KR20150028049A - Curved Prestressed Concrete Girder Bridge Behavior control device and method of the torsional rotation - Google Patents
Curved Prestressed Concrete Girder Bridge Behavior control device and method of the torsional rotation Download PDFInfo
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- KR20150028049A KR20150028049A KR20130106669A KR20130106669A KR20150028049A KR 20150028049 A KR20150028049 A KR 20150028049A KR 20130106669 A KR20130106669 A KR 20130106669A KR 20130106669 A KR20130106669 A KR 20130106669A KR 20150028049 A KR20150028049 A KR 20150028049A
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- prestressed concrete
- curved prestressed
- girder
- web
- curved
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- 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
- E01D2101/28—Concrete reinforced prestressed
Abstract
The present invention relates to time-independent and torsional rotational behavior caused by geometric nonlinearity of a bridge in curved prestressed concrete girder bridges to minimize the effect of torsion due to the size of the tensions, the location of the PS tensions, and the placement of additional PS wires It is an object of the present invention to provide an apparatus and method for controlling a torsional rotational behavior of a curved prestressed concrete girder bridge.
In order to accomplish the above object, the present invention provides an apparatus for controlling a torsional rotational behavior of a curved prestressed concrete girder bridge, the apparatus comprising a curved prestressed concrete double T-shaped girder as a whole, and the curved prestressed concrete double- A web disposed at a lower portion of the web; And an upper flange disposed at an upper portion across the web, wherein a PS wire for rotation control is fixedly installed at a predetermined position of the web.
In order to accomplish the above object, according to the present invention, there is provided an apparatus for controlling a torsional rotational behavior of a curved prestressed concrete girder bridge, the apparatus comprising a curved prestressed concrete box girder as a whole, and the curved prestressed concrete box girder A lower flange disposed therein; An abdomen disposed at both ends of the lower flange with a predetermined inclination; And an upper flange provided on the upper portion across the abdomen, and a PS wire for rotation control is fixedly installed at a predetermined position of the abdomen.
In order to accomplish the above object, the present invention provides a curved prestressed concrete double T type girder as a whole, and the curved prestressed concrete double T type The girder comprises a web disposed at a constant interval below the web; And an upper flange disposed at an upper portion across the web, and a PS wire for rotation control is fixedly installed at a predetermined position of the web.
According to another aspect of the present invention, there is provided a method of controlling a torsional rotational behavior of a curved prestressed concrete girder bridge, the curved prestressed concrete box girder including a curved prestressed concrete box girder, A lower flange disposed therein; An abdomen disposed at both ends of the lower flange with a predetermined inclination; And an upper flange provided on the upper portion across the abdomen, and a PS wire for rotation control is fixedly installed at a predetermined position of the abdomen.
Description
The present invention relates to an apparatus and method for controlling the torsional rotational behavior of a curved prestressed concrete girder bridge, and more particularly, to a method and apparatus for controlling the time independent and dependent torsional rotational behavior caused by geometric nonlinearity of a bridge in a curved prestressed concrete girder bridge, The present invention relates to an apparatus for controlling a torsional rotational behavior of a curved prestressed concrete girder bridge that controls the overall amount of twisting by varying the amount of twisting force and torsional force by using a tensile force applied to an additional placed PS tensor.
Recently, curved bridges have been widely used in major roads and interchanges.
The use of curved bridges is increasing due to congested traffic and economic and environmental factors.
Recently, bridges that effectively utilize the material characteristics of concrete and PS steel have been actively developed due to the improvement of analysis, design and construction technology of bridges. These bridges have been made slimmer by using the tension force of PS wire efficiently .
However, in addition to the drawbacks of reduced rigidity and resistance to vibration and fatigue caused by such slimness, the torsional resistance is also reduced as the abdomen and upper flange constituting the cross section become thinner.
Therefore, accurate interpretation and control of torsional behavior is required as the cross-sectional components of the PSC become thinner.
In general, torsional analysis of thin plate structures requires pure torsion and warping torsion behavior.
In particular, the prestressed concrete grider bridge is a prestressed concrete grider bridge because of the geometric nonlinearity of bridges, which is the initial condition of torsional rotation caused by self weight at the initial stage of construction, The shrinkage and creep phenomenon causes continuous deflection and torsional rotation behavior over time.
When the long span curved girder bridges are constructed using FCM or ILM method, it is required to control the section rotation which is caused by the torsional moment generated due to the geometric nonlinearity of the girder along with the deflection control.
In the case where these section rotations are not controlled appropriately, there is a mismatch between the joints of the two girders due to the time-dependent / independent torsional behavior in the process of final consolidation of the two girders, The bimoment is generated and the stress due to the bimoment is added to the bending stress, which causes a structural safety problem.
In addition, the continuous torsional rotation behavior can shorten the expected lifetime of bridges by changing the initial stress state, cross-sectional shape and reaction force of the bridge in the long term.
SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for estimating the time-independent and torsional rotational behavior caused by geometric nonlinearity of a bridge in a curved prestressed concrete girder bridge, And a method of controlling the torsional rotational behavior of a curved prestressed concrete girder bridge in which the influence of twisting is minimized by disposing additional PS wires.
In order to accomplish the above object, the present invention provides an apparatus for controlling a torsional rotational behavior of a curved prestressed concrete girder bridge, the apparatus comprising a curved prestressed concrete double T-shaped girder as a whole, and the curved prestressed concrete double- A web disposed at a lower portion of the web; And an upper flange disposed at an upper portion across the web, wherein a PS wire for rotation control is fixedly installed at a predetermined position of the web.
In order to accomplish the above object, according to the present invention, there is provided an apparatus for controlling a torsional rotational behavior of a curved prestressed concrete girder bridge, the apparatus comprising a curved prestressed concrete box girder as a whole, and the curved prestressed concrete box girder A lower flange disposed therein; An abdomen disposed at both ends of the lower flange with a predetermined inclination; And an upper flange provided on the upper portion across the abdomen, and a PS wire for rotation control is fixedly installed at a predetermined position of the abdomen.
In order to accomplish the above object, the present invention provides a curved prestressed concrete double T type girder as a whole, and the curved prestressed concrete double T type The girder comprises a web disposed at a constant interval below the web; And an upper flange disposed at an upper portion across the web, and a PS wire for rotation control is fixedly installed at a predetermined position of the web.
According to another aspect of the present invention, there is provided a method of controlling a torsional rotational behavior of a curved prestressed concrete girder bridge, the curved prestressed concrete box girder including a curved prestressed concrete box girder, A lower flange disposed therein; An abdomen disposed at both ends of the lower flange with a predetermined inclination; And an upper flange provided on the upper portion across the abdomen, and a PS wire for rotation control is fixedly installed at a predetermined position of the abdomen.
As described above, the apparatus and method for controlling the torsional rotational behavior of a curved prestressed concrete girder bridge according to the present invention have the following effects.
First, the present invention minimizes the effect of twisting due to the size of the tension force, the location of the PS tension material, and the placement of the additional PS steel wire in the time-independent and torsional rotational behavior caused by the geometric nonlinearity of the curved prestressed concrete girder bridge can do.
Second, the present invention can control the continuous twisting behavior of the bridge by using the PS steel wire if necessary in the long term.
Third, in the present invention, the twisting force generates a bimoment by twisting. When the bimoment acts as a normal stress on the section, the normal stress due to the bending and the normal stress due to the bimoment are simultaneously applied to the cross section. • You can control the size of the bimoment even when torsion occurs.
1 is a perspective view showing a state in which a PS wire for rotation control is installed on a curved prestressed concrete double T type girder according to the present invention,
2 is a perspective view showing a state in which a PS wire for rotation control is installed on a curved prestressed concrete box girder according to the present invention.
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
[Example 1]
1 is a perspective view showing a state in which a PS wire for rotation control is installed on a curved prestressed concrete double T type girder according to the present invention.
As shown in this drawing, the torsional rotational behavior control apparatus of a curved prestressed concrete girder bridge according to the present invention is composed of a curved prestressed concrete double T type girder (TG) as a whole, and the curved prestressed concrete double The T-shaped girder TG has a
The method of controlling a twist rotational behavior of a curved prestressed concrete girder bridge according to the present invention comprises a curved prestressed concrete double T type girder TG as a whole and a curved prestressed concrete double T type girder TG, A
That is, the apparatus and method for controlling the twist rotational behavior of a curved prestressed concrete girder bridge according to the present invention can control the overall twisting amount by changing the magnitude of the? Twisting force by using a tension force on the existing or further disposed PS steel wire .
Particularly, the present invention applies the tension force of the PS steel wire asymmetrically to the cross section.
When the PS wire is curved asymmetrically on the cross section, the tension force of the PS wire can be divided into the vertical force and the horizontal force.
As shown in Fig. 1, the vertical component of PS tensioning force generates torsional moment by eccentricity separated from the center of shear, and horizontal component of tension force occurs in bimoment, which enables to control torsional rotational behavior.
As shown in Fig. 2, when the PS wire is linearly arranged asymmetrically on the cross-section, the torsional force of the PS wire generates a bimoment to control the torsional rotational behavior.
(a) Cross section
(b) Steel wire arrangement side
(C) PS steel wire tension
(d) PS wire vertical component
(e) Vertical external force of PS wire
Figure 1. Principle of torsion moment generation by vertical component force when the curve of PS wire is arranged.
Figure 2. Twisted shape when straight line of PS wire
In order to confirm the effect of the present invention, numerical analysis was carried out on a double T-shaped curved PSC girder having three spans of 40m + 50m + 30m (curve radius R = 500 m, tension applied to the bottom of the outer web)
Figure 3. Modeling
Figure 4. Cross-sectional shape
(1) When PS wire is curved
Figure 5. Configuration of PS wire
Figure 6. Twist angle comparison
1 Span (KN)
2 Span (KN)
3 Span (KN)
case1
0 (0%)
0 (0%)
0 (0%)
case2
976 (2.5%)
1952 (5%)
976 (2.5%)
case3
1952 (5%)
3905 (10%)
1952 (5%)
() Represents the percentage of the existing tensional force magnitude (39050KN)
1 span
2 spans
Maximum value (rad.) (× 10 -5 )
Control effect (%)
Maximum value (rad.) (× 10 -5 )
Control effect (%)
case1
18.1
78.9
case2
2.8
84.4
47.8
39.4
case3
-12.5
169.2
16.8
78.7
(2) When the PS steel wire is arranged in a straight line
Figure 7. Configuration of PS wire
Figure 8. Twist angle comparison
1 Span (KN)
2 Span (KN)
3 Span (KN)
case1
0 (0%)
0 (0%)
0 (0%)
case2
976 (2.5%)
1952 (5%)
976 (2.5%)
case3
1952 (5%)
3905 (10%)
1952 (5%)
() Represents the percentage of the existing tensional force magnitude (39050KN)
1 span
2 spans
Maximum value (rad.) (× 10 -5 )
Control effect (%)
Maximum value (rad.) (× 10 -5 )
Control effect (%)
case1
18.1
78.9
case2
12.3
32.0
73.9
6.4
case3
9.2
49.3
68.8
12.9
(3) When the PS steel wire is arranged linearly on a part of the span
Figure 9. Configuration of PS wire
Figure 10. Twist angle comparison
1 Span (KN)
2 Span (KN)
3 Span (KN)
case1
0 (0%)
0 (0%)
0 (0%)
case2
976 (2.5%)
1952 (5%)
976 (2.5%)
case3
1952 (5%)
3905 (10%)
1952 (5%)
() Represents the percentage of the existing tensional force magnitude (39050KN)
1 span
2 spans
Maximum value (rad.) (× 10 -5 )
Control effect (%)
Maximum value (rad.) (× 10 -5 )
Control effect (%)
case1
18.1
78.9
case2
5.7
68.5
42.7
45.9
case3
-14.0
177.1
13.3
83.1
Therefore, in the case where the PS wire is to be arranged as a whole, the arrangement method of (3) is effective when the arrangement method of (1) is efficient and the PS wire is not required to be disposed as a whole.
(2) is more effective than the arrangement method of (1) and (3), it is more effective than the arrangement method of (1) and (3).
This is because, when placed at the bottom of the web as a whole, the bimoment of each span also affects the torsional rotation of the side span.
(1) and (3) are effective because the additional bimoment size is small at the end of the span, ie, at the end of each span.
(2) is inefficient because the bimoment near the fulcrum acts to generate a twist angle in the opposite direction to the adjacent span.
[Example 2]
2 is a perspective view showing a state where a PS wire for rotation control is installed on a curved prestressed concrete box girder according to the present invention.
As shown in this drawing, the torsional rotational behavior control device of a curved prestressed concrete girder bridge according to the present invention is composed entirely of a curved prestressed concrete box girder (BG), and the curved prestressed concrete box girder BG) comprises a lower flange (30) disposed at the bottom; An abdomen (40) disposed at both ends of the lower flange (30) with a constant inclination; And an
In addition, the method of controlling the torsional rotational behavior of a curved prestressed concrete girder bridge according to the present invention comprises a curved prestressed concrete box girder (BG) as a whole, and the curved prestressed concrete box girder (BG) A
As described above, the time-independent and torsional rotational behavior caused by the geometric nonlinearity of the bridge in the curved prestressed concrete girder bridges is changed by the torsional force of the additional placed PS tenseners. There is an effect that can control the overall twist amount.
10: web 20: upper flange
30: lower flange 40: abdomen
50: Upper flange BG: Box girder
S: PS wire for rotation control TG: Double T type girder
Claims (4)
The curved prestressed concrete double T-type girder (TG) has a web 10 arranged at a predetermined interval in the lower part thereof; And an upper flange (20) disposed at an upper portion across the web (10)
And a PS steel wire (S) for rotation control is fixedly installed at a predetermined position of the web (10). A torsional rotation behavior control device for a curved prestressed concrete girder bridge, comprising:
The curved prestressed concrete box girder (BG) has a lower flange (30) disposed at the lower part thereof; An abdomen (40) disposed at both ends of the lower flange (30) with a constant inclination; And an upper flange (50) installed on the upper portion across the abdomen (40)
And a PS strand (S) for rotation control is fixedly installed at a predetermined position of the abdomen (40).
The curved prestressed concrete double T-type girder (TG) has a web 10 arranged at a predetermined interval in the lower part thereof; And an upper flange (20) disposed at an upper portion across the web (10)
And a PS wire (S) for rotation control is fixedly installed at a predetermined position of the web (10). A method for controlling a twist rotation behavior of a curved prestressed concrete girder bridge.
The curved prestressed concrete box girder (BG) has a lower flange (30) disposed at the lower part thereof; An abdomen (40) disposed at both ends of the lower flange (30) with a constant inclination; And an upper flange (50) provided on the upper portion across the abdomen (40)
And a PS steel wire (S) for rotation control is fixedly installed at a predetermined position of the abdomen (40). A method for controlling a twist rotational behavior of a curved prestressed concrete girder bridge.
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| Application Number | Priority Date | Filing Date | Title |
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| KR20130106669A KR20150028049A (en) | 2013-09-05 | 2013-09-05 | Curved Prestressed Concrete Girder Bridge Behavior control device and method of the torsional rotation |
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| Application Number | Priority Date | Filing Date | Title |
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| KR20130106669A KR20150028049A (en) | 2013-09-05 | 2013-09-05 | Curved Prestressed Concrete Girder Bridge Behavior control device and method of the torsional rotation |
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| KR20150028049A true KR20150028049A (en) | 2015-03-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108797305A (en) * | 2018-07-17 | 2018-11-13 | 浙江工业大学 | A kind of list case concrete-more T-steels composite continuous beam bridge structure |
-
2013
- 2013-09-05 KR KR20130106669A patent/KR20150028049A/en active Search and Examination
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108797305A (en) * | 2018-07-17 | 2018-11-13 | 浙江工业大学 | A kind of list case concrete-more T-steels composite continuous beam bridge structure |
| CN108797305B (en) * | 2018-07-17 | 2023-09-01 | 浙江工业大学 | Single-box concrete-multi-T-shaped steel mixed continuous beam bridge structure |
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