motion amplification structure drives the inertial damper 2b, and the inertial damper 2b in turn can transmit damping force to the parallelogram mechanism 1 to absorb the energy of the building vibration. The inertial damper 2b is driven while the return spring stores energy. When the cross rod 1b of the parallelogram mechanism starts to move rightwards, the reset structure 4 releases energy to drive the motion amplification mechanism 2a to reset.
As shown in fig. 4, the cross beam 5 connected with the cross bar 1b is a building door frame, a wood beam at the top of a window frame or a building structure beam, the cross bar 1b is fixedly connected with a plurality of hoops 3, and the hoops 3 tightly encircle the cross beam 5; cleaning the contact part of the beam 5 and the hoop 3 to remove the corrosion part, and keeping the contact interface of the beam 5 and the hoop 3 flat without local bulges;
the gap between the cross rod 1b and the cross beam 5 is not less than 1cm, the bending rigidity of the cross rod 1b is not less than 3-5 times of that of the connected wood beam, and the material strength is not less than 7-10 times of that of the connected wood beam.
The inertial damper 2b comprises a ball screw, a ball nut, a flywheel and a shell, the shell is installed on the support 1a, the ball nut is rotatably connected to the support 1a through a bearing, the ball screw is matched with the ball nut, the upper end of the ball screw is connected with the output end of the conveying amplification structure, and the flywheel is fixed on the ball nut; the motion amplification mechanism 2a drives the ball screw to twitch along the axis of the ball screw, and the screw nut converts the linear motion of the ball screw into rotation and drives the flywheel to move.
The ball screw and ball nut cooperate to convert translational motion into rotation, and then the ball nut is mounted through the bearing and a flywheel is mounted on the ball nut, the flywheel having rotational inertia providing inertial mass. Wherein the flywheel can be replaced, and the moment of inertia of different flywheels is different, provides different damping effort for inertia damping device 2.
In this embodiment, the hoop plate is arc-shaped, so that the hoop 3 is suitable for a circular wood beam, the wing plate is welded to the arc-shaped hoop plate, two connection holes are formed in the wing plate, and the diameter of the screw fastening assembly in the connection hoop 3, the diameter of the connection holes and the diameter of the bolts in the screw fastening assembly are all 10 mm. The hoop 3 plate comprises a hoop plate and a wing plate, and the hoop 3 plate is made of steel. The thickness of 3 plates of staple bolt is 10mm, and the first half circular arc radius of hoop is 160mm, and the pterygoid lamina is long 50mm, and width 30mm, thickness are 10mm, and the connecting hole is diameter 10mm, and screw thread place cylinder length is 30mm, and the screw thread external diameter is 15mm, and middle part solid abdomen post body length is 100 mm.
The depth of the arc-shaped sliding chute 1b1 is 20mm, and the arc-shaped sliding chute 1b1 is formed by two arcs with the radius of 450mm and 500mm respectively by taking the connecting point of the motion amplification mechanism 2a and the hinged support 1a as the circle center; the slide block 2d is a circular steel block with a diameter of 50mm and a thickness of 20 mm.
As shown in fig. 2, the hinge support 1a of the first lever 2a1 is fixedly connected to the cross bar 1b of the parallel four-bar linkage by a bolt. The hinge point of the first lever 2a1 is connected with the hinge support 1a through a pin shaft at a position 0.2 times longer than the self rod of the upper end point, the upper end of the first lever 2a1 is connected with the sliding block 2d through a pin shaft, the first lever 2a1 and the second lever 2a2 are both made of 355MPa steel, and the hinge support 1a is made of 550MPa steel with yield strength. In this embodiment, the length of the first lever 2a1 is 740mm, the cross section of the first lever 2a1 is 0.1m 0.012m box-shaped, and the bearing diameter at the two ends of the first lever 2a1 is 30 mm.
As shown in fig. 2-3, the upper left end point of the stay cable is connected with the lug plate and the slide block 2d through the pin shaft, and the lower right end point of the stay cable is connected with the hinge shaft of the parallel four-bar linkage mechanism. In this embodiment, cable diameter 10mm, the connection otic placode is 50mm for the internal diameter, and the external diameter is 60 mm's ring, makes the ring inner wall enough smooth, and coefficient of friction is 0.15. The material of the inhaul cable is zinc-5% aluminum-rare earth alloy coating high-strength steel cable 2c, the yield strength is 400MPa, the ultimate strength is 540MPa, and the elastic modulus is 200000 MPa.
In this embodiment, the initial angle of the rope 2a3 with the first lever 2a1 is 75 °, the fixed pulley 2a4 has a diameter of 80mm, and the arc chute 1b1 has a diameter of 12 mm. The cross section of the lever girder is a box-shaped cross section of 0.12m 0.1m 0.012m, the length of the lever girder is 850mm, and the lever girder is connected with the supporting seat at the position of 0.3 times of the length of the lever girder.
Inertial mass determination method for inertial damper of auxiliary stabilizing device of historic building
Determining the optimum inertial mass of its inertial damper 2b for an auxiliary stabilizing device for ancient buildings according to any one of claims 1 to 9, characterized in that it comprises the following steps:
step one, measuring the elastic modulus, the compressive strength and the Poisson ratio of the timber of the building beam 5;
step two, measuring the structural size of the building, and determining the sizes of a support 1a, a cross bar 1b and a side bar 1c of the parallelogram structure by combining the installation position of the parallelogram mechanism 1;
step three, establishing a simulation model according to the data obtained in the step one and the step;
step four, applying horizontal dynamic load to the beam 5 of the simulation model in the step three, then continuously changing the inertial mass of the inertial damper 2b, obtaining response values of the horizontal deformation of the top of the used wood column under different inertial masses, and obtaining a me-u relation curve of the inertial mass me in the inertial mass damper and the horizontal deformation u of the top of the wood beam;
and fifthly, taking the inertia mass value corresponding to the minimum limit umin on the me-u relation curve as the inertia mass of the optimal inertia damper 2 b.
Examples
Selecting a frame structure formed by wood beams and wood columns on one layer of a wooden structure of an ancient building, detecting and obtaining the elastic modulus E1=11000MPa, the compressive strength 60MPa and the Poisson ratio 0.48 of wood by adopting a resiliometer, carrying out a mechanical experiment by adopting similar wood, and obtaining relevant parameters of Q345B steel for a material steel plate of a device for improving the safety and stability performance of the ancient building brick column by adopting the mechanical experiment; the stay cable is made of a zinc-5% aluminum-rare earth alloy coating high-strength steel cable 2c material, and has the ultimate tensile strength sigma u =1670MPa and the elastic modulus E3=160000 MPa; and the friction coefficient mu 2=0.35 between the hoop 3 and the wood beam. Cable diameter d =12mm was selected.
Step two, acquiring the geometric dimension of the historic building structure by using a steel tape and a three-dimensional scanner as follows: the height H =4.08m of the wood column, the section of the column is circular, the diameter is 250mm, and the section of the wood beam is circular with the diameter of 160 mm. The design confirms the parallelogram mechanism size that accords with ancient building support condition to and the motion enlargies structure and enlargies the proportion parameter.
And step three, establishing a historic building simulation analysis model by using the geometrical size and the related parameters of the historic building obtained in the step one and adopting ABAQUS finite element software. Establishing a three-dimensional entity discrete analysis model of the structure of the wooden beam, the wooden column and the device of the historic building through computer analysis software; the tenon-and-mortise connection between the wood beam and the wood column in the analysis model adopts semi-rigid connection, and the friction coefficient mu 1=0.5 between the wood and the hoop 3 is input.
And step four, carrying out horizontal bearing overall process calculation on the simulation analysis model. Applying horizontal dynamic load to the top of the wood beam in the simulation analysis model, continuously increasing the inertial mass of the inertial mass damper, obtaining the response value of the horizontal deformation of the top of the wood column used under different inertial masses, and obtaining the relation curve of the inertial mass me in the inertial mass damper and the horizontal deformation u of the top of the wood beam. The analysis is solved by a Newton-Raphson nonlinear iteration method, and the geometric nonlinear influence of a structural system is taken into account.
And step five, according to the relation curve of the inertial mass me and the horizontal deformation u obtained by calculation in the step four, the horizontal coordinate inertial mass deformation value me1=45.42kg corresponding to the vertical coordinate horizontal load peak point umin on the curve. Taking n =100, setting the points { A1, A2, … …, Ai, … …, A100}, as points on the me-u curve, and the abscissa thereof is {1/100, 2/100, … …, i/100, … …, 100/100 }. times.59.42. Taking =0.97, calculated, { γ 26=0.968, … …, γ 100=0.713} is all < =0.97, and γ 25=0.976, the a25 point is taken as the inertial mass point of the inertial mass damper.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. An auxiliary stabilizing device for an ancient building is characterized by comprising a support (1 a) fixed to a building foundation (6) at the lower part and a rigid cross rod (1 b) fixed to a building cross beam (5) at the upper part, wherein side rods (1 c) are hinged to the left end and the right end of the cross rod (1 b), the bottoms of the side rods (1 c) are hinged to the support (1 a), and a parallelogram mechanism (1) is enclosed by the support (1 a), the cross rod (1 b) and the two side rods (1 c);
a damping device (2) is arranged between two hinge points at the diagonal position of the parallelogram mechanism (1), and the damping device (2) comprises a motion amplification mechanism (2 a) and an inertial damper (2 b); when the cross rod (1 b) moves relative to the base, the distance between two hinge points of the parallelogram structure opposite to the diagonal positions changes, and the motion amplification mechanism (2 a) increases the motion amount of the two hinge points and drives the inertial damper (2 b) to move.
2. The auxiliary stabilizing device for ancient buildings according to claim 1, characterized in that two sets of damping devices (2) are symmetrically arranged on the parallelogram structure from left to right, and the two sets of damping devices (2) are respectively connected with two sets of hinge points at opposite angles of the parallelogram mechanism (1).
3. The auxiliary stabilizing device for the ancient building according to claim 1, characterized in that the damping device (2) further comprises a steel cable (2 c), two ends of the steel cable (2 c) are respectively arranged at two hinge points of the parallelogram mechanism (1) which are opposite to each other in the diagonal positions; the bottom of the steel cable (2 c) is connected with one end of the support (1 a), and the top of the steel cable (2 c) is connected with the other end of the cross rod (1 b);
the cross rod (1 b) is provided with a sliding groove (1 b 1), the upper end of the steel cable (2 c) is connected with a sliding block (2 d) which is in sliding fit with the sliding groove (1 b 1), the motion amplification mechanism (2 a) is connected with the upper end of the steel cable (2 c), and the motion amplification mechanism (2 a) is driven to move by the upper end of the steel cable (2 c).
4. The auxiliary stabilizing device for the historic building is characterized in that the motion amplification mechanism (2 a) comprises a driving end and an output end, the motion distance of the output end is larger than that of the driving end, and the output end of the motion amplification mechanism (2 a) is connected with an inertial damper (2 b);
the motion amplification mechanism (2 a) is a labor-consuming lever or a scissor fork mechanism or a gear set or a pulley block.
5. An auxiliary stabilizing device for ancient buildings according to claim 4, characterized in that said motion amplification mechanism (2 a) comprises two laborious levers, a first lever (2 a 1) and a second lever (2 a 2), said first lever (2 a 1) being mounted on the crossbar (1 b) and said second lever (2 a 2) being mounted on the support (1 a); the power arm of the first lever (2 a 1) is connected with the top of the cable (2 c), the resistance arm of the first lever (2 a 1) and the power arm of the second lever (2 a 2) are connected with the pulley (2 a 4) through the rope (2 a 3), and the resistance arm of the second lever (2 a 2) is connected with the inertial damper (2 b).
6. The auxiliary stabilizing device for the historic building is characterized in that the motion amplification mechanism (2 a) is further connected with a reset structure (4), and the reset structure (4) can enable the motion amplification mechanism (2 a) and the inertia damper (2 b) to return to the original position after the driving force of the motion amplification mechanism (2 a) is relieved.
7. The auxiliary stabilizing device for the historic building according to claim 1, wherein the cross beam (5) connected with the cross rod (1 b) is a wooden beam or a building structure beam at the top of a building door frame or a window frame, a plurality of hoops (3) are fixedly connected with the cross rod (1 b), and the hoops (3) encircle the cross beam (5); the contact part of the cross beam (5) and the hoop (3) is cleaned to remove the corrosion part, and the contact interface of the cross beam (5) and the hoop (3) is kept flat without local bulges.
8. The auxiliary stabilizing device for the historic building is characterized in that the gap between the cross rod (1 b) and the cross beam (5) is not less than 1cm, the bending rigidity of the cross rod (1 b) is not less than 3-5 times of the bending rigidity of the connected wooden beam, and the material strength is not less than 7-10 times of the material strength of the connected wooden beam.
9. The auxiliary stabilizing device for the historic building is characterized in that the inertial damper (2 b) comprises a ball screw, a ball nut, a flywheel and a shell, the shell is installed on the support (1 a), the ball nut is rotatably connected to the support (1 a) through a bearing, the ball screw is matched with the ball nut, the upper end of the ball screw is connected with the output end of the conveying amplifying structure, and the flywheel is fixed on the ball nut;
the motion amplification mechanism (2 a) drives the ball screw to twitch along the axis of the ball screw, and the screw nut converts the linear motion of the ball screw into rotation and drives the flywheel to move.
10. A method for determining inertial mass of inertial damper of auxiliary stabilizing device of ancient architecture, aiming at auxiliary stabilizing device of ancient architecture as claimed in any one of claims 1-9 for determining optimal inertial mass of inertial damper (2 b) thereof, characterized by comprising the following steps:
step one, measuring the elastic modulus, the compressive strength and the Poisson ratio of wood of a building beam (5);
secondly, measuring the structure size of the building, and determining the sizes of a support (1 a), a cross bar (1 b) and a side bar (1 c) of the parallelogram structure by combining the installation position of the parallelogram mechanism (1);
step three, establishing a simulation model according to the data obtained in the step one and the step;
step four, applying horizontal dynamic load to the cross beam (5) of the simulation model obtained in the step three, then continuously changing the inertial mass of the inertial damper (2 b), obtaining response values of horizontal deformation of the top of the used wood column under different inertial masses, and obtaining a me-u relation curve of the inertial mass me in the inertial mass damper and the horizontal deformation u of the top of the wood beam;
and fifthly, taking the inertia mass value corresponding to the minimum limit umin on the me-u relation curve as the inertia mass of the optimal inertia damper (2 b).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118814996A (en) * | 2024-06-26 | 2024-10-22 | 浙江大学 | A distributed tuned inertial damper and control method for high-rise buildings based on double-layer curtain walls |
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