CN113218687B - Cable-stayed bridge cable-beam anchoring structure reduced scale test model loading device and test method thereof - Google Patents
Cable-stayed bridge cable-beam anchoring structure reduced scale test model loading device and test method thereof Download PDFInfo
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Abstract
The invention discloses a cable-stayed bridge cable beam anchoring structure reduced scale test model loading device and a test method thereof, wherein the device comprises a steel box beam section arranged below an electro-hydraulic servo actuator, an anchoring mechanism fixed in the steel box beam section, and an anchoring device used for fixing the steel box beam section; the anchoring mechanism is provided with two anchor backing plates and can fix two stay cables simultaneously; the anchor backing plate is arranged perpendicular to the loading direction of the electro-hydraulic servo actuator; and a force transmission steel frame is arranged between the beam of the electro-hydraulic servo actuator and the anchor backing plate. The invention simulates the cable force by matching the electro-hydraulic servo actuator with the force transmission steel frame, puts the scale test model upside down to enable the loading surface of the steel box beam section to face upwards, and designs the corresponding anchoring mechanism to realize the loading process, thereby reducing the difference between the simulated cable force and the real bridge cable force, and avoiding the problem of low test result accuracy caused by various external factors such as insufficient loading force simulation, easy careless mistakes in the test process and the like.
Description
Technical Field
The invention relates to the technical field of bridge structure equipment, in particular to a cable-stayed bridge cable-beam anchoring structure scale test model loading device and a test method thereof.
Background
In the research work of the cable-beam anchoring structure, the requirements of a test field, test equipment, operability, cost and the like are comprehensively considered, and the cable-beam anchoring structure scale test becomes a mainstream trend. And a set of model test loading system is needed for the scale test research of the cable-beam anchoring structure. The cable beam anchoring structure is mainly divided into four types in engineering: anchor box, ear plate, anchor tube, and anchor plate. At present, the anchoring structure of the domestic anchor box type cable beam mainly adopts a single-cable steel anchor box, namely, only one guide cable pipe of one steel anchor box is anchored by one guide cable pipe through one anchor backing plate. To this kind of traditional single cable steel anchor case cable beam anchoring structure, its model test then has two kinds of modes: firstly, taking a partial structure at a cable beam anchoring area as a test piece, erecting a model test piece according to the original cable direction, welding the lower end of the model test piece on a base, and directly applying thrust along the original cable direction of the cable beam anchoring structure by using a hydraulic jack to simulate the cable-stayed cable force, such as a cable beam anchoring model test of a Shanghai Yangtze river bridge; secondly, the beam body of the cable beam anchoring area is simplified into an I-shaped beam or a box beam, a vertical upright post is welded at the beam end, an inclined support is arranged at the beam end to serve as a reaction frame, a reaction wall is matched, and a simulation cable is tensioned by a jack to realize loading, such as a cable beam anchoring area test of a long bridge of Sutong Yangtze river. Both modes realize the simulation of single cable through the jack.
The cable force efficiency is greatly improved by the mode that one steel anchor box is provided with two guide cable pipes which are used for anchoring two stay cables through two anchor backing plates, and the structure is suitable for large-width and large-span highway-railway same-layer cable-stayed bridges, such as Yangtze river bridges used as Yonggang highway and railway. If the traditional jack is continuously adopted to simulate the cable force of the stayed cable to realize loading, the thrust of the jack is transferred to the anchor box by the jack distribution beam because the jack of the first method directly acts between the loading base and the jack distribution beam, and the cable force with large range needs a plurality of jacks to simultaneously act on the jack distribution beam, so that the condition of uneven distribution of the loading force can occur; the second method focuses on the simulation of the stay cable line shape, and the inclined support reaction frame and the model test piece are easy to twist under the direct tension of the jack. Therefore, the difference between the simulated cable force and the real bridge cable force is large in the traditional loading mode, and the modeling is long in time consumption and high in cost.
Disclosure of Invention
The invention aims to solve the technical problems that a cable-stayed bridge cable-girder anchoring structure scale test model loading device and a test method thereof are provided, the cable-stayed bridge cable-girder anchoring structure scale test model loading device is suitable for model test research of a double-cable steel anchor box, the problem that test results are not high in accuracy due to various external factors such as the fact that loading force simulation is not achieved, careless mistakes are easy to occur in the test process and the like when a traditional jack simulates tension can be solved, and meanwhile, the cable-stayed bridge cable-girder anchoring structure scale test model loading device has the advantages of being short in modeling time consumption and low in test cost.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a cable-stayed bridge cable beam anchoring structure reduced scale test model loading device comprises a steel box beam section, an anchoring mechanism and an anchoring device, wherein the steel box beam section is arranged below an electro-hydraulic servo actuator; the anchoring mechanism is provided with two anchor backing plates and can fix two stay cables simultaneously; the anchor backing plate is arranged perpendicular to the loading direction of the electro-hydraulic servo actuator; and a force transmission steel frame is arranged between the beam of the electro-hydraulic servo actuator and the anchor backing plate.
As a further technical solution of the above solution, the anchoring device includes a base plate, a large triangular support plate and a small triangular support plate; the bed plate is fixed to be set up, big triangular support board fixed connection in the roof of steel box girder segment with between the bed plate, little triangular support board fixed connection in the web of steel box girder segment with between the bed plate.
As a further technical scheme of the scheme, the large triangular support plates are arranged side by side, and a connecting plate is fixedly connected between every two adjacent large triangular support plates.
As a further technical scheme of the scheme, the force transmission steel frame, the steel box girder section, the anchoring mechanism and the anchoring device are all steel structures.
As a further technical scheme of the scheme, the electro-hydraulic servo actuator is an electro-hydraulic servo long column compression testing machine.
The test method of the cable-stayed bridge cable-beam anchoring structure reduced scale test model loading device comprises the following steps:
determining the maximum cable force F of the cable-girder anchoring structure of the actual bridge 0 ；
Determining similarity coefficient lambda between the actual size of the cable-beam anchoring structure of the actual bridge and the geometric size of the reduced scale model 1 And obtaining the load similarity coefficient lambda of the actual size of the cable-girder anchoring structure of the actual bridge and the reduced scale model p ＝λ 1 2 Thus, the design load of the reduced scale model is obtained as F 1 ＝F 0 /λ p ；
The electro-hydraulic servo long column pressure testing machine is used as an electro-hydraulic servo actuator to load pressure, and formal monotonic static loading is carried out after at least 2 times of repeated preloading and unloading, and the method specifically comprises the following steps:
preloading and unloading: by design load F 1 Step-by-step preloading and step-by-step unloading 50% of the total weight of the steel, and repeating the step-by-step preloading and step-by-step unloading for at least 2 times;
formal monotonic static loading: in the range of 0 to F 1 Interval, step loading pressure; at F 1 When the yield load is within the range, loading pressure to the yield load in a grading manner; and in F 1 The graded loading pressure between the yield load range and the yield load range is less than 0 to F 1 Step loading pressure of the interval;
in the preloading and formal monotonous static loading, after each level of load is loaded, the load is stabilized for a certain time, then the reading is carried out, and the deformation and the cracking conditions of the test piece are observed.
Compared with the prior art, the invention has the following advantages and beneficial effects: according to the invention, the electro-hydraulic servo actuator is matched with the force transmission steel frame to simulate the cable force, the scale test model is placed upside down to enable the loading surface of the steel box girder section to be upward, and the corresponding anchoring mechanism is designed to realize the loading process, so that the difference between the simulated cable force and the cable force of a real bridge is reduced. The design of the loading device is more suitable for model test research of the double-guy cable steel anchor box, the structural design is reasonable, the operation method is simpler and more convenient compared with the traditional mode, the problem of low test result accuracy caused by various external factors such as incapability of simulating loading force, easiness in careless mistakes in the test process and the like is solved, and the loading device has the advantages of short modeling time and low test cost. The invention can be applied to an electro-hydraulic servo actuator to simulate the stay cable force so as to research the static behavior and fatigue performance evaluation of the cable beam anchoring structure of the double-stay cable steel anchor box.
Drawings
FIG. 1 is a schematic view of the present invention.
FIG. 2 is a schematic structural view of a force-transmitting steel frame according to the present invention.
Fig. 3 is a schematic structural view of a steel box girder segment according to the present invention.
Fig. 4 is a schematic structural view of the anchoring mechanism of the present invention.
Fig. 5 is a perspective view of the anchoring device of the present invention.
Fig. 6 is a schematic top view of the anchoring device of the present invention.
The explanation of each reference number in the figure is: crossbeam 1 of electro-hydraulic servo actuator passes power steelframe 2, steel case roof beam section 3, anchoring mechanism 4, bolt 5, anchor 6, bottom plate 301, web 302, roof 303, anchor backing plate 401, bed plate 601, big triangular support plate 602, connecting plate 603, little triangular support plate 604.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so as to further understand the concept of the present invention, the technical problems solved, the technical features constituting the technical solutions, and the technical effects brought by the technical solutions.
It should be understood that these embodiments are illustrative and not restrictive, and that the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of preferred embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.
The invention relates to a cable-stayed bridge cable-beam anchoring structure reduced scale test model loading device, which comprises an electro-hydraulic servo actuator, a force transmission steel frame 2, a steel box-beam section 3, an anchoring mechanism 4 and an anchoring device 6.
The anchoring mechanism 4 and the web plate 302 of the steel box girder section 3 are welded together to form a reduced-scale test model of the cable-girder anchoring girder section. The lower part of the steel box girder section 3 is welded with the anchoring device 6, and the anchoring device 6 is fixed to a test site through bolts 5. The top of the anchoring mechanism 4 is provided with two anchor backing plates 401 which can fix two stay cables simultaneously. The anchor backing plate 401 is horizontally arranged, the beam 1 of the electro-hydraulic servo actuator is right through the force transmission steel frame 2, and the loading direction of the force of the electro-hydraulic servo actuator is perpendicular to the anchor backing plate 401.
The invention is different from the traditional jack simulation tension, the cable force is simulated by matching the electro-hydraulic servo actuator with the force transmission steel frame 2, the scale test model is placed upside down to enable the loading surface of the steel box girder section 3 to be upward, and the corresponding anchoring mechanism 4 is designed to realize the loading process, thereby reducing the difference between the simulation cable force and the real bridge cable force. The design of the loading device is more suitable for model test research of the double-guy cable steel anchor box, the structural design is reasonable, the operation method is simpler and more convenient compared with the traditional mode, the problem of low accuracy of test results caused by various external factors such as incapability of simulating loading force, easiness in careless mistakes in the test process and the like is solved, and the loading device has the advantages of short modeling time consumption and low test cost. The invention can be applied to an electro-hydraulic servo actuator to simulate the stay cable force so as to research the static behavior and fatigue performance evaluation of the cable beam anchoring structure of the double-stay cable steel anchor box.
Based on the similarity principle, when the geometric dimension similarity coefficient of the reduced-scale test model is lambda 1 Then, the load similarity coefficient lambda can be obtained p ＝λ 1 2 Stress similarity coefficient λ σ ＝λ 1 Strain similarity coefficient lambda ε ＝λ 1 Angular displacement similarity coefficient lambda ψ ＝λ 1 Linear displacement similarity coefficient lambda δ ＝λ 1 . Therefore, under the action of similar loads, the stress distribution condition obtained by the reduced scale test directly reflects the stress level of the real bridge, and a set of space loading device consisting of the electro-hydraulic servo actuator, the force transmission steel frame 2, the reduced scale test model and the anchoring device 6 is provided through scheme design and theoretical analysis.
Based on the principle that the theoretical anchoring point (namely, point P in fig. 1) of the double-stay-cable steel anchor box is fixed in spatial position, the loading scheme is characterized in that the tension of two parallel stay cables borne by the double-stay-cable steel anchor box is equivalent to distributed load pressure to act on two anchor backing plates 401, the anchor backing plates 401 are used as loading surfaces, an electro-hydraulic servo actuator is adopted to match with a force transmission steel frame 2 and an anchoring device 6 to carry out spatial loading on a reduced scale test model, and the actual loading effect is simulated. A cable beam anchoring section and a beam section in a cantilever state are selected by comprehensively considering a test site and test equipment, and boundary conditions of an actual bridge can be well simulated.
The lower end of the scale test model is a fixed end, and the fixed end is welded with the anchoring device 6. The upper end of the reduced scale test model is a loading end, a force transmission steel frame 2 with the same plane size as a loading area is arranged between the anchor backing plate 401 and the beam 1 of the electro-hydraulic servo actuator, then the electro-hydraulic servo actuator is started, and the beam 1 of the electro-hydraulic servo actuator carries out loading action on the reduced scale test model through the force transmission steel frame 2.
The anchoring device 6 comprises a base plate 601, a large triangular support plate 602, a connecting plate 603 and a small triangular support plate 604. The bed plate 601 is horizontally arranged, and is provided with a through hole for the bolt 5 to pass through and be fixed with a test site. A large triangular support plate 602 is welded on one side of the base plate 601 close to the top plate 303 of the steel box girder section 3, and the large triangular support plate 602 is welded with the top plate 303 of the steel box girder section 3. The large triangular support plates 602 are arranged side by side, and a plurality of connecting plates 603 are welded among the large triangular support plates 602 to enhance the rigidity of the large triangular support plates 602. And small triangular support plates 604 are welded on the base plate 601 corresponding to the webs 302 on the two sides of the steel box girder section 3, and the small triangular support plates 604 are welded with the webs 302 of the steel box girder section 3.
An included angle is actually formed between the stay cable and the bridge floor, the included angle is expressed as an included angle alpha between the direction of the anchor mechanism 4 along the stay cable (namely the loading direction of the electro-hydraulic servo actuator) and the axis direction of the steel box girder section 3 in an actually selected model, the force transmission steel frame 2 matched with the electro-hydraulic servo actuator is convenient for loading, the stay cable force is well simulated, the steel box girder section 3 is selected to ensure that the loading surface of the anchor backing plate 401 is perpendicular to the force transmission steel frame 2, and at the moment, the included angle beta = 90-alpha between the fixed end of the steel box girder section 3 and the bottom plate 301 of the steel box girder section 3 is only required.
Vertical component force generated by space loading of the electro-hydraulic servo actuator and the force transmission steel frame 2 is balanced through a large triangular support plate 602 group of the anchoring device 6, and meanwhile, the lower part of the reduced scale test model is prevented from being separated from a base plate 601; lateral displacement of the scale test model is limited by the lateral small triangular supporting plate 604 group of the anchoring device 6, and loading reaction force is effectively transmitted to a test field through the base plate 601. The whole anchoring device 6 enables the scale test model to be in a self-balancing state under the pushing action of the force transmission steel frame 2.
The invention has definite and direct stress mechanism, a scale test model welded by a steel box girder section 3 and an anchoring mechanism 4 is anchored on a test site through an anchoring device 6 and a bolt 5, and a loading contact surface (an anchor backing plate 401) of a cable beam anchoring structure is vertical to the loading direction of an electro-hydraulic servo actuator. Because the whole scale test model is restrained by the anchoring device 6, the force transmission steel frame 2 directly applies the load of the electro-hydraulic servo actuator to the anchoring mechanism 4.
And carrying out nonlinear finite element analysis on components, contact modes and boundary conditions of the reduced scale test model and the loading counterforce system. The comparison of theoretical analysis results and test actual measurement results shows that: the loading device is definite in stress, the reaction system is still in an elastic stress state under the working condition of 2.5 times of the designed maximum main cable force, the bearing capacity is sufficient, the rigidity meets the requirement, and the scale test model can be safely and effectively loaded.
The test scale of the scale test model in the invention adopts 1. The design drawing of the scale test model adopts the engineering drawing of Yibin Linhong Yangtze river bridge, the model members adopted in the test are all steel structures, and the plates are connected in a welding mode.
The loading scheme of this embodiment is: the maximum cable force of the cable-girder anchoring structure of the actual bridge is F 0 =1500t, converted according to the scale, and based on the similarity principle, when the geometric dimension similarity coefficient of the scale test model is lambda 1 Then, the load similarity coefficient lambda can be obtained p ＝λ 1 2 Scale 1 of the present embodiment: 3, namely the similarity coefficient lambda between the actual size of the cable-girder anchoring structure of the actual bridge and the geometric size of the reduced scale model 1 =3, the load similarity coefficient lambda of the actual size of the cable-beam anchoring structure of the actual bridge and the reduced scale model can be obtained p ＝λ 1 2 ＝3 2 =9, so the design load of the reduced scale model is F 1 ＝F 0 /λ p ＝1500t/9≈167t。
This embodiment adopts two load operating modes: the pre-loading load adopts 1 time of design load-167 t (working condition I), and the yield load adopts 2.5 times of design load-420 t (working condition II). The concrete loading test method of the cable-stayed bridge cable-beam anchoring structure scale test model loading device comprises the following steps:
a10000 kN electro-hydraulic servo long column compression testing machine is used as an electro-hydraulic servo actuator (model: WAW-J10000) to load pressure. After repeating the preloading and unloading at least 2 times (preferably 2 times), formal monotonic static loading is performed.
The preloading method comprises the following steps: by usingDesign load F 1 50% (about 840 KN) of the pre-load and unload, repeated at least 2 times (preferably 2 times); the specific loading and unloading operation is as follows: the test piece is loaded according to 100 KN/grade until the test piece reaches 900KN, and then the test piece is unloaded according to 100 KN/grade to eliminate the inelastic deformation of the test piece.
The formal monotone static force loading comprises the following specific steps:
(1) Loading pressure between 0 and I working conditions: loading the pressure to 1600KN according to 200 kN/grade, and recording the pressure to 1670KN according to 70 KN/grade in the last step;
(2) Loading pressure between a working condition I and a working condition II: loading pressure to 2000KN according to 200 KN/level in an interval of 1670KN to 2000KN; in the interval of 2000 KN-4200 KN, the stress is loaded to the yield load of 4200KN according to the level of 100 KN/so that the yield phenomenon is easy to occur in the interval, and therefore the loading increment level in the interval is shortened so as to facilitate observation of appearance change of the test piece and the load-displacement curve relation of the test piece.
In the preloading and formal monotonous static force loading processes, after each stage of load loading, the load is stabilized for 10 minutes, then the reading is carried out, and the abnormal conditions of deformation, cracking and the like of the test piece are observed.
In order to facilitate loading and guarantee the reliability of test results, a steel box girder section 3 with an appropriate angle and containing an anchoring mechanism 4 is determined before a mould is built, and after the steel box girder section 3 is placed upside down, a loading contact area (two anchor backing plates 401) of the anchoring mechanism 4 is perpendicular to the loading direction of the electro-hydraulic servo actuator. In this example, an included angle α =33.646 ° between the anchoring mechanism 4 and the axial direction of the steel box girder section 3 along the direction of the stay cable (i.e., the loading direction of the electro-hydraulic servo actuator), and at this time, it is only necessary to design an included angle β =90 ° - α =90 ° -33.646 ° =56.535 ° between the fixed end of the steel box girder section 3 and the bottom plate 301 of the steel box girder section 3. The scale test model selects a beam section in a cable beam anchoring section and a cantilever state, the height of a web plate 302 of the steel box beam section 3 is determined by a design drawing, the length of a top plate 303 of the steel box beam section 3 is determined according to the distance between diaphragm plates, the length of a bottom plate 301 of the steel box beam section 3 is determined by beta =56.535 degrees, and the model size of the steel box beam section 3 at the moment is a proper test size.
And then welding the anchoring mechanism 4 and the steel box girder section 3 to form a reduced scale test model. For stable loading, the built scale test model is welded on the anchoring device 6 and anchored with the test site through the bolt 5. At this time, the assembly of the scale test model and the anchoring device 6 is completed, and then the loading action is carried out:
accurately placing the force transmission steel frame 2 on the two anchor backing plates 401 of the anchoring mechanism 4, and paying attention to the fact that the peripheral sizes of the force transmission steel frame 2 and the two anchor backing plates 401 are completely aligned; and then the assembled model is pushed to the electro-hydraulic servo long column pressure testing machine, at the moment, the loading direction of the electro-hydraulic servo long column pressure testing machine is perpendicular to the loading area (the anchor backing plate 401) of the anchoring mechanism 4, and the electro-hydraulic servo long column pressure testing machine is started to carry out loading action according to a set loading scheme.
In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally put in use of products of the present invention, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance. Unless expressly stated or limited otherwise, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections as well as integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a cable-stay bridge cable beam anchoring structure scale test model loading device which characterized in that: the device comprises a steel box girder section (3) arranged below an electro-hydraulic servo actuator, an anchoring mechanism (4) fixed in the steel box girder section (3), and an anchoring device (6) used for fixing the steel box girder section (3); the anchoring mechanism (4) is provided with two anchor backing plates (401) and can fix two stay cables at the same time; the anchor backing plate (401) is arranged perpendicular to the loading direction of the electro-hydraulic servo actuator; a force transmission steel frame (2) is arranged between the beam (1) of the electro-hydraulic servo actuator and the anchor backing plate (401); the anchoring device (6) comprises a base plate (601), a large triangular support plate (602) and a small triangular support plate (604); the base plate (601) is fixedly arranged, the large triangular support plate (602) is fixedly connected between the top plate (303) of the steel box girder section (3) and the base plate (601), and the small triangular support plate (604) is fixedly connected between the web plate (302) of the steel box girder section (3) and the base plate (601); an included angle alpha is arranged between the direction of the stay cable of the anchoring mechanism (4) and the axis direction of the steel box girder section (3), the force transfer steel frame (2) matched with the electro-hydraulic servo actuator can simulate the stay cable force well for loading, the selection of the steel box girder section (3) needs to ensure that the loading surface of the anchor backing plate 401 is vertical to the force transfer steel frame (2), and at the moment, the included angle beta = 90-alpha between the fixed end of the steel box girder section (3) and the bottom plate 301 of the steel box girder section (3) is only needed.
2. The cable-stayed bridge cable-beam anchoring structure reduced scale test model loading device as claimed in claim 1, characterized in that: the large triangular support plates (602) are arranged side by side, and a connecting plate (603) is fixedly connected between the adjacent large triangular support plates (602).
3. The cable-stayed bridge cable beam anchoring structure reduced scale test model loading device as claimed in claim 1, characterized in that: the force transmission steel frame (2), the steel box girder section (3), the anchoring mechanism (4) and the anchoring device (6) are all steel structures.
4. The cable-stayed bridge cable-beam anchoring structure reduced scale test model loading device as claimed in claim 1, characterized in that: the electro-hydraulic servo actuator is an electro-hydraulic servo long column pressure testing machine.
5. A test method of a cable-stayed bridge cable beam anchoring structure reduced scale test model loading device according to any one of claims 1 to 4, characterized by comprising the following steps:
determining the maximum cable force F of the cable-girder anchoring structure of the actual bridge 0 ；
Determining the similarity coefficient lambda between the actual size of the cable-girder anchoring structure of the actual bridge and the geometric size of the reduced scale model 1 And obtaining the load similarity coefficient lambda of the actual size of the cable-girder anchoring structure of the actual bridge and the reduced scale model p =λ 1 2 Thus, the design load of the reduced scale model is obtained as F 1 =F 0 /λ p ；
The electro-hydraulic servo long column pressure testing machine is used as an electro-hydraulic servo actuator to load pressure, and formal monotonic static loading is carried out after at least 2 times of repeated preloading and unloading, and the method specifically comprises the following steps:
preloading and unloading: by design load F 1 Step-by-step preloading and step-by-step unloading 50% of the total weight of the steel, and repeating the step-by-step preloading and step-by-step unloading for at least 2 times;
formal monotone static force loading: in the range of 0 to F 1 Interval, step loading pressure; at F 1 When the yield load is within the range, loading pressure to the yield load in a grading way; and in F 1 The graded loading pressure between the yield load range and the yield load range is less than 0 to F 1 Step loading pressure of the interval;
in the preloading and formal monotonous static loading, after each level of load is loaded, the load is stabilized for a certain time, then the reading is carried out, and the deformation and the cracking conditions of the test piece are observed.
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| CN114397190B (en) * | 2021-12-23 | 2024-01-02 | 东南大学 | Reduced scale test device and method for simulating ultimate bearing capacity of truncated cone of containment |
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