CN105092393A - Torsion test device and method for concrete shear creep - Google Patents
Torsion test device and method for concrete shear creep Download PDFInfo
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- CN105092393A CN105092393A CN201510574169.2A CN201510574169A CN105092393A CN 105092393 A CN105092393 A CN 105092393A CN 201510574169 A CN201510574169 A CN 201510574169A CN 105092393 A CN105092393 A CN 105092393A
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Abstract
The invention discloses a torsion test device and method for concrete shear creep. The torsion test device comprises a concrete base, wherein a cylinder-shaped concrete round bar is vertically arranged in the center of the concrete base through pouring, and a support steel frame is mounted on the concrete base. At present, the beam type load is generally adopted for testing the shear action of concrete, while the invention provides the method for testing the shear creep by applying torsion effect to a concrete round pillar. According to the device, a steel wire bundle is adopted for applying two pairs of concentrated forces to the periphery of cylinder-shaped concrete with the bottom end solidified to the ground, so that the torsion shear effect is formed. A steel bracket loaded with a concrete block is hung on end of the steel wire bundle for forming load, the support steel frame with the bottom end solidified to the ground is adopted for forming a steering device for supporting the system and the steel wire bundle, a displacement meter is adopted for measuring the displacement of spacer bars on the concrete round pillar, and thus the shear creep of the concrete is calculated.
Description
[technical field]
The invention belongs to concrete creep test technical field, relate to torsion proving installation and method of testing that a kind of concrete shearing creeps.
[background technology]
Normally obtain based on the experimental study under simple stress condition about the Creep Coefficient in concrete creep theory at present, some creep models based on extensively research and test are before as B3 model, CEB-FIP model, the ACI-209R model fairly comprehensive consideration many factors such as concrete strength, cement type, relative humidity, but the stress condition of its test is axial compression stress state, the B4 model of up-to-date proposition creep that part is consistent with B3 model still adopts axial stress state, just perfect factor of shrinking consideration.And about creep test research concrete under shear action seldom.The time deformation only supposing under various internal force can be taken a unified Creep Coefficient approx and be obtained, and namely supposes that the Creep Coefficient under shear action is identical with the Creep Coefficient under axial force or flecition.And the displacement of creeping that research produces under finding shear action be can not ignore, needing creeps to concrete shearing carries out independent test.
[summary of the invention]
The object of the invention is to the shortcoming overcoming above-mentioned prior art, the torsion proving installation providing a kind of concrete shearing to creep and method of testing, this device makes concrete shearing creep effects can quantize to consider, to solve in current engineering because the mechanism problem of TERM DEFORMATION that causes of shear creep, for the prediction of xoncrete structure distortion and calculating provide reference.
For achieving the above object, the present invention is achieved by the following technical solutions:
The torsion proving installation that concrete shearing is crept, comprises concrete bed, and the cylindrical concrete round bar vertically arranged is built at concrete bed center, and concrete bed is provided with supporting steel frame; Concrete round bar top is provided with power transmission reinforcing bar, load bracket intermediate openings, and is set in from top to bottom on concrete round bar, and is lifted on supporting steel frame by steel strand wires; Steel strand wires one end is connected with load bracket, and the other end is connected on power transmission reinforcing bar.
The present invention further improves and is:
Described supporting steel frame is bolted on concrete bed.
The top of described supporting steel frame is provided with and turns to steel tank, and steel strand wires are connected on power transmission reinforcing bar after turning to steel tank.
Described power transmission reinforcing bar is the reinforcing bar that two right-angled intersections are arranged in concrete round bar, and the side of concrete round bar is stretched out at the two ends of two reinforcing bars respectively.
The below of described power transmission reinforcing bar is provided with spacer bar, by change in displacement and then the reckoning shear creep of displacement meter measurement and positioning reinforcing bar.
The invention also discloses the torsion test method that a kind of concrete shearing is crept, comprise the following steps:
1) on concrete bed, build cylindrical concrete round bar, concrete round bar height is L, and section radius is r;
2) supporting steel frame and load bracket are seated, and displacement meter is installed;
3) load application, is placed on load bracket by concrete load block;
4) just displacement l (t is read
0), then initial shear strain is
5) displacement l (t, the t of the spacer bar of t is obtained by header long-term acquisition data
0), then the shear strain of t component is
6) shear creep coefficient φ
sc(t, t
0) describe, then have
Compared with prior art, the present invention has following beneficial effect:
The load that the present invention is produced by the concrete block that the supporting steel frame transmission that bolt is cemented on concrete bed is loaded on steel bracket by steel tendon and bottom, and be cemented in bottom on the concrete cylindrical on concrete bed and form torsional shear effect, the mode of the spacer bar displacement be positioned on concrete cylindrical by clock gauge test is gathered to be reversed the distortion produced and calculates shear creep.Compared to the test of traditional beam type shearing test, this proving installation only has torsional shear effect, without the impact of other factors such as moment of flexure, can test accurately concrete shear creep.
[accompanying drawing explanation]
Fig. 1 is the structural representation of concrete round bar of the present invention and concrete bed;
Fig. 2 is the structural representation of supporting steel frame of the present invention;
Fig. 3 is the structural representation of load bracket of the present invention;
Fig. 4 is the position view of power transmission reinforcing bar of the present invention and spacer bar;
Fig. 5 is one-piece construction schematic diagram of the present invention.
Wherein: 1 is concrete bed; 2 is concrete round bar; 3 is supporting steel frame; 4 is bolt; 5 is load bracket; 6 is power transmission reinforcing bar; 7 is spacer bar; 8 is steel strand wires; 9 for turning to steel tank.
[embodiment]
Below in conjunction with accompanying drawing, the present invention is described in further detail:
See Fig. 1 to Fig. 5, the torsion proving installation that concrete shearing of the present invention is crept, comprises concrete bed 1, and the cylindrical concrete round bar 2 vertically arranged is built at concrete bed 1 center, concrete bed 1 is provided with supporting steel frame 3; Concrete round bar 2 top is provided with power transmission reinforcing bar 6, load bracket 5 intermediate openings, and is set in from top to bottom on concrete round bar 2, and is lifted on supporting steel frame 3 by steel strand wires 8; Steel strand wires one end is connected with load bracket 5, and the other end is connected on power transmission reinforcing bar 6.Supporting steel frame 3 is fixed on concrete bed 1 by bolt 4.The top of supporting steel frame 3 is provided with and turns to steel tank 9, and steel strand wires 8 are connected on power transmission reinforcing bar 6 after turning to steel tank 9.Power transmission reinforcing bar 6 is the reinforcing bar that two right-angled intersections are arranged in concrete round bar 2, and the side of concrete round bar 2 is stretched out at the two ends of two reinforcing bars respectively.The below of power transmission reinforcing bar 6 is provided with spacer bar 7, by change in displacement and then the reckoning shear creep of displacement meter measurement and positioning reinforcing bar 7.
Shear creep proving installation involved in the present invention is cemented in the concrete cylindrical on concrete bed by lower end, lower end is cemented in the supporting steel frame on concrete bed by bolt, steel bracket, steel tendon, clock gauge, and concrete loading blocks forms.Shear creep component is as right cylinder concrete round bar 2 in Fig. 1, it is consolidated in when building making on concrete bed 1, supporting steel frame 3 in Fig. 2 is by high-strength bolt 4 and concrete bed 1 consolidation, the steel strand wires 8 of the power transmission reinforcing bar 6 connected in the diagram by one end for the load bracket 5 loading load block in Fig. 3 are hung in supporting steel frame 3, the Action of Gravity Field of load block is converted to the moment of torsion acted on test component by the steering-effecting of supporting steel frame, thus pure shear effect is formed to right cylinder concrete circular bar, by change in displacement and then the reckoning shear creep of spacer bar 7 in displacement meter survey sheet 4.
The object of the invention is by the shear strain of the medium straight concrete cylindrical of long-term observation shear test under pure shear, thus calculates shear creep computation schema, for Bridge Design provides the theoretical reference considering shear action.Concrete method of testing is as follows:
1, build concrete component shown in Fig. 1, equivalent round bar height is L, and section radius is r.
2, Fig. 2 supporting steel frame and Fig. 3 load bracket are seated in order.
3, displacement meter is installed, the displacement of measurement and positioning reinforcing bar.
4, load application, is placed in concrete load block on load bracket.
5, just displacement l (t is read
0), then initial shear strain is
6, displacement l (t, the t of the spacer bar of t is obtained by header long-term acquisition data
0), then the shear strain of t component is
7, shear creep coefficient φ
sc(t, t
0) describe, then have
Above content is only and technological thought of the present invention is described; protection scope of the present invention can not be limited with this; every technological thought proposed according to the present invention, any change that technical scheme basis is done, within the protection domain all falling into claims of the present invention.
Claims (6)
1. the concrete shearing torsion proving installation of creeping, it is characterized in that, comprise concrete bed (1), the cylindrical concrete round bar (2) vertically arranged is built at concrete bed (1) center, concrete bed (1) is provided with supporting steel frame (3); Concrete round bar (2) top is provided with power transmission reinforcing bar (6), load bracket (5) intermediate openings, and be set on concrete round bar (2), and be lifted on supporting steel frame (3) by steel strand wires (8) from top to bottom; Steel strand wires one end is connected with load bracket (5), and the other end is connected on power transmission reinforcing bar (6).
2. the concrete shearing according to claim 1 torsion proving installation of creeping, it is characterized in that, described supporting steel frame (3) is fixed on concrete bed (1) by bolt (4).
3. the concrete shearing according to claim 1 torsion proving installation of creeping, it is characterized in that, the top of described supporting steel frame (3) is provided with and turns to steel tank (9), and steel strand wires (8) are connected on power transmission reinforcing bar (6) after turning to steel tank (9).
4. the concrete shearing according to claim 1 torsion proving installation of creeping, it is characterized in that, described power transmission reinforcing bar (6) is the reinforcing bar that two right-angled intersections are arranged in concrete round bar (2), and the side of concrete round bar (2) is stretched out at the two ends of two reinforcing bars respectively.
5. the concrete shearing according to claim 4 torsion proving installation of creeping, it is characterized in that, the below of described power transmission reinforcing bar (6) is provided with spacer bar (7), by change in displacement and then the reckoning shear creep of displacement meter measurement and positioning reinforcing bar (7).
6. a method of testing for the torsion proving installation adopting concrete shearing described in claim 1-5 any one to creep, is characterized in that, comprise the following steps:
1) on concrete bed, build cylindrical concrete round bar, concrete round bar height is L, and section radius is r;
2) supporting steel frame and load bracket are seated, and displacement meter is installed;
3) load application, is placed on load bracket by concrete load block;
4) just displacement l (t is read
0), then initial shear strain is
5) displacement l (t, the t of the spacer bar of t is obtained by header long-term acquisition data
0), then the shear strain of t component is
6) shear creep coefficient φ
sc(t, t
0) describe, then have
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510574169.2A CN105092393B (en) | 2015-09-10 | 2015-09-10 | The torsion proving installation that a kind of concrete shearing is crept and method of testing |
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|---|---|---|---|
| CN201510574169.2A CN105092393B (en) | 2015-09-10 | 2015-09-10 | The torsion proving installation that a kind of concrete shearing is crept and method of testing |
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| CN105092393A true CN105092393A (en) | 2015-11-25 |
| CN105092393B CN105092393B (en) | 2016-04-20 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4943930A (en) * | 1986-04-18 | 1990-07-24 | Radjy Farrokh F | Method and apparatus for non-destructive evaluation of concrete |
| CN101275903A (en) * | 2008-04-29 | 2008-10-01 | 东南大学 | Road surface interlayer cementing shearing strength test method |
| CN102109442A (en) * | 2010-12-21 | 2011-06-29 | 东南大学 | Fast test method of shearing resistance of bituminous mixture |
| CN103940682A (en) * | 2014-04-29 | 2014-07-23 | 长安大学 | Test device of concrete shear creep coefficient and test method thereof |
| CN204882267U (en) * | 2015-09-10 | 2015-12-16 | 长安大学 | Testing arrangement that twists reverse who creeps is cuted to concrete |
-
2015
- 2015-09-10 CN CN201510574169.2A patent/CN105092393B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4943930A (en) * | 1986-04-18 | 1990-07-24 | Radjy Farrokh F | Method and apparatus for non-destructive evaluation of concrete |
| CN101275903A (en) * | 2008-04-29 | 2008-10-01 | 东南大学 | Road surface interlayer cementing shearing strength test method |
| CN102109442A (en) * | 2010-12-21 | 2011-06-29 | 东南大学 | Fast test method of shearing resistance of bituminous mixture |
| CN103940682A (en) * | 2014-04-29 | 2014-07-23 | 长安大学 | Test device of concrete shear creep coefficient and test method thereof |
| CN204882267U (en) * | 2015-09-10 | 2015-12-16 | 长安大学 | Testing arrangement that twists reverse who creeps is cuted to concrete |
Non-Patent Citations (1)
| Title |
|---|
| 黄宏等: "《圆中空夹层钢管混凝土扭转实验研究》", 《实验力学》 * |
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| CN105092393B (en) | 2016-04-20 |
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