CN107563022A - A kind of T-shaped beam lateral bending additional stress decision method - Google Patents
A kind of T-shaped beam lateral bending additional stress decision method Download PDFInfo
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- CN107563022A CN107563022A CN201710710688.6A CN201710710688A CN107563022A CN 107563022 A CN107563022 A CN 107563022A CN 201710710688 A CN201710710688 A CN 201710710688A CN 107563022 A CN107563022 A CN 107563022A
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- lateral bending
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- 238000005452 bending Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000004567 concrete Substances 0.000 claims abstract description 13
- 238000004458 analytical method Methods 0.000 claims abstract 2
- 238000005259 measurement Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 5
- 238000004445 quantitative analysis Methods 0.000 abstract description 4
- 238000012937 correction Methods 0.000 abstract description 2
- 238000009795 derivation Methods 0.000 abstract 1
- 230000005484 gravity Effects 0.000 description 2
- 239000011372 high-strength concrete Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of T-shaped beam lateral bending additional stress decision method, chooses the arbitrarily high b of simply supported beam spaning middle section, wide h region as analysis object, and provide the derivation formula of maximum additional stress caused by lateral moment of flexureWherein f be degree of disturbing caused by lateral moment of flexure andWherein E be concrete modulus of elasticity, l be the moment of inertia andAccording to T-shaped beam lateral bending additional stress decision method proposed by the present invention, it is only necessary to measure T-shaped beam lateral bending degree of disturbing and modulus of elasticity, both can directly calculate additional stress caused by lateral bending, you can it is qualitative, it can also accomplish quantitative analysis completely；And the T-shaped beam lateral bending additional stress calculated, it is overlapped to the corresponding operating mode and the design stress of position provided in design document calculated description, judging T-shaped beam concrete, whether there occurs the stress more than specification permissible range under the influence of lateral bending, actually and then judge that the T-shaped beam of lateral bending should be discarded, or correction after can be continuing with.
Description
Technical field
The present invention relates to technical field of bridge engineering, specifically a kind of T-shaped beam lateral bending additional stress decision method.
Background technology
Prestressed T-shaped girder in science of bridge building, the storage during prestress application or after completion pre-stress construction
Cheng Zhong, not plummet may be deposited because of situations such as T-shaped beam, cause T-shaped beam T-shaped beam being present perpendicular to T-shaped web direction
The oblique component of gravity；Simply-supported state is in after T-shaped girder pre-stressed tensioning, the oblique component of T-shaped beam gravity turns into this freely-supported
The evenly load of beam, cause T-shaped beam that lateral thrust occurs.For this phenomenon, worldwide have at present substantial amounts of qualitative
Analysis, but quantitative analysis never was carried out to Additional Stress of Structure caused by lateral bending.
The content of the invention
In view of the above-mentioned problems, the present invention provides a kind of T-shaped beam lateral bending additional stress decision method, T-shaped beam lateral bending is added
Stress carries out quantitative analysis.
A kind of T-shaped beam lateral bending additional stress decision method, choose simply supported beam spaning middle section arbitrarily high b, wide h region conduct
Analyze object；
It is used to section resistance moment in bh regions
Bh regions simply supported beam mid span momentWherein q is T-shaped beam lateral bending evenly load, and I is the strong point of T-shaped beam
Distance；
Maximum additional stress caused by deriving lateral moment of flexureWherein f is that lateral moment of flexure causes
Degree of disturbing andWherein E be concrete modulus of elasticity, I be the moment of inertia and
Further, using the flange plate edge planes coordinate at the T-shaped beam beam-ends fulcrum of total station survey and at span centre, lead to
Cross lateral bending degree of the disturbing f that three coordinates obtain span centre.
Further, the elastic modulus E of concrete is by test measurement or with reference to the concrete in JTJ023 standards
Springform scale.
The present invention proposes a kind of brand-new T-shaped beam lateral bending additional stress decision method, it is only necessary to measures T-shaped beam lateral bending
Degree of disturbing and modulus of elasticity, it both can directly calculate additional stress caused by lateral bending, you can it is qualitative, it can also accomplish completely quantitative
Analysis；And the T-shaped beam lateral bending additional stress calculated by the method, to the corresponding operating mode provided in design document calculated description
It is overlapped with the design stress of position, judges whether there occurs allow more than specification under the influence of lateral bending for T-shaped beam concrete
The stress of scope, actually and then judge that the T-shaped beam of lateral bending should be discarded, or correction after can be continuing with.
Brief description of the drawings
Fig. 1 is the schematic diagram in bh regions in embodiment 1.
Embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.Embodiments of the invention are
Provided for the sake of example and description, and be not exhaustively or limit the invention to disclosed form.A lot
Modifications and variations are obvious for the ordinary skill in the art.Selection and description embodiment are in order to more preferable
Illustrate the principle and practical application of the present invention, and make one of ordinary skill in the art it will be appreciated that the present invention is suitable so as to design
In the various embodiments with various modifications of special-purpose.
Embodiment 1
A kind of T-shaped beam lateral bending additional stress decision method, choose simply supported beam spaning middle section arbitrarily high b, wide h region conduct
Object is analyzed, in the present embodiment, T-shaped back plate the widest part is chosen in bh regions, as shown in Figure 1.
It is used to section resistance moment in bh regions
Bh regions simply supported beam mid span momentWherein q is T-shaped beam lateral bending evenly load, and I is the strong point of T-shaped beam
Distance；
The maximum additional stress according to caused by upper two formula derives the lateral bending of T-shaped beam flange plateWherein f be degree of disturbing caused by lateral moment of flexure andWherein E is the elasticity of concrete
Modulus, I be the moment of inertia and
The bh regions of other any positions are chosen, formula can be passed throughCalculating is asked for pair
The lateral bending additional stress answered.
Degree of disturbing f can use the flange plate at the T-shaped beam beam-ends fulcrum of total station survey and at span centre caused by lateral moment of flexure
Edge planes coordinate, obtained by three coordinates；Using the strong point bracing wire span centre steel tape can also be added to measure.
The elastic modulus E of concrete passes through test measurement or the modulus of elasticity with reference to the concrete in JTJ023 standards
Table, it see the table below 1.
| Strength grade | Ec |
| C20 | 2.55×104 |
| C25 | 2.80×104 |
| C30 | 3.00×104 |
| C35 | 3.15×104 |
| C40 | 3.25×104 |
| C45 | 3.35×104 |
| C50 | 3.45×104 |
| C55 | 3.55×104 |
| C60 | 3.60×104 |
| C65 | 3.65×104 |
| C70 | 3.70×104 |
| C75 | 3.75×104 |
| C80 | 3.80×104 |
Table 1
Note：1. the modulus of elasticity of high-strength concrete, to important engineering preferably according to actual measurement and by the 0.95 of actual measurement average mean
Take again；
2. pair high-strength concrete, when the pump concrete using air entraining agent and higher sand coarse aggregate ratio and during without measured data, in table
Ec values should multiply reduction coefficient 0.90-0.95.
Obviously, described embodiment is only the part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, this area and the those of ordinary skill in the related art institute on the premise of creative work is not made
The every other embodiment obtained, should all belong to the scope of protection of the invention.
Claims (3)
1. a kind of T-shaped beam lateral bending additional stress decision method, it is characterised in that choose the arbitrarily high b of simply supported beam spaning middle section, wide h
Region as analysis object；
It is used to section resistance moment in bh regions
Bh regions simply supported beam mid span momentWherein q is T-shaped beam lateral bending evenly load, l be T-shaped beam the strong point away from
From；
Maximum additional stress caused by deriving lateral moment of flexureWherein f is disturbed caused by lateral moment of flexure
Degree andWherein E be concrete modulus of elasticity, l be the moment of inertia and
2. T-shaped beam lateral bending additional stress decision method according to claim 1, it is characterised in that using total station survey T
Flange plate edge planes coordinate at type beam beam-ends fulcrum and at span centre, lateral bending degree of the disturbing f of span centre is obtained by three coordinates.
3. T-shaped beam lateral bending additional stress decision method according to claim 1, it is characterised in that the springform of concrete
Amount E passes through test measurement or the springform scale with reference to the concrete in JTJ023 standards.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710710688.6A CN107563022A (en) | 2017-08-18 | 2017-08-18 | A kind of T-shaped beam lateral bending additional stress decision method |
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| CN201710710688.6A CN107563022A (en) | 2017-08-18 | 2017-08-18 | A kind of T-shaped beam lateral bending additional stress decision method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108419406A (en) * | 2018-02-09 | 2018-08-17 | 烽火通信科技股份有限公司 | A kind of reinforcement means of communication equipment machine frame |
| WO2020113617A1 (en) * | 2018-12-06 | 2020-06-11 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Method for determining design allowable for compression of composite material t-bar |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2579545C1 (en) * | 2014-12-22 | 2016-04-10 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Вологодский государственный университет" (ВоГУ) | Method for nondestructive inspection of carrying capacity of single-flight reinforced concrete beams |
| CN106869170A (en) * | 2017-03-31 | 2017-06-20 | 建研地基基础工程有限责任公司 | Open cut type is without big across the arch Metro Station Structure of post and design and construction method |
-
2017
- 2017-08-18 CN CN201710710688.6A patent/CN107563022A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2579545C1 (en) * | 2014-12-22 | 2016-04-10 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Вологодский государственный университет" (ВоГУ) | Method for nondestructive inspection of carrying capacity of single-flight reinforced concrete beams |
| CN106869170A (en) * | 2017-03-31 | 2017-06-20 | 建研地基基础工程有限责任公司 | Open cut type is without big across the arch Metro Station Structure of post and design and construction method |
Non-Patent Citations (1)
| Title |
|---|
| 尹涛;: "城际铁路变截面连续梁安全施工技术" * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108419406A (en) * | 2018-02-09 | 2018-08-17 | 烽火通信科技股份有限公司 | A kind of reinforcement means of communication equipment machine frame |
| CN108419406B (en) * | 2018-02-09 | 2020-01-07 | 烽火通信科技股份有限公司 | Method for reinforcing communication equipment machine frame |
| WO2020113617A1 (en) * | 2018-12-06 | 2020-06-11 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Method for determining design allowable for compression of composite material t-bar |
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