CN104458401A - Continuous beam testing method - Google Patents
Continuous beam testing method Download PDFInfo
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- CN104458401A CN104458401A CN201410759895.7A CN201410759895A CN104458401A CN 104458401 A CN104458401 A CN 104458401A CN 201410759895 A CN201410759895 A CN 201410759895A CN 104458401 A CN104458401 A CN 104458401A
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Abstract
The invention provides a continuous beam testing method. The method specifically comprises the following steps: adding a 5kN load at each stage when loading begins until critical concrete cracks; adding a 10kN load at each stage after the concrete cracks until a 0.5mm-wide crack appears near each control section; adding a 5kN load at each stage when the width of the maximum crack of the test beam exceeds 0.5mm until a proximity structure is finally damaged. A continuous beam testing device provided by the invention has a simple structure, can be used for effectively testing a continuous beam and has accurate test results.
Description
Technical field
The present invention relates to a kind of continuous beam test method, belong to field of mechanical technique.
Background technology
In recent years, foreign scholar is mainly that point of penetration has carried out more correlation test research and theoretical analysis with free beam for the utilization of CFRP-PCPs composite reinforcing in xoncrete structure, but then relatively less for the experimental study of CFRP-PCPs composite rebar concrete continuous beam.And the special test figure for CFRP-PCPs composite rebar concrete continuous beam plastic internal force redistribution rule is less, also requires study to the determination of its Study on Moment Modulation of Prestressed value.
Summary of the invention
The invention provides a kind of continuous beam test method, the above defect can be overcome.
For solving above technical matters, the invention provides following technical scheme: a kind of continuous beam test method, comprising load sensor, screw jack, electron displacement meter, reaction frame, hydraulic jack; After being connected by test unit, before official test, first should carry out prestrain to test beam, to check whether each test apparatus normally works and whether test beam lays stable and centering; Be preloaded as and calculate 10% of cracking load, slowly unload after loaded, adjust each test apparatus according to the result of prestrain; During formal loading, in advance according to the failing load value hierarchical loading calculated, because adopt oil pump to load, in order to can better controlled loading speed and obtain metastable deformation values when observation structure, test all carries out hierarchical loading by every grade of 10kN place, holds lotus and gather all data after 3 minutes after every one-level; Wherein concrete load step is as follows:
1, from be loaded on critical concrete cracking time, load by every grade of 5kN load;
When 2, occurring from the crack having width to reach 0.5mm near each controlling sections after concrete cracking, load by every grade of 10kN load;
When 3, finally destroying to contiguous structure from the maximum crack width of test beam more than 0.5mm, load by every grade of 5kN load.
This continuous beam test method that the present invention relates to, in order to study the plastic property of CFRP-PCPs composite rebar concrete continuous beam, preparing 6 composite rebar concrete two span continuous beam test specimens altogether, by experimental study, mainly having completed following relevant item work:
(1) the static load mechanical test of 6 CFRP-PCPs composite rebar concrete two span continuous beam is completed.
(2) test beam has been carried out observing two across the crack form near each controlling sections of span centre and middle bearing place and the regularity of distribution, load-amount of deflection change curve etc. and made analysis.
(3) at the stress performance in each stage, the change procedure of end reaction and final damage-form, observation and analysis has been carried out to test beam.
(4) omnidistance observational record has been carried out to strain values such as the regular reinforcement in test beam, CFRP-PCPs composite reinforcing and concrete.
(5) observation and analysis has been carried out to continuous beam plastic internal force redistribution phenomenon.
This continuous beam test unit that the present invention relates to, structure is simple, and can effectively test continuous beam, test findings is accurate.
Accompanying drawing explanation
Fig. 1 is a kind of continuous beam test unit of the present invention structural representation;
1 load sensor I; 2 load sensor II; 3 screw jack; 4 electron displacement meters; 5 load sensor III; 6 reaction frames; 7 hydraulic jack.
Embodiment
As shown in Figure 1, a kind of continuous beam test method, comprises load sensor I1, load sensor II2, load sensor III5, screw jack, electron displacement meter, reaction frame, hydraulic jack; After being connected by test unit, before official test, first should carry out prestrain to test beam, to check whether each test apparatus normally works and whether test beam lays stable and centering; Be preloaded as and calculate 10% of cracking load, slowly unload after loaded, adjust each test apparatus according to the result of prestrain; During formal loading, in advance according to the failing load value hierarchical loading calculated, because adopt oil pump to load, in order to can better controlled loading speed and obtain metastable deformation values when observation structure, test all carries out hierarchical loading by every grade of 10kN place, holds lotus and gather all data after 3 minutes after every one-level; Wherein concrete load step is as follows:
1, from be loaded on critical concrete cracking time, load by every grade of 5kN load;
When 2, occurring from the crack having width to reach 0.5mm near each controlling sections after concrete cracking, load by every grade of 10kN load;
When 3, finally destroying to contiguous structure from the maximum crack width of test beam more than 0.5mm, load by every grade of 5kN load.
Embodiment of the present invention does not form the restriction to the application's scope; within every spirit in the present invention's design and principle, any amendment that one of skill in the art can make, equivalent to replace and improvement etc. all should be included within protection scope of the present invention.
Claims (1)
1. a continuous beam test method, is characterized in that, comprises load sensor, screw jack, electron displacement meter, reaction frame, hydraulic jack; After being connected by test unit, before official test, first should carry out prestrain to test beam, to check whether each test apparatus normally works and whether test beam lays stable and centering; Be preloaded as and calculate 10% of cracking load, slowly unload after loaded, adjust each test apparatus according to the result of prestrain; During formal loading, in advance according to the failing load value hierarchical loading calculated, because adopt oil pump to load, in order to can better controlled loading speed and obtain metastable deformation values when observation structure, test all carries out hierarchical loading by every grade of 10kN place, holds lotus and gather all data after 3 minutes after every one-level; Wherein concrete load step is as follows:
(1) from be loaded on critical concrete cracking time, load by every grade of 5kN load;
(2), when occurring from the crack having width to reach 0.5mm near each controlling sections after concrete cracking, load by every grade of 10kN load;
(3), when finally destroying to contiguous structure from the maximum crack width of test beam more than 0.5mm, load by every grade of 5kN load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410759895.7A CN104458401A (en) | 2014-12-12 | 2014-12-12 | Continuous beam testing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410759895.7A CN104458401A (en) | 2014-12-12 | 2014-12-12 | Continuous beam testing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104458401A true CN104458401A (en) | 2015-03-25 |
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| CN201410759895.7A Pending CN104458401A (en) | 2014-12-12 | 2014-12-12 | Continuous beam testing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865819A (en) * | 2016-04-18 | 2016-08-17 | 湖南联智桥隧技术有限公司 | Method for load test of single beam |
| CN107727836A (en) * | 2017-11-27 | 2018-02-23 | 招商局重庆交通科研设计院有限公司 | Tunnel Lining Cracks determination experiment device and method containing sprayed coating |
| CN109781549A (en) * | 2019-01-31 | 2019-05-21 | 中铁六局集团有限公司 | U-shaped beam Static Load Test Method |
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| JP2002296159A (en) * | 2001-03-30 | 2002-10-09 | Matsumura Gumi Corp | Test apparatus for loading flat plate and recording medium |
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| CN102507248A (en) * | 2011-11-09 | 2012-06-20 | 上海同豪土木工程咨询有限公司 | Method for testing whether bridge bearing has void |
| CN102914473A (en) * | 2012-09-27 | 2013-02-06 | 大连民族学院 | Method for recognizing cross-section bending moment and curvature relation of reinforced concrete beam |
| CN104749047A (en) * | 2015-04-15 | 2015-07-01 | 上海市建筑科学研究院(集团)有限公司 | Bent member mechanical property testing device and application method thereof |
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2014
- 2014-12-12 CN CN201410759895.7A patent/CN104458401A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| JP2002296159A (en) * | 2001-03-30 | 2002-10-09 | Matsumura Gumi Corp | Test apparatus for loading flat plate and recording medium |
| US20110110393A1 (en) * | 2009-11-10 | 2011-05-12 | Korea Institute Of Construction Technology | Heating furnace for testing middle and long span structures |
| CN102507248A (en) * | 2011-11-09 | 2012-06-20 | 上海同豪土木工程咨询有限公司 | Method for testing whether bridge bearing has void |
| CN102914473A (en) * | 2012-09-27 | 2013-02-06 | 大连民族学院 | Method for recognizing cross-section bending moment and curvature relation of reinforced concrete beam |
| CN104749047A (en) * | 2015-04-15 | 2015-07-01 | 上海市建筑科学研究院(集团)有限公司 | Bent member mechanical property testing device and application method thereof |
Non-Patent Citations (2)
| Title |
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| 屈建: "新型CFRP-PCPs复合筋混凝土梁受力性能试验研究与理论分析", 《CNKI中国优秀硕士学位论文全文库》 * |
| 欧阳利军等: "玄武岩纤维布加固混凝土连续梁抗弯试验研究", 《玻璃钢/复合材料》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865819A (en) * | 2016-04-18 | 2016-08-17 | 湖南联智桥隧技术有限公司 | Method for load test of single beam |
| CN107727836A (en) * | 2017-11-27 | 2018-02-23 | 招商局重庆交通科研设计院有限公司 | Tunnel Lining Cracks determination experiment device and method containing sprayed coating |
| CN109781549A (en) * | 2019-01-31 | 2019-05-21 | 中铁六局集团有限公司 | U-shaped beam Static Load Test Method |
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Application publication date: 20150325 |