WO2007001103A1 - Girder bridge protection device using sacrifice mems - Google Patents
Girder bridge protection device using sacrifice mems Download PDFInfo
- Publication number
- WO2007001103A1 WO2007001103A1 PCT/KR2005/002098 KR2005002098W WO2007001103A1 WO 2007001103 A1 WO2007001103 A1 WO 2007001103A1 KR 2005002098 W KR2005002098 W KR 2005002098W WO 2007001103 A1 WO2007001103 A1 WO 2007001103A1
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- WO
- WIPO (PCT)
- Prior art keywords
- support member
- auxiliary support
- bridge
- protection device
- sacrifice
- Prior art date
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/04—Bearings; Hinges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
Definitions
- the present invention relates, in general, to a device for protecting a bridge, and, more particularly, to an girder bridge protection device using sacrifice means which functions to support loads normally applied to a bridge and to dissipate energy through plastic behavior caused by sacrificing a symmetrically structured main support member when a seismic load is applied, thereby protecting the remaining main parts of the bridge.
- sacrifice means is a member implementing the concept of a passive energy dissipation device.
- the member serves as a secondary element which plays a structural role while an earthquake does not occur.
- the member plays a role of passively dissipating energy generated in a structure and thereby improving girder performance.
- the metallic yield dampers function to dissipate energy generated in a structure by a seismic load, using a nonlinear behavior characteristic of a metal.
- Devices which are generally used adopt an ADAS (added damping and stiffness) method in which an X-shaped or triangular steel plate is used so as to evenly distribute plastic deformation over the entire member.
- Other devices have a honeycomb-shaped configuration which is mainly adopted in Japan, employ shear panels, and are formed of lead, shape-memory alloy, etc. which are different from steel (Aiken et al., 1992).
- an unbonded brace (tension/compression yielding brace) is used.
- the unbonded brace is composed of a steel section for dissipating energy by axial force and a tube filled with concrete to resist buckling due to compressive force (Wada, 1999; Clark, 1999; and Kalyanaraman et al., 1998).
- the friction dampers serve as devices which dissipate energy generated in structures by seismic loads using frictional force generated between two objects. That is to say, the friction dampers dissipate energy using frictional force generated in the device by compressive and tensile force.
- a hysteresis loop of the friction damper reaches a square due to the characteristic of coulomb friction.
- the viscoelastic dampers function to dissipate energy generated in a structure mainly using shearing deformation of copolymer, a glass material, etc. (Chang et al., 1994; Shen et al., 1995; and Lai et al., 1995).
- the viscous fluid devices are largely divided into viscous walls and VF dampers.
- the viscous walls are devices in which energy is dissipated while a plate is moved between thin steel plates filled with viscous liquid.
- the viscous walls have been used for military and aviation purposes and recently have been applied to civil-engineered structures.
- the VF dampers comprise a piston which is defined with an orifice and which moves in a cylinder filled with highly viscous material such as silicon and oil (Constantinou et al., 1993).
- the VF dampers function to dissipate energy generated by a seismic load, through the movement of the piston which is caused due to the operating principle of the orifice.
- the VF damper is used along with an girder isolation base.
- the tuned mass dampers and the tuned liquid dampers use specified masses or liquids to decrease the sizes of responses under specified modes.
- active mass dampers which are a kind of active control system, rather than a passive control system.
- the devices for improving girder performance as described above are limitedly used in bridge structures and have mainly been developed so as to be used for constructional structures (Zahrai et al., 1999).
- sacrifice means which performs a predetermined structural function to serve as a secondary member while an earthquake does not occur and which passively dissipates energy generated in a structure to improve girder performance when a seismic load is applied.
- shear keys and ductile bracings which are installed on ends of a bridge are formed by introducing the concept of the sacrifice means to a seismic load.
- the shear keys are devices which function to support horizontal force generated in a direction perpendicular to a bridge axis (a bridge extending direction) .
- the shear keys cause a seismic load to be concentrated in the shear keys which are installed on abutments when an earthquake occurs, and thereby prevent abutments and piers from being damaged.
- shear keys are divided depending upon their shapes into internal shear keys which are installed inside the abutments below a super structure and external shear keys which are installed at sides of the super structure.
- the devices for improving girder performance of a bridge by using the ductile bracings installed on the ends of the bridge as sacrifice means are constituted by applying EBFs (eccentrically braced frames) , SPSs (shear panel systems) , or TADASs (triangular plate added damping and stiffness devices) , a kind of ADAS, to the vertical end bracings of steel plate girder bridges.
- EBFs eccentrically braced frames
- SPSs sinar panel systems
- TADASs triangular plate added damping and stiffness devices
- the ductile bracings are designed to be plastically deformed before the sub structure of the bridge reaches a yield point, so that damage due to a seismic load which may be caused in a non-ductile member or a bridge base and bridge seat section can be prevented.
- the conventional girder bridge protection devices do not normally play a specific role with regard to the behavior of a bridge, if an earthquake does not occur throughout the lifetime of the bridge, the conventional girder bridge protection devices cannot perform any function, whereby economic loss is caused.
- Patent Laid-open Publication No. 2004-97591 (dated November
- the sacrifice bracing suggested in the published patent document due to an asymmetrical configuration, it is possible to properly resist vibration which has a level no less than a yield point and basically acts in a direction corresponding to the direction of a bridge axis when an earthquake occurs. Nevertheless, the sacrifice bracing cannot properly resist a seismic shock which acts in the direction perpendicular to the bridge axis.
- the present invention has been made to solve the above problems occurring in the prior art and to protect a bridge from a seismic load and various normally applied external forces.
- an object of the present invention is to advantageously modify the subject matters of Korean Patent
- Laid-open Publication No. 2004-97591 and provide an girder bridge protection device using sacrifice means which includes a symmetrical main support member playing a role of improving the structural behavior of main parts while an earthquake does not occur and of effectively dissipating energy generated by a seismic load when an earthquake occurs.
- an girder bridge protection device comprising sacrifice means including girders which are installed on an upper surface of a bridge seat of an abutment or pier to support a bridge floor, a symmetrical main support member which connects two girders and has a pipe-shaped configuration, and an auxiliary support member which projects from one surface of a center portion of the main support member in a direction perpendicular to an axial direction of the main support member; and restraining means secured to the bridge seat of the abutment or pier and including an accommodating section which accommodates the auxiliary support member such that the auxiliary support member is separated from the accommodating section in a forward and rearward direction and in a leftward and rightward direction, thereby controlling behavior of the auxiliary support member.
- the girder bridge protection device provides advantages in that it is possible to simultaneously expect separation of a super structure of the bridge from a seismic load and energy dissipation by the girder bridge protection device.
- displacement of the super structure in the direction of a bridge axis may cause a problem.
- sacrifice means constituting the girder bridge protection device according to the present invention limits the displacement of the super structure in the direction of the bridge axis to some extent, collision between adjoining vibration systems of the super structure can be prevented.
- FIG. Ia is a front view illustrating a bridge which adopts an I-shaped plate girder using an girder bridge protection device according to the present invention
- FIG. Ib is a partially enlarged partial cross-sectional view illustrating the bridge which adopts the I-shaped plate girder
- FIG. Ic is a partial cross-sectional view illustrating a bridge which adopts a box-shaped girder;
- FIGs. 2a through 2c are a perspective view and plan views illustrating in detail the sacrifice means shown in FIG. Ib;
- FIG. 2d is a cross-sectional view illustrating a variation of FIG. 2a which adopts a leaf spring
- FIG. 3a is a perspective view illustrating in detail the sacrifice means shown in FIG. Ic;
- FIGs. 3b through 3e are perspective views illustrating different shapes of bridge protection devices.
- FIGs. 4a through 4c are a perspective view and plan view illustrating sacrifice means having a bar-shaped auxiliary support member.
- D girder bridge protection device 10,110,210,310,410: sacrifice means
- main support member 13 auxiliary support member 13a: accommodated section 13b: connection sections 20: restraining means 21: accommodating section B: bridge
- a lengthwise direction of a super structure which connects piers positioned at both ends of a bridge B, that is, the direction of a bridge axis, is set as a forward and rearward direction.
- a gravity direction is set as an upward and downward direction.
- the sacrifice means 10 of the girder bridge protection device D includes girders 31 which are installed on the upper surface of the bridge seat 33 of an abutment (not shown) or pier 35 to support a bridge floor 37, a symmetrical main support member 11 which connects two girders 31 and has a pipe-shaped configuration, and an auxiliary support member 13 which projects from one surface of the center portion of the main support member 11 in a direction perpendicular to the axis of the main support member 11.
- sectional area of the auxiliary support member 13 may correspond to 30-95% of the main support member 11, in order to ensure easy prediction of energy dissipation degree and functionality of the sacrifice means, it is preferred that the sectional area of the auxiliary support member 13 approach as closely as possible to that of the main support member 11.
- the sacrifice means according to the present invention can be conveniently manufactured and simply installed since the sacrifice means can be easily coupled at the proper positions to the girders.
- the sacrifice means described in Korean Patent Laid- open Publication No. 2004-97591 because the pair of steel elements behave independently of each other, structural analysis is complicated. However, in the present invention, since it is sufficient to implement structural analysis only for the single main support member, convenience is rendered. Further, the sacrifice means according to the present invention can perform required functions while an earthquake does not occur and when an earthquake occurs, without the need of providing a stress concentrating portion in the form of a notch as disclosed in Korean Patent Laid-open Publication No. 2004-97591.
- the main support member 11 of the sacrifice means is installed to define a configuration which connects the lower ends of two adjoining girders to satisfy a transverse support condition of a structure.
- the main support member 11 serves as a secondary element which functions to help a bridge maintain its sectional shape and secure its sufficient strength and to ensure reliable transmission of a transverse load to the bridge seat.
- the girders of a bridge to which the girder bridge protection device D according to the present invention is applied may comprise the I-shaped plate girders 31 as shown in FIGs. Ia and Ib, the box-shaped girders 131 as shown in
- FIG. Ic and the likes.
- the sacrifice means 10 be manufactured to have strength less than that of the girders 31, and other reinforcing braces 39A or a transverse end beam 39B (see FIG. Ib) .
- the main support member of the sacrifice means may comprise a symmetrical pipe which has a quadrangular sectional shape, in particular, a square sectional shape as shown in FIGs. Ib and 2a, or a circular sectional shape as shown in FIGs. Ic and 3a.
- the main support member may have various sectional shapes, in order to ensure easy coupling of the auxiliary support member to the main support member, it is preferred that the main support member has a quadrangular sectional shape.
- both ends of the main support member 11, through which the main support member 11 is connected to the girders 31, have larger sectional areas than the other portions of the main support member 11.
- separate plates lib and lie are provided on the sides and the lower surface of each end of the main support member 11 and then welded thereto.
- the girder bridge protection devices D shown from FIG. 2a to the end of the drawings are mainly used in a bridge B which adopts the box-shaped girders 131 as shown in FIG. Ic.
- a bridge construction cost can be reduced and construction work can be easily implemented.
- both ends of the main support member 11 are formed with flanges 11a so that the main support member 11 can be easily coupled to the box-shaped girders through welding, riveting, bolting, etc.
- flanges are formed at both ends of each of the main support members of various sacrifice means shown from FIG. 2a to the end of the drawings to ensure easy coupling of the main support member to the girders.
- the flanges are formed to be bolted to the girders.
- connection type of the flanges be determined in consideration of a designed seismic load of a geographical area where the bridge is to be installed so that an amount of load which is supported by the girders can be minimized to prevent damage to the girders.
- vertical reinforcing members can be placed on the side surface of the girders and both ends of the main support member can be simultaneously coupled to the vertical reinforcing members and to the lower flanges of the girders .
- restraining means 20 which constitutes the girder bridge protection device D according to the present invention is secured to the bridge seat 33 of the abutment or pier.
- the restraining means 20 includes an accommodating section 21 which accommodates the auxiliary support member 13 of the sacrifice means 10 and 110 such that the auxiliary support member 13 is separated from the accommodating section 21 by a predetermined distance to control the behavior of the auxiliary support member 13.
- the auxiliary support member 13 projects in one direction which is perpendicular to the axis of the main support members 11 and 111, in particular, in a forward direction.
- the auxiliary support member 13 is coupled to the main support member 11 and 111 in such a way as to define a closed loop.
- the auxiliary support member 13 has a substantially U- like sectional shape.
- the auxiliary support member 13 includes a pair of connection sections 13b which are connected to the main support member 11 and 111 and an accommodated section 13a which connects the pair of connection sections 13b with each other and is positioned in the accommodating section 21 of the restraining means 20.
- the accommodating section 21 of the restraining means 20 has a sectional shape which is the same as or different from that of the auxiliary support member 13 of the sacrifice means 10 and 110.
- the accommodating section 21 of the restraining means 20 have the same sectional shape as the auxiliary support member 13.
- the auxiliary support member 13 and the accommodating section 21 of the restraining means 20 have quadrangular sectional shapes.
- the distance between the accommodating section 21 and the auxiliary support member 13 of the sacrifice means 10 and 110 is determined in consideration of the predicted displacement of the sacrifice means 10 and 110 which is caused by temperature change, sagging, concrete creep, dry contraction, and elastic deformation of the members due to pre-stress, of the super structure of the bridge.
- the sacrifice means 10 and 110 since the sacrifice means 10 and 110 must serve as the secondary reinforcing element while an earthquake does not occur, it is not preferable, in view of the protection of the bridge, for the auxiliary support member or the main support member of the sacrifice means 10 and 110 to be restrained by the restraining means 20 and undergo plastic deformation while a normal load is applied. Therefore, it is effective that a predetermined distance is defined between the accommodating section of the restraining means and the auxiliary support member of the sacrifice means.
- the separation distance be determined not to exceed the displacement of the sacrifice means 10 which is predicted under application of a normal load less than a seismic load.
- the relative displacement of the auxiliary support member 13 of the sacrifice means 110 which is restrained by the accommodating section 21 of the restraining means 20 corresponds to the distance dl between the inner wall of the accommodating section 21 and the outer wall of the accommodated section 13a, through which the auxiliary support member 13 can be moved in the forward and rearward direction.
- the distance dl may vary at every position depending upon the configuration and the sectional area of the accommodating section and the accommodated section, in order to ensure predictability, it is preferred that the distance dl be kept constant at any positions on the accommodating section and the accommodated section.
- the auxiliary support member has a leftward and rightward relative displacement which corresponds to the distance d2 between the left or right end of the accommodating section 21 of the restraining means 20 and the connection section 13b of the auxiliary support member 13.
- the distances dl and d2 are determined through structural analysis and may have various values.
- the upward and downward separation between the auxiliary support member of the sacrifice means and the restraining means is not considered.
- the reason to this is that the requirement for dealing with upward and downward vibration is insignificant when compared to the requirement for dealing with forward and rearward vibration and the leftward and rightward vibration, in the light of girder design characteristics of a bridge.
- necessary measures can be taken to deal with the upward and downward vibration.
- elastic means specifically, a leaf spring S is intervened between the accommodating section 2IA of the restraining means 2OA and the accommodated section 13a of the auxiliary support member 13.
- the leaf spring S prevents the auxiliary support member 13 or the restraining means 20 from being broken by a shock generated due to vibration suddenly applied in the forward and rearward direction, and the girder bridge protection device D according to the present invention from losing its functionality.
- the leaf spring S can be applied to other types of sacrifice means.
- the elastic means may have various shapes.
- the restraining means 20 in order to ensure easy installation of the restraining means 20, it is preferred that the restraining means 20 comprise an upper body 2OA which is formed with the accommodating section 21 for accommodating the auxiliary support member 13 and a lower body 2OB which is secured to the bridge seat 33, the upper body 2OA and the lower body 2OB being assembled with each other. Due to the fact that the auxiliary support member 13 of the sacrifice means 110 is positioned in the accommodation section 21 of the restraining means 20, leftward, rightward, forward and rearward behavior of the sacrifice means is restrained.
- the sacrifice means 110 undergoes bending behavior under the action of the restraining means 20. This means that the sacrifice means 110 goes out of an elastic deformation range and undergoes plastic behavior. Therefore, through repetition of this hysteresis behavior, it is possible to dissipate the energy applied to the bridge by a seismic load.
- the sacrifice means 110 serving as a kind of brace adopts a structure in which the lower ends of two adjoining girders are connected with each other.
- the girder bridge protection device according to the present invention can be applied to any kinds of bridges so long as the bridges are configured in a manner such that the super and sub structures of each bridge are connected by the girders.
- the present invention can be applied to I- shaped plate girder bridges and box-shaped girder bridges.
- the present invention can be applied to all of simple beam bridges, continuous bridges, steel bridges and concrete bridges .
- the sacrifice means not only performs a function of sacrifice means for dissipating a seismic load through hysteresis behavior, but also serves as a secondary reinforcing element to be used under a normal load. While the sacrifice means is required to have strength which is greater than predetermined strength, if the sacrifice means has excessively large strength, the girders connected to both ends of the sacrifice means are likely to be damaged. In this consideration, it is preferred that the sacrifice means be made of a material having strength less than the girders and/or other reinforcing braces. In the girder bridge protection device D according to the present invention, the material and the sectional shape of the sacrifice means must be designed in consideration of the characteristics of a geographical area where the bridge is to be installed.
- the sacrifice means in a medium-sized and slight earthquake region such as Korea, it is preferable to install the sacrifice means so that the function of the sacrifice means as a secondary reinforcing element is emphasized. In the case of a severe earthquake region such as Japan, it is preferable to install the sacrifice means so that the original function of the sacrifice means is emphasized.
- the sacrifice means according to the present invention more particularly, the auxiliary support member which projects in the direction perpendicular to the axis of the main support member, can have a variety of configurations. For example, as can be readily seen from FIGs. 2a, and 3a through 3e, the sacrifice means are divided into a first type in which the main support member and the auxiliary support member are coupled to each other to define a closed loop, and a second type in which the sacrifice means comprises a bar-shaped configuration.
- auxiliary support members are shown as having a quadrangular sectional shape, it is to be readily understood that the auxiliary support member may have a variety of sectional shapes. Also, it is to be noted that the sectional area of the auxiliary support member may vary, and, as the case may be, may be the same as or exceed the sectional area of the main support member.
- the accommodating section of the restraining means has a sectional shape which corresponds to that of the auxiliary support member, it is possible to reliably restrain the behavior of the sacrifice means by the restraining means.
- the restraining means not only can restrain the behavior of the sacrifice means in the direction of a bridge axis (the forward and rearward direction) to cause plastic breakage of the center portion of the main support member serving as a stress concentrating section, but also can simultaneously restrain the behavior of the sacrifice means in the direction perpendicular to the bridge axis (the leftward and rightward direction) to perform a function of a restrainer.
- the auxiliary support member and the main support member can be connected with each other through welding, riveting, bolting, etc.
- the flanges 13c (see FIG. 2a) of the auxiliary support member are bolted to the main support member.
- a plurality of reinforcing ribs 13d is formed between the flange 13c and the connection section 13b.
- the auxiliary support member 13 as shown in FIGs. Ia, Ib and 2a which has the configuration defining the closed loop, projects in the direction perpendicular to the axis of the main support member, particularly, in the forward direction, and has a substantially U-like sectional shape.
- the accommodated section 13a may not be continuous but be snapped at the middle portion thereof.
- the auxiliary support member does not define a closed loop.
- the main support member HlA and the flanges 111b formed at both ends of the main support member HlA have circular sectional shapes.
- the auxiliary support member 113 which projects in the direction perpendicular to the axis of the main support member 111, particularly, in the forward direction, comprises the connection sections 113b and the accommodated section 113a.
- Sacrifice means 210 shown in FIG. 3b comprises a pair of main support members 211A and 211B which are installed on the same bridge seat and respectively connect two pairs of girders separated from each other.
- the auxiliary support member 213 comprises a pair of connection sections 213b each of which connects the main support members with each other and an accommodated section 213a which connects the middle portion of the connection sections 213b with each other.
- the two main support members share the one auxiliary support member. Since the accommodated section 213a of the auxiliary support member 213 has the same shape as the accommodated section 13a shown in FIG. 2a, the same restraining means 20 can be used in this sacrifice means.
- FIG. 3c illustrates a variation of FIG. 3b, in which auxiliary support members for two sacrifice means are accommodated in one restraining means.
- the auxiliary support members 13A and 13B are formed on the facing surfaces of main support members HlA and HlB which respectively connect two pairs of girders separated from each other.
- Two accommodating sections 12IA and 12IB are formed in the restraining means 120 to receive the two auxiliary support members 13A and 13B, respectively.
- sacrifice means 10 has restraining means 220 which is installed on the side surface of the bridge seat 33 of an abutment or pier.
- This restraining means 220 can be used when the girder bridge protection device according to the present invention is installed to repair an already constructed bridge or when an area of the bridge seat is insufficient.
- an auxiliary support member 131 comprises connection sections and an accommodated section which project downward from a main support member 311.
- an auxiliary support member 413 of sacrifice means 410 shown in FIG. 4a comprises a bar-shaped accommodated section 413a which projects in the direction perpendicular to the axis of a main support member 411, particularly, in the forward direction, and a release prevention section 413b which is coupled to an end of the accommodated section 413a, more concretely, in a direction perpendicular to the axis of the accommodated section 413a.
- An accommodating section 321 of restraining means 320 is formed to extend in the forward and rearward direction to accommodate the accommodated section 413a of the auxiliary- support member .413.
- the behavior of the sacrifice means 410 shown in FIG. 4a is restrained by the release prevention section 413b of the auxiliary support member and the restraining means 320.
- the auxiliary support member 413 and the accommodating section 321 of the restraining means 320 be separated by a predetermined distance. Therefore, as shown in FIG.
- the relative displacement between the auxiliary support member 413 of the sacrifice means 410 which is restrained by the accommodating section 321 of the restraining means 320 and the restraining means 320 corresponds to a distance d3 between the inner wall of the accommodating section 321 and the outer wall of the accommodated section 413a, through which the auxiliary support member 13 can be moved in the leftward and rightward direction.
- the distance d3 may also vary at every position depending on the configuration and the sectional area of the accommodating section and the accommodated section, in order to ensure predictability, it is preferred that the distance d3 be kept constant on any position on the accommodating section and the accommodated section.
- the auxiliary support member 413 has a forward and rearward relative displacement which corresponds to the distance d4 between the front or rear end of the accommodating section 321 of the restraining means 320 and the release prevention section 413b of the auxiliary support member 413 or the front wall of the main support member 411 (or the flange of the auxiliary support member 413) .
- the distances d3 and d4 are determined through structural analysis and may have various values.
- the strength, shape and size of the sacrifice means are determined through structural analysis conducted in consideration of the characteristics of a geographical area where the bridge is to be installed. Further, displacement of the sacrifice means due to elastic deformation of the members caused by temperature change, sagging, concrete creep, dry contraction and pre-stress of the super structure of the bridge, and due to a seismic load, is predicted.
- a separation distance between the accommodating section of the restraining means and the auxiliary support member of the sacrifice means is determined to correspond to the displacement of the sacrifice means.
- the restraining means (particularly, the lower body) is secured at a proper position on the bridge seat on which the girders are installed, and then, the restraining means and the auxiliary support member of the sacrifice means are coupled to each other.
- the girder bridge protection device D according to the present invention may be installed only on bridge seats which have movable ends, or on all bridge seats, whether they have movable ends or fixed ends. Further, after the bridge seats are formed so that they have movable ends, the girder bridge protection device D according to the present invention may be installed on all bridge seats.
- the girder bridge protection device D according to the present invention can be installed on bridge seats which have the movable ends, among all bridge seats, and this option is most appropriate when installing the girder bridge protection device D on the existing bridges .
- the girder bridge protection device D according to the present invention can be installed on all bridge seats which have movable ends or fixed ends, and this option is most appropriate when the shear fracture of bridge seats having fixed ends is likely to occur due to excessive inertia force of the super structure of the bridge.
- the girder bridge protection devices installed on the bridge seats having movable ends first yield to a seismic load due to the difference in distance between the super and sub structures of the bridge. Then, as the seismic load increases, the girder bridge protection devices installed on the bridge seats having the fixed ends yield to the seismic load.
- the girder bridge protection devices according to the present invention can prevent brittle fracture through plastic deformation of the sacrifice means, as a result of which it is possible to prevent collapse of the bridge due to abrupt breakage of the bridge seats having the fixed ends.
- the bridge seats can be formed to have movable ends, and then, the girder bridge protection devices D according to the present invention can be installed on all bridge seats.
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2005518827A JP4160599B2 (en) | 2005-06-27 | 2005-07-01 | Seismic protection device for bridges using sacrificial means |
US10/543,147 US7367075B2 (en) | 2005-07-01 | 2005-07-01 | Girder bridge protection device using sacrifice member |
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KR1020050055731A KR100635098B1 (en) | 2005-06-27 | 2005-06-27 | Girder bridge protection device using sacrifice means |
KR10-2005-0055731 | 2005-06-27 |
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WO2007001103A1 true WO2007001103A1 (en) | 2007-01-04 |
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PCT/KR2005/002098 WO2007001103A1 (en) | 2005-06-27 | 2005-07-01 | Girder bridge protection device using sacrifice mems |
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JP (1) | JP4160599B2 (en) |
KR (1) | KR100635098B1 (en) |
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WO (1) | WO2007001103A1 (en) |
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EP0477144A1 (en) * | 1990-08-30 | 1992-03-25 | Marco Carcassi | Dissipative device for safeguarding a structure against a dynamic stress |
JPH0868198A (en) * | 1994-08-26 | 1996-03-12 | Yoneyama Kogyo Kk | Moving type suspended scaffold device |
US5553342A (en) * | 1994-04-29 | 1996-09-10 | Colebrand Limited | Bridge structure including shock transmission units |
KR20010097528A (en) * | 2000-04-24 | 2001-11-08 | 김재관 | Mechanical Seismic Load Transmitting Unit For Multi-Span Continuous Bridges |
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CN1298932C (en) * | 2004-11-23 | 2007-02-07 | 大连理工大学 | Oriented vertical adjustable tuning mass bumper |
-
2005
- 2005-06-27 KR KR1020050055731A patent/KR100635098B1/en not_active IP Right Cessation
- 2005-07-01 WO PCT/KR2005/002098 patent/WO2007001103A1/en active Application Filing
- 2005-07-01 JP JP2005518827A patent/JP4160599B2/en not_active Expired - Fee Related
- 2005-07-01 CN CN200580000042A patent/CN100587164C/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0477144A1 (en) * | 1990-08-30 | 1992-03-25 | Marco Carcassi | Dissipative device for safeguarding a structure against a dynamic stress |
US5553342A (en) * | 1994-04-29 | 1996-09-10 | Colebrand Limited | Bridge structure including shock transmission units |
JPH0868198A (en) * | 1994-08-26 | 1996-03-12 | Yoneyama Kogyo Kk | Moving type suspended scaffold device |
KR20010097528A (en) * | 2000-04-24 | 2001-11-08 | 김재관 | Mechanical Seismic Load Transmitting Unit For Multi-Span Continuous Bridges |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN103993656A (en) * | 2014-04-11 | 2014-08-20 | 北京工业大学 | Industrialized assembled type multi-level and high-level steel structure frame single-plate self-resetting prestressed anti-buckling eccentric supporting system |
CN104988844A (en) * | 2015-05-19 | 2015-10-21 | 河南省交通规划勘察设计院有限责任公司 | Secondary tensioning prestressed assembly-type corrugated steel web composite beam and construction method thereof |
CN105507132A (en) * | 2015-12-02 | 2016-04-20 | 同济大学 | Torsional three-tube buckling restrained brace |
Also Published As
Publication number | Publication date |
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JP4160599B2 (en) | 2008-10-01 |
CN100587164C (en) | 2010-02-03 |
KR100635098B1 (en) | 2006-10-17 |
CN101124365A (en) | 2008-02-13 |
JP2008511769A (en) | 2008-04-17 |
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