CN113432850A - Bidirectional prestressed reinforced concrete equipment test device - Google Patents
Bidirectional prestressed reinforced concrete equipment test device Download PDFInfo
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- CN113432850A CN113432850A CN202110588744.XA CN202110588744A CN113432850A CN 113432850 A CN113432850 A CN 113432850A CN 202110588744 A CN202110588744 A CN 202110588744A CN 113432850 A CN113432850 A CN 113432850A
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- flange plate
- test bed
- plate
- prestressed
- horizontal
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- 238000012360 testing method Methods 0.000 title claims abstract description 77
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 18
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 70
- 239000010959 steel Substances 0.000 claims abstract description 70
- 210000002435 tendon Anatomy 0.000 claims abstract description 64
- 239000004567 concrete Substances 0.000 claims abstract description 45
- 230000007704 transition Effects 0.000 claims abstract description 20
- 230000002787 reinforcement Effects 0.000 claims description 12
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000011056 performance test Methods 0.000 abstract description 2
- 230000002929 anti-fatigue Effects 0.000 abstract 1
- 210000003205 muscle Anatomy 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a bidirectional prestressed reinforced concrete equipment test device, which comprises a concrete test bed, a foundation bearing platform and a pile foundation which are sequentially arranged from top to bottom, wherein a steel pipe is fixedly arranged on the concrete test bed, the end part of the steel pipe is fixedly connected with a flange plate, the flange plate is detachably connected with a transition connecting part, the transition connecting part is detachably connected with a fan blade, a plurality of vertical prestressed tendons and a plurality of horizontal prestressed tendons are arranged in the concrete test bed, the tensioning ends of the vertical prestressed tendons are arranged at the top of the concrete test bed, the other ends of the vertical prestressed tendons are anchored at the bottom of the foundation bearing platform, the tensioning ends of the horizontal prestressed tendons are arranged at one side of the concrete test bed where the steel pipe is arranged, and the other ends of the horizontal prestressed tendons are anchored at the other side of the concrete test bed. Compared with the prior art, the invention can effectively bear the maximum stress and the anti-fatigue bearing capacity of the fan blade and ensure reliable performance test of the fan blade.
Description
Technical Field
The invention relates to the technical field of fan blade testing devices, in particular to a bidirectional prestressed reinforced concrete equipment testing device.
Background
Wind power generation mainly drives a fan blade to rotate by means of wind power, and then the rotating speed is increased to enable a generator to output electric energy, wherein the performance of the fan blade can directly influence the conversion efficiency of wind energy and further influence the generating capacity. The fan blade is the most basic and key part in wind power generation, the good design, reliable quality and superior performance of the fan blade are the determining factors for ensuring the normal and stable operation of a unit, and because the fan blade usually needs to operate continuously in a severe environment for a long time, the fan blade usually needs to be subjected to strength and fatigue tests in advance to ensure that the fan blade has the best fatigue strength and mechanical properties, so that the fan blade can bear the test of extreme severe conditions such as storm wind and random load.
However, as the power of the fan is continuously increased and the size of the fan blade is increased, the blade testing device must bear the problems of extreme stress and fatigue caused by up-and-down vibration and left-and-right swinging in the blade testing process when blade performance testing is carried out, and once the structural design of the testing device is unreasonable, the problems that the device is damaged and the blade testing cannot be reliably carried out easily occur.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a bidirectional prestressed reinforced concrete equipment test device to effectively bear the maximum stress and the fatigue resistance bearing capacity of the fan blade and ensure reliable performance test of the fan blade.
The purpose of the invention can be realized by the following technical scheme: the utility model provides a two-way prestressed reinforcement concrete equipment test device, includes concrete test bench, basic cushion cap and pile foundation that top-down set gradually, fixed mounting has the steel pipe on the concrete test bench, the tip and the flange board fixed connection of steel pipe, flange board detachably is connected with the transition connecting portion, transition connecting portion detachably is connected with fan blade, be provided with a plurality of vertical prestressing tendons and a plurality of horizontal prestressing tendons in the concrete test bench, the tensile end setting of vertical prestressing tendon is at the top of concrete test bench, the other end anchor of vertical prestressing tendon is in the bottom of basic cushion cap, the tensile end setting of horizontal prestressing tendon is in one side of concrete test bench installation steel pipe, the other end anchor of horizontal prestressing tendon is in the opposite side of concrete test bench.
Further, the concrete test bed is arranged on an embedded steel plate, and the steel pipe is welded on the embedded steel plate.
Furthermore, a plurality of steel plate anchor bars are arranged in the concrete test bed, and one ends of the steel plate anchor bars are welded and fixed on the embedded steel plates.
Furthermore, the tensioning end of the horizontal prestressed tendon is arranged on the embedded steel plate.
Furthermore, a manhole is formed in the concrete test bed.
Further, the transitional connection portion comprises a first connecting flange plate and a second connecting flange plate, a transitional section is connected between the first connecting flange plate and the second connecting flange plate, the first connecting flange plate is connected with the flange plates through bolts, and the second connecting flange plate is connected with the fan blades through bolts.
Furthermore, the flange plate and the first connecting flange plate are respectively provided with first bolt holes corresponding to each other, and the second connecting flange plate is provided with second bolt holes corresponding to the fan blades.
Further, the second attachment flange plate is removably attached to the transition section.
Further, vertical prestressing tendons includes the vertical muscle body, the external first sleeve that is provided with of vertical muscle, first steel anchor slab and first nut are all installed at the both ends of the vertical muscle body, first steel anchor slab is provided with first anchor plate anchor bar respectively towards the both ends of first sleeve one side.
Further, horizontal prestressing tendons includes the horizontal muscle body, the horizontal muscle is provided with the second sleeve outward, second steel anchor plate and second nut are installed to horizontal muscle body one end, the both ends of second steel anchor plate orientation second sleeve one side are provided with the second anchor plate anchor bar respectively, the other end of horizontal muscle body is fixed through the second nut after passing pre-buried steel sheet.
Compared with the prior art, the invention has the following advantages:
the method comprises the steps that a plurality of vertical prestressed tendons and a plurality of horizontal prestressed tendons are arranged in a concrete test bed respectively, the tensioning ends of the vertical prestressed tendons are arranged at the top of the concrete test bed, and the other ends of the vertical prestressed tendons are anchored at the bottom of a foundation bearing platform; the tension end of the horizontal prestressed tendon is arranged on one side of the concrete test bed, which is used for connecting and installing the fan blade, and the other end of the horizontal prestressed tendon is anchored on the other side of the concrete test bed, so that a bidirectional prestressed reinforced concrete structure is realized, the whole test device can be pre-tensioned through a post-tensioning method, the fatigue resistance of the whole test device is improved, the stress of the whole test device is further clear, and the limit stress and fatigue problems caused by vertical vibration and horizontal swinging in the blade test process can be effectively born.
The invention further discloses a test device for the fan blade, which comprises a concrete test bed, a flange plate, a transition connecting part, a detachable second connecting flange plate and a second connecting flange plate, wherein the concrete test bed is provided with the embedded steel plate, the steel pipe is arranged on the embedded steel plate and is connected with the flange plate at the end part of the steel pipe, and the flange plate is connected with the fan blade to be tested through the transition connecting part, so that the connection reliability of the fan blade and the test device is ensured.
Drawings
FIG. 1 is a schematic exterior elevational view of the present invention;
FIG. 2 is an exterior side elevational view of the present invention;
FIG. 3 is a schematic diagram of the arrangement of the vertical prestressed tendons and the horizontal prestressed tendons on the side elevation in the invention;
FIG. 4 is a schematic view of the arrangement of the vertical surfaces of the horizontal prestressed tendons, the embedded steel plates and the steel plate anchor tendons in the invention;
FIG. 5 is a schematic diagram of the arrangement of vertical prestressed tendons, horizontal prestressed tendons and side elevation surfaces of steel plate anchor tendons in the invention;
FIG. 6 is a schematic view of a transition joint;
FIG. 7 is a schematic structural diagram of a vertical prestressed tendon;
FIG. 8 is a schematic top view of the vertical prestressed tendons;
FIG. 9 is a schematic structural view of a horizontal tendon;
the notation in the figure is: 1. concrete test bed, 2, basic cushion cap, 3, pile foundation, 4, pre-buried steel sheet, 5, steel pipe, 6, manhole, 7, flange board, 8, vertical prestressing tendons, 9, horizontal prestressing tendons, 10, steel sheet anchor tendon, 11, first sleeve, 110, second sleeve, 12, vertical tendon body, 13, first steel anchor slab, 130, second steel anchor slab, 14, first anchor slab anchor tendon, 140, second anchor slab anchor tendon, 15, first nut, 16 horizontal tendon body, 17, second nut, 18, changeover portion, 19, first connection flange board, 20, second connection flange board, 21, first bolt hole, 210, second bolt hole.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
As shown in fig. 1 to 5, a bidirectional prestressed reinforced concrete equipment testing device comprises a concrete test bed 1, a foundation bearing platform 2 and a pile foundation 3 which are sequentially arranged from top to bottom, wherein a steel pipe 5 is fixedly installed on the concrete test bed 1, the end part of the steel pipe 5 is fixedly connected with a flange plate 7, a plurality of vertical prestressed tendons 8 and a plurality of horizontal prestressed tendons 9 are arranged in the concrete test bed 1, the tensioning end of each vertical prestressed tendon 8 is arranged at the top of the concrete test bed 1, the other end of each vertical prestressed tendon 8 is anchored at the bottom of the foundation bearing platform 2, the tensioning end of each horizontal prestressed tendon 9 is arranged at one side of the concrete test bed 1 where the steel pipe 5 is installed, the other end of each horizontal prestressed tendon 9 is anchored at the other side of the concrete test bed 1, specifically, the concrete test bed 1 is arranged on an embedded steel plate 4, the steel pipe 5 is welded on the embedded steel plate 4, be provided with a plurality of steel sheet anchor bars 10 in the concrete test bench 1, the one end welded fastening of steel sheet anchor bar 10 is on pre-buried steel sheet 4, and consequently, the stretch-draw end of horizontal prestressing tendons 8 actually sets up on pre-buried steel sheet 4, and in addition, manhole 6 has been seted up on the concrete test bench 1 to convenient maintenance construction and maintenance.
In practical application, the flange plate 7 is detachably connected with the transition connection portion, and the transition connection portion is detachably connected with the fan blade, as shown in fig. 6, the transition connection portion includes a first connection flange plate 19 and a second connection flange plate 20, a transition section 18 is connected between the first connection flange plate 19 and the second connection flange plate 20, the first connection flange plate 19 is connected with the flange plate 7 through bolts, and the second connection flange plate 20 is connected with the fan blade through bolts. Specifically, the flange plate 7 and the first connecting flange plate 19 are respectively provided with a first bolt hole 21 corresponding to each other, and the second connecting flange plate 20 is provided with a second bolt hole 210 corresponding to the fan blade. And the second attachment flange plate 20 is designed to be removably attached to the transition section 18 to enable different fan blades to be accommodated.
As shown in fig. 7 and 8, vertical prestressed tendons 8 include the vertical muscle body 12, and the vertical muscle body 12 is provided with first sleeve 11 outward, and first steel anchor plate 13 and first nut 15 are all installed at the both ends of the vertical muscle body 12, and first steel anchor plate 13 is provided with first anchor plate anchor bar 14 respectively towards the both ends of first sleeve 11 one side, and in this embodiment, first steel anchor plate 13 is square plate structure, and first anchor plate anchor bar 14 is located four apex angle positions of square plate structure.
As shown in fig. 9, the horizontal tendon 9 includes a horizontal tendon body 16, a second sleeve 110 is disposed outside the horizontal tendon body 16, a second steel anchor plate 130 and a second nut 17 are installed at one end of the horizontal tendon body 16, second anchor plate anchors 140 are respectively disposed at two ends of the second steel anchor plate 130 facing one side of the second sleeve 110, and the other end of the horizontal tendon body 16 is fixed through the second nut 17 after passing through the embedded steel plate 4.
In practical application, firstly piling, fixing a steel reinforcement cage in the foundation bearing platform 2, a first sleeve 11 of the vertical prestressed tendon 8, a vertical tendon body 12, a first steel anchor plate 13, a first anchor plate anchor tendon 14 and a first nut 15 at the bottom, and then pouring concrete;
when the concrete test bed 1 at the upper part is poured, the flange plate 7 is welded on the large-diameter steel pipe 5, the steel plate anchor bars 10 are welded on the embedded steel plate 4, the large-diameter steel pipe 5 is welded on the embedded steel plate 4, and then the large-diameter steel pipe 5 and a reinforcement cage of the concrete test bed 1 are fixed together;
and finally, fixing the second sleeve 110 of the horizontal prestressed tendon 9, the horizontal tendon body 16, the second steel anchor plate 130 and the second anchor plate anchor tendon 140, and then pouring concrete after the second screw cap 17 at the anchoring side is installed.
And after the foundation maintenance is finished, tensioning the vertical rib bodies 12 and the horizontal rib bodies 16, and fixing nuts respectively to finish the prestress construction.
The flange plate 7, the first connecting flange plate 19 and the second connecting flange plate 20 are all provided with bolt holes, and the flange plate 7 corresponds to the first bolt holes 21 of the first connecting flange plate 19; the bolt holes 210 in the second attachment flange plate 20 correspond to the fan blades, and therefore the corresponding second attachment flange plate 20 is different for different fan blades.
In the actual test, the fan blade to be tested is only required to be connected to the second connecting flange plate 20 of the transition section 18, and the first connecting flange plate 19 of the transition section 18 is mounted on the flange plate 7, so that the test can be performed.
The bidirectional prestressed reinforced concrete equipment test device provided by the invention has the advantages of low manufacturing cost, good fatigue resistance of the prestressed structure and definite stress of the bidirectional prestressed structure, can be used for bidirectionally pre-tightening the test device by a post-tensioning method, and can effectively bear the problems of extreme stress and fatigue caused by up-down vibration and left-right swinging in the blade test process.
Claims (10)
1. A bidirectional prestressed reinforced concrete equipment test device is characterized by comprising a concrete test bed (1), a foundation bearing platform (2) and a pile foundation (3) which are sequentially arranged from top to bottom, wherein a steel pipe (5) is fixedly installed on the concrete test bed (1), the end part of the steel pipe (5) is fixedly connected with a flange plate (7), the flange plate (7) is detachably connected with a transition connecting part, the transition connecting part is detachably connected with a fan blade, a plurality of vertical prestressed tendons (8) and a plurality of horizontal prestressed tendons (9) are arranged in the concrete test bed (1), the tensioning end of each vertical prestressed tendon (8) is arranged at the top of the concrete test bed (1), the other end of each vertical prestressed tendon (8) is anchored at the bottom of the foundation bearing platform (2), the tensioning end of each horizontal prestressed tendon (9) is arranged at one side of the concrete test bed (1) where the steel pipe (5) is installed, the other end of the horizontal prestressed tendon (9) is anchored at the other side of the concrete test bed (1).
2. The apparatus for testing bidirectional prestressed reinforced concrete equipment as claimed in claim 1, wherein said concrete test bed (1) is provided with embedded steel plates (4), and said steel pipes (5) are welded on the embedded steel plates (4).
3. The device for testing the bidirectional prestressed reinforced concrete equipment according to claim 2, wherein a plurality of steel plate anchor bars (10) are arranged in the concrete test bed (1), and one ends of the steel plate anchor bars (10) are welded and fixed on the embedded steel plates (4).
4. The apparatus for testing bidirectional prestressed reinforced concrete equipment according to claim 2, characterized in that the tensile end of the horizontal prestressed tendons (9) is disposed on the embedded steel plates (4).
5. The bidirectional prestressed reinforced concrete equipment testing device according to claim 1, characterized in that a manhole (6) is opened on the concrete test bed (1).
6. The apparatus for testing bidirectional prestressed reinforced concrete equipment according to claim 1, wherein the transition connection portion comprises a first connecting flange plate (19) and a second connecting flange plate (20), a transition section (18) is connected between the first connecting flange plate (19) and the second connecting flange plate (20), the first connecting flange plate (19) is connected with the flange plate (7) through bolts, and the second connecting flange plate (20) is connected with the fan blade through bolts.
7. The apparatus for testing bidirectional prestressed reinforced concrete equipment as claimed in claim 6, wherein said flange plate (7) and said first connecting flange plate (19) are respectively provided with first bolt holes (21) corresponding to each other, and said second connecting flange plate (20) is provided with second bolt holes (210) corresponding to the fan blades.
8. A bi-directional prestressed reinforced concrete plant testing apparatus according to claim 6, characterized in that said second attachment flange plate (20) is detachably connected to the transition section (18).
9. The apparatus for testing bidirectional prestressed reinforced concrete equipment according to claim 1, wherein the vertical prestressed reinforcement (8) comprises a vertical reinforcement body (12), a first sleeve (11) is arranged outside the vertical reinforcement body (12), a first steel anchor plate (13) and a first nut (15) are mounted at both ends of the vertical reinforcement body (12), and first anchor plate anchor bars (14) are respectively arranged at both ends of one side of the first steel anchor plate (13) facing the first sleeve (11).
10. The device for testing the bidirectional prestressed reinforced concrete equipment according to claim 4, wherein the horizontal prestressed reinforcement (9) comprises a horizontal reinforcement body (16), a second sleeve (110) is arranged outside the horizontal reinforcement body (16), a second steel anchor plate (130) and a second nut (17) are installed at one end of the horizontal reinforcement body (16), second anchor plate anchors (140) are respectively arranged at two ends, facing one side of the second sleeve (110), of the second steel anchor plate (130), and the other end of the horizontal reinforcement body (16) is fixed through the second nut (17) after penetrating through the embedded steel plate (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110588744.XA CN113432850A (en) | 2021-05-28 | 2021-05-28 | Bidirectional prestressed reinforced concrete equipment test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110588744.XA CN113432850A (en) | 2021-05-28 | 2021-05-28 | Bidirectional prestressed reinforced concrete equipment test device |
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| Publication Number | Publication Date |
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| CN113432850A true CN113432850A (en) | 2021-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110588744.XA Pending CN113432850A (en) | 2021-05-28 | 2021-05-28 | Bidirectional prestressed reinforced concrete equipment test device |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0441029A1 (en) * | 1990-02-08 | 1991-08-14 | SHINKO KOSEN KOGYO KABUSHIKI KAISHA also known as SHINKO WIRE CO.LTD. | Process for making tendons for prestressed concrete structures |
| RU2271528C1 (en) * | 2004-07-09 | 2006-03-10 | Общество с ограниченной ответственностью научно-производственное предприятие "Спектр-Конверсия" | Building structure concrete strength test method, profiled groove boring device, anchoring means for building structure concrete strength test and force-applying device therefor, as well as orifice drilling jig |
| CN102519871A (en) * | 2011-11-25 | 2012-06-27 | 北京交通大学 | Method and device for measuring bonding strength between reinforcing steel and concrete under action of pre-stress |
| CN103076192A (en) * | 2012-12-24 | 2013-05-01 | 河海大学 | Portable performance test device for automatic control of combined action of bidirectional load of beam-column joint and determination method |
| CN204202977U (en) * | 2014-09-23 | 2015-03-11 | 河南省水利勘测设计研究有限公司 | A kind of prestressed stretch-draw test unit for prestressed U aqueduct |
| CN206593958U (en) * | 2017-04-10 | 2017-10-27 | 中国地震局工程力学研究所 | A kind of loading device suitable for high building structure bilateral loading |
| CN111982677A (en) * | 2020-08-03 | 2020-11-24 | 重庆大学 | Initial effective prestress field detection method for prestressed concrete frame structure |
| CN215573713U (en) * | 2021-05-28 | 2022-01-18 | 同济大学建筑设计研究院(集团)有限公司 | Bidirectional prestressed reinforced concrete equipment test device |
-
2021
- 2021-05-28 CN CN202110588744.XA patent/CN113432850A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0441029A1 (en) * | 1990-02-08 | 1991-08-14 | SHINKO KOSEN KOGYO KABUSHIKI KAISHA also known as SHINKO WIRE CO.LTD. | Process for making tendons for prestressed concrete structures |
| RU2271528C1 (en) * | 2004-07-09 | 2006-03-10 | Общество с ограниченной ответственностью научно-производственное предприятие "Спектр-Конверсия" | Building structure concrete strength test method, profiled groove boring device, anchoring means for building structure concrete strength test and force-applying device therefor, as well as orifice drilling jig |
| CN102519871A (en) * | 2011-11-25 | 2012-06-27 | 北京交通大学 | Method and device for measuring bonding strength between reinforcing steel and concrete under action of pre-stress |
| CN103076192A (en) * | 2012-12-24 | 2013-05-01 | 河海大学 | Portable performance test device for automatic control of combined action of bidirectional load of beam-column joint and determination method |
| CN204202977U (en) * | 2014-09-23 | 2015-03-11 | 河南省水利勘测设计研究有限公司 | A kind of prestressed stretch-draw test unit for prestressed U aqueduct |
| CN206593958U (en) * | 2017-04-10 | 2017-10-27 | 中国地震局工程力学研究所 | A kind of loading device suitable for high building structure bilateral loading |
| CN111982677A (en) * | 2020-08-03 | 2020-11-24 | 重庆大学 | Initial effective prestress field detection method for prestressed concrete frame structure |
| CN215573713U (en) * | 2021-05-28 | 2022-01-18 | 同济大学建筑设计研究院(集团)有限公司 | Bidirectional prestressed reinforced concrete equipment test device |
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