阅读说明：本技术 悬索桥铰接式耗能型阻尼扣结构 (Suspension bridge hinged energy-consuming damping buckle structure ) 是由 刘新华 李秋 陈楚龙 黄古剑 彭元诚 吴成亮 钟奇亨 于 2020-06-05 设计创作，主要内容包括：本发明公开了悬索桥铰接式耗能型阻尼扣结构,悬索桥主梁-主缆连接阻尼扣结构,所述阻尼扣采用C型钢片作为阻尼耗能元件,通过设计计算C型钢片的一、二次刚度,最大承载力,阻尼耗能的位移-力的曲线等技术参数,确定其C型钢的尺寸满足悬索桥对中央阻尼扣的需求。所述阻尼扣两端采用铰接的方式分别与悬索桥的主梁与主缆连接,释放可能因为弯矩产生的内应力。所述阻尼扣内部设置有长度调节结构,主要解决因为桥梁施工误引起的主梁与主缆上的连接孔间距误差,从而导致阻尼扣安装困难或者阻尼扣受力不均而影响其性能。所述阻尼扣与水平面夹角在25°～35°之间,有利于主梁-主缆之间力的传递及阻尼扣自身结构的优化。(The invention discloses a suspension bridge hinged energy-consumption type damping buckle structure, which is characterized in that a suspension bridge main beam-main cable is connected with a damping buckle structure, a C-shaped steel sheet is adopted as a damping energy-consumption element for the damping buckle, and the size of the C-shaped steel is determined to meet the requirement of a suspension bridge on a central damping buckle by designing and calculating the technical parameters of the C-shaped steel sheet, such as the primary and secondary rigidity, the maximum bearing capacity, the displacement-force curve of damping energy consumption and the like. The two ends of the damping buckle are respectively connected with a main beam and a main cable of the suspension bridge in a hinged mode, and internal stress possibly generated by bending moment is released. The damping is detained inside and is provided with length adjustment structure, mainly solves because the girder that the bridge construction mistake arouses and the connecting hole interval error on the main push-towing rope to lead to damping to detain the installation difficulty or damping to detain the atress inequality and influence its performance. The included angle between the damping buckle and the horizontal plane is 25-35 degrees, which is beneficial to the transmission of force between the main beam and the main cable and the optimization of the structure of the damping buckle.)

1. A suspension bridge hinged energy-consumption type damping buckle structure comprises a main beam and a main cable, wherein a plurality of pairs of central buckles are arranged along the bridge direction in the middle of the main span of the main beam, each pair of central buckles is composed of two energy-consumption rod pieces arranged in a splayed shape, and the suspension bridge hinged energy-consumption type damping buckle structure is characterized in that each energy-consumption rod piece comprises a tensioning mechanism, an arched damping connecting piece and a connecting piece which are sequentially connected, the tensioning mechanism is composed of a thread sleeve and a lead screw, the thread sleeve is provided with a thread hole in threaded fit with the lead screw, so that the lead screw can stretch and retract along the thread hole, the arched damping connecting piece is composed of an arched plate, and two ends of the arched plate are respectively hinged with the thread;

the tensioning mechanism is characterized in that one end, far away from the arched plate, of the tensioning mechanism is hinged to the main beam through a hinge revolute pair, one end, far away from the arched plate, of the connecting piece is hinged to a cable clamp fixedly mounted on the main cable through the hinge revolute pair, the hinge revolute pair comprises a single lug plate and a double lug plate which are arranged at two ends of the main beam, the cable clamp and the energy consumption rod piece and are matched with each other, and the single lug plate and the double lug plate which are matched with each other form a joint bearing and a main pin which are connected in.

2. The structure of claim 1, wherein the tensioning mechanism comprises a pair of thread sleeves and a screw rod, the pair of thread sleeves are sleeved on two ends of the screw rod and can rotate and displace along the screw rod, and the thread sleeves far away from the arched plate are integrally connected with the single lug plate or the double lug plates.

3. The suspension bridge hinged energy-consumption type damping buckle structure as claimed in claim 1, wherein the tensioning mechanism comprises a first screw sleeve, a second screw sleeve and a screw rod, the screw rod is welded with the first screw sleeve, nuts in threaded fit with the screw rod are arranged at two ends of the second screw sleeve, the peripheries of the nuts are connected through symmetrical connecting rods relative to the central connecting line of the nuts, the nuts at two ends and the symmetrical connecting rods form a rectangular hole capable of being inserted into a wrench, the screw rod connected with the first screw sleeve is symmetrically screwed into two ends of the second screw sleeve, and the first screw sleeve far away from the cambered plate is integrally connected with the single lug plate or the double lug plate.

4. The suspension bridge hinged energy-consuming damping buckle structure as claimed in claim 1, wherein the included angle between the energy-consuming bar and the horizontal plane of the main beam is 25 ° to 35 °.

5. The suspension bridge hinged energy dissipating damper structure of claim 1, wherein the bow-shaped damper connecting member is composed of a pair of symmetrically disposed bow-shaped plates, and the pair of bow-shaped plates are symmetrically disposed along a longitudinal central axis of the energy dissipating bar member.

6. The structure of claim 5, wherein the connection points between the ends of the bow plates and the tensioning mechanism and the connecting member are located on two sides of the central longitudinal axis.

7. The suspension bridge hinged energy dissipating damper structure of claim 1, wherein the arcuate plate is a C-shaped or "bow" shaped or arc shaped elastoplastic metal plate.

8. The suspension bridge hinged energy-consuming type damper buckle structure as claimed in claim 1, wherein the yield resultant force of the multiple pairs of central buckle middle arch plates in the direction parallel to the main beam and perpendicular to the main tower of the suspension bridge is greater than the internal stress generated by bending moment when the suspension bridge is fully loaded at one span and unloaded at the other span.

9. The suspension bridge articulated dissipative damping buckle structure of claim 1, wherein said arcuate plates have a low cycle life of more than 30 cycles at a plastic/equivalent elastic displacement of 12.

Technical Field

The invention relates to the technical field of suspension bridge central damping buckles, in particular to a suspension bridge hinged energy-consumption type damping buckle structure.

Background

For example, the suspension bridge shown in fig. 1 is a flexible structure, the flexibility of the structural system increases with the increase of span, and the major relative displacement generated in the longitudinal direction and the transverse direction of the main cable 1 and the main beam 2 is particularly obvious under the load action of vehicle load, earthquake, wind load and the like of the multi-span suspension bridge. For a large-span suspension bridge, when the conditions of full load in one span and no load in one span occur, the structural deformation is large, the main cable 1 generates a large unbalanced force at the tower top 3, and further generates a large bending moment at the tower bottom. In order to resist the tower bottom bending moment, the bending resistance bearing capacity of the main tower is generally improved by adjusting the section of the main tower, but the method can aggravate the slippage tendency of a main cable at the tower top. Aiming at the problems, a common solution method is mainly to realize coordination of a structural system by adjusting the main tower section and the tower top main cable anti-slip measure, but as the span of the suspension bridge increases, the main tower section will continuously increase, the tower top main cable slip trend will be aggravated, and an incongruous situation can occur between the main tower section and the tower top main cable, so that the development of the span of the multi-tower suspension bridge is restricted.

Since the central buckle is used on a Tacoma new bridge in 1950, 3 arrangement modes are developed, (1) a rigid triangular truss is used for connecting a main cable and a stiffening beam, so that the cable and the beam are relatively fixed at the midspan, namely the rigid central buckle; (2) 1 pair or more pairs of inclined slings are added in the span to establish the longitudinal restraint of the cable beam, namely a flexible central buckle; (3) the main cable is directly connected with the stiffening beam. According to the scheme, the rigidity of the suspension bridge can be effectively increased, the main beam-main cable relative displacement of the suspension bridge under the conditions of vehicle load, low-intensity earthquake, wind load and the like can be effectively reduced, but under the high-intensity earthquake environment, the common rigid central buckle or the flexible central buckle is not suitable, so that the stress of the main beam and the central buckle component is greatly increased and even damaged. The currently commonly used central button is mainly made of various section steel sections, such as I-shaped steel, channel steel and the like, or a steel-concrete combined section is adopted, and the central button in the structural form hardly has an effective damping energy consumption effect or has a very limited damping energy consumption capacity. Therefore, the functions of shock absorption and energy consumption are achieved through the research on the structure of the central buckle on the premise of ensuring the functions of the central buckle.

Therefore, it is necessary to research a center buckle structure that combines rigid connection and damping energy dissipation, so as to ensure that the center buckle structure performs the rigid connection function under relatively small loads such as vehicle load and wind load, and performs the damping energy dissipation function under the environment of high-intensity earthquake. The purpose of optimizing the suspension bridge tower and the beam is achieved.

Disclosure of Invention

The invention aims to provide a suspension bridge central damping buckle with a rigid connection function and a damping and energy-consuming function. The fatigue failure of local structures such as cables, cables and beams caused by long-term alternating stress is effectively reduced, and the overall service life of the bridge is prolonged. Meanwhile, the damping and energy dissipation functions can be realized under the high-intensity earthquake environment, and the anti-seismic performance of the main structure of the bridge is protected.

In order to achieve the purpose, the damping buckle structure for connecting the main beam and the main cable of the suspension bridge comprises a main beam and a main cable, wherein a plurality of pairs of central buckles are arranged in the main span of the main beam along the bridge direction, each pair of central buckles comprises two energy consumption rod pieces which are arranged in a splayed shape, and the damping buckle structure is characterized in that the energy consumption rod pieces comprise a tensioning mechanism, an arched damping connecting piece and a connecting piece which are sequentially connected, the tensioning mechanism comprises a thread sleeve and a screw rod, the thread sleeve is provided with a thread hole in threaded fit with the screw rod, so that the screw rod can stretch along the thread hole, the arched damping connecting piece comprises an arched plate, and two ends of the arched plate are respectively hinged with the thread sleeve of the tensioning mechanism and the connecting piece;

the tensioning mechanism is characterized in that one end, far away from the arched plate, of the tensioning mechanism is hinged to the main beam through a hinge revolute pair, one end, far away from the arched plate, of the connecting piece is hinged to a cable clamp fixedly mounted on the main cable through the hinge revolute pair, the hinge revolute pair comprises a single lug plate and a double lug plate which are arranged at two ends of the main beam, the cable clamp and the energy consumption rod piece and are matched with each other, and the single lug plate and the double lug plate which are matched with each other form a joint bearing and a main pin which are connected in.

Preferably, the tensioning mechanism is provided with a pair of thread sleeves and a screw rod, the pair of thread sleeves are sleeved at two ends of the screw rod and can rotate and displace along the screw rod, and the thread sleeves far away from the arched plate are integrally connected with the single lug plate or the double lug plates.

Preferably, the tensioning mechanism comprises a first thread sleeve, a second thread sleeve and a screw rod, the screw rod is connected with the first thread sleeve in a welding mode, nuts in threaded fit with the screw rod are arranged at two ends of the second thread sleeve, the peripheries of the nuts are connected through connecting rods which are symmetrical relative to the central connecting line of the nuts, rectangular holes which can be inserted into a wrench are defined by the nuts at the two ends and the symmetrical connecting rods, the screw rod connected with the first thread sleeve is symmetrically screwed into the two ends of the second thread sleeve, and the first thread sleeve far away from the arched plate is integrally connected with the single lug plate or the double lug plates.

As a preferred scheme, the included angle between the energy consumption rod piece and the horizontal plane of the main beam is 25-35 degrees.

Preferably, the bow-shaped damping connecting piece is composed of a pair of bow-shaped plates which are symmetrically arranged, and the pair of bow-shaped plates are symmetrically arranged along the central longitudinal axis of the energy consumption rod piece.

Preferably, the hinge points of the two ends of the pair of bow plates with the tensioning mechanism and the connecting piece are positioned on two sides of the longitudinal central axis.

Preferably, the arched plate is a C-shaped or 'bow' -shaped or arc-shaped elastic plastic metal plate.

Preferably, the yield force resultant force of the plurality of pairs of central buckling arched plates in the direction parallel to the main beam and perpendicular to the main tower of the suspension bridge is greater than the internal stress generated by bending moment when the suspension bridge is fully loaded at one span and unloaded at the other span.

Preferably, the low cycle life of the segmental plate exceeds 30 cycles under the condition that the plastic displacement/equivalent elastic displacement is 12.

The invention has the beneficial effects that: the central damping buckle structure of the suspension bridge has double functions of rigid connection and damping energy consumption, and provides favorable conditions for the optimal design of a main beam and a main tower of the suspension bridge. When the tensile force between the main cable and the main beam is smaller than the yield force of the arched plate, the arched plate does not displace under the tensile force, and the rigid connection function of the central damping buckle can effectively prevent the main beam of the large-span suspension bridge from having one-span full load and one-span no load, so that the main beam and the main cable move relatively due to the internal stress generated by bending moment, further the influence of the alternating stress generated by the relative movement on each part of the whole suspension bridge is reduced, and the fatigue resistance of the main structure of the bridge is improved; when an earthquake occurs, the tensile force between the main beam and the main cable is greater than the yield force of the arched plate, the arched plate displaces to offset the energy generated by the earthquake, and the damping energy dissipation function of the central damping buckle can effectively reduce the damage of the earthquake to the bridge and improve the earthquake resistance of the bridge.

Drawings

FIG. 1 is a schematic view of a damping center clip in an installed position on a suspension bridge;

FIG. 2 is a schematic view of the central damping buckle connection arrangement at the midspan of the suspension bridge of the present invention;

FIG. 3 is a schematic view of the installation of the energy-consuming bar structure of the present invention;

FIG. 4 is a schematic view of a single energy dissipating bar configuration of the present invention;

FIG. 5 is a side view of FIG. 4a or FIG. 4 b;

FIG. 6 is a hysteresis curve of the arcuate plate of the present invention;

fig. 7 is a load-displacement hysteresis curve of the arcuate plate of the present invention.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

As mentioned above, the prestress of the installed damping buckle is the key for realizing the rigid connection and damping energy consumption of the damping buckle, and the invention aims to optimize the function of the central buckle of the suspension bridge by changing the structure of the central buckle.

Referring to fig. 2 and 3, the central damping buckles are formed by using three sets of six energy consumption rods installed in a splayed shape, which are preferably selected in the invention, the span-middle areas of the suspension bridge are symmetrically arranged, the energy consumption rods are installed on two sides of the span-middle area of the suspension bridge at the same time, and at least one set of central damping buckle is installed on each main span under the condition of multiple spans.

The energy consumption rod piece comprises a tensioning mechanism 10, an arched damping connecting piece and a connecting piece 19 which are sequentially connected, wherein the tensioning mechanism 10 consists of a pair of screw sleeves 18 and a screw rod 13, as shown in figure 6, the screw sleeves 18 are provided with screw holes 181 which are in threaded fit with the screw rod 13, so that the pair of screw sleeves 18 are sleeved at two ends of one screw rod 13 and can rotationally move along the screw rod 13, the arched damping connecting piece consists of a pair of symmetrical arched plates 15, the pair of arched plates 15 are symmetrically arranged along the longitudinal central axis of the energy consumption rod piece, two ends of each arched plate are respectively hinged with the screw sleeves 18 and the connecting piece 19 of the tensioning mechanism 10, the screw sleeves 18 far away from the arched plates 15 are integrally connected with double lug plates 23, each arched plate 15 is a C-shaped or 'bow' -shaped (figure 4a) or an arc-shaped elastic plastic metal plate and has a hysteretic curve as shown in figure 6, K is yield rigidity, x is yield displacement, F is yield force, the ratio of post-yielding strength is 0.01, the cable bridge has almost no periodic reduction before damage, has good energy dissipation effect, has a low cycle life of more than 30 cycles under the condition that the displacement ductility (plastic displacement/equivalent elastic displacement) is 12, and has an included angle of 25-35 degrees with the horizontal plane of a main beam 101, so that the resultant force of the yield forces of a plurality of pairs of central buckling arched plates in the direction vertical to a main tower 103 of the suspension bridge is greater than the internal stress generated by bending moment when the suspension bridge has the condition of one-span full load and the other-span no load.

Referring to fig. 3 and 4b, two ends of the energy-consuming rod are respectively connected to the main beam ear plate 11 and the main cable ear plate 16. Specifically, manufacturing corresponding energy consumption rods according to design requirements, welding a main beam lug plate 11 at a corresponding position on the upper surface of a main beam 101, installing a cable clamp 20 and a main cable lug plate 16 at a corresponding position of a main cable 102, locking a fixing bolt of the cable clamp 20, measuring the actual hole distance between connecting holes on the main beam lug plate 11 and the main cable lug plate 16, finely adjusting the length of a tensioning mechanism 10 to match the installation hole position, installing a radial joint bearing 22 at the connecting hole between the main beam lug plate 11 and the main cable lug plate 16 after the length is accurately adjusted, fixing the radial joint bearing 22 by using a check ring, and coating butter; the energy consumption rod pieces are lifted to the installation position by special equipment and are fixedly connected by the pin shaft 12, and collision should be avoided in the installation process. The central damping buckles of the full bridge are sequentially installed, and after the installation is finished, the energy consumption rod piece is enabled to have 10% -15% of the corresponding pulling force under the condition of primary rigidity by utilizing force measuring equipment (such as a force measuring wrench) and adjusting the screw rod 13 through the length of the knob. All the central damping buckles of the full bridge are adjusted according to the set pretension force.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. As shown in fig. 4c, the tensioning mechanism 10 may further include a first screw sleeve 18, a second screw sleeve 17, and a screw 13, the screw 13 is connected to the first screw sleeve 18 by welding, nuts 171 screwed to the screw are disposed at two ends of the second screw sleeve 17, the peripheries of the nuts 171 are connected by symmetrical connecting rods 172 connected to the central line of the nuts, the nuts and the symmetrical connecting rods at the two ends form a rectangular hole 173 into which a wrench can be inserted, the two ends of the second screw sleeve 17 are symmetrically screwed into the screw 13 connected to the first screw sleeve 18, and the first screw sleeve 18 away from the bow plate 15 is integrally connected to the one-lug plate or the two-lug plate.

Therefore, the protection scope of the present patent shall be subject to the appended claims.