CN106677079B - The continuous arch bridge reinforcement means reduced based on arch bridge impost horizontal thrust - Google Patents
The continuous arch bridge reinforcement means reduced based on arch bridge impost horizontal thrust Download PDFInfo
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- CN106677079B CN106677079B CN201710014516.5A CN201710014516A CN106677079B CN 106677079 B CN106677079 B CN 106677079B CN 201710014516 A CN201710014516 A CN 201710014516A CN 106677079 B CN106677079 B CN 106677079B
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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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling 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
- E01D4/00—Arch-type 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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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Abstract
The invention discloses a kind of continuous arch bridge reinforcement means reduced based on arch bridge impost horizontal thrust, by setting antiarch below each across main arch ring arch rib of continuous arch bridge, and it is connected between antiarch and arch rib with diagonal web member, the arch springing and arch rib of antiarch are linked together by bending resistance built-in fitting and shear amchor bolt again so that antiarch structure and former arch rib for reinforcing form rigid constraint support system；And the rigid constraint support system hogging bridge impost horizontal thrust reduces degree and waits that reinforcing arch and 7 parameters of antiarch has close relationship, by the different variate-values for setting 7 parameters, token state is changed as moment of flexure using the ratio for waiting to reinforce arch and reinforcing rear arch impost horizontal thrust, based on finite element parametric analysis approximating method, above 7 parameters and the relational expression of moment of flexure variation token state have been obtained.With the application of the invention, force value in structure feature can be solved with reference to foregoing relationships, antiarch reinforcing is carried out so as to fulfill optimal case is chosen.
Description
Technical field
The invention belongs to Arch Bridges Strengthening technical field more particularly to it is a kind of based on arch bridge impost horizontal thrust reduce it is continuous
Arch Bridges Strengthening method.
Background technology
Arch bridge be using a kind of extensive and time-honored Bridge Types in highway in China, it is but old with material
Ageization and the increasingly increased volume of traffic, most of bridge can not meet operation demand.The dead weight of some concrete arch-type bridges is larger,
Main arch ring is primarily subjected to pressure, and when external load is larger or temperature is affected, impost horizontal thrust increases, and crack increases at arch springing
More, bridge capacity declines.For continuous arch bridge, the increase of impost horizontal thrust to the safe operation of bridge more not
Profit；It is time-consuming and laborious if dismantling reconstruction, but at present and without good reinforcement means.
Concrete arch-type bridge is often that increase main arch ring cross-section, adjustment spandrel construction dead load and enhancing are laterally whole with reinforcement means
Body, affixing steel plate and fibrous composite apply external prestressing etc..Lot of examples shows the effect of original method reinforcing very
It is micro-, and the effect that the fine or not degree direct influence of bonding of new and old material is reinforced, it is runed after bridge strengthening and is shortly present with the old and new
The problems such as disengaging of material, cohesive force declines, Arch foot horizontal thrust to be reinforced is excessive to cause the common faults such as crack cannot be very
Good improvement.
The content of the invention
The technical problem to be solved in the present invention is to provide it is a kind of it is easy for construction, simple and reliable, work well based on arch bridge
The continuous arch bridge reinforcement means that impost horizontal thrust reduces.
In order to solve the above technical problems, the present invention uses following technical scheme：
Based on the continuous arch bridge reinforcement means that arch bridge impost horizontal thrust reduces, by each across main arch ring of continuous arch bridge
Antiarch below arch rib is set, and is connected between antiarch and arch rib with diagonal web member, then passes through bending resistance built-in fitting and shear amchor bolt handle
The arch springing and arch rib of antiarch link together so that antiarch structure and former arch rib for reinforcing form rigid constraint supporter
System；And the rigid constraint support system meets relationship below：
In formula：
Wait reinforce arch and antiarch 7 parameters be respectively antiarch and wait reinforce arch equivalent redius than i, wait reinforce encircle meter
It calculates across footpath L, wait to reinforce the ratio of rise to span S of arch1, wait reinforce arch arch axis coefficient m1, S is compared in the rise of antiarch and span of arch footpath to be reinforced2、
The arch axis coefficient m of antiarch2The across footpath of antiarch and the ratio K in span of arch footpath to be reinforcedr；
RfFor antiarch equivalent redius, IX, fIt is used to for the x directions of antiarch
Property square, RoriTo wait to reinforce arch equivalent redius, IX, oriTo wait to reinforce arch x directions the moment of inertia；
S1=f1/ L, S2=f2/ L, L calculate across footpath, f to wait to reinforce arch1、f2Respectively antiarch and the rise for treating reinforcing arch,
Fx be antiarch reinforce after impost horizontal thrust, FxoriFor arch structure impost horizontal thrust to be reinforced.
Antiarch span is the 1/4-1/2 of main span of arch degree.
It waits to reinforce the arch axis coefficient m encircleed1Value between 2-8, the arch axis coefficient m of antiarch2Value between 2 and 6.
It waits to reinforce the ratio of rise to span S encircleed1For scope between 3/25-1/5, the rise of antiarch compares S with span of arch footpath to be reinforced2Model
It is trapped among between 0.02-0.06.
Antiarch and wait reinforce arch equivalent redius than i value between 0.5-1.0.
Between diagonal web member sectional area value is 0.5-0.75 times of antiarch sectional area.
For existing Arch Bridges Strengthening there are the problem of, inventor establish it is a kind of based on arch bridge impost horizontal thrust reduce
Continuous arch bridge reinforcement means, by setting antiarch below each across main arch ring arch rib of continuous arch bridge, and antiarch and arch rib it
Between be connected with diagonal web member, then the arch springing and arch rib of antiarch are linked together by bending resistance built-in fitting and shear amchor bolt so that use
Antiarch structure and former arch rib to reinforce form rigid constraint support system；And the rigid constraint support system hogging bridge arch foot
Horizontal thrust reduce degree and wait reinforce arch and antiarch 7 parameters (antiarch with treat reinforcing encircle equivalent redius than i, wait to reinforce
The calculating across footpath L of arch, wait to reinforce the ratio of rise to span S of arch1, wait reinforce arch arch axis coefficient m1, the rise of antiarch and span of arch footpath to be reinforced
Compare S2, antiarch arch axis coefficient m2, the ratio K in the across footpath of antiarch and span of arch footpath to be reinforcedr) there is close relationship, by setting 7
The different variate-values of a parameter are characterized using the ratio for waiting to reinforce arch and reinforcing rear arch impost horizontal thrust as moment of flexure variation
Amount based on finite element parametric analysis approximating method, has obtained above 7 parameters and the relational expression of moment of flexure variation token state.Therefore,
For the arch bridge of different designs parameter, with the application of the invention, force value in structure feature can be solved with reference to foregoing relationships, so as to real
It now chooses optimal case and carries out antiarch reinforcing, can not only increase the overall stiffness for treating reinforcement bridge, and can effectively reduce
The internal force in crucial section, the antiarch structure of reinforcing have good mechanical characteristic.To sum up, easy construction of the present invention, it is with obvious effects,
Calculate simple, accuracy height, with wide engineering application prospect.
Description of the drawings
Fig. 1 is that the present invention reinforces schematic diagram.
Fig. 2 is impost horizontal thrust fitting bit map/bitmap.
Fig. 3 is that certain bridge is schemed after reinforcing in the example using the present invention.
Fig. 4 is that horizontal thrust reduces the graph that percentage changes with parameter equivalent radius ratio i after being reinforced using the present invention.
Fig. 5 is that horizontal thrust reduces the curve that percentage changes with parameter antiarch arch axis coefficient m2 after being reinforced using the present invention
Figure.
Fig. 6 is that horizontal thrust reduces the graph that percentage changes with the ratio between parameter across footpath Kr after being reinforced using the present invention.
Fig. 7 is that horizontal thrust reduces the graph that percentage changes with parameter antiarch ratio of rise to span S2 after antiarch method is reinforced
In figure：1 arch springing, 2 antiarch reinforced, 3 former arch ribs, 4 bending resistance built-in fittings, 5 shear amchor bolts, 6 diagonal web members, 7 bridge decks.
Specific embodiment
First, basic principle
The continuous arch bridge reinforcement means reduced based on arch bridge impost horizontal thrust --- by each across master of continuous arch bridge
Antiarch below arch ring arch rib is set, and is connected between antiarch and arch rib with more diagonal web members, then by bending resistance built-in fitting and is resisted
It cuts anchor bolt to link together the arch springing and arch rib of antiarch so that antiarch structure and former arch rib for reinforcing form rigid constraint
Support system, so as to be effective against and share by arch rib transfer moment of flexure, while can increase arch rib overall stiffness and
Intensity greatly reduces impost horizontal thrust value.
For this system, intended using the vault moment of flexure after reinforcing and unguyed vault moment of flexure ratio as characterization value
It closes, by (2700, see Fig. 2) fittings of mass data, obtains relational expression of the characterization value across total moment M z and known relevant parameter
(as follows), so as to obtain optimal Reinforcing parameter；
In formula：
Wait reinforce arch and antiarch 7 parameters be respectively antiarch and wait reinforce arch equivalent redius than i, wait reinforce encircle meter
It calculates across footpath L, wait to reinforce the ratio of rise to span S of arch1, wait reinforce arch arch axis coefficient m1, S is compared in the rise of antiarch and span of arch footpath to be reinforced2、
The arch axis coefficient m of antiarch2, the ratio K in the across footpath of antiarch and span of arch footpath to be reinforcedr；
RfFor antiarch equivalent redius, IX, fIt is used to for the x directions of antiarch
Property square, RoriTo wait to reinforce arch equivalent redius, IX, oriTo wait to reinforce arch x directions the moment of inertia；
S1=f1/ L, S2=f2/ L, L calculate across footpath, f to wait to reinforce arch1、f2Respectively antiarch and the rise for treating reinforcing arch,
Fx be antiarch reinforce after impost horizontal thrust, FxoriFor arch structure impost horizontal thrust to be reinforced.
According to above-mentioned relation formula, if the parameter for waiting to reinforce arch is it is known that needs can be obtained by changing antiarch parameter
Impost horizontal thrust reduces desired value.The value range for having related parameter is as follows：
Antiarch span is the 1/4-1/2 of main span of arch degree.
It waits to reinforce the arch axis coefficient m encircleed1Value between 2-8, the arch axis coefficient m of antiarch2Value between 2 and 6.
It waits to reinforce the ratio of rise to span S encircleed1For scope between 3/25-1/5, the rise of antiarch compares S with span of arch footpath to be reinforced2Model
It is trapped among between 0.02-0.06.
Antiarch and the equivalent redius for waiting to reinforce arch are not limited to circular cross-section than i, and arbitrary section pattern all can be by above-mentioned
Formula scales obtain, and value is between 0.5-1.0.
Between diagonal web member sectional area value is 0.5-0.75 times of antiarch sectional area, but cross section parameter is to reinforcing rear arch ribbed arch
The effect unobvious that foot horizontal thrust reduces.
Application example
The deck type concrete continuous arch bridge of certain 264m across footpath after a period of time has been used, finds pushing away for intermediate bridge pier
Power is larger so that arch rib span centre lower flange is cracked, so need reinforcement with it is effective while reduce thrust at springer and span centre
Section turn moment.Former bridge is reinforced (Fig. 3) using the method that antiarch is reinforced using the present invention, the arch springing level after reinforcing that calculates pushes away
Power and the ratio for reinforcing front abutment horizontal thrust.
Arch bridge single span across footpath L=100m, ratio of rise to span S to be reinforced1=1/6, arch axis coefficient m1=5, antiarch reinforces arch etc. with waiting
Imitate the ratio between radius i values 0.85, arch axis coefficient m2=3, rise f2=4m, across footpath L2Parameter is brought into aforementioned formula by=20m：
In formula：It is 0.969 that can obtain the ratio before reinforcing thick impost horizontal thrust value and reinforcing, horizontal thrust
Reduce 3.1%.
It can be seen that the present invention is reinforced with certain effect to concrete-bridge, analyzed by mass data, it is anti-by being based on
The method of arch structure reinforced concrete arch bridge or steel arch bridge may be such that this type concrete arch-type bridge or steel arch bridge impost horizontal thrust
There is certain reduction, mid span moment is substantially reduced, and brings certain project benefit.
By constantly adjusting the parameter of antiarch, the reduction that different schemes correspond to arch bridge impost horizontal thrust to be reinforced is obtained
Amount situation is shown in Table 1-4 and Fig. 4~7：
1 main arch ring impost horizontal thrust of table reduces percentage with antiarch and waits to reinforce arch variation of the equivalent redius than i
2 main arch ring horizontal thrust of table reduces percentage with antiarch arch axis coefficient m2Variation
3 main arch ring horizontal thrust of table reduces variation of the percentage with the ratio between across footpath Kr
4 main arch ring horizontal thrust of table reduces variation of the percentage with S2
To sum up, impost horizontal thrust has following rule：
(1) the smaller consolidation effect of antiarch across footpath is better, but need to consider construction and take into account whole stress；
(2) rise of reinforcing antiarch is higher, and consolidation effect is better；
(3) under conditions permit, reinforce that the across footpath of antiarch is bigger, and consolidation effect is better；
(4) when the arch axis coefficient for reinforcing arch is very big, if reinforced using this present invention, arch springing level can be reduced
Thrust magnitude, the average amplitude of reduction reach 6%.
Claims (6)
1. a kind of continuous arch bridge reinforcement means reduced based on arch bridge impost horizontal thrust, it is characterised in that：By in continuous arch
Antiarch is set below each across main arch ring arch rib of bridge, and is connected between antiarch and arch rib with diagonal web member, then it is pre-buried by bending resistance
Part and shear amchor bolt link together the arch springing and arch rib of antiarch so that antiarch structure and former arch rib for reinforcing are formed just
Property constraint support system：And the rigid constraint support system meets relationship below：
In formula：
Wait reinforce arch and antiarch 7 parameters be respectively antiarch and wait reinforce arch equivalent redius than i, wait reinforce encircle calculating across
Footpath L, wait to reinforce the ratio of rise to span S of arch1, wait reinforce arch arch axis coefficient m1, S is compared in the rise of antiarch and span of arch footpath to be reinforced2, antiarch
Arch axis coefficient m2, the ratio K in the across footpath of antiarch and span of arch footpath to be reinforcedr；
RfFor antiarch equivalent redius, IX, fFor the x directions the moment of inertia of antiarch,
RoriTo wait to reinforce arch equivalent redius, IX, oriTo wait to reinforce arch x directions the moment of inertia；
S1=f1/ L, S2=f2/ L, L calculate across footpath, f to wait to reinforce arch1、f2Respectively antiarch and the rise for treating reinforcing arch, Fx are
Impost horizontal thrust after antiarch reinforcing, FxoriFor arch structure impost horizontal thrust to be reinforced.
2. the continuous arch bridge reinforcement means according to claim 1 reduced based on arch bridge impost horizontal thrust, feature are existed
In：The antiarch span is the 1/4-1/2 of main span of arch degree.
3. the continuous arch bridge reinforcement means according to claim 1 reduced based on arch bridge impost horizontal thrust, feature are existed
In：The arch axis coefficient m for waiting to reinforce arch1Value between 2-8, the arch axis coefficient m of antiarch2Value between 2 and 6.
4. the continuous arch bridge reinforcement means according to claim 1 reduced based on arch bridge impost horizontal thrust, feature are existed
In：The ratio of rise to span S for waiting to reinforce arch1For scope between 3/25-1/5, the rise of antiarch compares S with span of arch footpath to be reinforced2Scope
Between 0.02-0.06.
5. the continuous arch bridge reinforcement means according to claim 1 reduced based on arch bridge impost horizontal thrust, feature are existed
In：The antiarch and wait reinforce arch equivalent redius than i value between 0.5-1.0.
6. the continuous arch bridge reinforcement means according to claim 1 reduced based on arch bridge impost horizontal thrust, feature are existed
In：Between the diagonal web member sectional area value is 0.5-0.75 times of antiarch sectional area.
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| CN108416116B (en) * | 2018-02-09 | 2021-10-22 | 广西交通科学研究院有限公司 | Method for determining arch crown weight during arch springing enlarged section reinforcing parabolic arch |
| CN109487710B (en) * | 2018-12-19 | 2024-02-27 | 长沙理工大学 | Arch bridge reinforcement method based on prefabricated assembly principle |
| CN112482188B (en) * | 2020-11-26 | 2022-06-24 | 温州市市政管理中心 | Arch bridge reinforced structure and construction method thereof |
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