CN102998168B - Fixing device for load test of pre-stressed concrete beam and testing method - Google Patents

Fixing device for load test of pre-stressed concrete beam and testing method Download PDF

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Publication number
CN102998168B
CN102998168B CN201210500040.3A CN201210500040A CN102998168B CN 102998168 B CN102998168 B CN 102998168B CN 201210500040 A CN201210500040 A CN 201210500040A CN 102998168 B CN102998168 B CN 102998168B
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CN
China
Prior art keywords
test
force bearing
plate
loading
bearing plate
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CN201210500040.3A
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Chinese (zh)
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CN102998168A (en
Inventor
商怀帅
孙海明
杨鲁生
商洪波
卢晓梅
李荣侠
秦凯
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青岛理工大学
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Priority to CN201210500040.3A priority Critical patent/CN102998168B/en
Publication of CN102998168A publication Critical patent/CN102998168A/en
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Publication of CN102998168B publication Critical patent/CN102998168B/en

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Abstract

The invention provides a fixing device for a load test of a pre-stressed concrete beam and a testing method. The fixing device comprises two horizontal test beams with opposite flange boards which are taken as counter-force frames; fixing frames for surrounding the periphery of the end parts of the test frames are respectively arranged at the two ends of the two test beams; each fixing frame comprises an upper bearing board, a lower bearing board, a left bearing board and a right bearing board, and the end parts of all the bearing boards are connected with one another to define a framework structure; the lower lateral faces of flange boards of the test beams are located on the lower bearing boards; the left bearing boards are in contact with the bottom face of the end part of a web plate of one test beam, and the right bearing boards are in contact with the bottom face of the end part of a web plate of the other test beam; and a transverse load jack is arranged between the two test beams. The fixing device provided by the invention has the advantages of simple structure, convenience in manufacturing and use, and no damage on the beam; and the testing method in the load test with the fixing device has no need of a great number of real objects with load, and facilitates the test in situ.

Description

Prestressed concrete beam loading test stationary installation and method of testing
Technical field
The present invention relates to building structure technology field, the stationary installation of test beam and the improved improvement of method of testing during the actual carrying capacity that is specifically related to test prestressed concrete beam by loading test.
Background technology
At present, carry out in the laboratory of the general Shi of known prestressed concrete beam loading test colleges and universities, scientific research institutions, during test, test beam is positioned on large-scale pressure testing machine and is loaded.For the beams of concrete of making at the scene or the prestressed concrete beam being placed in Practical Project, (comprise and using after a period of time, the prestressed concrete beam that need identify bearing capacity by loading test), if desired by loading test, test its actual carrying capacity, there are two kinds of methods: the one, beams of concrete is pulled down, transport laboratory to, with pressure testing machine, test; The 2nd, directly carry out at the scene loading test and test, test is generally to load by preloading form at the scene, so a large amount of loads in kind of needs (tens tons even cement or reinforcing bar or other weights of up to a hundred tons).
When using method one is tested, beam deadweight is larger, during traffic expense, effort, exist simultaneously beam is caused to damage may; When using method two is tested, need to provide very large load, and have larger loading space.
Summary of the invention
The problems referred to above that exist for solving prior art, the invention provides a kind of prestressed concrete beam loading test stationary installation and method of testing, simple in structure, making and easy to use, adopts this stationary installation can not cause damage to beam, do not need a large amount of loads in kind, be convenient to test at the scene.
For reaching above-mentioned technical purpose, prestressed concrete beam loading test stationary installation proposed by the invention is achieved by the following technical solutions: a kind of prestressed concrete beam loading test stationary installation, comprise that two levels and flange plate are to putting the test beam of reaction frame each other, the two ends of two described test beams are respectively equipped with the fixed mount that surrounds the peripheral surrounding in its end, described fixed mount comprises, under, left, right four force bearing plates, the end connection of these four force bearing plates surrounds framed structure, the flange plate downside of two described test beams is positioned on described lower force bearing plate, described left force bearing plate contacts with the bottom surface, web end of a described test beam wherein, described right force bearing plate contacts with the bottom surface, web end of test beam described in another root, between two described test beams, be provided with horizontal loading lifting jack.
Between the web of two described test beams and described lower force bearing plate, be provided with height adjuster.
Described height adjuster is the unitized construction of lifting jack or steel plate or lifting jack and steel plate.
When described height adjuster is lifting jack, between described height adjuster and described lower force bearing plate, be provided with backing plate.
The end of four force bearing plates in described upper and lower, left and right connects by the mode of bolted, and the end joint face of described upper and lower two force bearing plates is provided with a plurality of bolt connecting holes.
On described left and right two force bearing plates and end described upper force bearing plate joint face, be installed with upper junction plate, on described left and right two force bearing plates and end described lower force bearing plate joint face, be installed with lower connecting plate, on described upper junction plate and described lower connecting plate, each bolt connecting hole place of corresponding described upper and lower two force bearing plates is provided with connecting hole.
The invention allows for a kind of prestressed concrete beam loading test method of testing, comprise the steps:
1), by two test beam hoisted in position, adjust test beam height and make its web in surface level;
2) by fixed mount at the both ends of two test beams installation in position, the flange plate downside of two test beams is placed on lower force bearing plate, left force bearing plate contacts with the bottom surface, web end of a test beam wherein, and right force bearing plate contacts with the bottom surface, web end of another root test beam; The horizontal loading lifting jack of installation in position between two test beams;
3) two test beams of loading jack pair are loaded, and load applies step by step by classification, the measuring point of test beam span centre side top of take is to control measuring point, after every grade of loading, surveys and reads strain value immediately, calculates itself and the difference that loads the before measurement value of reading s g , then every 2min, survey and read once, calculate the difference △ of 2min front and back reading s, and calculate relative reading difference: m=△ s/S g , when relative reading error mvalue meets 0 < m< 1%, thinks that structure is basicly stable, can carry out reading to observation station.
Between the web of two described test beams and described lower force bearing plate, be provided with height adjuster.
The end of four force bearing plates in described upper and lower, left and right connects by the mode of bolted, and the end joint face of described upper and lower two force bearing plates is provided with a plurality of bolt connecting holes.
On described left and right two force bearing plates and end described upper force bearing plate joint face, be installed with upper junction plate, on described left and right two force bearing plates and end described lower force bearing plate joint face, be installed with lower connecting plate, on described upper junction plate and described lower connecting plate, each bolt connecting hole place of corresponding described upper and lower two force bearing plates is provided with connecting hole.
Compared with prior art, prestressed concrete beam loading test fixture structure of the present invention is simple, and making and easy to use, when test prestressed concrete beam load-bearing capacity, can provide effective end anchorage, and can not cause damage to beams of concrete; Adopt the loading test method of testing of this stationary installation not need a large amount of loads in kind, be convenient to test at the scene.
Accompanying drawing explanation
Fig. 1 is the side view of embodiment of the present invention prestressed concrete beam loading test stationary installation;
Fig. 2 be in Fig. 1 A-A to cut-open view.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Shown in seeing figures.1.and.2, the present embodiment prestressed concrete beam loading test stationary installation comprises two test beams 1, two test beam 1 horizontal positioned, and its flange plate 1-1 is to putting, make two test beams reaction frame each other, the two ends of two test beams 1 are respectively equipped with the fixed mount that surrounds the peripheral surrounding in its end, fixed mount comprises force bearing plate 2, lower force bearing plate 3, left force bearing plate 4 and right force bearing plate 5, the end connection of these four force bearing plates surrounds framed structure, upper force bearing plate 2 is positioned on the flange plate 1-1 upper side of two test beams 1, contact with the flange plate 1-1 upper side of two test beams 1, the flange plate 1-1 downside of two test beams 1 is positioned on lower force bearing plate 3, lower force bearing plate 3 is contacted with the flange plate 1-1 downside of two test beams 1, left force bearing plate 4 contacts with the bottom surface of web 1-2 that is positioned at the test beam 1 in left side, right force bearing plate 5 contacts with the bottom surface of web 1-2 that is positioned at the test beam 1 on right side, between two test beams 1, according to loading, need to be provided with horizontal loading lifting jack 6, load lifting jack 6 in stress state, its bottom and jacking end are all against on the flange plate 1-1 of test beam 1.
Firm for guarantee loading the loading of lifting jack 6, its below can be supported or its top is lifted with cushion block, the center that makes to load lifting jack 6 just in time with test beam 1 Width on center superposition.In addition, different according to the concrete size of test beam 1, the number that loads lifting jack 6 can be for a plurality of.
Upper force bearing plate 2 in the present embodiment, lower force bearing plate 3, left force bearing plate 4 and right force bearing plate 5 are selected H shaped steel force bearing plate, have ribbed stiffener 12 with rigidity and the stability of reinforcement plate on force bearing plate.
For the web 1-2 that fully guarantees two test beams 1 is in horizontality, prevent destruction that beam self gravitation causes and the accuracy of warranty test result, between web 1-2 and lower force bearing plate 3, be provided with height adjuster.In the present embodiment, height adjuster is selected lifting jack 7, realizes the height control of web 1-2 by the jacking of lifting jack 7.Certainly, height adjuster also can be selected other versions, such as steel plate, by calculating web 1-2, needs padded height, selects the metal mat of suitable quantity and thickness below web 1-2, to adjust web 1-2 in horizontality; In addition, when required adjustment is highly larger, for avoiding lifting jack 7 jacking distances larger, affect its stability, height adjuster also can be selected the unitized construction of lifting jack 7 and steel plate, be about to steel plate be placed in lifting jack 7 below, lifting jack 7 is raised to certain distance.
When the preferred lifting jack 7 of height adjuster, and the flange plate width of lower force bearing plate 3 hour, for ease of placing lifting jack 7, between lifting jack 7 and lower force bearing plate 3, be provided with backing plate 8, in support jack 7, can also increase the touch panel between lifting jack 7 and lower force bearing plate 3, guarantee that lower force bearing plate 3 can not be subject to too large pressure and damage.
The end of four of upper and lower, left and right force bearing plate 2,3,4,5 is connected by the mode of bolted, on its end joint face, be provided with a plurality of bolt connecting holes 9, can be according to the spacing of the left and right force bearing plate 4,5 of the height control of test beam, after adjusting to the right place, select corresponding bolt connecting hole 9 that each force bearing plate is fastenedly connected.
Because each force bearing plate of the present embodiment is selected H shape steel plate, a left side for vertical placement, right force bearing plate 4, 5, itself and upper, lower force bearing plate 2, 3 end joint face is H type, be not easy to carry out bolt connection, for ease of realizing bolt, connect, and can realize many bolts hole regulates left, right force bearing plate 4, 5 spacing, left, right two force bearing plates 4, on 5 end joint face, be installed with upper junction plate 10, with on the end joint face of lower force bearing plate 3, be installed with lower connecting plate 11, on upper junction plate 10 and lower connecting plate 11 in correspondence, lower two force bearing plates 2, each bolt connecting hole place of 3 is provided with connecting hole 13.In the present embodiment, the setting of upper junction plate 10 and lower connecting plate 11 can adopt the mode of welding, certainly also can adopt other modes, does not do concrete restriction.
The present embodiment has also proposed a kind of prestressed concrete beam loading test method of testing, comprises the steps:
1), by two test beam hoisted in position, adjust test beam height and make its web in surface level;
2) by fixed mount at the both ends of two test beams installation in position, the flange plate downside of two test beams is placed on lower force bearing plate, left force bearing plate contacts with the bottom surface, web end of a test beam wherein, and right force bearing plate contacts with the bottom surface, web end of another root test beam; The horizontal loading lifting jack of installation in position between two test beams;
3) two test beams of loading jack pair are loaded, and load applies step by step by classification, the measuring point of test beam span centre side top of take is to control measuring point, after every grade of loading, surveys and reads strain value immediately, calculates itself and the difference that loads the before measurement value of reading s g , then every 2min, survey and read once, calculate the difference △ of 2min front and back reading s, and calculate relative reading difference: m=△ s/S g , when relative reading error mvalue meets 0 < m< 1%, thinks that structure is basicly stable, can carry out reading to observation station.
When carrying out deflection observation, load is no less than 30min stabilization time; Carry out crack resistance when observation, load is no less than 15min stabilization time.
For the web 1-2 that fully guarantees two test beams 1 is in horizontality, prevent destruction that beam self gravitation causes and the accuracy of warranty test result, between web 1-2 and lower force bearing plate 3, be provided with height adjuster.In the present embodiment, height adjuster is selected lifting jack 7, realizes the height control of web 1-2 by the jacking of lifting jack 7.Certainly, height adjuster also can be selected other versions, such as steel plate, by calculating web 1-2, needs padded height, selects the metal mat of suitable quantity and thickness below web 1-2, to adjust web 1-2 in horizontality; In addition, when required adjustment is highly larger, for avoiding lifting jack 7 jacking distances larger, affect its stability, height adjuster also can be selected the unitized construction of lifting jack 7 and steel plate, be about to steel plate be placed in lifting jack 7 below, lifting jack 7 is raised to certain distance.
The end of four of upper and lower, left and right force bearing plate 2,3,4,5 is connected by the mode of bolted, on its end joint face, be provided with a plurality of bolt connecting holes 9, can be according to the spacing of the left and right force bearing plate 4,5 of the height control of test beam, after adjusting to the right place, select corresponding bolt connecting hole 9 that each force bearing plate is fastenedly connected.
Because each force bearing plate of the present embodiment is selected H shape steel plate, a left side for vertical placement, right force bearing plate 4, 5, itself and upper, lower force bearing plate 2, 3 end joint face is H type, be not easy to carry out bolt connection, for ease of realizing bolt, connect, and can realize many bolts hole regulates left, right force bearing plate 4, 5 spacing, left, right two force bearing plates 4, on 5 end joint face, be installed with upper junction plate 10, with on the end joint face of lower force bearing plate 3, be installed with lower connecting plate 11, on upper junction plate 10 and lower connecting plate 11 in correspondence, lower two force bearing plates 2, each bolt connecting hole place of 3 is provided with connecting hole 13.In the present embodiment, the setting of upper junction plate 10 and lower connecting plate 11 can adopt the mode of welding, certainly also can adopt other modes, does not do concrete restriction.
The above, be only preferred embodiment of the present invention, is not the present invention to be done to the restriction of other form, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solution of the present invention content that do not depart from, any simple modification, equivalent variations and the remodeling above embodiment done according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.

Claims (6)

1. the prestressed concrete beam loading test method of testing based on prestressed concrete beam loading test stationary installation, described stationary installation comprises that two levels and flange plate are to putting the test beam of reaction frame each other, the two ends of two described test beams are respectively equipped with the fixed mount that surrounds the peripheral surrounding in its end, described fixed mount comprises, under, left, right four force bearing plates, the end connection of these four force bearing plates surrounds framed structure, the flange plate downside of two described test beams is positioned on described lower force bearing plate, described left force bearing plate contacts with the bottom surface, web end of a described test beam wherein, described right force bearing plate contacts with the bottom surface, web end of test beam described in another root, between two described test beams, be provided with horizontal loading lifting jack, it is characterized in that described loading test method of testing comprises the steps:
1), by two test beam hoisted in position, adjust test beam height and make its web in surface level;
2) by fixed mount at the both ends of two test beams installation in position, the flange plate downside of two test beams is placed on lower force bearing plate, left force bearing plate contacts with the bottom surface, web end of a test beam wherein, and right force bearing plate contacts with the bottom surface, web end of another root test beam; The horizontal loading lifting jack of installation in position between two test beams;
3) two test beams of loading jack pair are loaded, and load applies step by step by classification, the measuring point of test beam span centre side top of take is to control measuring point, after every grade of loading, surveys and reads strain value immediately, calculates itself and the difference that loads the before measurement value of reading s g , then every 2min, survey and read once, calculate the difference △ of 2min front and back reading s, and calculate relative reading difference: m=△ s/S g , when relative reading error m value meets 0 < m < 1%, think that structure is basicly stable, can carry out reading to controlling measuring point.
2. prestressed concrete beam loading test method of testing according to claim 1, is characterized in that: between the web of two described test beams and described lower force bearing plate, be provided with height adjuster.
3. prestressed concrete beam loading test method of testing according to claim 2, is characterized in that: described height adjuster is the unitized construction of lifting jack or steel plate or lifting jack and steel plate.
4. prestressed concrete beam loading test method of testing according to claim 3, is characterized in that: when described height adjuster is lifting jack, between described height adjuster and described lower force bearing plate, be provided with backing plate.
5. prestressed concrete beam loading test method of testing according to claim 1, it is characterized in that: the end of four force bearing plates in described upper and lower, left and right connects by the mode of bolted, and the end joint face of described upper and lower two force bearing plates is provided with a plurality of bolt connecting holes.
6. prestressed concrete beam loading test method of testing according to claim 5, it is characterized in that: on described left and right two force bearing plates and end described upper force bearing plate joint face, be installed with upper junction plate, on described left and right two force bearing plates and end described lower force bearing plate joint face, be installed with lower connecting plate, on described upper junction plate and described lower connecting plate, each bolt connecting hole place of corresponding described upper and lower two force bearing plates is provided with connecting hole.
CN201210500040.3A 2012-11-30 2012-11-30 Fixing device for load test of pre-stressed concrete beam and testing method CN102998168B (en)

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CN103439105B (en) * 2013-09-17 2015-07-08 哈尔滨工业大学(威海) Axial follow-up space loading device
CN104198587B (en) * 2014-08-12 2016-12-07 宁波大学 Concrete material is the measuring method of damage development under static load effect
CN104330276B (en) * 2014-11-11 2015-07-29 青岛建安建设集团有限公司 Measure ceiling support system Ultimate Strength Test method
CN104596836B (en) * 2014-11-28 2017-04-12 浙江工业大学 Tubular product fretting fatigue test bridge transverse fretting loading device
CN104849034A (en) * 2015-05-21 2015-08-19 江西省水利科学研究院 U-shaped groove internal and external compressive strength detection device
CN104931338B (en) * 2015-06-04 2017-06-27 廊坊市阳光建设工程质量检测有限公司 The fixing device and its making and use method of arbitrarily angled rebound test concrete test block
CN108151939B (en) * 2017-12-26 2019-03-29 中冶建筑研究总院有限公司 The method for detecting prestress value in unbonded prestressed concrete structure

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CN2497302Y (en) * 2001-08-14 2002-06-26 徐卫河 Jack universal test floor
CN101315321B (en) * 2008-07-07 2010-11-03 徐州工程学院 Test method for accurately simulating bond-slip property of male pin in tensile area
CN101408489B (en) * 2008-11-21 2011-03-23 哈尔滨工业大学 Concrete plane complicated applied force test device
CN101986128A (en) * 2010-07-07 2011-03-16 华侨大学 Multi-functional self-balancing loading reaction frame
CN201993278U (en) * 2011-01-19 2011-09-28 天津市建筑设计院 Special self-balancing horizontal loading testing device for buckling-restrained energy-dissipation braces
CN202956308U (en) * 2012-11-30 2013-05-29 青岛理工大学 Fixing device for load test of prestressed concrete beam

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