CN205656080U - Three -point bending test device of test concrete breaking property ability - Google Patents
Three -point bending test device of test concrete breaking property ability Download PDFInfo
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- CN205656080U CN205656080U CN201620270340.0U CN201620270340U CN205656080U CN 205656080 U CN205656080 U CN 205656080U CN 201620270340 U CN201620270340 U CN 201620270340U CN 205656080 U CN205656080 U CN 205656080U
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Abstract
The utility model discloses a three -point bending test device of test concrete breaking property ability, the device include testing machine base, testing machine cushion cap, two support columns, servo pressure machine, two spiral sliders, pressure backing plate, column type pressure sensor, single -point loading support, cassette, gasket, two movable hinged -supports, two wedge edges of a knife, double -layered formula tens(i)ometer, fixed screw, two displacement sensor. The device of the utility model is simple in structure, rationally, the cost is lower, and can be formed by the transformation of concrete compression testing machine, can be directed against not unidimensional concrete specimen and carry out three -point bending test, and pressure sensor, clamp formula tens(i)ometer, displacement sensor be independent data collection all, and the data measurement precision is high, easily operate, and convenient to detach, wherein single -point load support can be dismantled to replace and be two some load supports, carries out 4 camber beams experiments, a tractor serves several purposes.
Description
Technical field
The present invention relates to the mechanical property testing technical field of civil engineering, a kind of three point bending test device testing concrete fracture performance.
Background technology
Along with China's rapid development of economy, more and more such as large-scale concrete engineering projects such as concrete dam, offshore oil platform, atomic reactor are brought into schedule.And concrete is as a kind of high fragility, low tensile materials, when carrying out these large-sized concrete projects, in work progress temperature stress or the endogenous cause of ill such as pouring quality is the best with in use will produce crack in concrete due to the exopathogenic factor such as load or environmental factors, and once produce crack, xoncrete structure can destroy in the case of actual stress is much smaller than its tensile strength, thus greatly reduces safety and the service life of xoncrete structure.The existence in crack is inevitable, in order to solve in the case of macrocrack, and the extension in crack and the degree of safety problem of structure, need preferably to be designed the repairing and reinforcing scheme of concrete by the fracture characteristics of test concrete.
At present at test concrete fracture aspect of performance, in the world for international material and structural test community (RILEM) recommend 3 camber beam destructive tests application based on two-parameter model wider, but the method requires to follow in process of the test and badly adds unloading, requires higher to test apparatus.And the double-K fracture criterion three-point bending beam destructive test that Chinese scholar Xu's generation proposes avoids the unloading that adds in process of the test, it is prone to test in common lab.Apparatus of the present invention are i.e. to be designed based on double-K fracture criterion.
Double-K fracture criterion describes the fracture property of concrete by initial fracture toughness, equivalent fracture toughness, and energy to failure is also the important parameter describing fracture propagation energy expenditure simultaneously.And when computationally stating three, need accurate load-crackle mouth opening displacement (CMOD) curve and load-deflection curves, this just precision to experimental test instrument have the highest requirement.In view of this, need badly at present from design a kind of device facilitate, the fracture characteristics of test concrete economic, accurate.
Summary of the invention
It is an object of the invention to provide a kind of three point bending test device testing concrete fracture performance, with the problem solving to propose in above-mentioned background technology.
For achieving the above object, the present invention provides following technical scheme:
A kind of three point bending test device testing concrete fracture performance, this device includes that tester base, testing machine cushion cap, two support columns, servo-pressing machine, two spiral pieces, pressure plate, pillar pressure transducer, single-point load bearing, two moveable hinge bearings, two wedge shape edges of a knife, clip tens(i)ometer, deck, pad and two displacement transducers.Wherein, the bottom of tester base is fixed on smooth firm ground；Testing machine cushion cap is connected with tester base top；Two support columns are arranged at both sides, tester base top；Servo-pressing machine is connected with support column；Spiral pieces is located at servo-pressing machine both sides, and is connected with support column；Pressure plate is arranged at the bottom of servo-pressing machine；Pillar pressure transducer is connected with the bottom of pressure plate；Single-point loads bearing and is connected with the inductive probe of pillar pressure transducer；Deck is located at testing machine cushion cap end face；Moveable hinge bearing is located between deck two side bayonet slot, and is fixed on deck base plate；Concrete test block is placed on moveable hinge bearing；Pad is arranged at concrete test block end face center line position；Two wedge shape edges of a knife are arranged at both sides, bottom surface, concrete test block prefabricated crack；The tip of clip tens(i)ometer is fixed between two wedge shape edges of a knife；Being fixed on testing machine cushion cap both sides bottom two displacement transducers, when testing, displacement sensor probe is affixed with pressure plate.
Described testing machine cushion cap can be by the height of regulation of hydraulic system testing machine cushion cap.
Described pillar pressure transducer is fixed on pressure plate bottom surface by smearing construction structure glue bottom pressure plate, and pillar pressure transducer inductive probe surface is smooth convex spherical, and convex spherical is provided with ring-type raised line.
Described single-point loads bearing end face and arranges smooth concave spherical surface, and embedded annular recess on concave spherical surface, is loaded the concave surface annular recess of bearing and the convex-shaped raised line phase build-in of pillar pressure transducer by single-point, makes single-point load bearing and is fixed on pillar pressure transducer.
Described deck is divided into draw-in groove and base plate two parts, and before and after draw-in groove, face is with the scale steel ruler that thickness is 2mm, and steel rule mark central authorities graduation mark, and remaining both sides scale is symmetrical；Base plate is interval with screw.
Described moveable hinge bearing is that inverted T-shaped slides between the draw-in groove of deck, and the outer surface of moveable hinge bearing is provided with mark line, can be with the steel ruler scale phase comparison of card rooved face；The inverted T-shaped wing plate of moveable hinge bearing is provided with screw, can be connected moveable hinge bearing with fixing with deck base plate by fixed screw.
The said two wedge shape edge of a knife (13) is used building structure glue to be fixed on the bottom surface of concrete test block (11), and the prefabricated edge of crack of the outward flange of two wedge shape edges of a knife (13) and concrete test block (11) aligns.
Described pillar pressure transducer, clip tens(i)ometer are all connected with the test instrunment transmitting data with displacement transducer.
As the further scheme of the present invention: concrete test block is replaced with rock test block or cement-base composite material test block to carry out the fracture property experimental study of other material.
As the further scheme of the present invention: single-point is loaded bearing and replaces with 2 loading bearings to carry out four-point bending test.
Compared with existing apparatus, the invention has the beneficial effects as follows: a kind of three point bending test machine simple in construction testing concrete fracture performance disclosed by the invention, cost is relatively low, and can be formed by the transformation of concrete anti-compression testing machine；Support position is adjustable, can carry out three point bending test for various sizes of concrete sample；Pressure transducer, clip tens(i)ometer, displacement transducer equal independent acquisition data, DATA REASONING precision is high；Single-point loads bearing and detachably replaces with two point loading bearing, carries out 4 camber beams tests, a tractor serves several purposes.
Accompanying drawing explanation
Fig. 1 is the device schematic diagram of the three point bending test of the test concrete fracture performance of the present invention；
Fig. 2 is the loading section schematic diagram of the three point bending test device of the test concrete fracture performance of the present invention；
Fig. 3 is the 1-1 schematic cross-section of Fig. 2；
Fig. 4 is the structural representation of the moveable hinge bearing of the present invention, and wherein (a) is front view, and (b) is side view；
Fig. 5 is the structural representation of the wedge shape edge of a knife of the present invention；
Fig. 6 is the device schematic diagram of the four-point bending test of the test concrete fracture performance of the present invention；
Fig. 7 is the loading section schematic diagram of the four-point bending test device of the test concrete fracture performance of the present invention；
In figure: 1-tester base；2-testing machine cushion cap；3-support column；4-servo-pressing machine；5-spiral pieces；6-pressure plate；7-pillar pressure transducer；8-single-point loads bearing；9-deck；10-pad；11-concrete test block (containing prefabricated crack)；12-moveable hinge bearing；The 13-wedge shape edge of a knife；14-clip tens(i)ometer；15-fixed screw；16-displacement transducer, 17-two point loads bearing.
Detailed description of the invention
In conjunction with accompanying drawing and example, the present invention is described in further detail.
As shown in Fig. 1～5, in the embodiment of the present invention, a kind of three point bending test device testing concrete fracture performance, this device includes that tester base 1,2, two support columns 3 of testing machine cushion cap, 4, two spiral pieces 5 of servo-pressing machine, pressure plate 6, pillar pressure transducer 7, single-point load bearing 8, deck 9, pad 12, two wedge shape edges of a knife 13 of 10, two moveable hinge bearings, 14, two displacement transducers 16 of clip tens(i)ometer.Wherein, the bottom of tester base 1 is fixed on smooth firm ground；Testing machine cushion cap 2 is connected with tester base 1 top；Two support columns 3 are arranged at both sides, tester base 1 top；Servo-pressing machine 4 is connected with support column 3；Spiral pieces 5 is located at servo-pressing machine 4 both sides, and is connected with support column 3；Pressure plate 6 is arranged at the bottom of servo-pressing machine 4；Pillar pressure transducer 7 is connected with the bottom of pressure plate 6；Single-point loads bearing 8 and is connected with the inductive probe of pillar pressure transducer 7；Deck 9 is located at testing machine cushion cap 2 end face；Moveable hinge bearing 12 is located between 9 liang of side bayonet slots of deck, and is fixed on deck 9 base plate by fixed screw 15；Concrete test block 11 is placed on moveable hinge bearing 12；Pad 10 is arranged at concrete test block 11 end face center line position；Two wedge shape edges of a knife 13 are arranged at both sides, bottom surface, concrete test block 11 prefabricated crack；The tip of clip tens(i)ometer 14 is fixed between two wedge shape edges of a knife 15；Being fixed on testing machine cushion cap both sides bottom two displacement transducers 16, when testing, displacement transducer 16 probe is affixed with pressure plate.
As shown in figs. 6-7, present invention additionally comprises replaceable single-point and load the two point loading bearing 17 of bearing 8.
The operating process of the present invention is as follows:
(1) according to carry out fracture property test containing prefabricated cracked concrete test block 11 specification, adjust the position of moveable hinge bearing 12 according to deck 9 card rooved face steel ruler after, by fixed screw 15, the base plate of moveable hinge bearing 12 with deck 9 is fixed；
(2) construction structure glue is smeared to fix two wedge shape edges of a knife 13 in the bottom surface at concrete test block 11, and makes the outward flange of two wedge shape edges of a knife 13 align with the prefabricated edge of crack of concrete test block 11；End face center line at concrete test block 11 pastes pad 10；
(3) concrete test block 11 is positioned on the moveable hinge bearing 12 mixing up also fixed position, the tip of clip tens(i)ometer 14 is fixed between two wedge shape edges of a knife 15, servo-pressing machine arranges suitable rate, moved downward by spiral pieces 5, contact until the backing plate 10 of concrete test block 11 end face loads bearing 8 with single-point；
(4) proceeding by test, in process of the test, pillar pressure transducer 7, clip tens(i)ometer 14 are all connected with the test instrunment transmitting data with displacement transducer 16, and test instrunment Real-time Collection also preserves measured data until concrete test block 11 destroys.
Claims (8)
1. the three point bending test device testing concrete fracture performance, it is characterised in that: this device includes that tester base (1), testing machine cushion cap (2), two support columns (3), servo-pressing machine (4), two spiral pieces (5), pressure plate (6), pillar pressure transducer (7), single-point load bearing (8), deck (9), pad (10), two moveable hinge bearings (12), two wedge shape edges of a knife (13), clip tens(i)ometer (14) and two displacement transducers (16)；Wherein, the bottom of tester base (1) is fixed on smooth firm ground；Testing machine cushion cap (2) is connected with tester base (1) top；Two support columns (3) are arranged at tester base (1) both sides, top；Servo-pressing machine (4) is connected with support column (3)；Spiral pieces (5) is located at servo-pressing machine (4) both sides, and is connected with support column (3)；Pressure plate (6) is arranged at the bottom of servo-pressing machine (4)；Pillar pressure transducer (7) is connected with the bottom of pressure plate (6)；Single-point loads bearing (8) and is connected with the inductive probe of pillar pressure transducer (7)；Deck (9) is located at testing machine cushion cap (2) end face；Moveable hinge bearing (12) is located between deck (9) two side bayonet slot, and is fixed on deck (9) base plate；Concrete test block (11) is placed on moveable hinge bearing (12)；Pad (10) is arranged at concrete test block (11) end face center line position；Two wedge shape edges of a knife (13) are arranged at both sides, prefabricated crack, concrete test block (11) bottom surface；The tip of clip tens(i)ometer (14) is fixed between two wedge shape edges of a knife (13)；Testing machine cushion cap both sides are fixed in two displacement transducer (16) bottoms, and when testing, displacement transducer (16) probe is affixed with pressure plate.
The three point bending test device of test concrete fracture performance the most according to claim 1, it is characterised in that: described testing machine cushion cap can be by the height of regulation of hydraulic system testing machine cushion cap.
The three point bending test device of test concrete fracture performance the most according to claim 1, it is characterized in that, described pillar pressure transducer is fixed on pressure plate bottom surface by smearing construction structure glue bottom pressure plate, pillar pressure transducer inductive probe surface is smooth convex spherical, and convex spherical is provided with ring-type raised line.
A kind of three point bending test device testing concrete fracture performance the most according to claim 1, it is characterized in that, described single-point loads bearing end face and arranges smooth concave spherical surface, and embedded annular recess on concave spherical surface, loaded the concave surface annular recess of bearing and the convex-shaped raised line phase build-in of pillar pressure transducer by single-point, make single-point load bearing and be fixed on pillar pressure transducer.
A kind of three point bending test device testing concrete fracture performance the most according to claim 1, it is characterized in that, described deck is divided into draw-in groove and base plate two parts, and before and after draw-in groove, face is with the scale steel ruler that thickness is 2mm, and steel rule mark central authorities graduation mark, remaining both sides scale is symmetrical；Base plate is interval with screw.
A kind of three point bending test device testing concrete fracture performance the most according to claim 1, it is characterized in that, described moveable hinge bearing is that inverted T-shaped slides between the draw-in groove of deck, and the outer surface of moveable hinge bearing is provided with mark line, can be with the steel ruler scale phase comparison of card rooved face；The inverted T-shaped wing plate of moveable hinge bearing is provided with screw, can be connected moveable hinge bearing with fixing with deck base plate by fixed screw.
A kind of three point bending test device testing concrete fracture performance the most according to claim 1, it is characterized in that, the said two wedge shape edge of a knife (13) is used building structure glue to be fixed on the bottom surface of concrete test block (11), and the prefabricated edge of crack of the outward flange of two wedge shape edges of a knife (13) and concrete test block (11) aligns.
A kind of three point bending test device testing concrete fracture performance the most according to claim 1, it is characterised in that described pillar pressure transducer, clip tens(i)ometer are all connected with the test instrunment transmitting data with displacement transducer.
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| CN201620270340.0U CN205656080U (en) | 2016-03-29 | 2016-03-29 | Three -point bending test device of test concrete breaking property ability |
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Cited By (13)
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| CN107238526A (en) * | 2017-06-08 | 2017-10-10 | 安徽理工大学 | It is a kind of to reduce the device for causing prefabricated Fracture Deformation by concrete shrinkage |
| 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 |
| CN107966343A (en) * | 2017-11-30 | 2018-04-27 | 沈阳工业大学 | For PVA fibre bundles and the Collapsible mould of cement-based material adhesion test |
| CN108303321A (en) * | 2018-02-28 | 2018-07-20 | 大连理工大学 | A kind of rock mechanical property experiment device and its experimental method under water environment |
| CN109100240A (en) * | 2018-09-27 | 2018-12-28 | 贵州大学 | A kind of room is built with girder steel flexural strength testing machine |
| CN109507041A (en) * | 2018-10-18 | 2019-03-22 | 上海宝冶集团南京建筑有限公司 | A kind of I-II mixed mode fracture property test method of concrete |
| CN109975118A (en) * | 2019-04-03 | 2019-07-05 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of test method for surveying fracture energy of concrete based on four_point bending beam |
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| CN110470548A (en) * | 2019-09-17 | 2019-11-19 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Can ice bending strength measuring device and its application method |
| CN110987791A (en) * | 2019-11-28 | 2020-04-10 | 重庆大学 | System and test method for determining normal bonding parameters of steel plate and concrete |
| CN112161879A (en) * | 2020-09-19 | 2021-01-01 | 太原理工大学 | Device and method for measuring three-point bending fracture toughness of static semicircular disc in warm-pressing environment |
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- 2016-03-29 CN CN201620270340.0U patent/CN205656080U/en not_active Expired - Fee Related
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| CN107238526A (en) * | 2017-06-08 | 2017-10-10 | 安徽理工大学 | It is a kind of to reduce the device for causing prefabricated Fracture Deformation by concrete shrinkage |
| CN107238526B (en) * | 2017-06-08 | 2023-03-24 | 安徽理工大学 | Device for reducing deformation of precast cracks caused by concrete shrinkage |
| 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 |
| CN107966343A (en) * | 2017-11-30 | 2018-04-27 | 沈阳工业大学 | For PVA fibre bundles and the Collapsible mould of cement-based material adhesion test |
| CN107966343B (en) * | 2017-11-30 | 2023-11-07 | 沈阳工业大学 | Detachable die for PVA fiber bundle and cement-based material adhesion test |
| CN108303321A (en) * | 2018-02-28 | 2018-07-20 | 大连理工大学 | A kind of rock mechanical property experiment device and its experimental method under water environment |
| CN109100240A (en) * | 2018-09-27 | 2018-12-28 | 贵州大学 | A kind of room is built with girder steel flexural strength testing machine |
| CN109507041B (en) * | 2018-10-18 | 2021-05-18 | 上海宝冶集团南京建筑有限公司 | Concrete I-II composite crack fracture performance testing method |
| CN109507041A (en) * | 2018-10-18 | 2019-03-22 | 上海宝冶集团南京建筑有限公司 | A kind of I-II mixed mode fracture property test method of concrete |
| CN109975118A (en) * | 2019-04-03 | 2019-07-05 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of test method for surveying fracture energy of concrete based on four_point bending beam |
| CN110006573A (en) * | 2019-04-28 | 2019-07-12 | 杭州元创新型材料科技有限公司 | A kind of the single-point anchor force experimental rig and test method of heat insulating decorative plate installation fastener |
| CN110470548A (en) * | 2019-09-17 | 2019-11-19 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Can ice bending strength measuring device and its application method |
| CN110987791A (en) * | 2019-11-28 | 2020-04-10 | 重庆大学 | System and test method for determining normal bonding parameters of steel plate and concrete |
| CN112161879A (en) * | 2020-09-19 | 2021-01-01 | 太原理工大学 | Device and method for measuring three-point bending fracture toughness of static semicircular disc in warm-pressing environment |
| CN112664608A (en) * | 2020-12-30 | 2021-04-16 | 普德光伏技术（苏州）有限公司 | Equipment for testing photovoltaic module wet freezing test |
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