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Title:
SLIDING RUBBER DAMPER
Document Type and Number:
WIPO Patent Application WO/2016/028137
Kind Code:
A1
Abstract:
A sliding rubber damper (100) comprises of a plurality of metal parts (102), each of the plurality of metal parts (102) having a square part (202) with an extended rectangular arm (204), a plurality of rubber parts (104), a plurality of connection plates (106). Each of the plurality of rubber parts (104) is sandwiched between the square parts (202) of at least two adjacent pluralities of metal parts (102) and the rectangular arm (204) of each of the plurality of metal parts (102) is orthogonally coupled with the plurality of connection plates (106) by a coupling means.

Inventors:
Meldi Suhatril (Department of Civil Engineering, Faculty of EngineeringUniversity of Malaya, Kuala Lumpur, 50603, MY)
Mahdi Shariati (Faculty of Engineering, University of Malaya, Kuala Lumpur, 50603, MY)
Hamed Khatibi (Faculty of Engineering, University of Malaya, Kuala Lumpur, 50603, MY)
Amir Fateh (Department of Civil Engineering, Faculty of EngineeringUniversity of Malaya, Kuala Lumpur, 50603, MY)
Application Number:
MY2015/000073
Publication Date:
February 25, 2016
Filing Date:
September 01, 2015
Export Citation:
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Assignee:
UNIVERSITY OF MALAYA (University of Malaya, Kuala Lumpur, 50603, MY)
International Classes:
F16F15/04; E04B1/58; E04H9/02
Foreign References:
JP2011256577A2011-12-22
JP2011038312A2011-02-24
Attorney, Agent or Firm:
Tee Lin Yik (Suite 32-1 & 32-2Jalan Dwitasik, Dataran Dwitasi, Bandar Sri Permaisuri Kuala Lumpur, 56000, MY)
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Claims:
Claims:

1. A sliding rubber damper (100) comprising:

a plurality of metal parts (102), each of said plurality of metal parts (102) having a square part (202) and an extended rectangular arm (204)

a plurality of rubber parts (104)

a plurality of connection plates (106)

wherein each of said plurality of rubber parts (104) is sandwiched between said square parts (202) of at least two adjacent said plurality of metal parts (102)

wherein said rectangular arm (204) of each of said plurality of metal parts (102) is orthogonally coupled with said plurality of connection plates (106) by a coupling means.

2. The sliding rubber damper (100) as claimed in Claim 1 , wherein said square parts of each of said plurality of metal parts (102) are arranged in parallel to each other and said rectangular arm (204) of said plurality of metal parts (102) alternatively arranged in opposite directions to each other.

3. The sliding rubber damper (100) as claimed in Claim 2, wherein said plurality of metal parts (102) is made of steel.

4. The sliding rubber damper (100) as claimed in Claim 3, wherein said plurality of metal parts (102) is made by a laser cutting technique. 5. The sliding rubber damper (100) as claimed in Claim 1 , wherein said plurality of rubber parts (104) is composed of a natural rubber.

6. The sliding rubber damper (100) as claimed in Claim 1 , wherein said plurality of connection plates (106) is configured to have a shape of a rectangle.

7. The sliding rubber damper (100) as claimed in Claim 1, wherein said coupling means is a welding technique.

8. The sliding rubber damper (100) as claimed in Claim 1 , wherein said plurality of connection plates (106) are orthogonally welded with said rectangular arm (204) of each of said plurality of metal parts (102) on opposite sides.

9. The sliding rubber damper (100) as claimed in Claim 1 , wherein said plurality of connection plates (106) of said sliding rubber damper (100) is configured to couple said sliding rubber damper (100) with a brace (506, 506') of a building frame (500). 10. The sliding rubber damper (100) as claimed in Claim 9, wherein said plurality of connection plates (106) further comprises of a plurality of bolts (402).

11. The sliding rubber damper (100) as claimed in Claim 9, wherein said coupling of said sliding rubber damper (100) with said building frame (500) is enabled by connecting said brace (506, 506') of said building frame (506, 506') and said plurality of bolts (402) of each of said plurality of connection plates (106).

Description:
Title: Sliding Rubber Damper

Technical Field:

Embodiments of the present invention generally relate to structural control devices, and more particularly, to a sliding rubber damper which employs passive energy dissipation technique and increases overall lateral stiffness of the structure.

Background Art:

In recent years, significant research and development has been carried out in respect of structural control devices, especially alleviation of wind and seismic response of buildings and bridges. In both the areas, serious efforts have been undertaken to develop the structural control concept into a workable technology, and today many such devices have been installed in a wide variety of structures. In other words, control of excessive vibrations of tall buildings and other structures subjected to serious ecological loads, for example, wind and tremor is of specific significance to structural designers and has gained significant consideration lately.

Dampers have been found effective in reducing the response of structures subjected to dynamic loads. In particular, viscoelastic (VE) dampers have been successfully incorporated in a number of tall buildings as a viable energy dissipating system to suppress wind and earthquake induced motion of building structures. The viscoelastic dampers are found effective in suppressing structural motions with definite advantages over other damping devices including ease, simple taking care of and basically no upkeep necessities. CN201901957U titled "Novel Energy-Dissipating and Shock-Absorbing Damper" talks about an energy-dissipating and shock-absorbing damper, which has the characteristics of high stiffness, strong deformability and strong energy dissipation capacity.

JP2002161648A titled "Seismic Control Building" discloses a seismic control building, wherein all columns are vertically cut from a specific intermediate layer and rubber laminates are interposed between upper and lower cut column portions of the respective cut columns. Further, the horizontal rigidity of the intermediate layer is lowered relative to the other layers. Thus, the intermediate layer is set as a deformation concentration layer in which a large deformation is produced due to concentration of deformations at the time of an earthquake.

CN202468813U titled "Rubber Damper" discloses a rubber damper wherein rotation-prevention ribs are uniformly distributed on the inner wall of a casing of the rubber damper. Further, the ribs are connected with the casing through welding and have smooth arc surfaces.

All the aforesaid documents talk about dampers suppressing wind and earthquake induced motion of building structures. However, said dampers still possess number of shortcomings, such as inefficient suppression of severe vibration and ground motion, not enough lateral stiffness of structure under dynamic load, and further they are not economical.

Accordingly, there remains a need in the prior arts to have a damper which overcomes the aforesaid problems and shortcomings. However, there remains a need in the art for a sliding rubber damper which employs passive structural controller technique and increases overall lateral stiffness of structure under dynamic loads. Further, the damper offers additional damping characteristics at a specified range of frame lateral displacement.

Disclosure of the invention:

Embodiments of the present invention aim to provide a sliding rubber damper. The innovative sliding rubber damper provides enough lateral resistance stiffness for structure against earthquake, as shear frames, to fulfill the architectural and the structural demand. Further, manufacturing of the sliding rubber damper is economical as the same uses natural rubber as one of the core component. The sliding rubber damper is provided with the features of Claim 1 , however the invention may additionally reside in any combination of features of Claim 1. In accordance with an embodiment of the present invention, the sliding rubber damper comprises of a plurality of metal parts where each of the plurality of metal parts has a square part and an extended rectangular arm, a plurality of rubber parts, and a plurality of connection plates. Further, each of the plurality of rubber parts is sandwiched between the square parts of at least two adjacent pluralities of metal parts. Also, the rectangular arm of each of the plurality of metal parts is orthogonally coupled with the plurality of connection plates by a coupling means.

In accordance with an embodiment of the present invention, the square parts of each of the plurality of metal parts are arranged in parallel to each other and the rectangular arm of the plurality of metal parts alternatively arranged in opposite directions to each other. In accordance with an embodiment of the present invention, the plurality of metal parts is made of, but not limited to, steel. Further, the plurality of metal parts is made by, but not limited to, a laser cutting technique. In accordance with an embodiment of the present invention, the plurality of rubber parts is composed of, but not limited to, a natural rubber.

In accordance with an embodiment of the present invention, the plurality of connection plates are configured to have a rectangular shape.

In accordance with an embodiment of the present invention, the coupling means is, but not limited to, a welding technique.

In accordance with an embodiment of the present invention, the plurality of connection plates are orthogonally welded with the rectangular arm of each of the plurality of metal parts on opposite sides.

In accordance with an embodiment of the present invention, the plurality of connection plates further comprises of a plurality of bolts.

In accordance with an embodiment of the present invention, the plurality of connection plates of the sliding rubber damper is configured to couple the sliding rubber damper with a brace of a building frame. In accordance with an embodiment of the present invention, the coupling of the sliding rubber damper with the building frame is enabled by connecting the brace of the building frame and the plurality of bolts present on each of the plurality of connection plates.

In accordance with an embodiment of the present invention, the building frame further comprises of a horizontal beam, two vertical columns and one end of the brace is connected diagonally at intersections of the horizontal beam and the vertical columns.

While the present invention is described herein by way of example using several embodiments and illustrative drawings, those skilled in the art will recognize that the invention is neither intended to be limited to the embodiments of drawing or drawings described, nor intended to represent the scale of the various components. Further, some components that may form a part of the invention may not be illustrated in certain figures, for ease of illustration, and such omissions do not limit the embodiments outlined in any way. It should be understood that the drawings and detailed description thereto are not intended to limit the invention to the particular form disclosed, but on the contrary, the invention covers all modification/s, equivalents and alternatives falling within the scope of the present invention as defined by the appended claims. The headings are used for organizational purposes only and are not meant to limit the scope of the description or the claims. As used throughout this description, the word "may" is used in a permissive sense (i.e. meaning having the potential to), rather than the mandatory sense (i.e. meaning must). Further, the words "a" or "an" mean "at least one" and the word "plurality" means one or more, unless otherwise mentioned. Furthermore, the terminology and phraseology used herein is solely used for descriptive purposes and should not be construed as limiting in scope. Language such as "including," "comprising," "having," "containing," or "involving," and variations thereof, is intended to be broad and encompass the subject matter listed thereafter, equivalents, and any additional subject matter not recited, and is not intended to exclude any other additives, components, integers or steps. Likewise, the term "comprising" is considered synonymous with the terms "including" or "containing" for applicable legal purposes. Any discussion of documents, acts, materials, devices, articles and the like is included in the specification solely for the purpose of providing a context for the present invention.

In this disclosure, whenever an element or a group of elements is preceded with the transitional phrase "comprising", it is understood that we also contemplate the same element or group of elements with transitional phrases "consisting essentially of, "consisting", "selected from the group consisting of, "including", or "is" preceding the recitation of the element or group of elements and vice versa. Description of drawings and best mode for carrying out the invention:

So that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings only illustrate typical embodiments of this invention and are therefore not to be considered limiting its scope, for the invention may extend to other equally effective embodiments.

These and other features, benefits and advantages of the present invention will become apparent by reference to the following text figures, with like reference numbers referring to like structures across the views, wherein: Fig. 1 is a prospective view of a sliding rubber damper in accordance with an embodiment of the present invention.

Fig. 2 illustrates a metal part of the sliding rubber damper as shown in Fig. 1.

Fig. 3 illustrates a rubber part of the sliding rubber damper as shown in Fig. 1. Fig. 4 illustrates a connection plate of the sliding rubber damper as shown in

Fig. 1.

Fig. 5 is a prospective view of a building frame employing the sliding rubber damper as shown in Fig. 1 in accordance with an exemplary embodiment of the present invention. Fig. 6 is a graph depicting hysteresis curves of a bare building frame and the frame with the sliding rubber damper as shown in Fig. 5.

The present invention is described hereinafter by various embodiments with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiment set forth herein. Rather, the embodiment is provided so that this disclosure will be thorough and complete and will fully convey the scope of the invention to those skilled in the art. In the following detailed description, numeric values and/or ranges are provided for various aspects of the implementations described. These values and/or ranges are to be treated as examples only, and are not intended to limit the scope of the claims. In addition, a number of materials are identified as being suitable for various facets of the implementations. These materials are to be treated as exemplary, and are not intended to limit the scope of the invention.

Embodiments of the present invention aim to provide a sliding rubber damper which is apposite to provide enough lateral resistance stiffness for structure against earthquake, as shear frames, to fulfill the architectural and the structural demand. The novel sliding rubber damper employs innovative passive structural controller technique which increases overall lateral stiffness of structure under dynamic loads. Further, the disclosed sliding rubber damper provides additional damping characteristics at a specified range of frame lateral displacement. Also, manufacturing of the sliding rubber damper is economical as the same uses natural rubber as one of the core component.

Referring to the drawings, the invention will now be described in more detail. In accordance with an embodiment of the present invention, a sliding rubber damper (100), as shown in Figure 1, comprises of a plurality of metal parts (102), plurality of rubber parts (104) and a plurality of connection plates (106).

In accordance with an embodiment of the present invention, the metal part (102), as shown in Figure 2, comprises of a square part (202) and an extended rectangular arm (204). The dimensions of the square part (202) and the rectangular arm (204) vary with dimensions of structure where the sliding rubber damper (100) is to be installed.

In accordance with an embodiment of the present invention, the metal part (102) is made up of, but not limited to, steel. Further, the metal part (102) is manufactured by, but not limited to, a laser cutting technique. In accordance with an embodiment of the present invention, the rubber part (104), as shown in Figure 3, is having a shape of, but not limited to, a square. Further, the dimensions of the rubber part (104) depend on dimensions of the metal part (102) as well as the structure where the sliding rubber damper (100) is to be installed.

In accordance with an embodiment of the present invention, the rubber part (104) is composed of, but not limited to, a natural rubber.

In accordance with an embodiment of the present invention, the connection plate (106), as shown in Figure 4, is having a shape of, but not limited to, a rectangle. As mentioned above, the connection plates (106) are welded with the plurality of metal parts (102). Further, the connection plate (106) comprises of plurality of bolts (402) in order to connect the sliding rubber damper (100) with a brace (as shown in Figure 5). As shown in Figure 1 , each of the plurality of rubber parts (104) is sandwiched between the square parts (202) of at least two adjacent pluralities of metal parts (102). For example, as shown in the figure, the rubber part ( 04) is sandwiched between two metal parts (102). However, the arrangement of rubber parts (104) and metals parts (102) may vary in accordance with structural demands.

In accordance with an embodiment of the present invention, the square parts (202) of each of the plurality of metal parts (102) are arranged in parallel to each other and the rectangular arm (204) of the square parts (204) are arranged alternatively in opposite direction to each other. In accordance with an embodiment of the present invention, the rectangular arm (204) of each of the plurality of metal parts (102) is orthogonally coupled with the plurality of connection plates (106) by a coupling means, such as a welding technique. In other words, the plurality of connection plates are orthogonally welded with the rectangular arm (204) of each of the plurality of metal parts (102) on opposite sides. However, the arrangement of metal parts (102) and connection plates (106) may vary in accordance with structural demands.

Figure 5 is a prospective view of a building frame (500) employing the sliding rubber damper (100) as shown in Figure 1 in accordance with an exemplary embodiment of the present invention. In the Figure 5, the building frame (500) comprises of a horizontal beam (502), two vertical columns (504, 504') and a brace (506, 506'). The properties and characteristics of the horizontal beam (502), the two vertical columns (504, 504') and the brace (506, 506') are well known in the art and not described here for sake of brevity.

In accordance with an embodiment of the present invention, as shown in Figure 5, the sliding rubber damper (100) is connected with the brace (506, 506') by means of the connection plates (106). The connection plates (106) engage the brace (506, 506') by virtue of plurality of bolts (402) present on each of the connection plates (106).

Further, the brace (506, 506') is connected diagonally at intersections (508, 508') of the horizontal beam (502) and the two vertical columns (504, 504'). Figure 6 is a graph depicting hysteresis curves of a bare building frame and the building frame (500) with the sliding rubber damper (100) as shown in Figure 5. As can be seen from the hysteresis curve relating to the building frame (500) with the sliding rubber damper (100), the maximum failure capacity was enhanced. In other words, the hysteresis curve area furnished by the building frame (500) employing the Sliding Rubber Damper (100) as compared with hysteresis curve area by the bare building frame has increased, therefore it can be justified that the energy dissipation capacity which is one of the most crucial demand in earthquake engineering has enhanced. Also maximum failure capacity increases to 14% when the Sliding Rubber Damper (100) is used in the building frame (500).

The above-mentioned novel sliding rubber damper overcomes the problems and shortcoming of the existing dampers and provides number of advantages over them. This product is appropriate for high-rise building, which are located in seismic and wind regions, such as Sarawak in Malaysia, to diminish the structural damage and ensure structure stability during the vibration load such as wind and earthquake. On the other hand, the main component of the disclosed sliding rubber damper is the rubber part and the raw material for manufacturing the same is available in abundance globally, especially in Asian countries. Thereby, the novel sliding rubber damper has shown enough capability to put into practice as cheap and useful supplementary product to install in new and existing structure to mitigate and eliminate the structural damage. Furthermore, implementing of sliding rubber damper leads to increase the overall failure capacity and enhance energy dissipation characteristic. In addition to the above, the disclosed sliding rubber damper provides enough lateral resistance stiffness for structure against earthquake as shear frames, to fulfill the architectural and the structural demand. The novel combination of the rubber part and the metal part in the disclosed sliding rubber damper which is connected to the brace element to dissipate the lateral force same as earthquake. As can be confirmed from hysteresis curves mentioned above, the ductility attribute and energy dissipation capacity of building frame has enhanced as compared to the bare building frame. Hence, the novel sliding rubber damper may be used as an alternative technique for rehabilitation of existing steel structures.

The exemplary implementation described above is illustrated with specific shapes, dimensions, and other characteristics, but the scope of the invention includes various other shapes, dimensions, and characteristics. For example, the particular shape of the rubber part, metal part, connection plate could be of appropriate sizes for any particular combination of various parts of the sliding rubber damper. Also, the components as described above could be manufactured in various other ways and could include various other materials, including various other metals.

Similarly, the exemplary implementations described above include specific examples of sliding rubber damper having number of rubber parts sandwiched between number of metal parts etc. but any other appropriate parts, alone or in combination, could also be employed. Further, the above exemplary implementations describe a specific arrangement of various components of the sliding rubber damper, but a wide variety of other such arrangement of components could be used within the scope of the invention, including additional steps, omitting some steps, or performing process in a different order. Various modifications to these embodiments are apparent to those skilled in the art from the description and the accompanying drawing. The principles associated with the various embodiments described herein may be applied to other embodiments. Therefore, the description is not intended to be limited to the embodiments shown along with the accompanying drawings but is to be provided broadest scope consistent with the principles and the novel and inventive features disclosed or suggested herein. Accordingly, the invention is anticipated to hold on to all other such alternatives, modifications, and variations that fall within the scope of the present invention and appended claims.