CN103575651A - Masonry straight joint tangential bonding strength testing instrument and testing method - Google Patents
Masonry straight joint tangential bonding strength testing instrument and testing method Download PDFInfo
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- CN103575651A CN103575651A CN201310601262.9A CN201310601262A CN103575651A CN 103575651 A CN103575651 A CN 103575651A CN 201310601262 A CN201310601262 A CN 201310601262A CN 103575651 A CN103575651 A CN 103575651A
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Abstract
The invention provides a masonry straight joint tangential bonding strength testing instrument and a testing method. The masonry straight joint tangential bonding strength testing instrument comprises a hollow pedestal and a cover plate, wherein the cover plate is arranged above the pedestal, can be connected with the pedestal and is in front-and-back sliding fit with the pedestal; a shear plate is arranged at the rear part of the pedestal and is fixedly connected with two side plates; a fixed base is arranged in front of the shear plate; an arc-shaped groove is formed in the fixed base; an arc-shaped groove is formed at the position, corresponding to the pedestal, of the cover plate; a front end panel is arranged at the front end of the cover plate and props against the upper half part at the front end of a masonry core sample; the shear plate blocks the lower half part at the rear end of the masonry core sample; a jack support and a counter force frame are arranged in the front of the pedestal; a jack is placed on the jack support; a spherical convex part matched with a concave part on the end part of a plunger rod of the jack is arranged on the front end panel of the cover plate; the concave part of the plunger rod props against the spherical convex part of the cover plate and the other end of the plunger rod props against the counter force frame.
Description
Technical field
The present invention relates to a kind of testing tool, relate in particular to a kind of masonry structure of testing along the device and method of the tangential cohesive strength of straight joint.
Background technology
Masonry structure is the common version of China, comprises brick setting, block masonry, barnacle body, and these masonries are built by laying bricks or stones with mortar and formed by blocks such as clay brick, building block, stone materials, has the feature ， China such as cost is low, good stability and extensively adopts.A feature of masonry structure be its compressive strength much larger than its tension, shearing strength, the cohesive force between mortar and bulk a little less than, the ability of opposing masonry straight joint normal tension (straight up) and tangential force (horizontal direction) is poor.Due to the Action of Gravity Field of masonry structure self, masonry straight joint does not generally have normal tension; But China belongs to earthquake prone areas, under the effect of earthquake load, the tangential force of masonry straight joint is often larger.The ability of masonry opposing straight joint tangential force be to determine by area and the tangential cohesive strength of straight joint of masonry straight joint, thereby the tangential cohesive strength of masonry straight joint becomes the important indicator of weighing Hollow Block Masonry Structure Anti-seismic ability.
In national standard < < Standard for test methods of basic mechincal properties of masonry > > GB/T 50129-2011, there is masonry along the test method of the tangential cohesive strength in straight joint cross section (shearing strength), the method is by masonry standard shearing resistance test block that build by laying bricks or stones in advance and Practical Project same material is tested to obtain, but due to the construction quality between the shearing resistance test block of masonry standard and actual masonry project, curing condition, there is some difference for human factors etc., therefore the data that record in standard can not accurately reflect masonry project actual conditions.This test is carried out loading to two straight joints simultaneously, and the failing load of a straight joint first destroying of take is research object, has certain uncertainty during detection.
In national standard < < masonry project onthe technology of site test standard > > GB/T 50315-2011, performance index about the tangential cohesive strength of masonry straight joint, there are original position simple shear method and two kinds of in-situ check and test methods of original position double shear method, are and directly on body of wall, test its shearing strength.Wherein, original position simple shear method is applicable to detect the shearing strength of various brick settings; Original position double shear method is applicable to detect the shearing strength that thickness is 240mm fired common brick and sintered porous brick setting, can not detect such brick setting of other thickness.Because top body of wall has certain pressure-acting to straight joint to be measured, while adopting above two kinds of methods to carry out in-situ test, have larger frictional resistance, this frictional resistance is larger on test result impact.Two kinds of methods all can not detect the tangential cohesive strength of masonry of the other types such as block masonry, barnacle body.
Chinese invention patent " shear strength tester and shearing test method " (patent No.: ZL2010 1 0107968.6), be when xoncrete structure adopts the high-strength lath of shallow-layer build-in or surface to paste high-strength lath in Reinforcement of Engineering Structure transformation project, detect instrumentation and the method for bond shear strength between lath and former xoncrete structure.
Chinese utility model patent " structure glue shearing resistance cohesive strength proving installation and method between reinforcement material and concrete " (patent No.: ZL 2,012 2 0639361.7), in concrete structure reinforcement transformation, the device and method of its shearing resistance cohesive strength of test when structure glue bonding and reinforcement material and concrete substrate.
Chinese invention patent " shearing strength at intersection stress state method of testing " (patent No.: ZL 2,010 1 0528487.2) is a kind of for evaluating the method for shearing strength between cement concrete bridge deck and asphalt mixture surfacing, can in once testing, obtain cohesive force and the angle of friction at interface simultaneously.It is the rigidity corner block of 5 ° ~ 30 ° that this method of testing arranges an angle of inclination in the direction vertical with load application, the load being vertically applied on loading specimen is converted into the power that level applies, realize applying of normal pressure in shear interface, by computing formula, obtain cohesive force and the angle of friction at interface.In the preparation of test specimen, what this invention adopted is previously prepared and the method for the standard specimen of engineering same case, but there is some difference due to construction quality, curing condition, human factor etc., therefore the data that record can not accurately reflect Practical Project situation.
Summary of the invention
In order to make up the deficiency of the tangential cohesive strength pick-up unit of masonry straight joint and method, guarantee that Hollow Block Masonry Structure Anti-seismic bearing capacity meets safety requirements, the invention provides device and the method for testing of the tangential cohesive strength test of a kind of masonry straight joint.The present invention is applicable to all kinds of masonries such as the brick setting, block masonry, barnacle body of different-thickness.
The tangential bonding strength tester of straight joint, the base that it comprises hollow be arranged at base top and can be connected with base and cover plate that front and back are slidably matched; Described base comprises the side plate that is arranged at the left and right sides and the shear plate that is arranged at rear portion, and shear plate and biside plate are fixed together; Before shear plate, be provided with holder, be provided with deep-slotted chip breaker on holder, the one end that is positioned at shear plate in deep-slotted chip breaker is provided with pressure transducer, and is connected with display; On the cover board be provided with deep-slotted chip breaker with base correspondence position, at the front end of cover plate, be provided with front console; Front console on cover plate props up the first half of masonry core front end, and the shear plate on base blocks the latter half of masonry core rear end; In the front portion of base, be provided with jacking bracket and reaction frame, jacking bracket is fixedly connected with biside plate simultaneously, reaction frame is fixedly connected with biside plate, and lifting jack is placed on jacking bracket, is provided with spherical protuberance and coordinates with the recess of lifting jack plunger rod end on the front console of cover plate; The recess of plunger rod end holds on the spherical protuberance of cover plate, and the other end props up reaction frame.
The concrete feature of this programme also has, between described base and cover plate, before and after being arranged at the guide passage on base and being arranged at the slide block realization on cover plate, be slidably matched, described guide passage, slide block are parallel with masonry core central axis, and guide passage and slide block are equal in length, to guarantee its stress equalization.
Spherical protuberance central point is positioned at cover forward end panel lower edge, guide passage and slide block and spherical protuberance be centered close to same plane, can guarantee that tangential force that lifting jack produces is by masonry core straight joint.
Cover plate and base form a space that holds masonry core by deep-slotted chip breaker; On the deep-slotted chip breaker of cover plate and base, be provided with set screw, adjust set screw, make straight joint and the guide passage of core, slide block and spherical protuberance be centered close to same plane, to bear tangential force, and can occurrence positions change in process of the test.
On side plate, be provided with position and adjust screw for adjusting the installation site of reaction frame on side plate, to test the core of different-thickness.
A kind of method of testing of using the tangential bonding strength tester of aforementioned masonry straight joint, it comprises the steps: masonry core to be measured to put into the deep-slotted chip breaker on base, masonry core rear end the latter half is held on shear plate, front console props up masonry core front end the first half, by in the guide passage on the slide block inserted base on cover plate, adjust the straight joint to be measured that set screw exposes masonry core, lifting jack plunger rod is exerted pressure to front console, base and cover plate produce the trend relatively moving along guide passage, by the shear plate and the front console that are positioned at masonry core both sides, jointly straight joint is applied to tangential force, its bonding position is destroyed, tangential force when masonry core destroys is recorded by pressure transducer, by display, is read, measure the size of destruction face, can calculate the tangential cohesive strength of straight joint of masonry core.
The beneficial effect of this programme is that the effect of guide passage and slide block is to make to produce relative sliding between cover plate and base, and eliminates the couple that the front console because of base shear plate end face outer rim and cover plate does not produce in same straight line.The effect of lifting jack is to make cover plate produce relative motion along guide passage, makes masonry core straight joint produce tangential force final destruction.The effect of display and pressure transducer is the tangential cohesive force of testing and show masonry core straight joint; Loading system of the present invention and dynamometric system, respectively in core two ends, can be eliminated the impact of friction force on test result between guide passage and slide block.Masonry core is taken from Practical Project, and testing result has represented the tangential cohesive strength of masonry straight joint.Test figure of the present invention is stable, method is reliable, is applicable to the test of the tangential cohesive strength of masonry straight joint of different-thickness.
Accompanying drawing explanation
Fig. 1 is base perspective view; Fig. 2 is the drawing in side sectional elevation at base deep-slotted chip breaker place; Fig. 3 is cover plate perspective view; Fig. 4 is cover plate longitudinal diagram; Fig. 5 is the drawing in side sectional elevation of cover plate; Fig. 6 assembling effect figure; Fig. 7 is assembling section; Fig. 8 is force analysis figure.
In figure: 1-base; 2-cover plate; 3-display; 4-pressure transducer; 5-masonry core; 6-deep-slotted chip breaker; 7-set screw; 8-guide passage; 9-shear plate; 10-slide block; 11-reaction frame; 12-jacking bracket; Screw is adjusted in 13-position; The spherical protuberance of 14-; 15-front console; 16-lifting jack; The recess of 17-lifting jack plunger rod end; 18-oil pump; 19-straight joint; 20-holder; 21-side plate.
Embodiment
As shown in Fig. 1-6, the tangential bonding strength tester of a kind of masonry straight joint, the base 1 that it comprises hollow be arranged at base 1 top and can with the cover plate 2 that base 1 is connected and front and back are slidably matched;
Described base 1 comprises the side plate 21 that is arranged at the left and right sides and the shear plate 9 that is arranged at rear portion, and shear plate 9 is fixed together with biside plate; Before shear plate 9, be provided with holder 20, be provided with deep-slotted chip breaker 6 on holder 20, the one end that is positioned at shear plate 9 in deep-slotted chip breaker 6 is provided with pressure transducer 4, and is connected with display 3; On cover plate 2, be provided with deep-slotted chip breaker 6 with base 1 correspondence position, at the front end of cover plate 2, be provided with front console 15; Front console 15 on cover plate 2 props up the first half of masonry core 5 front ends, and the shear plate 9 on base 1 blocks the latter half of masonry core 5 rear ends; In the front portion of base 1, be provided with jacking bracket 12 and reaction frame 11, jacking bracket 12 is fixedly connected with biside plate 22 simultaneously, reaction frame 11 is fixedly connected with biside plate 22, lifting jack 16 is placed on jacking bracket 12, is provided with spherical protuberance 14 and coordinates with the recess 17 of lifting jack plunger rod end on the front console 15 of cover plate 2; The recess 17 of plunger rod end holds on the spherical protuberance 14 of cover plate 2, and the other end props up reaction frame 11.Between described base 1 and cover plate 2, before and after being arranged at the guide passage 8 on base 1 and being arranged at slide block 10 realizations on cover plate 2, be slidably matched, described guide passage 8, slide block 10 are parallel with masonry core 5 central axis, guide passage 8 is equal in length with slide block 10, to guarantee its stress equalization.Spherical protuberance 14 central points are positioned at front console 15 lower edges of cover plate 2, and the same plane that is centered close to of guide passage 8 and slide block 10 and spherical protuberance 14 can guarantee that tangential force that lifting jack 16 produces is by the straight joint 19 of masonry core 5.Cover plate 2 forms a space that holds masonry core 5 with base 1 by deep-slotted chip breaker 6; On the deep-slotted chip breaker 6 of cover plate 2 and base 1, be provided with set screw 7, adjust set screw 7, make the straight joint 19 and guide passage 8 of masonry core 5, slide block 10 and spherical protuberance 14 be centered close to same plane, to bear tangential force, and can occurrence positions change in process of the test.On side plate, be provided with position and adjust screw 13 for adjusting the installation site of reaction frame 11 on side plate, to test the masonry core of different-thickness.Reaction frame 11 can be arranged on different positions and adjust in screw 13, in order to test the masonry core of different-thickness.
Under the effect of lifting jack 16, cover plate 2 produces and moves along guide passage 8 with base 1, by shear plate 9, blocks masonry core 5 rear end the latter halfs, and front console 15 props up masonry core 5 front end the first half, thereby straight joint 19 is applied to tangential force N, make it produce tangential bond damage.Tangential force when masonry core 5 destroys can be read by pressure transducer 4 and display 3.Measure the size of destruction face, can record the tangential cohesive strength of masonry straight joint.The effect of pressure transducer 4 and display 3 is tangential cohesive forces of testing and recording the straight joint of masonry core 5 19, and its measuring accuracy is 0.1kN, and has peak-value-holding function; Loading system of the present invention and dynamometric system, respectively in masonry core 5 two ends, can be eliminated the impact of slide block 10 friction force on test result.The effect of lifting jack 16 and oil pump 18 is to make cover plate 2 produce relative motion along guide passage 8, makes the straight joint 19 of masonry core 5 produce tangential force final destruction; Loading velocity is 0.2～0.4kN/s.
The effect of guide passage 8 and slide block 10 is to make cover plate 2 and 1 of base produce relative sliding, and eliminates the couple not producing in same straight line because of shear plate 9 and front console 15.
The present embodiment and embodiment 1 something in common repeat no more, and difference is that it is the method for the tangential cohesive strength of test masonry straight joint, and the tangential bonding strength tester of masonry straight joint that has utilized embodiment 1 to record.
As shown in Figure 6, a kind of method of testing of using the tangential bonding strength tester of aforementioned masonry straight joint, it comprises the steps: masonry core 5 to be measured to put into the deep-slotted chip breaker 6 on base 1, masonry core 5 rear end the latter halfs are held on shear plate 9, front console 15 props up masonry core 5 front end the first half, by in the guide passage 8 on 10 inserted bases 1 of the slide block on cover plate 2, adjust set screw 7 and expose masonry core 5 straight joint to be measured 19, lifting jack 16 plunger rods are exerted pressure to front console 15, base 1 produces along guide passage 8 trend relatively moving with cover plate 2, by the shear plate 9 and the front console 15 that are positioned at masonry core 5 both sides, jointly straight joint 19 is applied to tangential force, its bonding position is destroyed, tangential force when masonry core 5 destroys is recorded by pressure transducer 4, by display 3, is read, measure the size of destruction face, can calculate the tangential cohesive strength of straight joint 19 of masonry core 5.Masonry core 5 is taken from Practical Project, and testing result has represented the tangential cohesive strength of masonry straight joint.Test figure of the present invention is stable, and test method is reliable, is applicable to the test of the tangential cohesive strength of masonry straight joint of different-thickness.
The present embodiment 3 repeats no more with embodiment 1 something in common, and difference is that it is the method for the tangential cohesive strength of test masonry straight joint, and the tangential bonding strength tester of masonry straight joint that has utilized embodiment 1 to record.The present invention can detect the tangential cohesive strength of masonry straight joint of different-thickness.Concrete implementation step is as follows:
1. use is got core equipment and is drilled through perpendicular to masonry to be detected surface the masonry core 5 that diameter is 150mm ± 5mm, and the straight joint 19 of masonry core 5 to be measured should pass through the home position of masonry core 5.Masonry core 5 end pressure-bearing surfaces are repaired smooth and perpendicular to the straight joint of masonry core with fast hard material, and taken measures to avoid fast hard material contact straight joint.
2. the masonry core 5 of having repaired is placed in the deep-slotted chip breaker 6 of base 1, the slide block of cover plate 2 10 is penetrated in the guide passage 8 of base 1, slide cover 2, make front console 15 on cover plate 2 prop up the first half of masonry core 5 front ends, shear plate 9 on base 1 blocks the latter half of masonry core 5 rear ends, adjust set screw 7, make the outer rim of straight joint 19 in shear plate 9 and front console 15.
3. adjust the position that reaction frame 11 is installed.According to masonry core 5 thickness (masonry thickness), reaction frame 11 is arranged on to corresponding position and adjusts in screw 13.
4. lifting jack 16 is placed on jacking bracket 12, the recess 17 of lifting jack plunger rod end holds on the spherical protuberance 14 of cover plate 2, and the other end props up reaction frame 11.
5. display 3 is returned to zero, and make indicating value on peak value keeps.
6. start lifting jack 16, promote cover plate 2, make cover plate 2 and the straight joint 19 of 9 pairs of masonry cores 5 of shear plate of base 1 produce tangential force, and finally make straight joint 19 produce tangential bond damage, record maximum tangential force N now.
7. remove lifting jack 16 and cover plate 2, take out masonry core 5, measure straight joint 19 thickness of masonry core 5
land width
b.
8. calculate the tangential cohesive strength of masonry core straight joint
.
9. make some samples for every group, test respectively its tangential cohesive strength, then according to the tangential cohesive strength of the tested masonry straight joint of the parameter evaluations such as mean value, standard deviation.Thus for the checking computations of masonry Seismic Bearing Capacity provide parameter, to guarantee masonry structure safety.
stressing conditions is analyzed
As shown in Figure 8, in the present invention, lifting jack 16 pressure are delivered on building block core by cover plate 2 front consoles 15, the shear plate 9 of base 1 props up the opposite side of masonry core 5, and the normal force that the couple that shear plate 9 end faces of base 1 and the front console 15 of cover plate 2 produce in loading process can interact generation by slide block 10 and guide passage 8 is eliminated.
In the present invention because there being the friction force effect of slide block 10, the tangential force that the straight joint 19 of masonry core 5 is suffered is also not equal to the pressure of lifting jack, therefore the present invention is placed in dynamometric system the other end of masonry core 5, to record the actual tangential force being subject to of the straight joint 19 of masonry core 5.
In the present invention, masonry straight joint is only subject to tangential force effect.Increase gradually loading equipemtn pressure until straight joint produces destruction under tangential force effect, now measured tangential force N is the maximum tangential cohesive force of masonry straight joint.Measure bond damage face area A, the tangential cohesive strength f of masonry straight joint
τfor:
Local resistance to compression checking computations:
For warranty test is for tangentially to destroy along masonry straight joint, should make the local Compressive Bearing Capacity of building block be greater than the tangential cohesive force of straight joint.According to < < Code for design of masonry strucres > > GB 50003-2011, the tangential cohesive strength of masonry straight joint is about 0.11MPa～0.17MPa, and compression strength of building block is about 10MPa～20MPa.In this test, bearing area is about 120mm * 53mm, by rough sledding and do not consider the compressive strength of other mortar joint mortars, when masonry thickness is 370mm:
The tangential cohesive force of masonry straight joint is: 0.17 * 150 * 370=9435(N)
The local Compressive Bearing Capacity of building block is: 10 * 120 * 53=63600(N)
Local Compressive Bearing Capacity is much larger than the tangential cohesive force of straight joint, and checking computations meet the demands.
verification experimental verification situation
One, test figure
Adopt this device and method to test to masonry mortar.Masonry thickness is 240mm, adopts the common clay brick of MU10 while building by laying bricks or stones, and mortar strength is two kinds of M5 and M15, represents two kinds of different project situation.
Strength classes of mortar is that the masonry core detection data of M5 are as follows:
Strength classes of mortar is that the masonry core detection data of M15 are as follows:
Two, conclusion (of pressure testing)
1 stress
Than the standard shearing resistance test specimen in < < Standard for test methods of basic mechincal properties of masonry > >, during this method test, masonry mortar straight joint is subject to tangential force effect, identical with stress in Practical Project, the result of surveying more can represent engineering actual conditions; This method is only tested a default straight joint, with strong points during test, is subject to the interference of other factors little.
2 collapse states
The collapse state that this method records is that masonry mortar tangentially destroys along straight joint, close with the destruction form under geological process in engineering structure, meets engineering actual conditions.
3 detect Data Comparison
The tangential cohesive strength mean value of masonry straight joint of being built by the common clay brick of MU10, M5 mortar group that this method records is 0.24MPa; The tangential cohesive strength mean value of masonry straight joint of being built by the common clay brick of MU10, M15 mortar group is 0.42MPa, the standard value converting is thus respectively 0.19MPa and 0.32MPa, the partial safety factor of drawing materials is 1.6, design load is respectively 0.12MPa and 0.20MPa, a little more than the relevant design parameter in < < Code for design of masonry strucres > > GB 50003-2011.
4 measuring accuracies
In the formula that this method adopts, only has a variable f
τ, do not need multispecimen test figure to combine and solve, reduced error; In contrast < < Standard for test methods of basic mechincal properties of masonry > > GB/T 50129-2011, in the explanation of 5.0.1 clause, adopt the standard deviation s=0.0576N/mm of standard masonry test specimen shearing strength
2, variation factor δ=0.146, the collapse state of test specimen on the same group of test is close, and the standard deviation of test result is less than the test figure in this standard, shows that test figure is stable, method is reliable.
Claims (6)
1. the tangential bonding strength tester of masonry straight joint, the base that it comprises hollow be arranged at base top and can be connected with base and cover plate that front and back are slidably matched; Described base comprises the side plate that is arranged at the left and right sides and the shear plate that is arranged at rear portion, and shear plate and biside plate are fixed together; Before shear plate, be provided with holder, be provided with deep-slotted chip breaker on holder, the one end that is positioned at shear plate in deep-slotted chip breaker is provided with pressure transducer, and is connected with display; On the cover board be provided with deep-slotted chip breaker with base correspondence position, at the front end of cover plate, be provided with front console; Front console props up the first half of masonry core front end, and shear plate blocks the latter half of masonry core rear end; In the front portion of base, be provided with jacking bracket and reaction frame, jacking bracket is fixedly connected with biside plate simultaneously, reaction frame is fixedly connected with biside plate, and lifting jack is placed on jacking bracket, is provided with spherical protuberance and coordinates with the recess of lifting jack plunger rod end on the front console of cover plate; The recess of plunger rod end holds on the spherical protuberance of cover plate, and the other end props up reaction frame.
2. the tangential bonding strength tester of masonry straight joint according to claim 1, it is characterized in that before and after being arranged at the guide passage on base and being arranged at the slide block realization on cover plate, being slidably matched between described base and cover plate, described guide passage, slide block are parallel with masonry core central axis, guide passage and slide block are equal in length, to guarantee its stress equalization.
3. the tangential bonding strength tester of masonry straight joint according to claim 2, is characterized in that spherical protuberance central point is positioned at cover forward end panel lower edge, guide passage and slide block and spherical protuberance be centered close to same plane.
4. the tangential bonding strength tester of masonry straight joint according to claim 2, is characterized in that cover plate and base form a space that holds masonry core by deep-slotted chip breaker; On the deep-slotted chip breaker of cover plate and base, be provided with set screw, adjust set screw, make straight joint and the guide passage of core, slide block and spherical protuberance be centered close to same plane, to bear tangential force, and can occurrence positions change in process of the test.
5. the tangential bonding strength tester of masonry straight joint according to claim 1, is characterized in that being provided with position on side plate and adjusts screw for adjusting the installation site of reaction frame on side plate, to test the core of different-thickness.
6. a right to use requires the method for testing of the tangential bonding strength tester of 1 masonry straight joint, it comprises the steps: masonry core to be measured to put into the deep-slotted chip breaker on base, masonry core rear end the latter half is held on shear plate, front console props up masonry core front end the first half, by in the guide passage on the slide block inserted base on cover plate, adjust the straight joint to be measured that set screw exposes masonry core, lifting jack plunger rod is exerted pressure to front console, base and cover plate produce the trend relatively moving along guide passage, by the shear plate and the front console that are positioned at masonry core both sides, jointly straight joint is applied to tangential force, its bonding position is destroyed, tangential force when masonry core destroys is recorded by pressure transducer, by display, is read, measure the size of destruction face, can calculate the tangential cohesive strength of straight joint of masonry core.
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| CN105628609A (en) * | 2016-01-29 | 2016-06-01 | 山东大学 | Experimental device and method for measuring bonding strength and friction coefficient among building materials |
| CN105628609B (en) * | 2016-01-29 | 2019-03-01 | 山东大学 | The experimental rig and method of adhesion strength and coefficient of friction between measurement construction material |
| CN108732014A (en) * | 2018-05-18 | 2018-11-02 | 中铁九桥工程有限公司 | A kind of tetrafluoro plate pastes the detection device and detection method of shearing strength |
| CN110057653A (en) * | 2019-05-09 | 2019-07-26 | 黄明誉 | One kind is built a wall strength simulation detection method |
| CN110426294A (en) * | 2019-07-08 | 2019-11-08 | 山东省建筑科学研究院有限公司 | A kind of masonry test specimen shearing strength test device and test method |
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Application publication date: 20140212 |