CN109632528B - Test equipment and method for simulating shearing resistance of pavement bonding interface of vertical rotation type open bridge - Google Patents
Test equipment and method for simulating shearing resistance of pavement bonding interface of vertical rotation type open bridge Download PDFInfo
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- CN109632528B CN109632528B CN201811332226.6A CN201811332226A CN109632528B CN 109632528 B CN109632528 B CN 109632528B CN 201811332226 A CN201811332226 A CN 201811332226A CN 109632528 B CN109632528 B CN 109632528B
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Abstract
The invention relates to a test device and a test method for simulating the shearing resistance of a pavement bonding interface of a vertical rotary open bridge, belonging to the crossing field of road engineering and bridge engineering. The half-span open bridge model is arranged in the constant temperature and humidity box, the LVDT sensing device is arranged on the bridge floor of the half-span open bridge model, and the environmental stress sensing device is connected with the half-span open bridge model; the LVDT sensing device transmits the received data to the processing control system; the environmental stress sensing device transmits the received data to the processing control system; the half-span opening bridge model is opened and closed in a constant temperature and humidity box. The invention can effectively simulate the actual stress condition of the bridge deck during the opening or closing process; the temperature and humidity range of the actual working environment of the open bridge is effectively simulated, the obtained data can truly reflect the use condition and dynamic shearing behavior of the open bridge in the actual operation process for paving the bonding layer, and meanwhile, the method can be used for the current less research on the influence of humidity on asphalt concrete.
Description
Technical Field
The invention relates to a test device and a test method for simulating the shearing resistance of a pavement bonding interface of a vertical rotary open bridge, belonging to the crossing field of road engineering and bridge engineering.
Background
The asphalt concrete pavement is closely connected with the steel bridge deck slab, and the asphalt concrete pavement and the steel bridge deck slab bear and deform together. In the continuous opening and closing process of the bridge cantilever structure, the weak bonding part between the pavement layer and the steel bridge deck bears the repeated shearing action which is continuously changed under the action of pavement gravity load. When the shear fatigue strength of the steel bridge deck pavement cannot meet the stress requirement, the pavement layer is sheared and damaged, and even the pavement layer is debonded and slides down in an opening state. For example, in 1975, The first opening of The U.S. Carling harbor Indian River Bridge (The Indian River Bridge) resulted in asphalt concrete pavements that exceeded 50% of The total area slipping down severely. The actual measurement temperature range of the steel bridge deck can reach-20 ℃ to 70 ℃, and the asphalt concrete is a typical time-temperature sensitive material, so that the pavement mechanical property of the asphalt concrete can obviously change along with the change of the temperature of the steel bridge deck. Moreover, the effect of air humidity on paving materials covers all years and, due to its particular gaseous character, can be absorbed in paving materials, including aggregates and asphalt binders, for long periods of time. Therefore, in order to detect the bonding state of the interlayer bonding interface of the open bridge steel bridge deck pavement composite structure and guide the design and construction process of the pavement composite structure, the shearing resistance of the pavement composite structure must be effectively tested.
At present, no mature test method exists for measuring the shearing resistance of the bridge deck bonding interface of the open bridge at home and abroad, particularly no uniform test equipment exists, and the dynamic shearing behavior of the actual engineering under the open or closed working condition can not be simulated by basically referring to the horizontal direct shearing or oblique shearing test of the existing bridge deck composite structure at home and abroad.
The general equipment for testing the shear resistance is a horizontal direct shear or oblique shear test referring to the existing bridge deck composite structure, and cannot simulate the dynamic shear behavior of the actual engineering of an open bridge under the opening or closing working condition.
Disclosure of Invention
The invention provides test equipment and a method for simulating the shearing resistance of a vertical rotary open bridge pavement bonding interface, and provides test equipment and a method for testing the shearing resistance of the open bridge deck pavement composite structure, mainly relating to the shearing fatigue resistance of the composite structure bonding interface and being suitable for design and research, indoor test and field engineering test of the open bridge pavement composite structure.
The invention adopts the following technical scheme:
the invention relates to a test device for simulating the shearing resistance of a pavement bonding interface of a vertical rotary open bridge, which comprises a half-span open bridge model; the system comprises an LVDT sensing device, a constant temperature and humidity box, an environmental stress sensing device and a data processing control system; the half-span open bridge model is arranged in the constant temperature and humidity box, the LVDT sensing device is arranged on the bridge floor of the half-span open bridge model, and the environmental stress sensing device is connected with the half-span open bridge model; the LVDT sensing device transmits the received data to the processing control system; the environmental stress sensing device transmits the received data to the processing control system; the half-span opening bridge model is opened and closed in a constant temperature and humidity box. The invention relates to a test device for simulating the shearing resistance of a pavement bonding interface of a vertical rotary open bridge, wherein a half-span open bridge model comprises a bridge pier, a box girder, a pivot, a steel bridge deck and pavement; the bridge pier is internally connected with a pivot through a chain wheel and drives the box girder to rise upwards or move to a horizontal position, a steel bridge deck is arranged on the box girder, and a paving layer is arranged on the steel bridge deck.
The invention relates to a test device for simulating the shearing resistance of a pavement bonding interface of a vertical rotary open bridge, which is characterized in that an LVDT sensing device is arranged in a pavement layer and used for measuring displacement data of the pavement layer, and an environmental stress sensing device comprises a temperature and humidity sensor, a torque sensor and a shearing stress sensor; the environment stress sensing device is used for monitoring the opening angle and the lifting speed of the half-span open bridge model, environment data in the constant temperature and humidity box and interlaminar shear deformation data of the composite structure, and is located on the longitudinal central line of the bridge and extends into the open bridge.
The test equipment for simulating the shearing resistance of the bonding interface paved by the vertically rotating open bridge has the advantages that the temperature control range of the constant temperature and humidity box is-30-100 ℃; the humidity control range is 30-98%.
The invention relates to a test method of test equipment for simulating the shearing resistance of a bonding interface paved by a vertical rotary open bridge, which comprises the following simulation test steps:
1) preparing a half-span open bridge model according to the model similarity ratio, and obtaining the main similarity ratio of the model through a dimensional analysis method in the data in the following table;
2) determining the thickness, the interval and the material characteristics of the internal structure of the half-span open bridge model through the numerical value ratio given by the following table;
| physical parameters | Numerical value | Physical parameters | Numerical value |
| Thickness of steel box girder roof (mm) | 1 | Poisson's ratio of steel plate | 0.3 |
| Transverse baffle spacing (mm) | 375 | Steel bridge panel elastic modulus (MPa) | 210000 |
| Transverse baffle thickness (mm) | 1 | Thickness of asphalt pavement layer (mm) | 10 |
| Thickness of the top plate trapezoid stiffening rib (mm) | 0.8 | Density (kg. m) of pavement-3) | 2500 |
| Top board stiffener upper mouth width (mm) | 30 | Density of steel plate (kg. m)-3) | 8700 |
| Width of lower opening of top plate stiffening rib (mm) | 17 | Pavement poisson's ratio | 0.25 |
| Roof rib spacing (mm) | 60 | Roof stiffener height (mm) | 28 |
3) Putting the half-span open bridge model prepared according to the parameters in the step 1) and the step 2) into a constant temperature and humidity box; a load application system sensing device at the tail pin at the tail end of the open bridge enables the environmental stress sensing device to be located on the longitudinal central line of the bridge and to penetrate into the open bridge;
4) recording the opening angle and the lifting speed of the half-span opening bridge, temperature and humidity data in the constant temperature and humidity box and interlaminar shear deformation data of the composite structure by corresponding sensors in the environmental stress sensing device;
5) after the bridge deck of the half-span open bridge in the step 3) is opened to a set height, the LVDT sensing device starts to record relative displacement data generated between the pavement layer and the bridge deck;
6) and the data processing control system calculates the collected data recorded by the sensor and the displacement data collected by the LVDT sensing device, draws a shear displacement curve, and calculates to obtain the data of the shearing strength of the pavement bonding interface.
According to the test method of the test equipment for simulating the shearing resistance of the paving bonding interface of the vertical rotation type open bridge, in the step 6), the shearing resistance of the paving bonding interface is calculated through the following formula;
τm＝Fm/Am
τp＝τm/Cσ
in the formula: tau ismFor paving the model shear strength, FmFor ultimate shear values between layers of the laid model, AmFor laying the bottom area of the model layer, τpShear strength of solid bridges, CσFor model bridge stress phaseLike a constant.
According to the test method of the test equipment for simulating the shearing resistance of the pavement bonding interface of the vertical rotary type bridge, the test is finished when the opening angle of the half-span opening bridge is increased in the steps from 3) to 5) until the set opening state is reached.
The test method of the test equipment for simulating the shearing resistance of the paving bonding interface of the vertical rotary open bridge, disclosed by the invention, stops the test when the paving of the half-span open bridge and the bridge deck generate larger relative displacement or the bonding layer is damaged and falls off in the steps 3) to 5).
Advantageous effects
Compared with other equipment for testing the shear resistance, the test equipment and the test method for simulating the shear resistance of the pavement bonding interface of the vertical rotary open bridge provided by the invention have the remarkable advantages that:
1. the equipment for testing the shearing resistance of the open bridge pavement bonding interface can effectively simulate the actual stress condition of the bridge deck pavement in the opening or closing process.
2. The temperature controllable range of the constant temperature and humidity box contained in the device is-30 ℃ to 100 ℃; the humidity control range is 30-98%; the temperature and humidity range of the actual working environment of the open bridge is effectively simulated, the obtained data can truly reflect the use condition and dynamic shearing behavior of the open bridge in the actual operation process, and the method can be used for the research on the influence of the humidity on the asphalt concrete at present.
3. Compared with a composite structure of a pavement layer used by common equipment for testing the shearing resistance, the half-span open bridge model has the advantages that the concrete structure of a real shell is finely restored through the piers, box girders, pivots, steel bridge decks, pavement and the pavement layer which are arranged in a certain proportion, the stress state of a real bridge is well reflected, and the key technical parameters in the design process of the model are given by the material parameters following the model similarity theory; the method can provide a favorable reference basis for the pavement bonding interface shear property test of the bridge.
Drawings
Figure 1 is a schematic structural view of the present invention,
FIG. 2 is a schematic view of the opening condition of the present invention at an opening angle of 0,
FIG. 3 is a schematic view of the opening condition of the present invention at an opening angle of 85 °.
In the figure, 1 is a data control and processing system, 2 is an environmental stress sensing device, 3 is a temperature and humidity control box, 4 is a pavement layer, 5 is an LVDT sensing device, 6 is a pivot, 7 is a box girder, and 8 is a bridge pier.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
As shown in fig. 1:
the invention relates to a test device for simulating the shearing resistance of a pavement bonding interface of a vertical rotary open bridge, which comprises a half-span open bridge model; the system comprises an LVDT sensing device, a constant temperature and humidity box, an environmental stress sensing device and a data processing control system; the half-span open bridge model is arranged in the constant temperature and humidity box, the LVDT sensing device is arranged on the bridge floor of the half-span open bridge model, and the environmental stress sensing device is connected with the half-span open bridge model; the LVDT sensing device transmits the received data to the processing control system; the environmental stress sensing device transmits the received data to the processing control system; the half-span opening bridge model is opened and closed in a constant temperature and humidity box.
As shown in fig. 1: the half-span open bridge model comprises a bridge pier, a box girder, a pivot, a steel bridge deck and pavement; the bridge pier is internally connected with a pivot through a chain wheel and drives the box girder to rise upwards or move to a horizontal position, a steel bridge deck is arranged on the box girder, and a paving layer is arranged on the steel bridge deck. The bridge deck pavement is in a complex natural environment and is influenced by different temperatures and humidity, and the temperature and the humidity between layers of the bridge deck pavement change along with the temperature and the humidity. The bridge deck structure layer can generate expansion and shrinkage deformation due to temperature rise and fall, and expansion and shrinkage stress is generated when the bridge deck structure layer is blocked; when a temperature gradient exists in the bridge deck structural layer, buckling deformation is generated and is blocked to generate buckling stress. The mechanical property of asphalt concrete pavement can obviously change along with the change of the temperature of the steel bridge deck. Moreover, the influence of air humidity on paving systems covers all years, and due to its special gaseous characteristics, it can be adsorbed in paving materials, including aggregates and asphalt binders, for a long time, which has an adverse effect on the mechanical properties of asphalt concrete, but currently, few studies are made on the influence of humidity on asphalt concrete. The temperature and humidity conditions of the opened bridge are controlled by the temperature and humidity control box, the interlaminar shearing force and the shearing deformation of the composite structure under different temperature and humidity conditions are monitored, and experiments and data support are provided for the research on the influence of the humidity and the temperature on the asphalt concrete. The temperature control range of the temperature and humidity control box is-30-100 ℃, the humidity control range is 30-98%, and the temperature and humidity change range in the actual operation process of the vertical rotary open bridge deck pavement can be basically covered.
As shown in fig. 2 and 3: different opening states and different opening angles of the bridge are realized through the switch of the electric device, and the range of the opening angles is 0-85 degrees. Therefore, interlayer characteristics of the opening bridge in different opening angle static states are researched. The device can also be used for researching the interlaminar shear deformation of the pavement and bridge deck pavement composite structure. The half-span open bridge model is arranged in the constant temperature and humidity box, the LVDT sensing device is arranged on the bridge floor of the half-span open bridge model, and the LVDT sensing device transmits the received data to the processing control system; the environmental stress sensing device transmits the received data to the processing control system; a chain wheel is arranged in the pier and connected with a pivot, and the opening and closing of the opening bridge are completed through the rotation of the chain wheel. The LVDT sensing device actually measures the relative shear deformation of the composite structure, and then the shear force in the shear resistance test is actually measured through the loading system sensing device. The tail end of the LVDT sensor is tightly connected with the pavement layer at the top end of the bridge. After the device is started, the power, the on and off of the electric device are changed to control the starting speed and the starting amplitude. The temperature and humidity conditions of the open bridge are controlled through the temperature and humidity control box, so that the actual simulation of the open bridge engineering is realized.
The invention can change the opening speed of the opening bridge and realize constant speed opening and variable speed opening. The open bridge is subjected to three stages of speed change, constant speed, speed change and the like in the opening process, and interlayer shearing characteristic values in different stages are monitored through the device, so that the paved dynamic shearing behavior is analyzed, and a basis is provided for determining the opening and closing schemes of the open bridge. Meanwhile, effective parameter values can be provided for simulation analysis by using finite element software.
The device can simulate the mechanical response of different bonding layers, paving layer materials and composite structures in the actual open bridge working state, and is convenient for researching the characteristics of the paving materials.
The test method of the test equipment for simulating the shearing resistance of the pavement bonding interface of the vertical rotary open bridge comprises the following steps:
1. making of models
The open bridge that this experiment adopted is the reduced scale model of actual bridge, because this model is bridge deck pavement's extreme bearing capacity model to consider the requirement in experimental area, we adopt 1: scale of 10. The bridge model is opened with a clear span of 3.8m and a bridge width of 2.0 m. The main similarity ratios of the models obtained from the dimensional analysis are shown in table 1.
TABLE 1 model Primary similarity ratio
The device structure contains almost all of the features of the actual open bridge. The structure composition comprises electric opening devices such as bridge piers, pivots, chain wheels and the like, internal structures such as stiffening ribs, transverse partition plates, longitudinal partition plates and the like, and also comprises bridge decks and paving layers on the bridge decks. The thickness, spacing and material properties of the inner primary structure are shown in table 2.
TABLE 2 model Primary physical parameters
Wherein the pavement layer comprises an asphalt concrete pavement layer and a bonding layer. The asphalt concrete pavement layer can be made of different materials according to different research needs. This test piece only needs the preparation half to stride the structure. The following is an exemplary embodiment of a single layer mat. The pavement layer adopts 2910 type light domestic epoxy asphalt concrete, and the bonding layer adopts 2451 type domestic epoxy asphalt bonding material. The gradation and technical index are shown in tables 3, 4 and 5.
2. Preparation of the test
And placing the manufactured half-span open bridge model into a constant temperature and humidity box, and installing an LVDT sensing device at a tail pin at the tail end of the open bridge to enable the environmental stress sensing device to be positioned on the longitudinal central line of the bridge and to penetrate into the open bridge. And debugging the electric device and the sensing device, and setting test parameters such as the starting speed, the starting amplitude, the temperature, the humidity and the like of the test.
3. Test of
After the test preparation is completed, the electric device is opened to open the opening bridge, and the test is started. And recording data such as displacement, time, temperature, shear force value and the like of the pavement layer in the opening process in real time through a data acquisition system. Along with the continuous increase of the opening angle, the interlaminar shear stress between the pavement and the steel plate also changes along with the increase of the opening angle until the set opening state is reached, and the test is finished. During the test, when the relative displacement between the paving layer and the bridge deck slab is large or the bonding layer is damaged or even delaminated, the test is stopped.
4. Processing of test data
When the open bridge reaches a set open state or the interlayer interface is damaged in the process (the shear stress reaches a peak value, and then a shear stress curve descends along with the increase of the abscissa), the control system stops the test, automatically stores relevant data and draws a shear displacement curve. Through data processing and research, the related result of the shearing resistance of the pavement bonding interface can be obtained. And adjusting relevant test parameters to prepare for the next test.
TABLE 3 recommended gradation of epoxy asphalt mixture
TABLE 4 design index of epoxy asphalt mixture
Technical requirements of domestic epoxy asphalt binder of type table 52451
The device is suitable for the fields of design and research of a vertical rotary open bridge pavement composite structure, indoor tests, field engineering detection and the like:
1. the method is applied to selection and determination of a scheme for paving a bridge deck of an open bridge. The working state of the pavement layer in the actual engineering is simulated through the indoor test of the device on the shearing resistance characteristics of the bonding interfaces of different pavement structures and materials, and comparison tables and curves of different materials and structures are manufactured to provide a basis for selecting a pavement layer scheme.
2. The method is applied to determination of an opening bridge opening scheme. Under the condition that a layer structure and a material of pavement are established, the temperature and humidity control box simulates the climate and humidity conditions of the place where the engineering is located, and the opening is divided into three different stages: accelerating starting, constant speed starting and decelerating starting. Parameters such as acceleration, duration and the like of the three stages are changed, and a shear deformation curve measured by the device is observed to determine a proper opening scheme of the opening bridge.
3. The method is applied to response analysis of the speed change starting power for paving the bridge deck of the starting bridge. Under the conditions of being influenced by environmental temperature and humidity and dynamically opening and closing, the interlayer bonding performance between the pavement layer and the steel plate can bear the shearing stress action of dynamic change, and the problem that the design of the pavement layer of the open bridge needs to be focused is solved. The device can measure the shear deformation curve of the open axle in the variable speed opening stage, and provides a basis for researching dynamic response.
4. The test device has high design difficulty of manufacturing and measuring systems, and key technical parameters in the model design process are given. Can provide reference for the development of similar model tests in the future.
The ultimate strength to resist shear failure is called shear strength τ, and is numerically equal to the ratio of shear force value to shear area when shear failure occurs between layers. The data obtained in the test are simply processed, so that the shear strength value of the paved bonding interface of the open bridge under the temperature-humidity coupling effect can be obtained. The opening bridge is started through a set opening scheme, and the shearing stress value between the layers of the pavement layer is increased along with the continuous increase of the opening angle in the opening process. When the pavement layer and the bridge deck generate large relative displacement or the bonding layer is damaged or even delaminated, recording the interlayer shear force value F at the momentmThen the shear strength τ is calculated as:
τm＝Fm/Am
τp＝τm/Cσ
in the formula: tau ism-the shear strength of the pavement model, MPa; fm-ultimate shear value, N, between layers of the paving model; a. themBottom area of the paved model layer, mm2；τp-solid bridge shear strength; cσThe model bridge stress similarity constant is 0.1.
The model design determines the similarity constant of the model, and comprehensively considers the model type, the test and manufacturing conditions of the model and the like. The model is designed strictly according to the following principle:
(1) the model bridge is similar to the original bridge in geometric size;
(2) the model bridge is similar to the original bridge in boundary condition;
(3) the model bridge has similar physical parameters with the original bridge, including load property and size.
The model bridge can accurately reflect the stress characteristic of the real bridge, and the calculation of several structural responses mainly researched by the device is as follows:
σp＝σm/Cσ
εp＝εm
δp＝δm/Cδ
in the formula: sigmap、σm-stress of solid bridges, model bridges; epsilonp、εm-strain of solid bridges, model bridges; deltap、δm-displacement of solid bridges, model bridges; cσ-model bridge stress similarity constant; cδThe model bridge is shifted by a quasi-constant.
The experimental measured value of the device is well matched with the finite element simulation calculated value and the real bridge conversion value, and the experimental data can be used for guiding the design of the real bridge.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. Simulation is opened bridge formation bonding interface shear characteristic test equipment immediately, its characterized in that: the method comprises the steps of (1) including a half-span open bridge model; the system comprises an LVDT sensing device, a constant temperature and humidity box, an environmental stress sensing device and a data processing control system; the half-span open bridge model is arranged in the constant temperature and humidity box, the LVDT sensing device is arranged on the bridge floor of the half-span open bridge model, and the environmental stress sensing device is connected with the half-span open bridge model; the LVDT sensing device transmits the received data to the processing control system; the environmental stress sensing device transmits the received data to the processing control system; the half-span opening bridge model is opened and closed in a constant temperature and humidity box.
2. The test equipment for simulating the shearing resistance of the paving bonding interface of the vertical rotary type open bridge as claimed in claim 1, wherein: the half-span open bridge model comprises a bridge pier, a box girder, a pivot, a steel bridge deck and a paving layer; the bridge pier is internally connected with a pivot through a chain wheel and drives the box girder to rise upwards or move to a horizontal position, a steel bridge deck is arranged on the box girder, and a paving layer is arranged on the steel bridge deck.
3. The test equipment for simulating the shear resistance of the paving bonding interface of the vertical rotary type open bridge according to claim 1 or 2, wherein: the LVDT sensing device is arranged in the pavement layer and used for measuring displacement data of the pavement layer, and the environmental stress sensing device comprises a temperature and humidity sensor, a torque sensor and a shear stress sensor; the environment stress sensing device is used for monitoring the opening angle and the lifting speed of the half-span open bridge model, environment data in the constant temperature and humidity box and interlaminar shear deformation data of the composite structure, and is located on the longitudinal central line of the bridge and extends into the open bridge.
4. The test equipment for simulating the shearing resistance of the paving bonding interface of the vertical rotary type open bridge as claimed in claim 1, wherein: the temperature control range of the constant temperature and humidity box is-30-100 ℃; the humidity control range is 30-98%.
5. The test method for simulating the shear resistance test equipment of the paving bonding interface of the vertical rotary type open bridge according to any one of claims 1 to 4, characterized in that: the simulation test procedure is as follows:
1) preparing a half-span open bridge model according to the model similarity ratio, and obtaining the main similarity ratio of the model shown in the following table according to a dimensional analysis method;
2) determining the thickness, the interval and the material characteristics of the internal structure of the half-span open bridge model through the numerical value ratio given by the following table;
3) Putting the half-span open bridge model prepared according to the parameters in the step 1) and the step 2) into a constant temperature and humidity box; a load application system sensing device at the tail pin at the tail end of the open bridge enables the environmental stress sensing device to be located on the longitudinal central line of the bridge and to penetrate into the open bridge;
4) recording the opening angle and the opening speed of the half-span opening bridge, temperature and humidity data in the constant temperature and humidity box and interlaminar shear deformation data of the composite structure by corresponding sensors in the environmental stress sensing device;
5) after the bridge deck of the half-span open bridge in the step 3) is opened to a set height, the LVDT sensing device starts to record relative displacement data generated between the pavement layer and the bridge deck;
6) and the data processing control system calculates the collected data recorded by the environmental stress sensing device and the displacement data collected by the LVDT sensing device, draws a shear displacement curve, and calculates to obtain the data of the shearing strength of the paved bonding interface.
6. The test method for simulating the shear resistance test equipment of the paving bonding interface of the vertical rotary type open bridge according to claim 5, wherein the test method comprises the following steps: the shear strength of the pavement bonding interface is calculated through the following formula in the step 6);
τm＝Fm/Am
τp＝τm/Cσ
in the formula: tau ismFor paving the model shear strength, FmFor ultimate shear values between layers of the laid model, AmFor laying the bottom area of the model layer, τpShear strength of solid bridges, CσIs the model bridge stress similarity coefficient, i.e., 1/10.
7. The test method for simulating the shear resistance test equipment of the paving bonding interface of the vertical rotary type open bridge according to claim 5, wherein the test method comprises the following steps: and in the steps 3) to 5), when the opening angle of the half-span opening bridge is increased until a set opening state is reached, ending the test.
8. The test method for simulating the shear resistance test equipment of the paving bonding interface of the vertical rotary type open bridge according to claim 5, characterized in that: and (3) stopping the test when the paving layer of the half-span open bridge and the bridge deck generate larger relative displacement or the bonding layer is damaged and falls off in the steps from 3) to 5).
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| CN205879702U (en) * | 2016-06-28 | 2017-01-11 | 长沙理工大学 | Bridge deck pavement layer in situ shear test device |
| CN106092775B (en) * | 2016-08-02 | 2018-11-16 | 吉林大学 | Cement Concrete Deck Paving Course and floorings shearing strength at intersection stiffness test method |
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