CN104502052B - The three-component method of bridge main beam static(al) under the synergy of a kind of test wind and rain - Google Patents
The three-component method of bridge main beam static(al) under the synergy of a kind of test wind and rain Download PDFInfo
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- CN104502052B CN104502052B CN201410717021.5A CN201410717021A CN104502052B CN 104502052 B CN104502052 B CN 104502052B CN 201410717021 A CN201410717021 A CN 201410717021A CN 104502052 B CN104502052 B CN 104502052B
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Abstract
The invention provides the three-component method of bridge main beam static(al) under the synergy of a kind of test wind and rain, comprise the following steps: by girder Segment Model horizontal positioned in wind-tunnel, in its lower section 2 vertical link are installed, every root small end is connected with Segment Model bottom surface fixed end, and lower end is respectively connected with a force balance; Horizontal force and the vertical force of two balances is measured under simultaneous action of wind and rain, the difference of the vertical force of their horizontal force sum, vertical force sum, leeward side and windward side balance and the product of two connecting rod spacing, just obtain resistance D, lift L and lifting moment M respectively divided by Segment Model length.The girder static(al) three-component tested under wind and rain synergy is can be implemented in section model test by the method.
Description
Technical field
The invention belongs to Wind-resistance of Bridges design and researchp field, be specifically related to the three-component method of bridge main beam static(al) under the synergy of a kind of test wind and rain.
Background technology
Along with the continuous progress of design theory and operating technique, bridge structure presents greatly across changing and the development trend of softization, and the rigidity of structure and damping constantly reduce, and this makes the susceptibility of long-span bridges to wind more outstanding.Wind comprises Static behavior and dynamic action to bridge beam action, and charming appearance and behaviour Static behavior comprises again mean wind load effect and charming appearance and behaviour static(al) unstability, and compared with dynamic buckling, without any tendency before static(al) unstability occurs, by force sudden, destructiveness is larger.Therefore, charming appearance and behaviour Static behavior has important researching value.
The research of traditional bridge structure Static behavior is all based on uniform incoming flow wind field, but for building the long-span bridge girder construction of frequently attacking region at typhoon, high wind is usually along with rainfall, special in typhoon weather, high wind is coupled with heavy rain its principal character especially.When long-span bridges is in wind and rain synergy, single consideration wind field carries out conclusion that charming appearance and behaviour function analysis draws and actually has certain deviation, and its reason is the existence of rain field and the effect of intercoupling of rain field and wind field.Therefore, consider that the impact of rainfall more meets objective reality when carrying out bridge charming appearance and behaviour Static behavior and analyzing.
Under wind and rain synergy, the static load of the unit length that the main beam section of bridge is subject to has three components: resistance D, lift L and lifting moment M(are as shown in Figure 1).For measuring this three components, Segment Model need be utilized in wind-tunnel to carry out dynamometer check.In the dynamometer check of traditional only consideration wind effect, generally the Segment Model of girder is vertically stood on force balance.This method can not be applicable to the dynamometer check under wind and rain synergy, because the direction of rain is parallel with bridge floor in the method, is not inconsistent with actual conditions (rain is vertical with bridge floor).
Therefore, under needing the synergy of a kind of test wind and rain, the three-component method of bridge main beam static(al) is to solve the problem.
Summary of the invention
Goal of the invention: the present invention is directed in prior art the defect not having the parallel double width bridge of large span, provides the three-component method of bridge main beam static(al) under the synergy of a kind of test wind and rain.
Technical scheme: for solving the problems of the technologies described above, under test wind and rain of the present invention synergy, the three-component method of bridge main beam static(al) adopts following technical scheme:
The three-component method of bridge main beam static(al) under the synergy of a kind of test wind and rain, comprises the following steps:
1), in wind-tunnel by girder Segment Model horizontal positioned, in the below of described girder Segment Model, first connecting rod and second connecting rod are vertically set, described first connecting rod is all connected with the bottom surface fixed end of described girder Segment Model with the upper end of second connecting rod, described first connecting rod is connected the first force balance and the second force balance respectively with the lower end of second connecting rod, make the zeroing data of the first force balance and the second force balance, wherein, first force balance is leeward side force balance, and the second force balance is windward side force balance;
2), open blower fan and rainfall equipment, make simultaneous action of wind and rain in described girder Segment Model, measure the horizontal force of leeward side force balance
p 1and vertical force
q 1, measure the horizontal force of windward side force balance
p 2and vertical force
q 2;
3), set girder Segment Model length as
s, the static(al) three-component under the simultaneous action of wind and rain that girder is subject to is calculated by following formula:
D=(
P 1+
P 2)/
s
L=(Q 1+
Q 2)/
s
M=(Q 1-
Q 2)
a/
s
Wherein,
d,
lwith
mbe respectively resistance, lift and lifting moment that girder is subject to,
p 1with
q 1be respectively horizontal force and the vertical force of leeward side force balance,
p 2with
q 2be respectively horizontal force and the vertical force of windward side force balance,
afor the spacing of first connecting rod and second connecting rod.
Further, described first connecting rod and second connecting rod lay respectively at the middle both sides of described girder Segment Model.
Further, described first connecting rod is equal with the distance in the middle of described girder Segment Model with second connecting rod.
Beneficial effect: under test wind and rain of the present invention synergy, the three-component method of bridge main beam static(al) is simple, conveniently can realize testing the girder static(al) three-component under wind and rain synergy in section model test.
Accompanying drawing explanation
Fig. 1 is the static(al) three-component of bridge main beam section;
Fig. 2 is the layout schematic diagram of test unit.
Embodiment
Below in conjunction with specific embodiment, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
Embodiment
The three-component method of bridge main beam static(al) under the synergy of a kind of test wind and rain, comprises the following steps:
1), in wind-tunnel by girder Segment Model horizontal positioned, in the below of girder Segment Model, first connecting rod and second connecting rod are vertically set, first connecting rod is all connected with the bottom surface fixed end of girder Segment Model with the upper end of second connecting rod, first connecting rod is connected the first force balance and the second force balance respectively with the lower end of second connecting rod, make the zeroing data of the first force balance and the second force balance, wherein, first force balance is leeward side force balance, and the second force balance is windward side force balance.First connecting rod and second connecting rod lay respectively at the middle both sides of girder Segment Model.First connecting rod is equal with the distance in the middle of girder Segment Model with second connecting rod.
2), open blower fan and rainfall equipment, make simultaneous action of wind and rain in girder Segment Model, measure the horizontal force of leeward side force balance
p 1and vertical force
q 1, measure the horizontal force of windward side force balance
p 2and vertical force
q 2;
3), set girder Segment Model length as
s, the static(al) three-component under the simultaneous action of wind and rain that girder is subject to is calculated by following formula:
D=(
P 1+
P 2)/
s
L=(Q 1+
Q 2)/
s
M=(Q 1-
Q 2)
a/
s
Wherein,
d,
lwith
mbe respectively resistance, lift and lifting moment that girder is subject to,
p 1with
q 1be respectively horizontal force and the vertical force of leeward side force balance,
p 2with
q 2be respectively horizontal force and the vertical force of windward side force balance,
afor the spacing of first connecting rod and second connecting rod.
Under test wind and rain of the present invention synergy, the three-component method of bridge main beam static(al) is simple, conveniently can realize testing the girder static(al) three-component under wind and rain synergy in section model test.
Claims (3)
1. the three-component method of bridge main beam static(al) under the synergy of test wind and rain, is characterized in that, comprise the following steps:
1), in wind-tunnel by girder Segment Model horizontal positioned, in the below of described girder Segment Model, first connecting rod and second connecting rod are vertically set, described first connecting rod is all connected with the bottom surface fixed end of described girder Segment Model with the upper end of second connecting rod, described first connecting rod is connected the first force balance and the second force balance respectively with the lower end of second connecting rod, make the zeroing data of the first force balance and the second force balance, wherein, first force balance is leeward side force balance, and the second force balance is windward side force balance;
2), open blower fan and rainfall equipment, make simultaneous action of wind and rain in described girder Segment Model, measure the horizontal force of leeward side force balance
p 1and vertical force
q 1, measure the horizontal force of windward side force balance
p 2and vertical force
q 2;
3), set girder Segment Model length as
s, the static(al) three-component under the simultaneous action of wind and rain that girder is subject to is calculated by following formula:
D=(
P 1+
P 2)/
s
L=(
Q 1+
Q 2)/
s
M=(
Q 1-
Q 2)
a/
s
Wherein,
d,
lwith
mbe respectively resistance, lift and lifting moment that girder is subject to,
p 1with
q 1be respectively horizontal force and the vertical force of leeward side force balance,
p 2with
q 2be respectively horizontal force and the vertical force of windward side force balance,
afor the spacing of first connecting rod and second connecting rod.
2. the three-component method of bridge main beam static(al) under test wind and rain as claimed in claim 1 synergy, it is characterized in that, described first connecting rod and second connecting rod lay respectively at the middle both sides of described girder Segment Model.
3. the three-component method of bridge main beam static(al) under test wind and rain as claimed in claim 2 synergy, is characterized in that, described first connecting rod is equal with the distance in the middle of described girder Segment Model with second connecting rod.
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|---|---|---|---|
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| CN104502052B true CN104502052B (en) | 2015-10-07 |
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| JP4326453B2 (en) * | 2004-10-28 | 2009-09-09 | 三菱重工業株式会社 | Two-dimensional wind tunnel and wind resistance stability evaluation method |
| CN101221553B (en) * | 2008-01-04 | 2010-09-01 | 东南大学 | Buffeting response analysis time-domain method for large span bridge under inclined wind action |
| CN102023076B (en) * | 2010-11-18 | 2012-07-11 | 西南交通大学 | Wind tunnel testing device of section model of composite structure |
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Application publication date: 20150408 Assignee: JSTI GROUP Co.,Ltd. Assignor: SOUTHEAST University Contract record no.: X2021980000085 Denomination of invention: A method for testing static three components of bridge girder under combined action of wind and rain Granted publication date: 20151007 License type: Common License Record date: 20210106 |
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