CN103487317A - Method for designing pulling and pressing loading head in concrete multiaxial test - Google Patents
Method for designing pulling and pressing loading head in concrete multiaxial test Download PDFInfo
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- CN103487317A CN103487317A CN201310419667.0A CN201310419667A CN103487317A CN 103487317 A CN103487317 A CN 103487317A CN 201310419667 A CN201310419667 A CN 201310419667A CN 103487317 A CN103487317 A CN 103487317A
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Abstract
The invention provides a method for designing a pulling and pressing loading head in a concrete multiaxial test, belongs to the technical field of concrete structure engineering tests, and particularly relates to the method for designing the pulling and pressing loading head in the concrete multiaxial test. A pulling loading head in the pulling and pressing loading head is combined by a bolt pull rod with a semicircular spherical hinge and a pulling loading plate with a concave type spherical hinge. A pressing loading head is of a design with a front variable cross section and a rear variable cross section. The front portion is the pressing loading head, and the rear portion is an electromagnetic attraction base. The pressing loading head is connected with the electromagnetic attraction base through an electromagnetic lock. According to the method for designing the pulling and pressing loading head, the pulling and pressing loading head can be conveniently and accurately adjusted to be centered, uniform stress is achieved, loading heads in two or three directions can be prevented from being mutually collided and intersected due to eccentricity and deflection of the pressing loading head in the loading process, and concrete multiaxial strength and deformation can be conveniently and accurately measured; and the method can be applied to the pulling and pressing loading head design in the concrete multiaxial test.
Description
Technical field
The invention belongs to concrete structure engineering experimental technique field, particularly the tension and compression loading head method for designing under a kind of concrete multi-shaft test.
Background technology
Common two-way slab, flap, housing, wallboard, shear wall and concrete filled steel tube in concrete structure engineering, and some great unique constructions, as the pressure vessel of nuclear reactor and containment, dam, ocean platform, heavy hydraulic press, equipment Foundations, television tower etc., be all typical two dimension or three-dimensional structure, its xoncrete structure is in obvious multi-axis stress state." GB50010-2011 Code for design of concrete structures ", provide two axle intensity envelope diagrams, the three axle compressive strength figure of normal concrete and be applicable to destruction (intensity) criterion of any triaxial stress state, and non-linear stress-strain (this structure) relation with the damage evolution parameter of uniaxial compression and tension, twin shaft constitutive relation etc.Because concrete is heterogeneous material, wood property is complicated and changeable, and concrete multi-shaft intensity has very big-difference with the difference of being out of shape with multi-axis stress state; Be difficult to find a kind of method of pure theory accurately, can calculate its multiaxis mechanical property from the initial conditions such as character, composition and preparation technology of concrete raw material.The most real and reasonable approach is to utilize concrete multi-shaft testing equipment, making test specimen directly to carry out test determination.
Under concrete multi-shaft tension and compression test, how to facilitate and accurately regulate tension and compression loading head centering and reach stressed even, the loading head of two or three directions how in the multiaxis loading procedure, avoiding pressing loading head that eccentric, deflection occurs and produce mutually clashes into, intersects and fight, thereby easily and accurately measure concrete multi-shaft intensity and distortion, this is the problem of needing solution badly.Therefore, want to obtain the test figure of concrete multi-shaft constitutive relation, how to realize that the tension and compression loading under its multiaxial experiment seems particularly important, at first this just needs to solve the problem in science that the tension and compression loading head under the concrete multi-shaft test designs.
Summary of the invention
The objective of the invention is to overcome the defect of prior art, invent the tension and compression loading head method for designing under a kind of concrete multi-shaft test, can facilitate and accurately regulate tension and compression loading head centering, and reach stressed even.The loading head of two or three directions avoiding pressing loading head that eccentric, deflection occurs in the multiaxis loading procedure and produce mutually clashes into, intersects and fight, thereby easily and accurately measures concrete multi-shaft intensity and distortion.
The technical solution used in the present invention is the tension and compression loading head method for designing under a kind of concrete multi-shaft test, it is characterized in that, in the tension and compression loading head draw loading head be with the bolt draw bar 1 of semicircle ball pivot with draw load plate 3 combined types designs with the concave ball pivot; Pressing loading head is front and back variable cross section designs, and anterior for pressing loading head 7, rear portion is electromagnetic attracting force base 6; Press loading head 7 to link by electromagnetic lock 8 and electromagnetic attracting force base 6;
The step of specific design method is as follows:
1) will be contained in the bolt draw bar 1 of semicircle ball pivot drawing on load plate 3 with the concave ball pivot, play the ball pivot effect of drawing loading head, draw load plate 3 to be connected with the multiaxis test specimen of 4 bolt load plate by 4 screw holes on it pre-embedded bolt or rear bonding when building with 4 again;
2) press loading head 7 to link by electromagnetic lock 8 and electromagnetic attracting force base 6; Electromagnetic lock 8 adopts the second gear design, and first grade is that light magnetic force is regulated shelves, regulates the centering of pressing loading head and test specimen; The second gear magnetic force of attaching most importance to loads shelves, and test specimen is pressed to loading procedure;
3) the pressure loading head height under concrete multi-shaft tension and compression test is greater than the height of its electromagnetic attracting force base, the center of electromagnetic lock center in the electromagnetic attracting force base, and by squared design, the 1/2-3/4 that the electromagnetism line is its length of side.
Beneficial effect of the present invention is: the tension and compression loading head method for designing under the concrete multi-shaft test, can facilitate and accurately regulate tension and compression loading head centering and reach stressed even, and can avoid in loading procedure pressing loading head that eccentric, deflection occurs and the loading head of two or three directions producing mutually clashes into, intersects and fight, thereby easily and accurately measure concrete multi-shaft intensity and distortion; Can be applicable to the tension and compression loading head design under the concrete multi-shaft test.
The accompanying drawing explanation
Fig. 1 is the bolt draw bar figure with the semicircle ball pivot, and Fig. 2 is for drawing the load plate front view (FV), and Fig. 3 is for pressing loading head and electromagnetic attracting force base figure, and Fig. 4 is electromagnetic lock structure figure.In figure: 1-is with the bolt draw bar of semicircle ball pivot; 2-semicircle ball pivot; 3-draws load plate; 4-concave ball pivot hole; 5-load plate screw hole; 6-electromagnetic attracting force base; 7-presses loading head; The 8-electromagnetic lock.
Embodiment
Describe specific embodiment of the invention in detail below in conjunction with accompanying drawing and technical scheme, the described loading head method for designing of drawing is connected with drawing load plate 3 for the semi-round ball fraising of the bolt draw bar 1 with semicircle ball pivot 2 by semicircle ball pivot 2 and load plate, and draw load plate 3 to be connected by screw hole 5, nut and the three axle test specimens with bolt again, form drawing under triaxial stress state and load stressed system; Described pressure loading head method for designing is for pressing loading head 7 to be connected with pressing loading head electromagnetic force base 6 by electromagnetic lock 8, and the pressure formed under triaxial stress state loads stressed system.
Concrete implementation step and flow process are: before carrying out the concrete multi-shaft mechanical property test, the multiaxis test specimen with bolt is arranged on and draws on load plate 3 by nut, then carry out prestretching and carry, pretension is 1KN; After this, the ballast head of other two axles or an axle, by Hydrauservo System, pressurize and carry out the pressure loading surface near the multiaxis test specimen, distance between the two, between 1-2mm, is transferred to first grade to electromagnetic lock 8, regulate press loading head and test specimen to medium; After, then electromagnetic lock 8 is transferred to second gear, and carrying out pre-ballast, precompression is 5KN, carries out concrete multi-shaft tension and compression test in test design ratio and parameter afterwards.During load test, at first adopt the polishing machine that the mortar bed of concrete test block adhesive surface is polished off, during the machine polishing, must guarantee that two adhesive surfaces are parallel, can not deflection, till getting to and exposing coarse aggregate.During multiaxis tension load test, the construction structure glue that bonding modulates on the concrete in tension test cube of having polished, form the construction structure glue tack coat, and load plate is put on the construction structure glue tack coat.
Tension and compression loading head method for designing under this concrete multi-shaft test, stressed even, each centering is regulated accurately and is convenient, during load test, easy for installation, construction structure glue and the antifriction material of bonding use are cheap, can easily and accurately measure concrete multi-shaft intensity and distortion, can be applicable in concrete multi-shaft tension and compression test.
Claims (1)
1. the lower tension and compression loading head method for designing of concrete multi-shaft test, is characterized in that, in the tension and compression loading head to draw loading head be bolt draw bar (1) with semicircle ball pivot with the concave ball pivot, draw the design of load plate (3) combined type; Pressing loading head is front and back variable cross section designs, and anterior for pressing loading head (7), rear portion is electromagnetic attracting force base (6); Press loading head (7) to link by electromagnetic lock (8) and electromagnetic attracting force base (6); The step of specific design method is as follows:
1) will be contained in the bolt draw bar (1) of semicircle ball pivot (2) with concave ball pivot (4) draw load plate (3) upper, draw load plate (3) to be connected by 4 the load plate screw holes (5) on it pre-embedded bolt or multiaxis test specimen of boning afterwards with 4 bolt load plate when building with 4 again;
2) press loading head (7) to link by electromagnetic lock (8) and electromagnetic attracting force base (6); Electromagnetic lock (8) adopts the second gear design, and first grade is that light magnetic force is regulated shelves, regulates the centering of pressing loading head and test specimen; The second gear magnetic force of attaching most importance to loads shelves, and test specimen is pressed to loading;
3) the pressure loading head height under concrete multi-shaft tension and compression test is greater than the height of its electromagnetic attracting force base (6), the center of electromagnetic lock (8) center in electromagnetic attracting force base 6, and by squared design, the 1/2-3/4 that the electromagnetism line is its length of side.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310419667.0A CN103487317B (en) | 2013-09-13 | 2013-09-13 | Method for designing pulling and pressing loading head in concrete multiaxial test |
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| CN201310419667.0A CN103487317B (en) | 2013-09-13 | 2013-09-13 | Method for designing pulling and pressing loading head in concrete multiaxial test |
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| CN103487317A true CN103487317A (en) | 2014-01-01 |
| CN103487317B CN103487317B (en) | 2015-07-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398031A (en) * | 2020-03-19 | 2020-07-10 | 中国地震局地质研究所 | Modularization press convenient to reorganize by oneself |
Citations (4)
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|---|---|---|---|---|
| CN2284391Y (en) * | 1997-01-08 | 1998-06-17 | 武汉水利电力大学 | Tension performance auxiliary energy absorption device for normal material tester |
| CN201903483U (en) * | 2010-11-24 | 2011-07-20 | 大连民族学院 | Loading testing device for concrete sample with two shafts pulled and one shaft pressed |
| CN102288485A (en) * | 2011-05-12 | 2011-12-21 | 河海大学 | Large-sized fully graded concrete axial-tension tester |
| CN103234825A (en) * | 2013-04-12 | 2013-08-07 | 长安大学 | Pavement material direct tensile test apparatus with eccentric tension avoided and method thereof |
-
2013
- 2013-09-13 CN CN201310419667.0A patent/CN103487317B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2284391Y (en) * | 1997-01-08 | 1998-06-17 | 武汉水利电力大学 | Tension performance auxiliary energy absorption device for normal material tester |
| CN201903483U (en) * | 2010-11-24 | 2011-07-20 | 大连民族学院 | Loading testing device for concrete sample with two shafts pulled and one shaft pressed |
| CN102288485A (en) * | 2011-05-12 | 2011-12-21 | 河海大学 | Large-sized fully graded concrete axial-tension tester |
| CN103234825A (en) * | 2013-04-12 | 2013-08-07 | 长安大学 | Pavement material direct tensile test apparatus with eccentric tension avoided and method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 何振军 等: "高强高性能混凝土多轴拉压力学性能", 《工程力学》 * |
| 宋玉普 等: "高强高性能混凝土在多轴压下强度与变形性能的试验研究", 《岩石力学与工程学报》 * |
| 王旭虹 等: "混凝土多轴性能试验装置", 《河海大学学报（自然科学版）》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398031A (en) * | 2020-03-19 | 2020-07-10 | 中国地震局地质研究所 | Modularization press convenient to reorganize by oneself |
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