CN207816740U - A kind of experimental provision for studying FRP- concrete interface adhesive properties - Google Patents
A kind of experimental provision for studying FRP- concrete interface adhesive properties Download PDFInfo
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Abstract
Description
技术领域technical field
本实用新型涉及FRP加固混凝土结构领域，尤其适用于FRP与混凝土界面的单剪和正拉性能试验。The utility model relates to the field of FRP-reinforced concrete structures, and is especially suitable for single-shear and normal-tension performance tests of the interface between FRP and concrete.
背景技术Background technique
随着社会的发展，越来越多的混凝土结构进入到了老龄化时期，大量的混凝土结构面临着各种外部荷载作用以及耐久性损伤，如地震、风载、碳化、冻融循环、氯盐侵蚀、干湿循环、高温紫外线辐射等，导致了混凝土结构的实际使用寿命远远低于设计年限，为此修复混凝土结构而投入了大量的人力、物力资源。With the development of society, more and more concrete structures have entered the aging period, and a large number of concrete structures are faced with various external loads and durability damage, such as earthquakes, wind loads, carbonation, freeze-thaw cycles, and chloride salt erosion , dry-wet cycle, high-temperature ultraviolet radiation, etc., have caused the actual service life of the concrete structure to be far lower than the design period, and a lot of manpower and material resources have been invested in repairing the concrete structure.
混凝土结构的常用加固方法有加大界面、粘贴板及粘贴FRP等，其中，FRP为纤维增强复合材料(Fiber Reinforced Polymer/Plastic的简称)，现有CFRP、GFRP、AFRP、BFRP等，FRP复合材料是由纤维材料与基体材料(树脂)按一定的比例混合后形成的高性能型材料，质轻而硬，不导电，机械强度高，回收利用少，耐腐蚀；FRP片材加固技术由于其加固效果好，几乎不增加额外重量的特性而得到广泛应用，但FRP片材是通过胶黏剂加固混凝土结构的，且由于FRP片材的柔韧性决定了其在加固时的主要加固方式为抗剪加固，因此对FRP与混凝土之间界面粘结的抗剪性能研究意义重大；同时在部分情况下FRP片材与混凝土粘结受正拉力的作用，为此可通过在FRP表面粘结钢块进行正拉试验获得其力学性能。Commonly used reinforcement methods for concrete structures include enlarging the interface, pasting boards and pasting FRP, among which FRP is a fiber reinforced composite material (abbreviation for Fiber Reinforced Polymer/Plastic), existing CFRP, GFRP, AFRP, BFRP, etc., FRP composite materials It is a high-performance material formed by mixing fiber material and matrix material (resin) in a certain proportion. It is light and hard, non-conductive, high mechanical strength, less recycling, and corrosion-resistant; FRP sheet reinforcement technology is due to its reinforcement The effect is good, and it is widely used because it hardly adds extra weight. However, the FRP sheet is used to strengthen the concrete structure through adhesives, and due to the flexibility of the FRP sheet, the main reinforcement method during reinforcement is shear resistance. Therefore, it is of great significance to study the shear performance of the interface bond between FRP and concrete; at the same time, in some cases, the bond between FRP sheet and concrete is subject to positive tension, so it can be carried out by bonding steel blocks on the surface of FRP. The mechanical properties were obtained by positive tension test.
通常的FRP片材与混凝土界面抗剪性能试验包括单剪实验、双剪实验、弯梁实验等，其中双剪实验由于两侧混凝土表面差别较大，易造成较大试验误差，而弯梁实验中FRP片材的受力较为复杂。单剪实验由于其直接对拉伸单面FRP片材的特性，因此可以满足试验要求，但单剪实验加载过程中试件的垂直居中要求较高，因此研发一种可以固定试件、实现垂直居中加载的试验装置十分必要。The usual shear performance tests of the FRP sheet and concrete interface include single shear experiment, double shear experiment, bending beam experiment, etc. The double shear experiment is likely to cause large test errors due to the large difference between the concrete surfaces on both sides, while the bending beam experiment The stress of medium FRP sheet is more complicated. The single shear test can meet the test requirements due to its direct stretching characteristics of single-sided FRP sheets, but the vertical centering of the specimen during the loading process of the single shear test is relatively high, so a method to fix the specimen and achieve vertical A centrally loaded test device is necessary.
公开号CN105181589A的专利中提出一种用于研究FRP-混凝土粘结界面剪切实验装置，该装置通过上下底板夹紧试件的方式进行剪切实验，但该装置具有实验初期需要人工扶稳、试件破坏时夹具容易跌落，且只能进行剪切实验的特性，因此实验的安全操作性及试验内容方面受到限制。In the patent of publication number CN105181589A, a kind of experimental device for studying the shearing of FRP-concrete bonding interface is proposed. The device performs the shearing experiment by clamping the specimen with the upper and lower bottom plates. The fixture is easy to fall when the specimen is damaged, and only the shear test can be performed, so the safety operability and test content of the experiment are limited.
发明内容Contents of the invention
本实用新型针对上述现有技术存在的问题做出改进，即本实用新型所要解决的技术问题是提供一种用于研究FRP-混凝土界面粘结性能的实验装置，不仅能够有效实现FRP-混凝土界面粘结性能的研究，而且可以固定试件，实现垂直居中加载，结构简单，操作方便。The utility model makes improvements to the problems existing in the above-mentioned prior art, that is, the technical problem to be solved by the utility model is to provide an experimental device for studying the bonding performance of the FRP-concrete interface, which can not only effectively realize the bonding performance of the FRP-concrete interface It can be used for the study of bonding performance, and can fix the test piece to realize vertical center loading. It has a simple structure and is easy to operate.
为了解决上述技术问题，本实用新型的技术方案是：用于研究FRP-混凝土界面粘结性能的实验装置包括单剪夹持板、正拉夹持板、底座连接板，单剪夹持板、正拉夹持板、底座连接板通过支撑螺杆连接，所述单剪夹持板中间开设通孔，并在单剪夹持板上设置定位件；所述正拉夹持板中间开设通孔；支撑螺杆配合设置定位螺母。In order to solve the above-mentioned technical problems, the technical solution of the present utility model is: the experimental device for studying the bonding performance of the FRP-concrete interface includes a single-shear clamping plate, a positive tension clamping plate, a base connecting plate, a single-shear clamping plate, The positive pull clamping plate and the base connecting plate are connected by a support screw, a through hole is opened in the middle of the single shear clamping plate, and a positioning piece is arranged on the single shear clamping plate; a through hole is opened in the middle of the positive pull clamping plate; The supporting screw rod cooperates to set the positioning nut.
进一步地，FRP-混凝土单剪试验过程中单剪夹持板位于正拉夹持板下方；FRP-混凝土正拉试验过程中正拉夹持板位于单剪夹持板下方。Further, during the FRP-concrete single shear test, the simple shear clamping plate is located under the positive tension clamping plate; during the FRP-concrete normal tension test, the positive tension clamping plate is located under the simple shear clamping plate.
进一步地，还包括电子万能试验机，底座连接板设置在电子万能试验机的工作台面上。Further, an electronic universal testing machine is also included, and the base connecting plate is arranged on the working table of the electronic universal testing machine.
进一步地，所述底座连接板上设置支撑螺杆定位套管，支撑螺杆定位套管内装配支撑螺杆。Further, a supporting screw positioning sleeve is provided on the base connecting plate, and a supporting screw is assembled in the supporting screw positioning sleeve.
进一步地，单剪夹持板中部开设条形孔，且条形孔的四角均进行圆形收角；正拉夹持板中部开设方形孔，且方形孔的四角均进行圆形收角；单剪夹持板、正拉夹持板、底座连接板均为钢板；支撑螺杆定位套管焊接在底座连接板上；底座连接板为两块，每一块底座连接板上设置两个支撑螺杆定位套管，支撑螺杆为四个。Further, a strip-shaped hole is set in the middle of the single-shear clamping plate, and the four corners of the strip-shaped hole are all rounded; The shearing clamping plate, positive pulling clamping plate and base connecting plate are all steel plates; the supporting screw positioning sleeve is welded on the base connecting plate; there are two base connecting plates, and two supporting screw positioning sleeves are set on each base connecting plate tube, four supporting screws.
进一步地，每个支撑螺杆上支撑下部的夹持板的定位螺母为两个，限位下部的夹持板的定位螺母为一个，支撑上部的夹持板的定位螺母为一个，限位上部的夹持板的定位螺母为一个。Further, there are two positioning nuts supporting the lower clamping plate on each support screw, one positioning nut for limiting the lower clamping plate, one positioning nut for supporting the upper clamping plate, and one positioning nut for limiting the upper clamping plate. There is one positioning nut for the clamping plate.
进一步地，单剪试验时，正拉夹持板与单剪夹持板之间设置单剪试件，单剪试件侧部粘结FRP片材。Further, during the simple shear test, a single-shear specimen is set between the positive-tension clamping plate and the single-shear clamping plate, and the side of the single-shear specimen is bonded to the FRP sheet.
进一步地，正拉试验时，单剪夹持板与正拉夹持板之间设置正拉试件，正拉试件底部粘结FRP片材，FRP片材底部设置连接件，连接件包括与正拉试件底部的FRP片材粘结的钢块，钢块螺纹连接拉伸螺杆，电子万能试验机下夹头夹紧拉伸螺杆。Further, during the positive tension test, a positive tension test piece is set between the single shear clamping plate and the positive tension clamping plate, the bottom of the positive tension test piece is bonded to the FRP sheet, and the bottom of the FRP sheet is provided with a connector. The steel block bonded to the FRP sheet at the bottom of the positive tension test piece, the steel block is threaded to connect the tension screw, and the lower chuck of the electronic universal testing machine clamps the tension screw.
与现有技术相比，本实用新型具有以下有益效果：不仅能够有效实现FRP-混凝土界面粘结性能的研究，而且可以固定试件，实现垂直居中加载，结构简单，操作方便。Compared with the prior art, the utility model has the following beneficial effects: not only can effectively realize the research on the bonding performance of the FRP-concrete interface, but also can fix the test piece, realize vertical center loading, simple structure and convenient operation.
附图说明Description of drawings
图1为本实用新型实施例的应用于FRP-混凝土单剪实验的示意图；Fig. 1 is the schematic diagram that is applied to the FRP-concrete simple shear experiment of the utility model embodiment;
图2为本实用新型实施例的应用于FRP-混凝土正拉实验的示意图；Fig. 2 is the schematic diagram that is applied to the FRP-concrete positive tension experiment of the utility model embodiment;
图3为本实用新型实施例的应用于FRP-混凝土单剪实验工作状态的示意图；Fig. 3 is the schematic diagram that is applied to FRP-concrete simple shear experiment working state of the utility model embodiment;
图4为本实用新型实施例的应用于FRP-混凝土正拉实验工作状态的示意图；Fig. 4 is the schematic diagram that is applied to the working state of FRP-concrete positive tension experiment of the utility model embodiment;
图5为本实用新型实施例的连接件的结构示意图。Fig. 5 is a structural schematic diagram of the connector of the embodiment of the present invention.
图中：1-正拉夹持板；2-单剪夹持板；3-底座连接板；4-支撑螺杆；5-定位螺母；6-定位件；7-支撑螺杆定位套管；8-单剪试件；9-正拉试件；10-电子万能试验机；11-拉伸螺杆，12-钢块，13-FRP片材。In the figure: 1- positive pull clamping plate; 2- single shear clamping plate; 3- base connecting plate; 4- supporting screw; 5- positioning nut; 6- positioning piece; 7- supporting screw positioning sleeve; 8- Single shear test piece; 9-positive tension test piece; 10-electronic universal testing machine; 11-tension screw, 12-steel block, 13-FRP sheet.
具体实施方式Detailed ways
下面结合附图和具体实施方式对本实用新型做进一步详细的说明。Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.
如图所示，用于研究FRP-混凝土界面粘结性能的实验装置包括单剪夹持板、正拉夹持板、底座连接板，单剪夹持板、正拉夹持板、底座连接板通过支撑螺杆连接，所述单剪夹持板中间开设通孔，并在单剪夹持板上设置定位件；所述正拉夹持板中间开设通孔；支撑螺杆配合设置定位螺母。As shown in the figure, the experimental device used to study the bonding performance of the FRP-concrete interface includes a single shear clamping plate, a positive tension clamping plate, a base connecting plate, a single shear clamping plate, a positive tension clamping plate, and a base connecting plate Through the connection of the support screw, a through hole is opened in the middle of the single shear clamping plate, and a positioning member is arranged on the single shear clamping plate; a through hole is opened in the middle of the positive tension clamping plate; and a positioning nut is set in cooperation with the support screw.
进一步地，FRP-混凝土单剪试验过程中单剪夹持板位于正拉夹持板下方；FRP-混凝土正拉试验过程中正拉夹持板位于单剪夹持板下方。Further, during the FRP-concrete single shear test, the simple shear clamping plate is located under the positive tension clamping plate; during the FRP-concrete normal tension test, the positive tension clamping plate is located under the simple shear clamping plate.
进一步地，还包括电子万能试验机，底座连接板设置在电子万能试验机的工作台面上。Further, an electronic universal testing machine is also included, and the base connecting plate is arranged on the working table of the electronic universal testing machine.
进一步地，所述底座连接板上设置支撑螺杆定位套管，支撑螺杆定位套管内装配支撑螺杆。Further, a supporting screw positioning sleeve is provided on the base connecting plate, and a supporting screw is assembled in the supporting screw positioning sleeve.
进一步地，单剪夹持板中部开设条形孔，且条形孔的四角均进行圆形收角；正拉夹持板中部开设方形孔，且方形孔的四角均进行圆形收角；单剪夹持板、正拉夹持板、底座连接板均为钢板；支撑螺杆定位套管焊接在底座连接板上；底座连接板为两块，每一块底座连接板上设置两个支撑螺杆定位套管，支撑螺杆为四个；定位件为定位角钢。Further, a strip-shaped hole is set in the middle of the single-shear clamping plate, and the four corners of the strip-shaped hole are all rounded; The shearing clamping plate, positive pulling clamping plate and base connecting plate are all steel plates; the supporting screw positioning sleeve is welded on the base connecting plate; there are two base connecting plates, and two supporting screw positioning sleeves are set on each base connecting plate There are four supporting screw rods; the positioning piece is a positioning angle steel.
用于研究FRP-混凝土界面粘结性能的实验装置，包括单剪夹持板、正拉夹持板、两块底座连接板、四根支撑螺杆、二十个定位螺母；单剪夹持板中部开设条形孔，四角进行圆形收角，并焊接定位件；单剪夹持板四角开孔放入支撑螺杆；正拉夹持板中部开方形孔，四角进行圆形收角；正拉夹持板四角开孔放入支撑螺杆；每个底座连接板焊接两个定位套管；每个支撑螺杆底部打磨光滑放入定位套管，刻画螺纹；定位螺母大小与支撑螺杆相互匹配；单剪试验时单剪夹持板在下，正拉夹持板在上；正拉试验时正拉夹持板在下，单剪夹持板在上。该装置可有效实现FRP-混凝土界面的单剪实验和正拉实验，为研究FRP与混凝土界面粘结性能提供条件。The experimental device used to study the bonding performance of FRP-concrete interface, including single shear clamping plate, positive tension clamping plate, two base connecting plates, four supporting screws, twenty positioning nuts; the middle part of single shear clamping plate Open a strip hole, round the four corners, and weld the positioning parts; put the support screw into the four corners of the single-shear clamping plate; open a square hole in the middle of the positive pulling clamping plate, and round the corners; The four corners of the holding plate are opened and placed into the supporting screws; each base connecting plate is welded with two positioning sleeves; the bottom of each supporting screw is polished smooth and placed in the positioning sleeve, and the thread is drawn; the size of the positioning nut matches the supporting screw; simple shear test During the test, the single-shear clamping plate is at the bottom, and the positive-tension clamping plate is at the top; during the positive-tension test, the positive-tension clamping plate is at the bottom, and the single-shear clamping plate is at the top. The device can effectively realize the simple shear test and positive tension test of the FRP-concrete interface, and provide conditions for the study of the bonding performance of the FRP-concrete interface.
定位件应满足试件大小要求；支撑螺杆总长度应与试验机相匹配，支撑螺杆直径应满足最大荷载承载力要求，支撑螺杆底部进入底座连接板套管距离应满足稳定性要求，支撑螺杆的上部螺纹长度应满足最低高度要求；底座连接板的两个套管高度、壁厚应满足稳定性要求，且应与底部板焊接牢固，底部板厚度也应满足承载力要求；螺帽应与支撑螺杆匹配，且厚度应满足承载力要求。The positioning piece should meet the size requirements of the test piece; the total length of the support screw should match the testing machine, the diameter of the support screw should meet the maximum load bearing capacity requirements, the distance from the bottom of the support screw into the base connecting plate casing should meet the stability requirements, and The length of the upper thread should meet the minimum height requirements; the height and wall thickness of the two casings of the base connecting plate should meet the stability requirements, and should be firmly welded with the bottom plate, and the thickness of the bottom plate should also meet the bearing capacity requirements; the nut should be in contact with the support The screws are matched, and the thickness should meet the bearing capacity requirements.
本实用新型装置用于FRP-混凝土单剪实验时：When the utility model device is used in the FRP-concrete single shear experiment:
准备单剪试件，单剪试件侧部粘结FRP片材；如图3所示，将两个支撑螺杆4放入底座连接板3的支撑螺杆定位套管7中，再将形成的整体抬放至电子万能试验机10工作台面上，另一侧的两个支撑螺杆4和底座连接板3采取同样的方法抬放至工作台面。根据单剪试件8尺寸，每根支撑螺杆4首先拧入两组单剪夹持板2下部定位螺母5至合适位置，放入单剪夹持板2，单剪夹持板上的定位件朝上，再拧入一组单剪夹持板2上部定位螺母5，使用水准仪保持单剪夹持板2水平。之后拧入一组正拉夹持板1下定位螺母5至合适位置，放入正拉夹持板1，再拧入一组正拉夹持板1上定位螺母5。放入单剪试件8，使试件与定位件6吻合，单剪试件侧部粘结的FRP片材与电子万能试验机10下夹头对正居中。然后将上部正拉夹持板1向下移位至单剪试件8顶部，并使用定位螺母5进行夹紧。开始实验时，电子万能试验机下夹头夹紧单剪试件侧部粘结的FRP片材并向下移动，最终试件中FRP片材与混凝土表面发生剪切剥离破坏，从而获得单剪试件极限承载力等。Prepare the single-shear test piece, and bond the FRP sheet to the side of the single-shear test piece; Lift it to the working table of the electronic universal testing machine 10, and lift the two supporting screws 4 and the base connecting plate 3 on the other side to the working table in the same way. According to the size of the single-shear test piece 8, each support screw 4 is first screwed into two sets of positioning nuts 5 at the lower part of the single-shear clamping plate 2 to a suitable position, and put into the single-shear clamping plate 2, and the positioning piece on the single-shear clamping plate Upward, screw in a set of positioning nuts 5 on the upper part of the single-shear clamping plate 2, and use a level to keep the single-shear clamping plate 2 level. Then screw in a group of positive pull clamping plate 1 lower positioning nuts 5 to a suitable position, put into positive pulling clamping plate 1, and then screw in a set of positive pulling clamping plate 1 upper positioning nuts 5. Put in the single-shear test piece 8, make the test piece coincide with the positioning piece 6, and align the FRP sheet bonded to the side of the single-shear test piece with the 10 lower chucks of the electronic universal testing machine. Then the upper positive tension clamping plate 1 is moved down to the top of the simple shear specimen 8 and clamped with the positioning nut 5 . At the beginning of the experiment, the lower chuck of the electronic universal testing machine clamped the FRP sheet bonded to the side of the single-shear specimen and moved downward. Finally, the FRP sheet and the concrete surface in the specimen were sheared and peeled off, thereby obtaining the single-shear specimen. The ultimate bearing capacity of the test piece, etc.
本实用新型装置用于FRP-混凝土正拉实验时：When the utility model device is used in the FRP-concrete positive pull test:
准备正拉试件，正拉试件底部粘结FRP片材，FRP片材底部设置连接件，连接件包括与正拉试件底部的FRP片材粘结的钢块，钢块螺纹连接拉伸螺杆；如图4所示，将两个支撑螺杆4放入底座连接板3的支撑螺杆定位套管7中，再将形成的整体抬放至电子万能试验机10工作台面上，另一侧的两个支撑螺杆4和底座连接板3采取同样的方法抬放至工作台面。根据正拉试件9尺寸，每根支撑螺杆4首先拧入两组正拉夹持板1下部定位螺母5至合适位置，放入正拉夹持板1，再拧入一组正拉夹持板1上部定位螺母5，使用水准仪保持正拉夹持板1水平。之后拧入一组单剪夹持板2下定位螺母5至合适位置，放入单剪夹持板2，单剪夹持板上的定位件朝下，再拧入一组单剪夹持板2上定位螺母5。放入正拉试件9，使正拉试件下方连接件的拉伸螺杆与电子万能试验机的下夹头对正居中。然后将上部单剪夹持板2向下移位至正拉试件9顶部，并使用定位螺母5进行夹紧。开始实验时，电子万能试验机下夹头夹紧拉伸螺杆11并向下移动，最终试件中FRP片材与混凝土表面发生正向拉伸破坏，从而获得正拉试件中FRP片材与混凝土的正向粘结强度等。Prepare the positive tension test piece, the bottom of the positive tension test piece is bonded to the FRP sheet, and the bottom of the FRP sheet is provided with a connecting piece. screw; as shown in Figure 4, put two support screws 4 into the support screw positioning sleeve 7 of the base connecting plate 3, and then lift the formed whole to the electronic universal testing machine 10 working table, the other side The two supporting screw rods 4 and the base connecting plate 3 are lifted to the work surface in the same way. According to the size of the positive tension test piece 9, each support screw 4 is first screwed into two sets of positioning nuts 5 at the lower part of the positive tension clamping plate 1 to a suitable position, put in the positive tension clamping plate 1, and then screwed into a set of positive tension clamps. Position the nut 5 on the upper part of the plate 1, and use a level to keep the clamping plate 1 horizontal. Then screw in a set of single-shear clamping plate 2 and lower positioning nut 5 to a suitable position, put in the single-shear clamping plate 2, the positioning piece on the single-shear clamping plate faces downward, and then screw in a set of single-shear clamping plate 2 Upper positioning nut 5. Put in the positive tension test piece 9, so that the tension screw of the connecting piece under the positive tension test piece is aligned with the lower chuck of the electronic universal testing machine. Then the upper simple shear clamping plate 2 is moved down to the top of the positive tension test piece 9, and clamped with the positioning nut 5. At the beginning of the experiment, the lower chuck of the electronic universal testing machine clamped the tension screw 11 and moved it downwards. Finally, the FRP sheet in the test piece and the concrete surface were damaged by positive tension, thereby obtaining the FRP sheet and the concrete surface in the positive tension test piece. The positive bond strength of concrete, etc.
以上所述仅为本实用新型的较佳实施例，凡依本实用新型申请专利范围所做的均等变化与修饰，皆应属本实用新型的涵盖范围。The above descriptions are only preferred embodiments of the present utility model, and all equivalent changes and modifications made according to the patent scope of the present utility model shall fall within the scope of the present utility model.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108088756A (en) * | 2018-01-31 | 2018-05-29 | 福州大学 | A kind of experimental provision and its application method for being used to study FRP- concrete interface adhesive properties |
| CN110455643A (en) * | 2019-07-09 | 2019-11-15 | 河海大学 | A symmetrical double-shear interface bonding test device and test method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108088756A (en) * | 2018-01-31 | 2018-05-29 | 福州大学 | A kind of experimental provision and its application method for being used to study FRP- concrete interface adhesive properties |
| CN108088756B (en) * | 2018-01-31 | 2023-09-12 | 福州大学 | An experimental device for studying the bonding performance of FRP-concrete interface and its use method |
| CN110455643A (en) * | 2019-07-09 | 2019-11-15 | 河海大学 | A symmetrical double-shear interface bonding test device and test method |
| CN110455643B (en) * | 2019-07-09 | 2020-09-22 | 河海大学 | Symmetric double-shear interface bonding test device and test method |
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