KR100635098B1 - Girder bridge protection device using sacrifice means - Google Patents

Abstract

A bridge protection system for preventing vibration by using a sacrificial member is provided to prevent collision of an upper structure by restricting vertical displacement of the upper structure with the sacrificial member, and to restrict damage of a bridge by controlling the horizontal movement. A bridge protection system(D) for preventing vibration includes a sacrificial member(10) having a main support member(11) connecting girders(31) installed in an upper part of a pier or a bridge bearing and an auxiliary support member(13) protruded perpendicularly to an axis of the main support member near a center of the main support member, and a restricting unit(20) fixed in the pier or the bridge bearing of the pier and provided with a storage part controlling vertical or horizontal movement of the auxiliary support member. The closed loop is formed by assembling the auxiliary support member with the main support member.

Description

Bridge seismic protection device using sacrificial means {GIRDER BRIDGE PROTECTION DEVICE USING SACRIFICE MEANS}

1A is a front view of a bridge employing an I-type plate girder using the bridge seismic protection device according to the present invention,

1B is a partial sectional view of a bridge employing an I-type plate girder,

1C is a partial sectional view of a bridge employing a box girder;

Figures 2a to 2c is a more detailed perspective view and plan view of the sacrificial means shown in Figure 1b,

FIG. 2D is a cross-sectional view showing a modification of FIG. 2A employing a leaf spring; FIG.

Figure 3a is a more detailed perspective view of the sacrificial means shown in Figure 1c,

3b to 3e are perspective views associated with different types of protection devices,

4A to 4C are a perspective view and a plan view of the sacrificial means having an auxiliary support member in the form of a rod.

<Description of the symbols for the main parts of the drawings>

D: bridge seismic protector

10,110,210,310,410: sacrifice

11: Main support member 13: Auxiliary support member

13a: receiving portion 13b: connecting portion

20: restraint means 21: receiving portion

23: coupling portion B: bridge

31,131: Girder 33: Church

35: pier 37: bottom plate

The present invention relates to an apparatus for protecting a bridge,

More specifically, it acts not only as a supporting means for the loads generally acting on the bridge, but also as energy dissipation by the plastic behavior of sacrificing the symmetric supporting members in the event of an earthquake load. The present invention relates to a seismic protection device for bridges using sacrificial means to protect the main part more safely.

In the present specification, the sacrificial means has a concept of a passive energy dissipation device, and plays a predetermined structural role as a secondary member during non-earthquake, but passively dissipates energy generated in a structure during an earthquake load to improve seismic performance. A member that plays a role of making.

Conventional technologies related to passive energy dissipation devices or seismic protection devices for bridges include Korean Utility Model Registration No. 0217048 (2001.01.05), `` Departure Prevention Device of Superstructures in Continuous Bridge Steel Box Bridges '' and Utility Model Registration No. 0335443 ( 2003.11.28) There is a bridge support device.

Passive energy dissipation devices have been applied to various structures in the past, and representative devices developed so far include metallic yield dampers, friction dampers, viscoelastic dampers, viscous fluid dampers, tuned mass dampers, and tuned liquid dampers. (soong et al., 2002)

The metallic yield dampers dissipate energy generated in the structure by the earthquake load through the nonlinear behavior of the metal. Commonly used devices include added damping and stiffness (ADAS), which uses X- or triangular steel sheets to evenly distribute plastic deformation throughout the member. Other types of devices include honeycomb or shear panels, mainly used in Japan, or devices using lead or shape memory alloys in addition to steels (Aiken et al., 1992).

Recently, unbonded braces (tension / compression yielding braces) have been used in the US and Japan as another type of metallic yield dampers. Unbonded braces consist of steel-filled sections that dissipate energy by axial forces and concrete-filled tubes that resist buckling by compressive forces (Wada, 1999; Clark, 1999; Kalyanaraman et al., 1998).

Friction dampers are devices that dissipate energy generated in a structure by seismic load by using friction force generated between two objects, and dissipate energy through friction force generated in the device by compressive and tensile forces.

Hysteresis of Friction damper appears to be a square shape according to the characteristics of Coulomb friction, and through this hysteresis model, it is possible to analyze the behavior of structures due to earthquake loads (Pall et al., 1982; Gringorian et al. , 1993; Pall et al., 1993)

The Viscoelastic damper is a method of dissipating energy generated in a structure mainly through shear deformation of a copolymer or glass material (Chang et al., 1994; Shen et al., 1995; Lai et al., 1995).

The Viscous fluid device is largely divided into a viscous wall and a VF damper. Viscous wall is a device that dissipates energy as the plate moves between steel plates filled with viscous liquid. It has been used for military and aviation, and has been applied to civil engineering recently.

The VF damper consists of a piston with an orifice moving in a cylinder filled with a highly viscous material such as silicone or oil (Constantinou et al., 1993). It serves to dissipate. These VF dampers are often used with base isolation.

In addition, the tuned mass damper and the tuned liquid damper can increase the response in other modes by using a specific mass or liquid to reduce the magnitude of the response to the response of a specific mode, so that the active control system rather than the passive control system can be increased. It is applied to one of the active mass dampers.

The above-mentioned seismic performance enhancing devices are limited in bridge structures, except for VF dampers used with seismic separation bearings, and have been mainly developed and used for building structures (Zahrai et al., 1999).

On the other hand, as described above, the study on the sacrificial means that plays a predetermined structural role as a secondary member during the non-earthquake, and serves to improve the seismic performance by passive dissipation of energy generated in the structure under the earthquake load. It is actively underway.

For example, a shear key and a flexible bracing installed at the end of a bridge can be regarded as a structure in which the concept of a sacrifice means against earthquake load is introduced.

The shear key is a device that serves to support the lateral force generated in the right angle direction of the bridge in the alternating of small and medium bridges, the damage of the shift and the pile by causing the earthquake load to concentrate on the shear key installed on the alternating earthquake A study on the seismic response, analysis and design of shear keys was conducted through the Structural Systems Research Project (SSRP) (Megally et al., 2001).

The shear key is divided into an internal shear key installed inside the shift under the upper structure and an external shear key installed on the side of the upper structure, depending on the shape.

The internal shear key has the advantage of being able to resist both seismic behavior in the axial direction and the axial direction of the axial axis, but has the disadvantage that it is not easy to access after installation.

In the case of an external shear key, there is a problem in that it is easy to access but cannot resist seismic behavior in the axial direction.

The seismic performance enhancing device for bridges using the flexible bracing at the end as a sacrifice means the triangular plate added damping and TADAS, which is a kind of eccentrically braced frames (ESBF), shear panel systems (SPS) or ADAS devices for the end vertical bracing of rigid composite bridges. stiffness devices), which dissipates the energy generated by seismic loads perpendicular to the bridge in the bridge substructure.

Such flexible bracing is designed to cause plastic deformation before the bridge's substructure reaches yield point, thereby preventing damage due to seismic loads that may occur at non-combustible members or foundations and bridges.

However, it has been pointed out as a problem in that such a device is applied under the assumption that deformation or load occurring in the axial direction is limited to a specific method, and there is no dissipation capacity for energy and displacement generated in the axial direction due to the earthquake load. (Zahrai et al., 1999; Bruneau et al., 2002)

Conventional bridge seismic protection device as described above had the following problems.

First, it is difficult to apply to existing bridges and new bridges, and there is a burden of traffic control for construction, and a high cost of using specially manufactured expensive equipment.

Second, since the earthquake usually does not play a specific role in the behavior of the bridge, if the earthquake does not occur during the bridge's life, it does not play any role, so bear the relative economic losses.

Third, it cannot resist earthquake loads in all directions, such as axial direction and perpendicular to axial direction.

Fourth, it is difficult to accurately predict the elasticity and plastic behavior of the sacrificial means, it is difficult to ensure structural safety.

Fifth, separate maintenance is difficult, and replacement of the victim means is not easy.

Korean Patent Laid-Open Publication No. 2004-0097591 (2004.11.18) filed by the inventor of the present invention to solve this problem, `` bridge seismic protection device and the sacrificial member, sacrificial member restraining means, and Bridge reinforcement method used.

The sacrificial member described in the published patent prevents the impact during an earthquake from reaching other main parts of the bridge through a central stress concentration section in which a notch is introduced to reduce the cross-sectional area.

However, due to the asymmetrical shape, the sacrificial member proposed in the above-described patent can effectively cope with vibrations beyond the yield point acting in the direction basically coinciding with the throttling direction. However, the sacrificial member is not effective against the seismic impact acting in the direction perpendicular to the axial direction.

The present invention has been proposed to solve the above problems to safely protect the bridge from the earthquake load and various external forces in ordinary times.

In particular, the present invention further improves the Patent Publication No. 2004-0097591 to serve to improve the structural behavior of the main member during the non-earthquake, and in the case of an earthquake, a symmetrical column that can effectively dissipate energy due to the earthquake load ( It is an object of the present invention to provide a bridge seismic protective device having a sacrificial member including a support member.

The present invention is a bridge seismic protection device according to the present invention in order to achieve the object as described above is installed on the upper surface of the bridge portion of the alternating or piers to connect the straight distance between the girder and the girder supporting the bottom plate and the pipe form Sacrificial means including a symmetrical main support member having a secondary support member protruding in a direction perpendicular to an axial direction of the support member near the center of the support member; And an accommodating part controlling the behavior by accommodating the auxiliary supporting member of the sacrificial means spaced apart in the front, rear, left and right directions, and including a restraining means fixed to the alternating portion or the pier.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In each of the drawings, the same reference numerals, in particular, the tens and ones digits, or the tens, ones and digits, refer to the same functional members, and unless otherwise specified, refer to each reference. What is necessary is just to consider a member as a member based on these standards.

In addition, in the description of the seismic protection device for a bridge according to the present invention, if the direction reference is specified with reference to FIGS. 1A and 1B, the direction of the upper structure connecting the bridge piers at both ends of the bridge B, that is, the direction corresponding to the bridge axis direction Of the bridge seismic protection device (D) sacrificial means (10) of the present invention for connecting the I-shaped plate girders (31) or the box-shaped girders (131) (see FIG. 1C) to support the bottom plate 37. The left and right are divided with respect to the longitudinal direction of the main support member 11, and the upper and lower sides are divided based on the gravity direction.

1A and 1B, the sacrificial means 10 of the bridge seismic protection device D according to the present invention is installed on an upper surface of an alternating portion (not shown) or a bridge portion 33 of the bridge 35. 37 a shaft of the supporting member in the vicinity of the center of the symmetrical main supporting member 11 and the supporting member 11 having a pipe shape by connecting a straight distance between the girder 31 and the girder supporting 37). It includes an auxiliary support member 13 protruding in any one direction in a form perpendicular to the direction.

The cross-sectional area of the auxiliary supporting member may be 30 to 95% of the cross-sectional area of the supporting member, preferably the same as the cross-sectional area of the supporting member possible for the degree of energy dissipation and ease of function prediction as a sacrifice means.

The sacrificial means according to the present invention is more convenient to manufacture than the Patent Publication No. 2004-0097591 related to the sacrificial means consisting of two section steel having a '┗' type, and it is easier to install the sacrificial means in the right position of the girder. easy.

In addition, the present invention is more convenient because the two beams of the sacrificial means of Patent Publication No. 2004-0097591 behave independently of each other because the structural analysis is more complicated than the complicated structural analysis.

The present invention can still play a necessary role in the case of non-earthquake and earthquake sufficiently without the notch-shaped stress concentration part of the sacrificial means of Patent Publication No. 2004-0097591.

In the present invention, the supporting member 11 of the sacrificial means is installed in a structure that connects the lower end of the girder and the adjacent girder so as to satisfy the lateral support conditions of the structure, and usually acts as a secondary member to maintain the bridge cross-sectional shape, It also plays a role in ensuring rigidity and smooth transfer of lateral loads to the seat.

The girder of the bridge to which the bridge seismic protection device D according to the present invention can be applied is an I type girder 31 as shown in FIGS. 1A and 1B or a box girder 131 as shown in FIG. 1C, or other various girders. Can be.

The sacrificial means 10 is preferably made of a weaker rigidity than the housing (31) or other reinforcing brace (39A) or end crossbeam (39B) (see Figure 1a).

In addition, the supporting member of the sacrificial means may be made of a symmetrical pipe whose cross section is rectangular, in particular quadrangular 10 or circular 110, as in FIGS. 1b and 2a or 1c and 3a.

The cross-sectional shape of the supporting member may be modified in various forms, but it is preferable to have a rectangular cross section in consideration of productivity, installation convenience, and ease of joining of the auxiliary supporting member.

In FIG. 1B, the sacrificial means 10 of the bridge seismic protection device D installed in the I-type plate girder 31 connects the supporting member 11 to the girder 31 so that both ends of the supporting member ( The cross-sectional area of 11a) may be enlarged compared to other parts, and in the connection with the girder 31, separate plates 11b and 11c may be introduced to the side and the lower part to fix and bond by welding. .

The bridge seismic protection device D shown in the drawings below in FIG. 2A is mainly used for the bridge B employing the box-type girder 131 as shown in FIG. 1C. Even in the box-girder bridge, the size of the end crossbeam 39B is smaller than the crossbeam of the conventional bridge due to the protection device according to the present invention, so that the bridge construction cost can be reduced and the convenience of construction work can be increased.

In FIG. 2A, flanges 111a are formed at both ends of the supporting member 111 so that welding with a box-type girder, a rivet, a bolt, or the like can be easily performed. The introduction of the flange for engagement with the girder is the same for the supporting member of the sacrificial means shown in the figure below in FIG. 2B. In the figure the flange is shown in the form for bolting.

In connection with the flange 11a as a connecting means for the girder and the sacrificial means 10, in particular, the supporting member, in consideration of the design earthquake force in the area where the bridge is installed, It is preferable that the connection form has a structure that prevents damage.

That is, in the case of the weakly weakened area, the deformation amount of the supporting member of the sacrificial means will not be large, and in general, various additional reinforcing members may be further introduced to the side of the bridge girder.

However, in the case of the strong earth area, since the deformation amount of the sacrificial means will be large, the vertical reinforcement coupled to the side of the girder may be installed, and the end of the supporting member may be coupled to the vertical reinforcement and the lower flange of the girder itself.

As a result, it is preferable that only sacrificial means made of a material having a weaker rigidity than the girder during the earthquake load cause plastic deformation and only the deformation in the elastic region occurs in the girder.

In addition, the restraining means 20 constituting the bridge seismic protection device (D) of the present invention in Figures 1a, 1b, and 2a is spaced apart from the auxiliary support member 13 of the sacrificial means (10) (110) by a predetermined interval. It is accommodated so as to include a receiving portion 21 for controlling the behavior, it is fixed to the bridge portion 33 of the alternating or pier.

The auxiliary supporting member 13 protrudes in one direction, in particular in the form of a right angle with respect to the axial direction of the supporting members 11 and 111. In addition, the auxiliary supporting member 13 has a closed loop shape in a state in which the auxiliary supporting member 13 is coupled to the supporting members 11 and 111.

In addition, the auxiliary support member 13 has a cross-section in the shape of "┗┛", and the two connecting portions 13b and the two connecting portions connected to the supporting members 11 and 111 and the constraining means 20 Consists of a receiving portion (13a) located in the receiving portion 21 of the.

The receiving portion 21 of the restraining means 20 may have a cross-sectional shape corresponding to the shape of the auxiliary supporting member 13 of the sacrificial means 10 and 110 or may have a different shape.

However, in order to more reliably restrain the behavior of the sacrificial means 10 and 110 by the restraining means 20 during the earthquake load, the receiving portion 21 of the restraining means 20 corresponds to the cross section of the auxiliary supporting member. It is good to take a structure formed to have a cross section. In the figure, the cross-sectional shape of the receiving portion 21 of the auxiliary supporting member 13 and the restraining means 20 is rectangular.

Here, the interval between the receiving portion 21 and the auxiliary support member 13 of the sacrificial means 10, 110 is the elasticity of the member according to the temperature change, deflection, creep of the concrete, dry shrinkage, prestress of the bridge superstructure It is determined in consideration of the expected displacement of the sacrificial means (10) (110) due to deformation.

That is, the sacrificial means (10) (110) under the situation that the earthquake load does not occur because the secondary reinforcing member is to act as a secondary support member or a known member of the sacrificial means (10) 110 when a general load is applied. It is rather undesirable for the protection of the bridge to be constrained by the restraining means 20 to cause plastic deformation. Therefore, it is effective that the interval between the receiving portion of the restraining means and the sacrificial means auxiliary supporting member is spaced a predetermined distance.

However, if the separation distance is excessive, since the sacrificial means 10 and 110 may not cause plastic deformation by the restraining means 20 even in the event of an earthquake load, the separation distance may be caused by a general load less than the earthquake load. It is desirable not to exceed the amount corresponding to the expected displacement of the sacrificial means 10 that may occur.

In FIG. 2B, the relative displacement of the auxiliary supporting member 13 of the sacrificial means 110 and the restraining means 20 constrained by the receiving portion 21 of the restraining means 20 is determined by the receiving portion 21. The inner wall and the outer wall distance d1 of the to-be-accepted portion 13a may move in the front-rear direction.

The distance d1 may have a different value for each position of the accommodating part and the accommodating part depending on the shape and the cross-sectional area of the accommodating part and the accommodating part, but it may be preferable to have the same distance at any position for predictability.

In addition, at 2c, the left and right end portions of the receiving portion 21 of the restraining means 20 and the gap d2 between the connecting portion 13b of the auxiliary support member 13 are provided.

The intervals d1 and d2 are determined by structural analysis and may have various values.

In the above, the vertical separation between the auxiliary supporting member of the sacrificial means and the restraining means is not taken into consideration, because in the seismic design characteristics of the bridge, the necessity to cope with the up and down oscillation is insignificant compared to the necessity to cope with the front, rear, left and right oscillation. Can take measures to cope with mutual vibrations.

Meanwhile, in FIG. 2D, an elastic means, in particular a leaf spring S, is interposed between the receiving portion 21A of the restraining means 20A and the to-be-accepted portion 13a of the auxiliary supporting member 13 to act in the front-rear direction. The auxiliary support member 13 or the restraining means 20A is damaged by the shock caused by the sudden vibration, thereby preventing the accident that the function of the bridge seismic protection device according to the present invention is destroyed. This leaf spring (S) can be applied to other forms of sacrificial means.

The shape of the elastic means can be variously modified.

In FIG. 2A, the restraining means 20 is provided with an upper body 20A having an accommodating portion 21 for accommodating the auxiliary supporting member 13 and a lower body 20B installed on the seat 33. It is preferable that this is made by assembling, and the same applies to the restraining means shown in other drawings.

In addition, since the auxiliary supporting member 113 of the sacrificial means 110 is located in the receiving portion 21 of the restraining means 20, the left and right and front and rear directions of the sacrificial means are restrained.

Therefore, when a large external force to the seismic load is applied to increase the relative behavior of the bridge upper structure and the lower structure, the sacrificial means 110 causes the bending behavior by the restraint of the restraining means 20, which is the sacrificial means 110 ) Means plastic behavior out of the elastic region, and the energy introduced into the bridge by the seismic load is dissipated by the repeated hysteresis behavior.

Bridge seismic protection device according to the present invention has a structure that connects the lower end of the girder and the adjacent girder, the sacrificial means 110, which is a kind of brace, if any bridge of the structure connecting the upper structure and the lower structure by the girder It is also applicable to bridges. Therefore, it can be applied to I type girder bridge or box girder bridge, and can be applied to simple bridge, continuous bridge, steel bridge, and concrete bridge as long as it takes the structure of girder bridge.

In the present invention, the sacrificial means not only serves as a sacrificial means for dissipating the load by hysteresis behavior under an earthquake load, but also simultaneously serves as a secondary reinforcing member under normal working load. Therefore, it is required to have a certain degree of strength, but if excessive stiffness may damage the girder connected to both sides of the sacrificial means, it is made of a material that is weaker than the girder and / or other reinforcing braces. It is preferable.

The material or the cross-sectional shape of the sacrificial means of the seismic protection device for the bridge according to the present invention should be designed according to the geological characteristics of the area where the actual bridge is installed.

For example, it is preferable to install the reinforcing member to emphasize the role of the secondary reinforcing member, such as the Republic of Korea, and in the case of a strong earthquake region such as Japan, it is preferable to install the original role of the means of sacrifice.

The sacrificial means according to the present invention, more specifically, the auxiliary support member protruding in any one direction to form a right angle with respect to the axial direction of the supporting member can be modified in various forms.

For example, as shown in FIGS. 2A and 3A to 3E, the state in which the supporting member and the auxiliary supporting member are coupled forms a closed loop shape, and a rod shape as illustrated in FIG. 4A. Can be roughly divided into

Although the cross-sectional shape of the auxiliary support member is made of a pipe having a rectangular shape in each drawing, it may be modified to have various cross sections. In addition, the cross-sectional area of the auxiliary support member may also be variously designed, in some cases the same as or exceeds the cross-sectional area of the supporting member.

In addition, the receiving portion of the restraining means has a cross section corresponding to the end face of the auxiliary supporting member, whereby the restraining means can restrain the behavior of the sacrificial means more reliably.

Through this, the restraining means restrains the axial direction of the sacrificial means (back and forth) to induce plastic fracture of the central part of the supporting member, which is the stress concentration part, and also restrains the axial orthogonal (left and right) behavior of the sacrificial means. Therefore, the role of the listtrainer will also be performed.

The auxiliary supporting member and the supporting member may be connected by welding, rivets, bolts, and the like. In the drawing, the auxiliary supporting member is illustrated by a bolt coupling method through a flange 13c (see FIG. 2A) of the auxiliary supporting member. A plurality of reinforcing teeth 13d are provided on the contact surface of the 13c and the connecting portion 13b.

First, as an auxiliary support member in the form of a closed loop, the auxiliary support member 13 shown in FIGS. 1A, 1B, and 2A is formed in a right angle with respect to the axial direction of the supporting member, as described above. It protrudes forward and has a cross section of “┗┛” shape.

In the auxiliary supporting member having a closed loop shape, the receiver 13a may not be connected but may be deformed in a form in which the middle part is broken, but of course, this is not a closed loop shape.

Next, as described above, the sacrificial means 110A shown in FIGS. 1C and 3A has a circular cross section and both ends of the flange 111b of the supporting member 111A, and the auxiliary supporting member 113 is also the supporting member. It has a connection part 113b and the to-be-received part 113a which protruded at right angles, especially front of 111.

Next, the sacrificial means 210 shown in FIG. 3B has two supporting members 211A and 211B installed at one intersection and connecting two pairs of girders, each of which is spaced apart from each other.

In particular, the opposing surface of the two supporting members is provided with an auxiliary supporting member 213 consisting of two connecting portions 213b for interconnecting the two supporting members and an accommodating portion 213a for connecting the middle portions of the two connecting portions. . This is a form in which two supporting members share one auxiliary supporting member.

Since the receiving portion 213a of the auxiliary supporting member 213 has the same shape as that of the receiving portion 13a of FIG. 2A, the same restraining means 20 may be used.

Next, FIG. 3C is a modification related to FIG. 3B, in which auxiliary supporting members for two sacrificial means are accommodated by one restraining means.

The sacrificial means 110 shown is provided on one opposing side and the auxiliary supporting member 13A (13A) on opposite surfaces of two supporting members 111A and 111B respectively connecting two pairs of girders whose ends are spaced from each other. 13B) is formed. Two receiving portions 121A and 121B are formed in the restraining means 120 for each of the two auxiliary supporting members 13A and 13B.

In addition, in the bridge seismic protection device (D) shown in FIG. 3D, the sacrificial means 10 has a restraining means 220 provided on the upper side of the alternating portion 33. Such restraining means 220 is a method that can be used when the area of the bridge is insufficient when installing the bridge seismic protection device according to the present invention for the renovation of the already built bridge.

In the sacrificial means 310 shown in Figure 3e the auxiliary support member 313 is composed of a connecting portion and the receiving portion protruding to the lower portion of the supporting member 311.

Next, the auxiliary supporting member 413 of the sacrificial means 410 shown in FIG. 4A as related to the auxiliary supporting member in the form of a rod is formed in a right angle with respect to the axial direction of the supporting member 411 in any one direction, in particular. It consists of a rod-shaped to-be-received portion 413a protruding forward and an end portion of the to-be-received portion 413a, more specifically, a separation prevention portion 413b coupled in a direction perpendicular to the axial direction of the to-be-received portion. .

The receiving portion 321 of the restraining means 320 is formed in the front-rear direction for the receiving portion 413a of the auxiliary supporting member 413.

The restriction of the behavior of the sacrificial member 410 illustrated in FIG. 4A is achieved by the separation preventing part 413b and the restraining means 320 of the auxiliary supporting member.

As described above with reference to FIGS. 2A to 2C, in order to cope with plastic deformation of the bridge illustrated in FIG. 4A, the auxiliary supporting member 413 and the receiving portion 321 of the restraining means 320 are spaced at a predetermined interval. It is preferable that it is done.

Therefore, as shown in FIG. 4B, the relative displacement of the auxiliary support member 413 of the sacrificial means 410 and the restraining means 320 constrained by the receiving portion 321 of the restraining means 320 is determined by the receiving portion. The inner wall 321 and the outer wall distance d3 of the to-be-accepted portion 413a may move left and right.

The distance d3 may also have different values depending on the shape and the cross-sectional area of the accommodating part and the receiving part, depending on the positions of the accommodating part and the accommodating part.

In addition, the front and rear ends of the receiving portion 231 of the restraining means 320 and the release preventing portion 413b and the supporting member 411 of the supporting member 413 in 4c (or auxiliary supporting member 413). Has a forward and backward displacement as much as the distance d4 between the flanges.

The intervals d3 and d4 are determined by structural analysis and may have various values.

Bridge seismic protection device according to the present invention determines the strength, form, dimensions, etc. of the sacrificial means by the structural analysis in consideration of the characteristics of the area in which the bridge is installed at the time of installation, temperature change, deflection, creep of concrete The displacement of the sacrificial means due to the elastic deformation and the seismic load of the member due to dry shrinkage, prestress, and the like should be estimated.

In addition, the separation distance between the receiving portion of the restraining means for the sacrificial means and the auxiliary supporting member of the sacrificial means is determined by an amount corresponding to the displacement of the sacrificial means, and the restraining means ( In particular, the lower body) is fixed, and the restraining means and the auxiliary supporting member of the sacrificial member are mutually coupled.

Bridge seismic protection device (D) according to the present invention may be installed only in the bridge portion corresponding to the movable end of the bridge portion, the bridge portion corresponding to the movable portion and the fixed end of the bridge portion) All of them may be installed, and all of the above-described seats may be formed as seats corresponding to movable ends, and all of the seats may be provided.

More specifically, the bridge seismic protection device may be installed only in the bridge corresponding to the movable end of the bridge, which is the most suitable method when the bridge seismic protection device is applied to the existing bridge.

In addition, if the bridge seismic protection device is installed on both the moving part bridge and the fixed end bridge, it is suitable when there is a risk of shear failure due to the excessive inertia of the bridge superstructure. can do.

In the event of an earthquake, the bridge seismic protection device of the bridge of the moving end surrenders due to the difference in the relative distance between the bridge superstructure and the undercarriage, and then the bridge of the fixed end also yields as the load increases. The bridge seismic protection device according to the invention prevents brittle fracture of the bridge by plastic deformation of the sacrificial means, and as a result, it is possible to prevent falling of the bridge due to sudden destruction of the bridge portion of the fixed end.

Finally, both bridge portions of the bridge may be provided as bridge portions of the movable end, and the bridge seismic protection device may be installed on both bridges of the movable edge.

Bridge seismic protection device of the present invention described above has the advantage that both the seismic separation effect of the upper structure of the bridge and the energy dissipation effect by the bridge seismic protection device can be expected.

In addition, in the bridge of the movable end structure, the axial displacement of the upper structure may be a problem. The bridge earthquake protection device according to the present invention may allow the sacrificial means to restrain the axial displacement of the upper structure by a certain amount. It also plays a role in preventing collisions.

In addition, in the conventional general bridges, the inertia force generated in the perpendicular direction of the bridge due to the earthquake load is concentrated on a specific bearing which is constrained in the perpendicular direction of the bridge, so that damage and breakage of the specific bearing may be a problem. The seismic protection device controls the behavior of the bridge axial direction only by the bridge seismic protection device without restraining a specific support in the direction perpendicular to the bridge axial direction (left and right directions), thereby preventing damage to the bridge.

In the above description of the present invention with reference to the accompanying drawings, the bridge earthquake protection device using a sacrificial means having a specific shape and structure, but the present invention can be variously modified and changed by those skilled in the art, such variations and modifications It should be interpreted as falling within the protection scope of the present invention.

Claims (10)

A symmetrical main support member having a pipe shape and connected to a straight line between the girder supporting the bottom plate and the girder installed on the upper surface of the alternating part of the bridge or the piers and the supporting member near the center of the supporting member; Sacrificial means comprising an auxiliary support member protruding in one direction in a form perpendicular to the axial direction of the; And A seismic protection device using the sacrificial means comprising a receiving portion for controlling the behavior by receiving the auxiliary support member of the sacrificial means spaced apart in the front and rear and left and right directions, and fixed to the alternating portion of the bridge or piers. The method of claim 1, The auxiliary support member of the sacrificial means is a bridge seismic protection device using the sacrificial means characterized in that the state coupled to the supporting member forms a closed loop shape. The method of claim 2, The auxiliary supporting member has two connecting portions connected to the supporting member; Bridge seismic protection device using the sacrificial means characterized in that the connecting portion and the receiving portion located in the receiving portion of the restraining means. The method of claim 3, wherein The restraining means is a bridge seismic protection device using a sacrificial means characterized in that it has a receiving portion for both the auxiliary support member of the front and rear two supporting members installed in one bridge. The method of claim 4, wherein And the two supporting members share one auxiliary supporting member. The method of claim 1, The auxiliary support member of the sacrificial means is a bridge seismic protection device using the sacrificial means characterized in that the state coupled to the supporting member to form a rod. The method of claim 6, wherein the auxiliary support member A rod-shaped receiving portion located in the receiving portion of the restraining means of the supporting member; Bridge seismic protection device using the sacrificial means, characterized in that the separation support formed in the end of the receiving portion to prevent the mutual support member and the restraining means coupled to each other. The method according to any one of claims 1 to 7, A bridge seismic protection device using the sacrificial means, characterized in that the cross section of the supporting member of the sacrificial means is square. The method according to any one of claims 1 to 7, Bridge seismic protection device using the sacrificial means, characterized in that the elastic means is interposed between the auxiliary support member of the sacrificial means and the receiving portion of the restraining means. The method of claim 9, Bridge seismic protection device using the sacrificial means, characterized in that the elastic means is a leaf spring.

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