CN103018115A - Device for testing shear strength of joint of external prestressing prefabrication and assembly concrete member - Google Patents
Device for testing shear strength of joint of external prestressing prefabrication and assembly concrete member Download PDFInfo
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- CN103018115A CN103018115A CN2012105075433A CN201210507543A CN103018115A CN 103018115 A CN103018115 A CN 103018115A CN 2012105075433 A CN2012105075433 A CN 2012105075433A CN 201210507543 A CN201210507543 A CN 201210507543A CN 103018115 A CN103018115 A CN 103018115A
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Abstract
The invention discloses a device for testing shear strength of a joint of an external prestressing prefabrication and assembly concrete member. The device disclosed by the invention is characterized in that a first segment of the concrete member is arranged on a support, a hydraulic jack is loaded on the upper end face of a second segment of the concrete member; the cross section of the first segment of the concrete member is of an L shape, the cross section of the second segment of the concrete member is of an inverted L shape, the first segment of the concrete member and the second segment of the concrete member are assembled into a vertical joint, an upper horizontal plane joint and a lower horizontal plant joint by virtue of a post-tensioning prestressing tension device, the upper horizontal plane joint and the lower horizontal plane joint are respectively connected with at least one vertically arranged displacement sensor in a bridging manner, and the vertical joint is connected with one group of displacement sensors horizontally arranged in a bridging manner; and the center connecting line of the support and the hydraulic jack is coincided with that of the vertical joint. The device disclosed by the invention has the advantages that the bending moment of a loaded concrete member can be avoided, pure shear loading is realized, the displacement sensors are arranged at the joint, double control on loading is carried out by virtue of a force and displacements, and the loading failure time can be timely known, so that the device disclosed by the invention has certain safety.
Description
Technical field
The present invention relates to a kind of concrete component seam shear strength test device, relate in particular to a kind of precast assembly concrete component seam shear strength test device.
Background technology
When bridge spanning the sea, cross-line bridge and industry and covil construction structure construction, often run into that construction space is narrow and small, the construction period is short and the demanding engineering project of construction quality, common cast-in-place concrete structure is difficult to satisfy this construction requirement, so the construction of precast assembly concrete component is arisen at the historic moment.
The construction of precast assembly concrete component is transferred to prefabricated factory to most of site operation work, replace the artificial construction with mechanized construction, then installation is carried out at the scene that is transported to, the temporary projects such as Site Template have been reduced, be conducive to accelerating construction progress, improve construction quality, reduce construction risk, so the precast assembly concrete component is constructed into one of developing direction for bridge and building structure construction.
The construction of precast assembly concrete component is to exist Construction Joint with the maximum difference of cast-in-place construction, the former causes cracking easily under the load actions such as vehicle, earthquake, post-tensioned prestressing precast assembly concrete component is by applying precompression to member, greatly having delayed the cracking of seam, is the seam connected mode of at present main precast assembly concrete component.
In post-tensioned prestressing precast assembly concrete component, because shearing is larger near vehicle or seismic loading underbeam fulcrum or in the pier stud, so the shearing strength of seam is one of important design objective.Present existing method for designing generally adopts the free beam loading mode to carry out shear strength test, near seam, the precast assembly concrete component is carried out pressure-loaded, the problem that this loading mode exists is to have simultaneously shearing and moment of flexure on the joint face, not that real pure shear loads, the shearing loading efficiency is not high, and is not easy to control the size of actual shearing power.
Summary of the invention
Technical matters to be solved by this invention provides a kind of pure shear loading, shearing loading efficiency height and is easy to control the precast assembly concrete component seam shear strength test device of actual shearing power size.
The present invention solves the problems of the technologies described above the technical scheme that adopts:
A kind of precast assembly concrete component seam shear strength test device, comprise and load pedestal, be arranged on and load bearing, the precast assembly member on the pedestal and be carried in hydraulic jack on the precast assembly member, described precast assembly member is arranged on the described bearing, described precast assembly member comprises the first sections member and the second sections member, described the first sections member is arranged on the described bearing, and described hydraulic jack is carried on the upper surface of described the second sections member; Described the first sections element cross-section is L-type, described the second sections element cross-section is inverted L shape, described the first sections member and described the second sections member form vertical joint, upper horizontal plane seam and lower horizontal plane seam by the assembly unit of post-tensioned prestressing charger, cross-over connection has at least one vertical first displacement transducer that arranges on the described upper horizontal plane seam, cross-over connection has at least one vertical second displacement sensor that arranges on the described lower horizontal plane seam, and cross-over connection has one group of horizontally disposed displacement transducer on the described vertical joint; The line of centres of described bearing and described hydraulic jack and the central lines of described vertical joint.
Described post-tensioned prestressing charger comprises presstressed reinforcing steel and prestressed stretch-draw lifting jack, described presstressed reinforcing steel passes described the first sections member and described the second sections member successively, described prestressed stretch-draw lifting jack symmetry is arranged on two of described presstressed reinforcing steel, and described two prestressed stretch-draw lifting jack are carried in respectively on described the first sections member and the second sections member.
One of described horizontally disposed displacement transducer terminates on described the first sections member, the other end of described horizontally disposed displacement transducer is connected on described the second sections member, and the line at described horizontally disposed displacement transducer two ends is vertical with the center line of described vertical joint.
One of the first displacement transducer of described vertical setting terminates on described the first sections member, the other end of the first displacement transducer of described vertical setting is connected on described the second sections member, and the line at the two ends of the first displacement transducer of described vertical setting is vertical with the center line of described upper horizontal plane seam; One of the second displacement sensor of described vertical setting terminates on described the first sections member, the other end of the second displacement sensor of described vertical setting is connected on described the second sections member, and the line at the two ends of the second displacement sensor of described vertical setting is vertical with the center line of described lower horizontal plane seam.
The inside surface that the first sections member of described formation vertical joint is relative with the second sections member is the plane.
Described vertical joint is the stem grafting seam.
Described vertical joint is wet seam.
The inside surface that the first sections member of described formation vertical joint is relative with the second sections member is provided with shear connector on being.
Described vertical joint is the stem grafting seam.
Described vertical joint is wet seam.
When test loads, the hydraulic jack that is arranged on the second sections member upper surface applies vertical force on the second sections member, by the L-type sections vertical force is delivered on the vertical joint between the first sections member and the second sections member, and the central lines of the center line of hydraulic jack and vertical joint center line, therefore the vertical force active position and the vertical joint central lines that apply of hydraulic jack, so the shearing in the vertical joint is the vertical force that hydraulic jack applies, the moment of flexure of vertical joint is zero, thereby the pure shear that realizes the precast assembly concrete component loads.
Compared with prior art, the invention has the advantages that: this device can avoid occurring moment of flexure in being loaded member, the realization pure shear loads, simultaneously at seam crossing displacement transducer is set, carry out two-way control so that load by power and displacement, can in time grasp experiment and load time to rupture, have certain security.
Description of drawings
Fig. 1 is the structural representation of conventional precast assembly concrete component seam shear strength test device;
Fig. 2 is the structural representation of the embodiment of the invention one;
Fig. 3 is the structural representation of the embodiment of the invention two;
Fig. 4 is the structural representation of the embodiment of the invention three;
Fig. 5 is the structural representation of the embodiment of the invention four.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:
Embodiment one: as shown in Figure 2, a kind of precast assembly concrete component seam shear strength test device, comprise and load pedestal 1, be arranged on the bearing 2 that loads on the pedestal 1, precast assembly member and the hydraulic jack 5 that is arranged on the precast assembly member, this precast assembly member is arranged on the bearing 2, this precast assembly member comprises the first sections member 3 and the second sections member 4, wherein, the first sections member 3 is arranged on the bearing 2, hydraulic jack 5 is arranged on the upper surface of the second sections member 4, applies vertical shearing power by 5 pairs of precast assembly members of hydraulic jack; The xsect of the first sections member 3 is L-type, the xsect of the second sections member 4 is inverted L shape, the first sections member 3 and the second sections member 4 form vertical joint 6, upper horizontal plane seam 10 and lower horizontal plane seam 11 by the pre-stress stretching device assembly unit, cross-over connection has at least one vertical first displacement transducer 9 that arranges on the upper horizontal plane seam 10, cross-over connection has at least one vertical second displacement sensor 13 that arranges on the lower horizontal plane seam 11, and cross-over connection has one group of horizontally disposed displacement transducer 12 on the vertical joint 6; Bearing 2 and the line of centres of hydraulic jack 5 and the central lines of vertical joint 6.
In this specific embodiment, pre-stress stretching device comprises presstressed reinforcing steel 7 and prestressed stretch-draw lifting jack 8, presstressed reinforcing steel 7 passes the first sections member 3 and the second sections member 4 successively, prestressed stretch-draw lifting jack 8 is symmetricly set on two of presstressed reinforcing steel 7, and two prestressed stretch-draw lifting jack 8 are carried in respectively on the first sections member 3 and the second sections member 4.
In this specific embodiment, one of horizontally disposed displacement transducer 12 terminates on the first sections member 3, the other end of horizontally disposed displacement transducer 12 is connected on the second sections member 4, and the line at the two ends of this horizontally disposed displacement transducer 12 is vertical with the center line of vertical joint 6.
In this specific embodiment, one of vertical the first displacement transducer 9 that arranges terminates on the first sections member 3, the other end of vertical the first displacement transducer 9 that arranges is connected on the second sections member 4, and the line at the two ends of vertical the first displacement transducer 9 that arranges is vertical with the center line of upper horizontal plane seam 10; One of the vertical second displacement sensor 13 that arranges terminates on the first sections member 3, the other end of the vertical second displacement sensor 13 that arranges is connected on the second sections member 4, and the line at the two ends of the vertical second displacement sensor 13 that arranges is vertical with the center line of lower horizontal plane seam 11.
In this specific embodiment, the inside surface that the first sections member 3 that forms vertical joint 6 is relative with the second sections member 4 is the plane.
In this specific embodiment, vertical joint 6 is the stem grafting seam.
Embodiment two: other parts are identical with embodiment one, and the inside surface that the first sections member 3 that its difference is to form vertical joint is relative with the second sections member 4 is provided with shear connector on being, as shown in Figure 3.
Embodiment three: other parts are identical with embodiment one, and its difference is that vertical joint 6 is wet seam, as shown in Figure 4, wherein should be perfused with concrete or mortar or epoxy glue in the wet seam.
Embodiment four: other parts are identical with embodiment two, and its difference is that vertical joint 6 is the wet seam with shear connector, as shown in Figure 5, wherein should be perfused with concrete or mortar or epoxy glue in the wet seam.
Claims (10)
1. precast assembly concrete component seam shear strength test device, comprise and load pedestal, be arranged on and load bearing, the precast assembly member on the pedestal and be carried in hydraulic jack on the precast assembly member, described precast assembly member is arranged on the described bearing, described precast assembly member comprises the first sections member and the second sections member, it is characterized in that described the first sections member is arranged on the described bearing, described hydraulic jack is carried on the upper surface of described the second sections member; Described the first sections element cross-section is L-type, described the second sections element cross-section is inverted L shape, described the first sections member and described the second sections member form vertical joint, upper horizontal plane seam and lower horizontal plane seam by the assembly unit of post-tensioned prestressing tensioning equipment, cross-over connection has at least one vertical first displacement transducer that arranges on the described upper horizontal plane seam, cross-over connection has at least one vertical second displacement sensor that arranges on the described lower horizontal plane seam, and cross-over connection has one group of horizontally disposed displacement transducer on the described vertical joint; The line of centres of described bearing and described hydraulic jack and the central lines of described vertical joint.
2. a kind of precast assembly concrete component seam shear strength test device as claimed in claim 1, it is characterized in that described post-tensioned prestressing tensioning equipment comprises presstressed reinforcing steel and prestressed stretch-draw lifting jack, described presstressed reinforcing steel passes described the first sections member and described the second sections member successively, described prestressed stretch-draw lifting jack symmetry is arranged on two of described presstressed reinforcing steel, and described two prestressed stretch-draw lifting jack are carried in respectively on described the first sections member and the second sections member.
3. a kind of precast assembly concrete component seam shear strength test device as claimed in claim 1, it is characterized in that one of described horizontally disposed displacement transducer terminates on described the first sections member, the other end of described horizontally disposed displacement transducer is connected on described the second sections member, and the line at described horizontally disposed displacement transducer two ends is vertical with the center line of described vertical joint.
4. a kind of precast assembly concrete component seam shear strength test device as claimed in claim 1, one the terminating on described the first sections member of the first displacement transducer that it is characterized in that described vertical setting, the other end of the first displacement transducer of described vertical setting is connected on described the second sections member, and the line at the two ends of the first displacement transducer of described vertical setting is vertical with the center line of described upper horizontal plane seam; One of the second displacement sensor of described vertical setting terminates on described the first sections member, the other end of the second displacement sensor of described vertical setting is connected on described the second sections member, and the line at the two ends of the second displacement sensor of described vertical setting is vertical with the center line of described lower horizontal plane seam.
5. a kind of precast assembly concrete component seam shear strength test device as claimed in claim 1 is characterized in that the first sections member inside surface relative with the second sections member of described formation vertical joint is the plane.
6. a kind of precast assembly concrete component seam shear strength test device as claimed in claim 5 is characterized in that described vertical joint is the stem grafting seam.
7. a kind of precast assembly concrete component seam shear strength test device as claimed in claim 5 is characterized in that described vertical joint is wet seam.
8. a kind of precast assembly concrete component seam shear strength test device as claimed in claim 1 is characterized in that being provided with shear connector on the first sections member of described formation vertical joint inside surface relative with the second sections member.
9. a kind of precast assembly concrete component seam shear strength test device as claimed in claim 8 is characterized in that described vertical joint is the stem grafting seam.
10. a kind of precast assembly concrete component seam shear strength test device as claimed in claim 8 is characterized in that described vertical joint is wet seam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105075433A CN103018115A (en) | 2012-11-29 | 2012-11-29 | Device for testing shear strength of joint of external prestressing prefabrication and assembly concrete member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105075433A CN103018115A (en) | 2012-11-29 | 2012-11-29 | Device for testing shear strength of joint of external prestressing prefabrication and assembly concrete member |
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| CN103018115A true CN103018115A (en) | 2013-04-03 |
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| CN2012105075433A Pending CN103018115A (en) | 2012-11-29 | 2012-11-29 | Device for testing shear strength of joint of external prestressing prefabrication and assembly concrete member |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259111A (en) * | 2015-10-30 | 2016-01-20 | 黄河水利委员会黄河水利科学研究院 | Pure-shearing experimental device for new and old concrete bonding interfaces |
| CN107036909A (en) * | 2017-04-12 | 2017-08-11 | 中国地质大学（武汉） | A kind of ring shear test instrument suitable for vertical shearing face |
| CN108917551A (en) * | 2018-07-02 | 2018-11-30 | 沈阳建筑大学 | A kind of curvature measurement device and measurement method for prestressed high-strength concrete pile |
| CN110044728A (en) * | 2019-04-09 | 2019-07-23 | 上海大学 | A kind of external prestressing precast assembly concrete component seam shear strength test device |
| CN111024480A (en) * | 2019-12-31 | 2020-04-17 | 华中科技大学 | Model for simulating concrete stress state and test method |
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| JPH0210130A (en) * | 1988-06-29 | 1990-01-12 | Shimizu Corp | Method and instrument for measuring concrete shearing strength |
| CN201304683Y (en) * | 2008-11-13 | 2009-09-09 | 中铁二局股份有限公司 | Casting beam pedestal device of pre-tension pre-stressed concrete beam |
| CN102426143A (en) * | 2011-09-22 | 2012-04-25 | 中国建筑科学研究院 | Method and device for detecting compressive strength of concrete by shearing resistance method |
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2012
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| JPH0210130A (en) * | 1988-06-29 | 1990-01-12 | Shimizu Corp | Method and instrument for measuring concrete shearing strength |
| CN201304683Y (en) * | 2008-11-13 | 2009-09-09 | 中铁二局股份有限公司 | Casting beam pedestal device of pre-tension pre-stressed concrete beam |
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| ORAL BUYUKOZTURK ET AL.: "Shear behavior of joints in precast concrete segmental bridges", 《JOURNAL OF STRUCTURE ENGINEERING》, vol. 116, no. 12, 31 December 1990 (1990-12-31), pages 3380 - 3401 * |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259111A (en) * | 2015-10-30 | 2016-01-20 | 黄河水利委员会黄河水利科学研究院 | Pure-shearing experimental device for new and old concrete bonding interfaces |
| CN105259111B (en) * | 2015-10-30 | 2019-11-29 | 黄河水利委员会黄河水利科学研究院 | Linking new and old concrete interface pure shear experimental provision |
| CN107036909A (en) * | 2017-04-12 | 2017-08-11 | 中国地质大学（武汉） | A kind of ring shear test instrument suitable for vertical shearing face |
| CN107036909B (en) * | 2017-04-12 | 2018-07-06 | 中国地质大学（武汉） | A kind of ring shear test instrument suitable for vertical shearing face |
| CN108917551A (en) * | 2018-07-02 | 2018-11-30 | 沈阳建筑大学 | A kind of curvature measurement device and measurement method for prestressed high-strength concrete pile |
| CN110044728A (en) * | 2019-04-09 | 2019-07-23 | 上海大学 | A kind of external prestressing precast assembly concrete component seam shear strength test device |
| CN111024480A (en) * | 2019-12-31 | 2020-04-17 | 华中科技大学 | Model for simulating concrete stress state and test method |
| CN111024480B (en) * | 2019-12-31 | 2022-04-01 | 华中科技大学 | Model for simulating concrete stress state and test method |
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Application publication date: 20130403 |