CN101510224A - Continuous rigid frame bridge external pre-stress reinforcement design method based on displacement influence line - Google Patents
Continuous rigid frame bridge external pre-stress reinforcement design method based on displacement influence line Download PDFInfo
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- CN101510224A CN101510224A CNA2008102333687A CN200810233368A CN101510224A CN 101510224 A CN101510224 A CN 101510224A CN A2008102333687 A CNA2008102333687 A CN A2008102333687A CN 200810233368 A CN200810233368 A CN 200810233368A CN 101510224 A CN101510224 A CN 101510224A
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Abstract
The invention discloses a design method of external prestress reinforcement of continuous rigid-frame bridges based on a displacement influence line. The method determines a turning position x and a bend angle Theta of an external prelstress beam according to the displacement influence line in the main beam span, lays the external prestress beam according to the determined turning position x and the bend angle Theta of the external prestress beam, and realizes the stretching and the prestress application of the external prestress beam. The invention has the beneficial technical effects that: a quick design technology of external prestress reinforcement of continuous rigid-frame bridges is disclosed from the perspective of the displacement influence line, thus opening up a new horizon of the external prestress reinforcement technology; and the quick design technology has scientific theories, feasible implementation, reliable result, outstanding effect and high efficiency.
Description
Technical field
The present invention relates to a kind of Technology Bridge Strengthening, relate in particular to a kind of continuous rigid frame bridge external prestress strengthening method based on displacement influence line.
Background technology
Bridge is being brought into play very important effect as the important component part of main artey of communications in national economic development and social development.Health with the people is the same, bridge also the time regular meeting pathology takes place, take rational reinforcement means to punish to it, just seem particularly important.The external prestressing technology is reinforced the reinforcement means that has become a kind of frequent use in the punishment at continuous rigid frame bridge.But for conventional external prestressing designing technique, generally adopt the finite element software tentative calculation to carry out external prestressing and join bundle, can not give full play to the consolidation effect of prestressing tendon, design efficiency is low.Therefore, develop and a kind ofly can carry out external prestressing fast and join bundle, the external prestressing strengthening designing technique that can give full play to the prestressing tendon consolidation effect again just seems of crucial importance.
Summary of the invention
The invention discloses a kind of continuous rigid frame bridge external prestress strengthening method based on displacement influence line, this method is determined the steering position x and the external pre-stress bundle bent angle θ of external pre-stress bundle according to the displacement influence line of girder span centre; Steering position x and external pre-stress bundle bent angle θ according to the external pre-stress bundle of determining lay external pre-stress bundle.External pre-stress bundle is carried out stretch-draw, applies prestress.
Determine that the steering position x of external pre-stress bundle and the step of external pre-stress bundle bent angle θ are:
1) Theoretical Calculation or obtain girder spaning middle section displacement influence line Equation f (x) according to the analysis of bridge structure computed in software;
2) set up vertical displacement equation F=[(f (the x)-f (x-hctg θ) of girder under the external prestressing effect] * σ
Pe* A
pSin θ, σ
PeBe steel bundle (be external pre-stress bundle, be firm material) effective prestress, A
PBe steel bundle cross-sectional area, θ is a steel bundle bent angle; H is the difference in height between the prestressing tendon center;
3) displacement equation F asks local derviation to x, θ respectively, makes F
x=0, F
θ=0, can determine the steering position x and the external pre-stress bundle bent angle θ of external pre-stress bundle.
The step of laying external pre-stress bundle is: 1) build tooth plate above the cross wall of pier top, build two deflecting plates according to the steering position x and the external pre-stress bundle bent angle θ that determine external pre-stress bundle at x, x+hctg θ place; 2) lay external pre-stress bundle, 3 according to the path of tooth plate, first deflecting plate, second deflecting plate) external pre-stress bundle is carried out stretch-draw, applies prestress.
Useful technique effect of the present invention is: proposed a kind of continuous rigid frame bridge external prestressing strengthening rapid design technology from the displacement influence line aspect, opened up the new visual field of external prestressing strengthening technology; This technical know-how science, implement feasible, reliable results, remarkably productive, efficient is high.
Description of drawings
Fig. 1 is that external prestressing tendon is arranged synoptic diagram in the continuous rigid frame bridge case beam;
Fig. 2 is the stressed synoptic diagram of external pre-stress bundle;
Fig. 3 is a girder span centre displacement influence line synoptic diagram.
In the accompanying drawing, first deflecting plate, 1, the second deflecting plate 2, external pre-stress bundle 3, tooth plate 4.
Embodiment
Be further described below in conjunction with accompanying drawing:
The key of external pre-stress bundle design, determine exactly twice turning point N position (with the distance of tooth plate 4 be x, i.e. x in the vertical displacement equation).But for conventional external prestressing designing technique, generally adopt the finite element software tentative calculation to carry out external prestressing and join bundle, can not give full play to the consolidation effect of prestressing tendon.
The present invention proposes a kind of displacement influence line and determine the steering position x and the external pre-stress bundle bent angle θ of external pre-stress bundle according to the girder span centre; Steering position x and external pre-stress bundle bent angle θ according to the external pre-stress bundle of determining lays external pre-stress bundle again.Utilize displacement influence line, can determine the steering position and the steering angle of external pre-stress bundle fast, give full play to the consolidation effect of external pre-stress bundle.
Referring to the girder span centre displacement influence line synoptic diagram shown in the accompanying drawing 3, when vehicle crossed bridge, the effect that bridge is subjected to external force can produce vertical displacement, displacement influence line be exactly characterize external force and bridge vertical displacement amount the curve of relation.Displacement influence line can obtain by measuring.
The concrete grammar that utilizes displacement influence line to carry out the external prestressing strengthening design of bridge is:
1) Theoretical Calculation or obtain girder spaning middle section displacement influence line Equation f (x) according to the analysis of bridge structure computed in software;
2) set up vertical displacement equation F=[(f (the x)-f (x-hctg θ) of girder under the external prestressing effect] * σ
Pe* A
pSin θ, σ
PeBe steel bundle effective prestress, A
pBe the cross-sectional area of external pre-stress bundle, θ is the bent angle of external pre-stress bundle; H is the difference in height between the prestressing tendon center;
3) displacement equation F asks local derviation to x, θ respectively, makes F
x=0, F
θ=0, can determine the steering position x and the external pre-stress bundle bent angle θ of external pre-stress bundle.
After the steering position x of external pre-stress bundle and external pre-stress bundle bent angle θ determine, just can lay external pre-stress bundle: 1) above the cross wall of pier top, build tooth plate 4 according to following step, build first deflecting plate, 1, the second deflecting plate 2 according to the steering position x and the external pre-stress bundle bent angle θ that determine external pre-stress bundle x, x+hctg θ place (h is known); Tooth plate 4, first deflecting plate 1, second deflecting plate 2 are used for fixing the position and the wiring path of external pre-stress bundle 3; 2) lay external pre-stress bundle according to the path of tooth plate 4, first deflecting plate 1, second deflecting plate 2; 3) external pre-stress bundle is carried out stretch-draw, applies prestress, thereby the structural internal force state of change bridge improves former bridge bearing ability.
After continuous rigid frame bridge girder inside is provided with external pre-stress bundle, improved the bearing capacity of bridge, delayed girder bending-down.Can adopt vertical displacement that external pre-stress bundle produces at the girder span centre index as the bridge strengthening effect assessment.
Claims (3)
1, a kind of continuous rigid frame bridge external prestress strengthening method based on displacement influence line is characterized in that: the steering position x and the external pre-stress bundle bent angle θ that determine external pre-stress bundle according to the displacement influence line of girder span centre; Steering position x and external pre-stress bundle bent angle θ according to the external pre-stress bundle of determining lay external pre-stress bundle.
2, the continuous rigid frame bridge external prestress strengthening method based on displacement influence line according to claim 1 is characterized in that: the steering position x and the external pre-stress bundle bent angle θ that determine external pre-stress bundle according to following step:
1) Theoretical Calculation or obtain girder spaning middle section displacement influence line Equation f (x) according to the analysis of bridge structure computed in software;
2) set up vertical displacement equation F=[(f (the x)-f (x-hctg θ) of girder under the external prestressing effect] * σ
Pe* A
pSin θ, σ
PeBe steel bundle effective prestress, A
PBe steel bundle cross-sectional area, θ is a steel bundle bent angle; H is the discrepancy in elevation between the prestressing tendon center;
3) displacement equation F asks local derviation to x, θ respectively, makes F
x=0, F
θ=0, can determine the steering position x and the external pre-stress bundle bent angle θ of external pre-stress bundle.
3, the continuous rigid frame bridge external prestress strengthening method based on displacement influence line according to claim 1 and 2, it is characterized in that: the step of laying external pre-stress bundle is: 1) build tooth plate (4) above the cross wall of pier top, build two deflecting plates (1,2) according to the steering position x and the external pre-stress bundle bent angle θ that determine external pre-stress bundle at x, x+hctg θ place; 2) lay external pre-stress bundle (3) according to the path of tooth plate (4), first deflecting plate (1), second deflecting plate (2); 3) external pre-stress bundle is carried out stretch-draw, applies prestress.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102333687A CN101510224A (en) | 2008-12-17 | 2008-12-17 | Continuous rigid frame bridge external pre-stress reinforcement design method based on displacement influence line |
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| CNA2008102333687A CN101510224A (en) | 2008-12-17 | 2008-12-17 | Continuous rigid frame bridge external pre-stress reinforcement design method based on displacement influence line |
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| CN101510224A true CN101510224A (en) | 2009-08-19 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103268397A (en) * | 2013-04-25 | 2013-08-28 | 长安大学 | Fast evaluation method for PR (reinforced concrete) simple T-girder bridge load capacity based on crack height |
| CN104389275A (en) * | 2014-12-10 | 2015-03-04 | 邢兵 | Comprehensive structure prestress reinforcing method on basis of influence line theory |
| CN107386133A (en) * | 2017-06-14 | 2017-11-24 | 暨南大学 | The oblique pull ruggedized construction and its construction method of a kind of continuous rigid frame bridge |
| CN111581693A (en) * | 2020-04-03 | 2020-08-25 | 江阴法尔胜住电新材料有限公司 | Design and manufacturing method of external prestressed beam diverter based on space rotation method |
| CN113089495A (en) * | 2021-04-30 | 2021-07-09 | 太原科技大学 | Effective prestress detection method under prestressed concrete simply supported bridge anchor |
-
2008
- 2008-12-17 CN CNA2008102333687A patent/CN101510224A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103268397A (en) * | 2013-04-25 | 2013-08-28 | 长安大学 | Fast evaluation method for PR (reinforced concrete) simple T-girder bridge load capacity based on crack height |
| CN103268397B (en) * | 2013-04-25 | 2016-06-15 | 长安大学 | RC simple T beam bridge bearing capacity rapid method for assessment based on fracture height |
| CN104389275A (en) * | 2014-12-10 | 2015-03-04 | 邢兵 | Comprehensive structure prestress reinforcing method on basis of influence line theory |
| CN107386133A (en) * | 2017-06-14 | 2017-11-24 | 暨南大学 | The oblique pull ruggedized construction and its construction method of a kind of continuous rigid frame bridge |
| CN107386133B (en) * | 2017-06-14 | 2019-03-05 | 暨南大学 | A kind of the oblique pull ruggedized construction and its construction method of continuous rigid frame bridge |
| CN111581693A (en) * | 2020-04-03 | 2020-08-25 | 江阴法尔胜住电新材料有限公司 | Design and manufacturing method of external prestressed beam diverter based on space rotation method |
| CN113089495A (en) * | 2021-04-30 | 2021-07-09 | 太原科技大学 | Effective prestress detection method under prestressed concrete simply supported bridge anchor |
| CN113089495B (en) * | 2021-04-30 | 2022-06-28 | 太原科技大学 | Method for detecting effective prestress under prestressed concrete simply supported bridge anchor |
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Open date: 20090819 |