CN2806599Y

CN2806599Y - Shape memory alloy and friction composite damper

Info

Publication number: CN2806599Y
Application number: CN 200520112365
Authority: CN
Inventors: 薛素铎; 王利; 庄鹏; 石光磊
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2005-07-08
Filing date: 2005-07-08
Publication date: 2006-08-16
Anticipated expiration: 2015-07-08

Abstract

The utility model relates to a shape memory alloy and friction composite damper, which belongs to the field of antivibration and shock absorption, overcomes the defects of insufficient energy consumption capability and poor self reset capability of an existing damper, and comprises connecting rods (3) and friction pads (9). The utility model is characterized in that the four connecting rods (3) are formed into a rectangular deformation mechanism, prepared connecting pieces (5) are clamped between superposed parts of each angle part connecting rod (3) of the rectangular deformation mechanism, and one set of friction pad (9) is arranged between both positive and negative faces of the prepared connecting pieces (5) and the connecting rods (3). Each angle part of the rectangular deformation mechanism is composed of the connecting rods (3), the prepared connecting pieces (5) and the friction pads (9) concentrically connected in an order of (3)-(9)-(5)-(3) through high strength bolts (8), and at the same time, each angle part of the rectangle formed by the connecting rods (3) is connected with clamps (7) used for fixing two sets of SMA wires (6) at the diagonal direction of the rectangle through the high strength bolts (8). The utility model has the advantages of strong capability of energy consumption, simple structure, convenient installation and strong self reset capability.

Description

Marmem-friction composite damper

Technical field:

The utility model is a kind of marmem-friction composite buffer, belongs to building structure aseismatic, cushion technique field.

Background technology:

In building construction vibration control field, passive energy dissipative device (damper) has advantages such as cost is low, easy to installation and maintenance, control is effective, applied range, thereby has been subjected to domestic and international Structural Engineering and earthquake engineering scholar's abundant attention.The kind of energy consumer is more, mainly contains several classes such as frcition damper, viscoelastic damper, viscous damper, mild steel damper and oil damper,

Marmem (Shape Memory Alloy is called for short SMA) is a kind of new function material with shape memory effect, superelastic effect and high damping characteristic.Compare with the damper that adopts ordinary metallic material to make, passive damping utensil based on the exploitation of super elastic shape memory alloy hysteretic characteristic has durability and corrosion resistance and good, the operating period limit for length, energy dissipation capacity is strong, and distortion is than series of advantages such as big and distortion can recover.

Nineteen eighty-two " Journal of Structural Division, ASCE " " Response ofFriction Damped Braced Frames " literary composition Pall frcition damper (organigram as shown in Figure 1) has been proposed first, the deformation mechanism that the Pall frcition damper is mainly surrounded by connecting rod 3 and being intersects the friction pad arranged and is slidingly connected and 2 forms, when meeting with violent earthquake, the rectangle mechanism that connecting rod 3 is formed can produce the rigid body distortion in the horizontal direction and drive arranged in a crossed manner being slidingly connected and 2 move along the diagonal of rectangle mechanism, be slidingly connected 2 by the sliding friction dissipation energy, reduce the vibration of agent structure.Engineering practice shows that the Pall frcition damper has certain energy-dissipating and shock-absorbing effect to building structure, and however, the Pall frcition damper still exists such as not having runback potential energy power, power consumption defectives such as effect is remarkable inadequately.

Summary of the invention:

Main purpose of the present utility model is in order to overcome damper energy dissipation capacity deficiency in the prior art, and the defective of two aspects such as runback position ability proposes a kind of marmem-friction composite buffer (hereinafter to be referred as composite buffer).

The technical solution of the utility model is seen Fig. 2, it includes connecting rod 3, friction shim 9, be characterised in that: four connecting rods 3 surround a rectangle deformation mechanism, intersection between each bight connecting rod 3 of rectangle deformation mechanism clips reserves connector 5, between the tow sides of reserving connector 5 and connecting rod 3 one group of friction shim 9 is set, promptly each bight of rectangle deformation mechanism is connected connecting rod 3, reservation connector 5 with friction shim 9 by high-strength bolt 8 with one heart according to the order of 3-9-5-9-3.Simultaneously, two groups of shape-memory alloy wires 6 that are used for fixing the rectangle diagonal by each bight of rectangle that connecting rod 3 encloses by high-strength bolt 8 jockeies 7.

Its bight of the above-mentioned composite buffer that is used for building structure reserve connect 5 and support 1 link to each other with the fabric structure member.According to the needs of fabric structure form, composite buffer can adopt the arrangement form of two-way support, and promptly the reservation connector 5 along two diagonals of composite buffer quadrangle deformation mechanism is connected with support 1 simultaneously; Also can adopt the arrangement of unidirectional support, promptly link to each other with support 1 along reservation connector 5 of quadrangle deformation mechanism to the angle direction.The structural form of composite buffer own is all identical with operating principle in above-mentioned two kinds of arrangements.

Composite buffer based on above technical scheme carries out prestretched to all alloy silks before use, easily produce the position of relative displacement then in building structure by support and connection, interlayer as frame construction, its concrete course of work is: wind carry or little shake effect under, outer connection support is less by the external loads (being the suffered external force of composite buffer) that the reservation connector passes to composite buffer, be not enough to overcome the sliding power (maximum static friction force) of rising of friction shim, this moment, composite buffer was not worked, it can equivalence be common support structure, and whole building utilizes the outside dynamic load of ductility opposing of self.When meeting with violent earthquake, outer connection is supported by reserving connector external loads is passed to composite buffer, the sliding power threshold value that the external force that is subjected to when composite buffer provides greater than its friction shim, reserve connector and be out of shape, enter duty prior to building structural element by the linkage generation rigid body that high-strength bolt drives composite buffer.Because connecting rod is connected by high-strength bolt equally with one heart with alloy silk anchor clamps, so just cause one group of shape-memory alloy wire to be stretched and be in stress state, another group shape-memory alloy wire then is in unloaded state, thereby two groups of shape-memory alloy wires are in structural vibration and add unloaded state repeatedly and form stable super-elasticity hysteresis; Meanwhile, the frictional force that also rotates between friction shim, frictional force direction the movement tendency direction with composite buffer all the time are opposite.In a word, under shock effect consumingly, friction shim and shape-memory alloy wire co-operation rely on super-elasticity hysteretic energy and friction energy-dissipating effectively to improve the damping of building structure, effectively realize the damping control of building structure.After earthquake motion finished, because the recoverable deformation of shape-memory alloy wire super-elasticity is very big, ultimate strength was high, can help composite buffer to recover its original-shape.

This composite buffer that is used for building structure adopts the shape memory alloy material that is in austenitic state under the normal temperature usually; Friction material adopts the copper steel friction usually, also can adopt other stable performance, durable friction material.

In sum, the utlity model has strong, the simple structure, easy for installation of energy dissipation capacity, have necessary advantages such as runback potential energy power, can remedy many deficiencies of prior art.

Description of drawings:

Fig. 1, Pall frcition damper organigram;

Fig. 2 (a), reservation connector schematic diagram of the present utility model;

Fig. 2 (b), friction shim schematic diagram of the present utility model;

Fig. 2 (c), connecting rod schematic diagram of the present utility model;

Fig. 3, elevation of the present utility model;

Fig. 4, lateral view of the present utility model

Fig. 5, hysteresis loop of the present utility model;

Fig. 6, the utility model bidirectional arrangements schematic diagram;

Fig. 7, the unidirectional layout schematic diagram of the utility model;

Among the figure: 1, connect to support 2, friction pad is slidingly connected 3, connecting rod 4, lid 5, reserve connector 6, shape-memory alloy wire 7, alloy silk anchor clamps 8, high-strength bolt 9, friction shim

The specific embodiment:

Enforcement of the present utility model adopts existing processing and mounting technology to make according to Fig. 3.For the superelastic properties of giving full play to shape memory alloy material with avoid shape-memory alloy wire pressurized flexing in the work engineering, before using composite buffer, need shape-memory alloy wire is carried out pre-stretch-draw.Can realize the pre-stretch-draw of shape-memory alloy wire according to having known technology now, the shape-memory alloy wire after the prestretched is fixed in the composite buffer by alloy silk anchor clamps.Shape-memory alloy wire prestretching strain value recommends to be stretched to the half value of the maximum stretching strain of a material, and promptly the silk material is in the mid point of super-elasticity platform.

In this composite buffer, the shape-memory alloy wire diameter of selecting for use is set by known technology, and technology is carried out the processing of memory alloy material routinely.Consider the correlation of memory alloy material service behaviour and temperature, can determine memorial alloy austenite characteristic temperature A according to the difference of building location _f,, make it give full play to superelastic properties to guarantee that material keeps austenitic state in most cases.

In addition, the selection of friction shim will be satisfied requirements such as stability, durability, economy, and position as shown in Figure 4

Carry out theory analysis gained Damper Control power hysteresis loop as shown in Figure 5 according to the operating principle of composite buffer.The full degree of the displacement of damper-restoring force envelope of curve area has reflected the power consumption level of damper, and displacement of the present utility model as seen from Figure 5-restoring force envelope of curve area is very full, illustrates that energy dissipation capacity of the present utility model is fine.

The utility model arrangement such as Fig. 6, shown in Figure 7 in building structure, wherein Fig. 6 is a bidirectional arrangements, wherein Fig. 7 is unidirectional layout.

Claims

1, a kind of marmem-friction composite damper, it includes connecting rod (3), friction shim (9), it is characterized in that: four connecting rods (3) surround a rectangle deformation mechanism, intersection between each bight connecting rod (3) of rectangle deformation mechanism clips reserves connector (5), between the tow sides of reserving connector (5) and connecting rod (3) one group of friction shim (9) is set, promptly high-strength bolt (8) is passed through with connecting rod (3) according to the order of (3)-(9)-(5)-(9)-(3) in each bight of rectangle deformation mechanism, reserving connector (5) is connected with one heart with friction shim (9); Simultaneously, each bight of being enclosed rectangle by connecting rod (3) is used for fixing two groups of SMA silks (6) of rectangle diagonal by high-strength bolt (8) jockey (7).