CN112411360A - Tied arch bridge with netted suspender - Google Patents
Tied arch bridge with netted suspender Download PDFInfo
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- CN112411360A CN112411360A CN202011423067.8A CN202011423067A CN112411360A CN 112411360 A CN112411360 A CN 112411360A CN 202011423067 A CN202011423067 A CN 202011423067A CN 112411360 A CN112411360 A CN 112411360A
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- 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
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- 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
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D4/00—Arch-type bridges
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Abstract
The invention discloses a tied arch bridge of a reticular suspender, which comprises an arch rib, a tied bar and a plurality of inclined suspenders; the oblique suspenders are arranged between the arch rib and the tie bar, and all the oblique suspenders are arranged in a net structure; the arch rib is in a circular arc structure. The inclined suspenders are arranged in a net structure, the suspenders have larger inclination angle, more quantity, smaller distance and more in-plane crossing times, and compared with the traditional tied arch bridge with the vertical suspenders and the tied arch bridge with a Nielson suspender system, under the same span and load working condition, when the distribution length of the load on the tied bars is the same, the load can be transmitted to arch ribs in a longer range, the stress of the tied arch bridge with the net suspenders is more reasonable, and the engineering investment is saved; under the same vertical live load action, the bending moment of the arch rib and the tie bar of the tied arch bridge of the netted suspender is smaller, the structure stress is more reasonable, and the vertical deformation and the beam end corner of the arch bridge can be greatly reduced; obviously saves the quantity of materials and the construction cost.
Description
Technical Field
The invention relates to the technical field of bridges, in particular to a tied arch bridge with a net-shaped suspender.
Background
The hanger rods of the tied arch bridge commonly adopted in the current engineering mainly comprise a vertical hanger rod system and a Nielsen hanger rod system. The suspenders of the vertical suspender system are vertical suspenders, as shown in figure 1; the booms of the nelson boom system are arranged in an inclined manner as shown in fig. 2 and 3. The reasonable arch axis of the two arch bridges is a parabola, the stress performance is better under the action of the load uniformly distributed in the whole hole, and the arch rib and the tie bar mainly bear the axial force. The design control working condition of the arch bridge is vertical live-load half-hole loading, the bending moment ratio of the arch rib and the tie bar is larger, and meanwhile, the vertical displacement of the tie bar and the beam end corner reach the maximum value.
The arch rib of the tied arch bridge bears larger axial pressure and smaller bending moment, the tie bar mainly bears larger horizontal tension and smaller bending moment, and the suspender only bears tension but not pressure. After the inclined suspender is adopted to replace a vertical suspender, the axial force of the suspender is not changed greatly, but the bending moment can be partially reduced, the arch rib can be designed according to a compression bending component, and the system has a slightly smaller deflection value under the live load effect, large longitudinal rigidity and good stability. The Nielsen suspension rod system has two suspension rods at each suspension rod node, the suspension rods are only intersected at the node or are intersected once in an arch plane, under the control load working condition of live load half-span loading, although partial suspension rods of a tied arch bridge of the Nielsen suspension rod system fail (dotted line parts in figures 2 and 3), the suspension rods still participate in working at the failure node, the stress state of an arch rib can be changed, but the bending moment borne by the arch rib can be maintained at a lower level, but if the two suspension rods at the node fail simultaneously, the arch rib can bear larger bending moment and axial force.
In order to ensure that an arch system can maintain the original stress state under the condition that a suspender fails, reduce the bending moment of arch ribs and a tie bar of a tied arch bridge inheriting a Nielsen suspender system under the action of heavy-load traffic, and continuously reduce the vertical displacement of the structure and the corner of a beam end, the patent provides the tied arch bridge with the reticular suspender.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior vertical suspender system arch bridge and the tiebar arch bridge of a Nielsen suspender system in the prior art, the tiebar arch bridge of the reticular suspender is provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
a tied arch bridge with netted hanging rods is composed of arch ribs, tying rods and several oblique hanging rods;
the oblique suspenders are arranged between the arch rib and the tie bars, and all the oblique suspenders are arranged in a net structure;
the arch rib is in a circular arc structure.
A tied arch bridge of netted jib, through the above-mentioned structure, the oblique jib is the network structure and arranges, the jib angle of inclination is bigger, the quantity is more, the interval is smaller, the crossing number of times is more in the level, compare with traditional vertical jib system arch bridge and Nielsen jib system arch bridge, under the same span and load working condition, when the distribution length of the load on the tie is the same, can transmit the load to the arch rib of longer scope, the stress of the tied arch bridge of the netted jib is more rational, the deformation is smaller, thus can reduce arch rib and tie section size, save the project investment;
under the same live load level, the structure stress of the tied arch bridge of the reticular suspender is more reasonable, and the vertical deformation and the beam end corner of the arch bridge can be greatly reduced; under the same deformation control condition, the internal forces of the suspender and the arch rib of the tied arch bridge of the reticular suspender are distributed more uniformly, the maximum value of the internal force is obviously reduced, the sizes of the tied bar and the arch rib can be greatly reduced, the material consumption is saved, and the tied arch bridge is a novel, practical, economic and beautiful arch bridge system.
In a preferred embodiment of the present invention, 80% or more of the inclined booms are provided to be cross-connected to at least two of the remaining inclined booms. Through the structure, the tied arch bridge of the net-shaped suspender increases the number of suspenders and the inclination angle of the suspenders on the basis of the tied arch bridge of a Nielson suspender system, reduces the distance between the suspenders, more than 80 percent of the suspenders are crossed at least twice in an arch rib plane, under the constant load action, the vertical constant load is approximately and uniformly transmitted to the arch rib by the densely distributed oblique suspenders of the tied arch bridge of the net-shaped suspender, and the ideal arch axis generally adopts a circular curve approximately. The increase in the number of booms and the reduction in the spacing can make the booms more densely distributed in the plane of the arch rib, the shape is similar to a fishing net, so that the netted boom arch bridge can be regarded as a truss beam with variable cross section, wherein: the tie bars, the arch ribs and the suspension rods can be respectively regarded as lower chords, upper chords and web members of the trussed beams, most of shearing force is transmitted to the arch springing support through vertical component force borne by the arch ribs, the load is transmitted in a mode that bending moment borne by the main arch ribs and the tie bars is smaller, the bending moment of the main arch rib and the vertical displacement of the tie bar are smaller under the live load half-span loading control working condition, and simultaneously, compared with an arch bridge of a vertical suspender system and a Nielson suspender system, under the working condition of half-span vertical live load, the tied arch bridge of the netted suspender more uniformly transmits the vertical live load to the arch rib in a larger range through the inclined suspenders with larger inclination angle and more quantity, obviously reduces the bending moment and deformation of the arch rib and the tied rod, improves the vertical rigidity of the whole arch bridge, therefore, under the same vertical live load action, the structure stress of the tied arch bridge of the reticular suspender is more reasonable, and the vertical deformation and the beam end corner of the arch bridge can be greatly reduced; under the same deformation control condition, the internal forces of the tie bars and the arch ribs of the tied arch bridge of the netted suspender are distributed more uniformly, the maximum value of the internal force is obviously reduced, the sizes of the tie bars and the arch ribs can be greatly reduced, and the material consumption is saved.
As a preferable scheme of the present invention, the arch rib includes at least three arc segments connected in sequence, wherein the two arc segments located at both ends have the same radius.
As a preferable scheme of the present invention, the arch rib includes three sequentially connected arc segments, the radius of the arc segments at two ends is the same, and the radius is R2, the radius of the arc segment at the middle is R1, and the ratio of R2/R1 is between 0.6 and 0.8. Through the structure, vertical load can be approximately and uniformly transmitted to the arch rib through the netted system suspender, and the stress state that an ideal arch axis is an arc arch is approximately met, so that the arch rib of the tied arch bridge of the netted suspender is preferentially in the shape of an arc to reduce the bending moment of the arch rib, the curvature radius of the arc is locally reduced at an arch foot, the arch rib consists of three sections of arcs with different two radiuses (R2+ R1+ R2), and the bending moment in the arch rib can be approximately and uniformly distributed. The tied arch bridge with the net-shaped suspender can avoid the compressive stress of the suspender through a reasonable suspender angle. The tied arch bridge with the net-shaped suspender can overcome the defects that the arch rib stress of the traditional suspender arch bridge is greatly increased under the condition that the suspender fails, the stress state is changed, the arch rib arch bridge is easy to fail after stress redistribution, and the section size of the arch rib suspender is continuously increased along with the increase of the span, meanwhile, the tied arch bridge of the Nielson suspender system has the advantages of small internal force and small displacement under heavy traffic and is further optimized, the bending moment and the vertical displacement of the main arch rib and the tie bar can be greatly reduced under the same design working condition, the corresponding arch rib and the tie bar section size can be reduced, and the material consumption is saved.
As a preferable scheme of the invention, the change point of the R2 and the R1 is controlled at 0.48-0.50 times of the arch bridge rise.
As a preferred scheme of the invention, the saggital ratio of the tied arch bridge is between 0.16 and 0.18.
The rise-span ratio of the tied arch bridge is the ratio of rise to span.
As a preferable scheme of the invention, the included angle between the inclined hanger rods and the arch rib is between 55 and 60 degrees, and the intersecting nodes of the inclined hanger rods and the arch rib are uniformly arranged on the arch rib.
As a preferable scheme of the invention, when the span of the arch bridge is 100m, the number of the inclined suspenders is between 36 and 46;
or;
when the span of the arch bridge is 150m, the number of the inclined suspenders is between 38 and 48;
or;
when the span of the arch bridge is 200m, the number of the inclined suspenders is between 40 and 50;
or;
when the span of the arch bridge is 250m, the number of the oblique suspenders is between 42 and 50. Through above-mentioned structure, can make the arched bridge under heavy traffic load effect through the angle that the control jib slope was arranged and the quantity of jib, arch rib and tie rod all are in axial atress for the owner, and the less stress state of moment of flexure can give full play to the mechanical properties of steel, reduces cross-sectional dimension, reduces the material quantity.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. a tied arch bridge of netted jib, through the above-mentioned structure, the oblique jib is the network structure and arranges, the jib angle of inclination is bigger, the quantity is more, the interval is smaller, cross the number of times is more in the level, compare with traditional vertical jib system arch bridge and Nielsen jib system tied arch bridge, under the same span and load working condition, when the distribution length of the load on the tie is the same, can transmit the load to the arch rib of longer scope, the stress of the tied arch bridge of netted jib is more rational, the deformation is smaller, thus can reduce arch rib and jib section size, save the project investment;
the tied arch bridge with netted hanging rods has increased hanging rods number and reduced interval between hanging rods on the basis of tied arch bridge in Nielsen system, and has ideal arch axis similar to that of circular curve under constant load. The number of the suspenders is increased, the distance between the suspenders is reduced, the suspenders can be distributed densely in the plane of the arch rib, the shape of the suspenders is similar to that of a fishing net, and compared with an arch bridge of a vertical suspender system and a Nielson suspender system, even when half-span vertical live load is loaded, the vertical live load is more uniformly transmitted to the arch rib in a larger range by the tied arch bridge of the netted suspenders, the bending moment and the deformation of the tied rods and the arch rib are obviously reduced, axial compression is taken as a main part, the structural stress is more reasonable, and the vertical deformation and the beam end corner of the arch bridge can be greatly reduced; the sizes of the hanger rods and the arch ribs can be greatly reduced, and the material consumption is saved.
2. The invention increases the quantity and the inclination angle of the inclined suspenders on the basis of the tied arch bridge of the Nielson suspender system, reduces the distance between the suspenders, arranges the suspenders in an inclined way in the arch rib plane, crosses more than 80 percent of the suspenders in the arch rib plane at least twice, has a shape similar to a fishing net, and has more beautiful appearance.
3. The inclined angle of the hanger rods and the optimal number of the hanger rods changing with the span are adjusted to ensure that the hanger rods are in a tension state under the combination of dead load and live load half-hole loading, the included angle between the hanger rods and the arch rib is controlled to be 55-60 degrees, the number of the hanger rods is controlled to be 36-46 when the span of the arch bridge is 100m, the number of the hanger rods is controlled to be 38-48 when the span of the arch bridge is 150m, the number of the hanger rods is controlled to be 40-50 when the span of the arch bridge is 200m, and the number of the hanger rods is controlled to be 42-50 when the span of the arch bridge is 250 m. The suspension rods are uniformly arranged on the arch rib, the arrangement distance of the suspension rods on the arch rib can be calculated by combining the inclination angle of the suspension rods and the span of the arch bridge, and the arrangement of the suspension rods in the plane of the arch rib can be obtained by continuously optimizing and adjusting the distance of the suspension rods on the arch rib according to stress analysis.
4. The arch rib is in an axial compression state under the action of external load by controlling the rise-span ratio of the arch rib and the reasonable arch axis of the arch rib, the rise-span ratio of the arch rib is controlled to be between 0.6 and 0.8, the reasonable arch axis of the arch rib consists of three sections of circular arcs (R2+ R1+ R2) with two different radiuses, the change point of the circular arcs is controlled to be between 0.45 and 0.50 times the rise-span, and the ratio of the radiuses of the two circular arcs R2/R1 is between 0.6 and 0.8.
5. Because the number of the hanging rods is increased and the hanging rods are approximately uniformly distributed on the arch rib, the hanging rods are densely distributed in the plane of the arch rib, the hanging rods need to be obliquely arranged at a certain angle, and more than 80 percent of the hanging rods are crossed twice or more in the plane of the arch rib. Under the reciprocating action of heavy traffic, even if a certain suspender fails, the stress state of the arch rib and the tie bar cannot be greatly changed, and the robustness of the structure is better.
6. Because the tie bars and the arch ribs are in a state of mainly bearing the axial force, the stress is more reasonable, under the same load working condition, the bending moment and the displacement of the main arch ribs and the tie bars are greatly reduced, the cross sections of the arch ribs and the tie bars can be correspondingly reduced, the arch bridge system is lighter, and the visual aesthetic feeling can be further improved.
Drawings
FIG. 1 is a schematic illustration of a prior art vertical boom bowstring arch bridge.
FIG. 2 is a schematic view of a prior art bowden arch bridge for a Nielsen boom.
FIG. 3 is a schematic view of another prior art bowden arch bridge for a Nielsen boom.
Fig. 4 is a schematic view of a bowstring arch bridge of a mesh boom according to the present invention.
Fig. 5 is a schematic view of the side anchoring of the hanger bar of a bowstring arch bridge of the present invention.
Fig. 6 is a schematic view of the change of arch rib curve of the tied arch bridge of the net boom.
Fig. 7 is a schematic illustration of the vertical load transfer range of a bowstring arch bridge with a vertical boom.
Fig. 8 is a schematic view of the vertical load transmission range of a tied arch bridge with a net boom according to the present invention.
FIG. 9 is a schematic view of vertical boom bowstring arch bridge displacement under load control.
Fig. 10 is a schematic diagram of the displacement of a bowstring arch bridge with a net boom according to the present invention for load control.
Fig. 11 is a schematic view of a continuous structure of a tied arch bridge of the net boom of the present invention.
Icon: 1-an outer boom; 2-an inboard boom; 3-arch rib; 4-a tie bar; 5-a cross beam; 6-concrete deck slab; 7-transverse rib connection; A-R1, R2 point of change; b, the range of transmitting the vertical load on the tie bar in the arch bridge of the vertical suspender system to the arch rib; the vertical load on the tie bars of the C-net suspension bridge tied arch bridge is transferred to the range of the arch ribs.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 1-11, the present embodiment provides a tied arch bridge of a mesh boom;
in this example, compared with the stress characteristics of a tied arch bridge of a mesh boom and a vertical boom system arch bridge under the same load working condition, under the condition that the design load (live load adopts live load in ZK), the design material and the section are the same, the calculated span is 112.5m and the rise is 19.5m, the tied arch bridge arch axis of the mesh boom is composed of three sections of circular arcs with different two radiuses, R2+ R1+ R2(R1 is 91.0m, R2 is 64.0m, R2 is 0.7R1), the change points of R1 and R2 are at the rise position of 0.48 times, the boom interval of the vertical boom system arch is 6.5m, the calculation live load adopts medium-live load, and the calculation comparison table of the tied arch bridge of the mesh boom and the arch of the vertical boom system is shown in the following table:
| calculating contrast terms | Net-shaped hanging rod | Vertical boom |
| Tie-bar-maximum bending moment kN m | 9603 | 20753 |
| Arch rib-maximum bending moment kN m | 1437 | 2696 |
| Maximum displacement (mm) | 139.1 | 235.4 |
| Beam end corner (‰) | 11.5 | 16.6 |
| Boom axial force kN (maximum/minimum, both)Pulling force) | 1225/33 | 1874/320 |
The calculation results in the table show that under the same calculation conditions, the maximum bending moment of the tied arch bridge of the net-shaped suspender is obviously reduced compared with the maximum bending moment of the arch rib 3 of the arch bridge of the vertical suspender system, the maximum bending moment and the maximum displacement of the tie bar 4 of the tied arch bridge of the net-shaped suspender are about 0.4 to 0.6 times of that of the arch bridge of the vertical suspender system, and the beam end corner of the tied arch bridge of the net-shaped suspender under live load is about 0.65 to 0.7 times of that of the arch bridge of the vertical suspender system. As the span is gradually increased, the beam end corner exceeds the standard limit, and at this time, it may be preferable to provide short-side span beams with a span about 0.3 times that of the tied arch bridge of the net boom at both ends of the tied arch bridge of the net boom to form a continuous structure, so as to improve the beam end corner under live load, as shown in fig. 11.
The tied arch bridge of the netted hanging rod consists of an outer hanging rod 1, an inner hanging rod 2, an arch rib 3, a tying rod 4, a cross beam 5, a concrete bridge panel 6 and an arch rib cross link 7, wherein the hanging rods of the tied arch bridge of the netted hanging rod are obliquely arranged in an arch rib plane, more than 80 percent of the hanging rods and adjacent hanging rods are crossed at least twice, and the tied arch bridge consists of three sections of circular arcs with two different radiuses (R2+ R1+ R2). In order to ensure the stress rationality of the tied arch bridge of the netted suspender, the ratio R2/R1 of the radiuses of two circular arcs forming the arch rib 3 is preferably controlled between 0.6 and 0.8, the change point of the circular arc section is preferably controlled at (0.45 to 0.50) multiplied by f (f is the rise), the rise-span ratio (f/L, L is the span) is preferably controlled between 0.16 and 0.18, the included angle between the suspender and the arch rib 3 is preferably controlled between 55 and 60 degrees, and the crossed nodes of the suspender and the arch rib 3 are approximately and uniformly arranged on the arch rib 3.
According to the invention, the distance between the suspenders is reduced, the optimal number of the suspenders is selected according to different spans, the inclination angle of the suspenders during arrangement is controlled, and the arc change transition point, the arc radius ratio and the midspan ratio of the arch rib 3 are reasonably selected, so that the stress of an arch bridge system is more reasonable, and the vertical displacement of the tied arch bridge with the same span of net suspenders is greatly reduced under the working condition of live-load half-hole load control load, as shown in figure 10.
The suspender of the tied arch bridge of the reticular suspender is obliquely arranged in the arch rib plane, most suspenders are crossed with the suspender adjacent to the suspender at least twice in the arch rib plane, the crossing can reach 4-5 times at most, and the shape is similar to a fishing net;
the arch rib 3 is composed of two three-section circular arcs with different radiuses (R2+ R1+ R2), in order to ensure the stress rationality of the tied arch bridge of the reticular suspender, the radius ratio R2/R1 of the two circular arcs of the arch rib 3 is controlled between 0.6 and 0.8, and the change point of R2 and R1 is controlled at the sagittal height of 0.45 to 0.50 times, as shown in figure 5. The arch rib 3 adopts two three sections of circular arcs with different radiuses as reasonable arch axes.
The saggital ratio (f/L, f is saggital height, L is span) of the tied arch bridge of the net boom is controlled to be 0.16-0.18.
The intersecting nodes of the suspenders and the arch ribs 3 are approximately and uniformly arranged on the arch ribs 3, the included angle between the suspenders and the arch ribs 3 is controlled between 55 degrees and 60 degrees, and the optimal number of the suspenders changing along with the span is as follows: the number of the hanging rods is controlled to be between 36 and 46 when the span is 100m, between 38 and 48 when the span is 150m, between 40 and 50 when the span is 200m and between 42 and 50 when the span is 250 m.
The tied arch bridge with the net-shaped hanger rods has the advantages that:
the number and the inclination angle of the hanging rods are increased on the basis of the Nielson system arch bridge, the distance between the hanging rods is reduced, the hanging rods are obliquely arranged in the arch rib plane, more than 80 percent of the hanging rods are crossed at least twice in the arch rib plane, the shape is similar to a fishing net, and the appearance is more attractive;
the inclined angle of the hanger rods and the optimal number of the hanger rods changing along with the span are adjusted to enable the hanger rods to be in a tension state under the action of a live-load half-hole loading control working condition, the included angle between the hanger rods and the arch rib 3 is controlled to be 55-60 degrees, when the span of the arch bridge is 100m, the optimal number of the hanger rods is controlled to be 36-46, when the span of the arch bridge is 150m, the optimal number of the hanger rods is controlled to be 38-48, when the span of the arch bridge is 200m, the optimal number of the hanger rods is controlled to be 40-50, and when the span of the arch bridge is 250m, the optimal number of the hanger rods is controlled to be 42-50. The suspension rods are approximately and uniformly arranged on the arch rib 3, the arrangement distance of the suspension rods on the arch rib 3 can be calculated by combining the inclination angle of the suspension rods and the span of the arch bridge, and the arrangement of the suspension rods in the plane of the arch rib can be obtained by continuously optimizing and adjusting the distance of the suspension rods on the arch rib 3 according to stress analysis;
the arch rib 3 is in an axial compression state under the action of external load by controlling the rise-span ratio of the arch rib 3 and the reasonable arch axis of the arch rib 3, the rise-span ratio of the arch rib 3 is controlled to be 0.6-0.8, the reasonable arch axis of the arch rib 3 consists of three sections of circular arcs (R2+ R1+ R2) with two different half diameters, the change point of the circular arc is controlled to be 0.48 times the rise-span position, and the ratio of the two circular arc radiuses R2/R1 is 0.6-0.8;
because the number of the hanging rods is increased and the hanging rods are approximately uniformly distributed on the arch rib 3, the hanging rods are densely distributed in the plane of the arch rib, the hanging rods need to be obliquely arranged at a certain angle, and more than 80 percent of the hanging rods are crossed twice or more in the plane of the arch rib. Under the reciprocating action of heavy traffic, even if a certain suspender fails, the distance between the suspenders is not greatly increased, the arch rib 3 can maintain the original stress state, and stress redistribution can not be generated;
because jib and arch rib 3 all are in axial stress state, the material can select for use high performance steel, the performance advantage of full play material, and the atress is more reasonable, and under the same load operating mode, the moment of flexure and the vertical displacement of arch rib 3 and tie rod 4 reduce by a wide margin, and arch rib 3 and jib cross-section can correspondingly reduce for the arch bridge system is lighter-duty, and the visual aesthetic feeling can further improve.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A tied arch bridge with a reticular suspender is characterized by comprising an arch rib (3), a tied bar (4) and a plurality of oblique suspenders;
the oblique suspenders are arranged between the arch rib (3) and the tie bar (4), and all the oblique suspenders are arranged in a net structure;
the arch rib (3) is in a circular arc structure.
2. The tied arch bridge of a net boom of claim 1, wherein more than 80% of said oblique booms are arranged in a cross-connection with at least two of the remaining oblique booms.
3. A tied arch bridge of a net boom according to claim 2, wherein said arch rib (3) comprises at least three consecutive segments, wherein the two segments at both ends have the same radius.
4. A tied arch bridge of a net boom according to claim 3, characterized in that the arch rib (3) comprises three consecutive segments, the segments at both ends have the same radius and the radius R2, the segment in the middle has the radius R1, and the ratio R2/R1 is between 0.6 and 0.8.
5. The tied arch bridge of a net boom of claim 4, wherein the change point of said R2 and said R1 is controlled at 0.45-0.50 times the arch bridge's rise.
6. A tied arch bridge of mesh boom as in claim 5, wherein said tied arch bridge has a rise-to-span ratio of between 0.16 and 0.18.
7. A tied arch bridge of a mesh boom according to claim 6, characterized in that the angle between the oblique boom and the arch rib (3) is between 55 ° and 60 °, and the intersection nodes of the oblique boom and the arch rib (3) are evenly arranged on the arch rib (3).
8. The tied arch bridge of a net boom of claim 7, wherein the number of said oblique booms is between 36 and 46 when the arch bridge span is 100 m;
or;
when the span of the arch bridge is 150m, the number of the inclined suspenders is between 38 and 48;
or;
when the span of the arch bridge is 200m, the number of the inclined suspenders is between 40 and 50;
or;
when the span of the arch bridge is 250m, the number of the oblique suspenders is between 42 and 50.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113322774A (en) * | 2021-05-20 | 2021-08-31 | 湖南大学 | Ultra-high performance concrete continuous cross net-shaped arch bridge and construction method thereof |
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