CN112557181B - Fixtures for Realizing Positive and Negative Stress Ratio of Four-Point Bending and Four-Point Shear Fatigue of Rock Concrete - Google Patents

Fixtures for Realizing Positive and Negative Stress Ratio of Four-Point Bending and Four-Point Shear Fatigue of Rock Concrete Download PDF

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CN112557181B
CN112557181B CN202011382190.XA CN202011382190A CN112557181B CN 112557181 B CN112557181 B CN 112557181B CN 202011382190 A CN202011382190 A CN 202011382190A CN 112557181 B CN112557181 B CN 112557181B
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positive
chuck
stress ratio
tension
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CN112557181A (en
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王志
赵军
张丽娟
高颖楠
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Zhengzhou University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/04—Chucks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0023—Bending
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0025—Shearing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0073—Fatigue
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/04—Chucks, fixtures, jaws, holders or anvils
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
    • Y02A10/23—Dune restoration or creation; Cliff stabilisation

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Abstract

本发明公开了实现岩石混凝土正负应力比四点弯曲四点剪切疲劳的夹具，包括夹头，所述夹头表面的中间固定连接有稳定杆，稳定杆的表面开设有稳定孔，稳定杆的表面固定连接有卡紧螺丝，卡紧螺丝的表面螺纹连接有第一螺母，夹头的正面开设有滑动槽，所述受压底座的表面贯穿有固定螺栓，本发明涉及夹具技术领域。该实现岩石混凝土正负应力比四点弯曲四点剪切疲劳的夹具，通过夹头表面的设置的滑动槽和移动槽，能够方便将检测装置中的受压底座和受拉底座在其表面移动，方便工作人员快速操作，因此能够在短时间对其进行调换，十分容易通过调换相关机构位置获得材料的正负剪力和正负弯矩图，操作方法简单，方便工作人员快速实现。

Figure 202011382190

The invention discloses a fixture for realizing the positive and negative stress ratio of rock concrete to four-point bending and four-point shear fatigue. The surface of the chuck is fixedly connected with a clamping screw, the surface of the clamping screw is threadedly connected with a first nut, the front of the clamp is provided with a sliding groove, and the surface of the pressure base is penetrated with a fixing bolt. The present invention relates to the technical field of clamps. The clamp that realizes the positive and negative stress ratio of rock concrete to four-point bending and four-point shear fatigue can conveniently move the compression base and tension base in the detection device on its surface through the sliding groove and the moving groove set on the surface of the chuck , which is convenient for the staff to quickly operate, so it can be replaced in a short time. It is very easy to obtain the positive and negative shear force and positive and negative bending moment diagrams of the material by changing the position of the relevant mechanism. The operation method is simple and convenient for the staff to quickly realize.

Figure 202011382190

Description

实现岩石混凝土正负应力比四点弯曲四点剪切疲劳的夹具Fixtures for Realizing Positive and Negative Stress Ratio of Four-Point Bending and Four-Point Shear Fatigue of Rock Concrete

技术领域technical field

本发明涉及夹具技术领域，具体为实现岩石、混凝土正负应力比四点弯曲、四点剪切疲劳的夹具。The invention relates to the technical field of fixtures, in particular to a fixture for realizing four-point bending and four-point shear fatigue of rock and concrete with positive and negative stress ratios.

背景技术Background technique

材料在交变弯曲应力作用下发生损伤，许多事故发生在工作应力远小于设计应力的脆断破坏，这是由于材料具有疲劳损伤特性决定的，测定材料在疲劳荷载作用下的损伤演化规律，为承受循环荷载的结构件提供数据支撑。在金属材料领域，为得到完整的S-N曲线，需要对正应力、零应力比、负应力比进行实验，且已经较为成熟。岩石混凝土类材料的受弯构件，在地震、扰动等循环荷载作用下，也会产生应力损伤，其循环荷载可能使应力比达到负数，为了研究岩石在完整应力比情况下的真实疲劳损伤特性，开展正负应力比疲劳损伤实验，具有重要的理论意义。但目前对于岩石混凝土类受弯构件，仅能实现应力比大于零的疲劳荷载施加，尚无法实现负应力比的荷载施加。The material is damaged under the action of alternating bending stress, and many accidents occur in brittle failure where the working stress is much smaller than the design stress, which is determined by the fatigue damage characteristics of the material. Structural members subject to cyclic loading provide data support. In the field of metal materials, in order to obtain a complete S-N curve, it is necessary to conduct experiments on positive stress, zero stress ratio, and negative stress ratio, and it has been relatively mature. The flexural members of rock-concrete materials will also produce stress damage under cyclic loads such as earthquakes and disturbances. The cyclic load may make the stress ratio reach a negative number. In order to study the real fatigue damage characteristics of rock under the condition of complete stress ratio, It is of great theoretical significance to carry out positive and negative stress ratio fatigue damage experiments. But at present, for rock-concrete flexural members, only the application of fatigue load with stress ratio greater than zero can be realized, and the application of load with negative stress ratio cannot be realized yet.

传统试验中的夹具将岩石和混凝土夹持后只能实现正向力的剪切或弯曲试验，传统试验夹具并非同一夹具，试验成本较高，并且岩石和混凝土在过零循环荷载作用下无法测试疲劳力学特性。The fixture in the traditional test can only realize the shear or bending test of the normal force after the rock and concrete are clamped. The traditional test fixture is not the same fixture, the test cost is high, and the rock and concrete cannot be tested under the zero-crossing cycle load Fatigue mechanical properties.

发明内容Contents of the invention

(一)解决的技术问题(1) Solved technical problems

针对现有技术的不足，本发明提供了实现岩石混凝土正负应力比四点弯曲四点剪切疲劳的夹具，解决了传统试验中的夹具将岩石和混凝土夹持后只能实现正向力的剪切或弯曲试验，传统试验夹具并非同一夹具，试验成本较高，并且岩石和混凝土在过零循环荷载作用下无法测试疲劳力学特性的问题。Aiming at the deficiencies of the prior art, the present invention provides a fixture that realizes the positive and negative stress ratio of rock concrete to four-point bending and four-point shear fatigue, which solves the problem that the fixture in the traditional test can only achieve positive force after clamping the rock and concrete For shear or bending tests, the traditional test fixtures are not the same fixture, the test cost is high, and the fatigue mechanical properties of rock and concrete cannot be tested under zero-crossing cyclic loading.

(二)技术方案(2) Technical solutions

为实现以上目的，本发明通过以下技术方案予以实现：实现岩石混凝土正负应力比四点弯曲四点剪切疲劳的夹具，包括夹头，所述夹头表面的中间固定连接有稳定杆，所述稳定杆的表面开设有稳定孔，所述稳定杆的表面固定连接有卡紧螺丝，所述卡紧螺丝的表面螺纹连接有第一螺母，所述夹头的正面开设有滑动槽，所述夹头的一侧开设有移动槽，所述移动槽的数量设置为两个，所述夹头的一侧开设有受压底座，所述受压底座的表面贯穿有固定螺栓，所述固定螺栓的表面螺纹连接有第二螺母，所述固定螺栓的一端贯穿移动槽并且延伸至移动槽的内部，所述滑动槽的表面固定连接有受拉底座。In order to achieve the above object, the present invention is achieved through the following technical proposals: the clamp that realizes the positive and negative stress ratio of rock concrete to four-point bending and four-point shear fatigue includes a chuck, and the middle of the chuck surface is fixedly connected with a stabilizing bar, so The surface of the stabilizing rod is provided with a stabilizing hole, the surface of the stabilizing rod is fixedly connected with a clamping screw, the surface of the clamping screw is threadedly connected with a first nut, and the front of the chuck is provided with a sliding groove, the One side of the chuck is provided with a moving slot, the number of the moving slots is set to two, one side of the chuck is provided with a pressure base, the surface of the pressure base is penetrated with a fixing bolt, and the fixing bolt The surface of the sliding groove is threadedly connected with a second nut, one end of the fixing bolt passes through the moving groove and extends to the inside of the moving groove, and the surface of the sliding groove is fixedly connected with a tension base.

优选的，所述受拉底座的表面固定连接有竖直长杆。Preferably, the surface of the tension base is fixedly connected with a vertical long rod.

优选的，所述竖直长杆的表面固定连接有定位螺丝。Preferably, the surface of the vertical long rod is fixedly connected with set screws.

优选的，所述定位螺丝的表面套设有受拉垫条。Preferably, the surface of the positioning screw is covered with a tension pad.

优选的，所述定位螺丝的表面螺纹连接有紧固螺栓。Preferably, the surface of the positioning screw is threaded with fastening bolts.

优选的，所述受压底座的正面开设有第一螺栓槽。Preferably, a first bolt groove is opened on the front side of the pressure base.

优选的，所述受拉垫条的侧面开设的贯穿槽。Preferably, there is a through groove opened on the side of the tension pad.

优选的，所述受拉垫条的底部固定连接有稳定板。Preferably, a stabilizing plate is fixedly connected to the bottom of the tension pad.

(三)有益效果(3) Beneficial effects

本发明提供了实现岩石混凝土正负应力比四点弯曲四点剪切疲劳的夹具。与现有技术相比，具备以下有益效果：The invention provides a clamp for realizing positive and negative stress ratio of rock concrete to four-point bending and four-point shearing fatigue. Compared with the prior art, it has the following beneficial effects:

(1)、该实现岩石混凝土正负应力比四点弯曲四点剪切疲劳的夹具，通过夹头的正面开设有滑动槽，夹头的一侧开设有移动槽，移动槽的数量设置为两个，通过夹头表面的设置的滑动槽和移动槽，能够方便将检测装置中的受压底座和受拉底座在其表面移动，方便工作人员快速操作，因此能够在短时间对其进行调换，十分容易通过调换相关机构位置获得材料的剪切力和受压力图，操作方法简单，方便工作人员快速实现。(1) The fixture that realizes the positive and negative stress ratio of rock concrete to four-point bending and four-point shear fatigue has a sliding groove on the front of the chuck, and a moving groove on one side of the chuck. The number of moving grooves is set to two One, through the sliding groove and moving groove set on the surface of the chuck, the pressure base and tension base in the detection device can be easily moved on the surface, which is convenient for the staff to quickly operate, so it can be replaced in a short time. It is very easy to obtain the shear force and pressure diagram of the material by changing the position of the relevant mechanism, the operation method is simple, and it is convenient for the staff to realize it quickly.

(2)、该实现岩石混凝土正负应力比四点弯曲四点剪切疲劳的夹具，通过滑动槽的表面固定连接有受拉底座，受拉底座的表面固定连接有竖直长杆，竖直长杆的表面固定连接有定位螺丝，定位螺丝的表面套设有受拉垫条，定位螺丝的表面螺纹连接有紧固螺栓，通过稳定杆、稳定孔、卡紧螺丝、第一螺母、定位螺丝、受拉垫条和紧固螺栓的联合设置，使得样材在放置夹紧时，能够通过旋转相关螺母，即可将样材稳定的夹持在装置之中，避免了复杂的结构导致装置操作步骤繁杂，提高了工作人员的操作效率，大大的避免了冗余操作。(2) The fixture for realizing the positive and negative stress ratio of rock concrete to four-point bending and four-point shear fatigue is fixedly connected with a tension base through the surface of the sliding groove, and the surface of the tension base is fixedly connected with a vertical long rod. The surface of the long rod is fixedly connected with a positioning screw, the surface of the positioning screw is covered with a tension pad, and the surface of the positioning screw is threaded with a fastening bolt. , The combined setting of tension pads and fastening bolts enables the sample to be stably clamped in the device by rotating the relevant nut when it is placed and clamped, avoiding the complicated structure that causes the device to operate The steps are complicated, which improves the operating efficiency of the staff and greatly avoids redundant operations.

(3)、该实现岩石混凝土正负应力比四点弯曲四点剪切疲劳的夹具，通过滑动槽的表面固定连接有受拉底座，夹头的一侧开设有受压底座，通过短小支座受压底座和长支座受拉底座的联合设置，进一步缩减了装置整体的复杂程度，通过使用较为简易的结构以实现检测功能，并且该实验中的简易结构能够快速操作，易于工作人员对其快速的维护。(3) The clamp that realizes the positive and negative stress ratio of rock concrete to four-point bending and four-point shear fatigue is fixedly connected with a tension base through the surface of the sliding groove, and a compression base is provided on one side of the clamp, and through a short support The combined setting of the compression base and the long support tension base further reduces the overall complexity of the device, and the detection function is realized by using a relatively simple structure, and the simple structure in this experiment can be quickly operated, which is easy for the staff to adjust. fast maintenance.

附图说明Description of drawings

图1为本发明结构的主视图；Fig. 1 is the front view of structure of the present invention;

图2为本发明图1中A处的局部结构放大图；Fig. 2 is the enlarged view of the local structure at A place in Fig. 1 of the present invention;

图3为本发明夹头结构的正视图；Fig. 3 is the front view of chuck structure of the present invention;

图4为本发明夹头结构的侧视图；Fig. 4 is the side view of chuck structure of the present invention;

图5为本发明夹头结构的俯视图；Fig. 5 is the top view of chuck structure of the present invention;

图6为本发明受压底座结构的正视图；Fig. 6 is a front view of the structure of the pressure base of the present invention;

图7为本发明受压底座结构的侧视图；Fig. 7 is a side view of the pressure base structure of the present invention;

图8为本发明受压底座结构的俯视图；Fig. 8 is a top view of the pressure base structure of the present invention;

图9为本发明受拉底座结构的正视图；Fig. 9 is a front view of the tension base structure of the present invention;

图10为本发明受拉底座结构的侧视图；Fig. 10 is a side view of the tension base structure of the present invention;

图11为本发明受拉底座结构的俯视图；Fig. 11 is a top view of the tension base structure of the present invention;

图12为本发明受拉垫条结构的正视图；Fig. 12 is the front view of the tension pad structure of the present invention;

图13为本发明受拉垫条结构的侧视图；Fig. 13 is a side view of the tension pad structure of the present invention;

图14为本发明受拉垫条结构的俯视图；Fig. 14 is a top view of the tension pad structure of the present invention;

图15为本发明四点剪切位置示意图。Fig. 15 is a schematic diagram of four-point shearing positions of the present invention.

图中，1、夹头；2、稳定杆；3、稳定孔；4、卡紧螺丝；5、第一螺母；6、滑动槽；7、移动槽；8、受压底座；9、固定螺栓；10、第二螺母；11、受拉底座；12、定位螺丝；13、受拉垫条；14、紧固螺栓；15、第一螺栓槽；16、竖直长杆；17、贯穿槽；18、稳定板。In the figure, 1. Chuck; 2. Stabilizing bar; 3. Stabilizing hole; 4. Clamping screw; 5. First nut; 6. Sliding groove; 7. Moving groove; 8. Pressure base; 9. Fixing bolt ; 10, the second nut; 11, the tension base; 12, the positioning screw; 13, the tension pad; 14, the fastening bolt; 15, the first bolt groove; 16, the vertical rod; 17, the through groove; 18. Stabilizing plate.

具体实施方式Detailed ways

下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

请参阅图1-15，本发明实施例提供技术方案：实现岩石混凝土正负应力比四点弯曲四点剪切疲劳的夹具，包括夹头1，夹头1表面的中间固定连接有稳定杆2，稳定杆2的表面开设有稳定孔3，稳定杆2的表面固定连接有卡紧螺丝4，卡紧螺丝4的表面螺纹连接有第一螺母5，通过夹头1表面的设置的滑动槽6和移动槽7，能够方便将检测装置中的受压底座8和受拉底座11在其表面移动，方便工作人员快速操作，因此能够在短时间对其进行调换，十分容易通过调换相关机构位置获得材料的剪力和弯矩图，操作方法简单，方便工作人员快速实现，夹头1的正面开设有滑动槽6，通过稳定杆2、稳定孔3、卡紧螺丝4、第一螺母5、定位螺丝12、受拉垫条13和紧固螺栓14的联合设置，使得样材在放置夹紧时，能够通过旋转相关螺母，即可将样材稳定的夹持在装置之中，避免了复杂的结构导致装置操作步骤繁杂，提高了工作人员的操作效率，大大的避免了冗余操作，夹头1的一侧开设有移动槽7，通过短小支座受压底座8和长支座受拉底座11的联合设置，进一步缩减了装置整体的复杂程度，通过使用较为简易的结构以实现检测功能，并且该实验中的简易结构能够快速操作，易于工作人员对其快速的维护，移动槽7的数量设置为两个，夹头1的一侧开设有受压底座8，受压底座8的表面贯穿有固定螺栓9，固定螺栓9的表面螺纹连接有第二螺母10，固定螺栓9的一端贯穿移动槽7并且延伸至移动槽7的内部，滑动槽6的表面固定连接有受拉底座11，受拉底座11的表面固定连接有竖直长杆16，竖直长杆16的表面固定连接有定位螺丝12，定位螺丝12的表面套设有受拉垫条13，定位螺丝12的表面螺纹连接有紧固螺栓14，受压底座8的正面开设有第一螺栓槽15，受拉垫条13的侧面开设的贯穿槽17，受拉垫条13的底部固定连接有稳定板18，本发明克服了传统试验中的夹具将岩石和混凝土夹持后只能实现正向力的剪切和弯曲试验的缺点，将四点弯曲和四点剪切夹具设计于同一夹具，通过调整支座位置，实现四点弯曲和四点剪切实验，同时采用特殊支座形式，实现正负弯曲和正负剪切的切换，进而实现负应力比的疲劳加载，提供了岩石和混凝土工程中受弯构件的疲劳寿命曲线的完整应力比测试方案。Please refer to Figures 1-15, the embodiment of the present invention provides a technical solution: a fixture for achieving positive and negative stress ratios of rock concrete and four-point bending and four-point shear fatigue, including a chuck 1, and the middle of the surface of the chuck 1 is fixedly connected with a stabilizing bar 2 , the surface of the stabilizing bar 2 is provided with a stabilizing hole 3, the surface of the stabilizing bar 2 is fixedly connected with a clamping screw 4, and the surface of the clamping screw 4 is threadedly connected with a first nut 5, through the sliding groove 6 provided on the surface of the chuck 1 and the moving groove 7 can conveniently move the pressure base 8 and the tension base 11 in the detection device on its surface, which is convenient for the staff to quickly operate, so it can be replaced in a short time, and it is very easy to obtain by changing the position of the relevant mechanism The shear force and bending moment diagram of the material, the operation method is simple, and it is convenient for the staff to realize quickly. There is a sliding groove 6 on the front of the chuck 1, through the stabilizing rod 2, the stabilizing hole 3, the clamping screw 4, the first nut 5, the positioning The joint setting of screws 12, tension pads 13 and fastening bolts 14 enables the sample to be stably clamped in the device by rotating the relevant nut when the sample is placed and clamped, avoiding complicated The structure makes the operation steps of the device complicated, improves the operating efficiency of the staff, and greatly avoids redundant operations. There is a moving groove 7 on one side of the chuck 1, and the compression base 8 of the short support and the tension base of the long support are provided. The combined setting of 11 further reduces the overall complexity of the device, and realizes the detection function by using a relatively simple structure, and the simple structure in this experiment can be quickly operated, and it is easy for the staff to quickly maintain it. The number of mobile tanks 7 There are two sets, one side of the chuck 1 is provided with a pressure base 8, the surface of the pressure base 8 is penetrated by a fixing bolt 9, the surface of the fixing bolt 9 is threaded with a second nut 10, and one end of the fixing bolt 9 moves through The groove 7 extends to the inside of the moving groove 7, the surface of the sliding groove 6 is fixedly connected with a tension base 11, the surface of the tension base 11 is fixedly connected with a vertical rod 16, and the surface of the vertical rod 16 is fixedly connected with a positioning Screw 12, the surface of the positioning screw 12 is covered with a tension pad 13, the surface of the positioning screw 12 is threaded with a fastening bolt 14, the front of the pressure base 8 is provided with a first bolt groove 15, the tension pad 13 The through groove 17 opened on the side, the bottom of the tension pad 13 is fixedly connected with the stabilizing plate 18, the present invention overcomes the problem that the clamp in the traditional test can only realize the shearing and bending test of the normal force after the rock and the concrete are clamped The disadvantage is that the four-point bending and four-point shearing fixtures are designed in the same fixture, and the four-point bending and four-point shearing experiments are realized by adjusting the position of the support. At the same time, the special support form is used to achieve positive and negative bending and positive and negative shearing Switching, and then realize the fatigue loading of negative stress ratio, provide a complete stress ratio test scheme for the fatigue life curve of flexural members in rock and concrete engineering.

使用时，将待检测的样材放置在受压底座8、受拉底座11和竖直长杆16之间，通过旋转第一螺母5和夹头1将样材固定，然后开启试样装置，夹头1上下移动，样材可以实现跨中截面纯受弯受力状态，测试出样材的受力分析图，将受压底座8和受拉底座11的位置调至如图15所示位置，可以实现跨中无弯矩的纯剪切受力状态，由此得出受力分析图，样材在被检测时夹持的相当稳定，并且能够获得正负拉应力和正负切应力的双重分析。During use, the sample material to be tested is placed between the pressure base 8, the tension base 11 and the vertical long rod 16, the sample material is fixed by rotating the first nut 5 and the chuck 1, and then the sample device is opened, The chuck 1 moves up and down, and the sample can realize the state of pure bending force in the mid-span section, test the force analysis diagram of the sample, and adjust the positions of the compression base 8 and the tension base 11 to the positions shown in Figure 15 , can realize the state of pure shear force without bending moment in the span, and thus obtain the force analysis diagram. Double analysis.

同时本说明书中未作详细描述的内容均属于本领域技术人员公知的现有技术。At the same time, the content not described in detail in this specification belongs to the prior art known to those skilled in the art.

需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device.

尽管已经示出和描述了本发明的实施例，对于本领域的普通技术人员而言，可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型，本发明的范围由所附权利要求及其等同物限定。Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (4)

1. Realize anchor clamps of rock concrete positive negative stress ratio four-point bending four-point shearing fatigue, including two relative and symmetrical chuck (1), its characterized in that from top to bottom: the middle of the outer surface of the chuck (1) is fixedly connected with a stabilizer bar (2), a stabilizer hole (3) is formed through the stabilizer bar (2), a clamping screw (4) is arranged on the surface of the stabilizer bar (2), a first nut (5) is connected with the surface of the clamping screw (4) in a threaded mode, a sliding groove (6) is formed in the front surface of the chuck (1), moving grooves (7) are formed in the inner side of the chuck (1), the number of the moving grooves (7) is two, a pressed base (8) is arranged in the inner side of the chuck (1), a fixing bolt (9) penetrates through the surface of the pressed base (8), a second nut (10) is connected with the surface of the fixing bolt (9) in a threaded mode, one end of the fixing bolt (9) penetrates through the moving grooves (7) and extends to the inner portion of the moving grooves (7), and a tension base (11) is fixedly connected with the surface of the sliding groove (6).
The surface of the tension base (11) is fixedly connected with a vertical long rod (16);
the surface of the vertical long rod (16) is fixedly connected with a set screw (12);
the surface of the positioning screw (12) is sleeved with a tension cushion strip (13);
the surface of the set screw (12) is in threaded connection with a fastening bolt (14).
2. The fixture for realizing four-point bending four-point shearing fatigue of rock concrete with positive and negative stress ratio according to claim 1, wherein: the front face of the pressed base (8) is provided with a first bolt groove (15).
3. The clamp for realizing four-point bending four-point shearing fatigue of rock concrete with positive and negative stress ratio according to claim 1 or 2, characterized in that: and a through groove (17) is formed in the side surface of the tension tie bar (13).
4. A clamp for achieving four-point bending four-point shear fatigue of rock concrete with positive and negative stress ratio according to claim 3, characterized in that: the bottom of the tension cushion strip (13) is fixedly connected with a stabilizing plate (18).
CN202011382190.XA 2020-12-01 2020-12-01 Fixtures for Realizing Positive and Negative Stress Ratio of Four-Point Bending and Four-Point Shear Fatigue of Rock Concrete Expired - Fee Related CN112557181B (en)

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CN202310958083.4A CN117007418A (en) 2020-12-01 2020-12-01 Fixture for both multi-point bending and shear fatigue testing

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CN116660055B (en) * 2023-06-02 2023-11-03 南京航空航天大学 Four-point bending loading test device suitable for main cargo compartment door lock hook structure

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