Building membrane structure performance testing device in simulated corrosion environment and safety evaluation method

Abstract

The application provides a building membrane structure performance testing device and a safety evaluation method in a simulated corrosion environment, and relates to the technical field of building membrane structure performance testing devices. The building membrane structure performance testing device comprises a membrane material tensioning device, an artificial simulated corrosion device and a data acquisition system. The membrane material tensioning device is used for fixing a building membrane material to be tested and applying a tensioning force to the building membrane material during testing. The artificial simulated corrosion device comprises a control module, a booster water pump and an ultraviolet lamp. The control module controls the booster water pump and the ultraviolet lamp to simulate a corrosion aging environment of the building membrane material during testing. The data acquisition system comprises a laser displacement sensor. When the building membrane material with a mark point deforms in the simulated corrosion aging environment, the laser displacement sensor monitors the deformation of the mark point and forms testing data. The application can accurately control the tensioning force and direction of the membrane structure and carry out long-term corrosion after tensioning is completed. The application can accurately analyze and evaluate the mechanical properties of the safety performance of the membrane structure before and after corrosion.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of safety evaluation of building membrane structure after corrosion, in particular to a simulation corrosion environment building membrane structure performance testing device and a safety evaluation method. BACKGROUND

[0002] In the field of construction engineering, tensile membrane structure is a widely used large-span tensile integral structure. This structure is favored by architects because of its aesthetic, economic and easy to build advantages. Its stiffness mainly relies on the pre-tension to provide, only by providing appropriate initial pre-tension, the membrane structure has enough stiffness to resist external load.

[0003] With the increasing application of membrane structure, a large number of large-span membrane structure industrial plant buildings appear in the southeast coastal areas of China. Due to the corrosion of coastal atmosphere and ultraviolet rays on the membrane structure, more and more membrane structures have safety hazards, therefore, how to evaluate the service safety of the membrane structure in the corrosion environment is an urgent problem to be solved.

[0004] The existing technology provides devices and methods mainly focusing on the field of material performance testing, mainly concerned about the mechanical properties of membrane structure under external load, such as patent 201910868057.6 provides a device and method for measuring the hail impact load of membrane structure, the device for measuring the hail impact load of membrane structure includes a rack, a tensioning mechanism, a hail launching mechanism and a signal acquisition mechanism, wherein the rack is a cross-shaped tensioning rack, the rack is formed with four installation ends symmetrically arranged at intervals, and the rack is used to drive the clamping membrane device to move through the electro-hydraulic push-pull rod, so that the clamping device is tensioned to the membrane structure to be tested and forms a membrane surface with stable pre-tension.

[0005] Patent 201710954739.X provides a device and method for testing the complete performance of building membrane material under the action of force and heat radiation. The single or double-axis membrane material test piece is clamped on two or four sets of sliding blocks to form a stable pre-tension membrane surface, and then the fixed heat radiation source is sprayed to the membrane surface until the experiment is completed.

[0006] Patent 202211052746.8 provides a saddle-shaped and planar membrane structure dual-purpose test device, which uses a movable crossbar to determine the rise-to-span ratio of the saddle-shaped membrane structure, and repeatedly adjusts the manual winch to obtain the required pre-stress and the rise-to-span ratio of the saddle-shaped membrane structure.

[0007] Summarizing the existing technology, it can be found that:

[0008] 1. The testing device and method proposed have not noticed the demand for safety performance research of building membrane material in actual service process in corrosion environment.

[0009] 2. Most of the proposed testing devices are suitable for planar membrane tensioning, while most architectural membrane surfaces are saddle-shaped. Existing technologies cannot control the deformation of the membrane surface in the plumb direction during tensioning, which will cause the membrane surface to deform in the plumb direction during the tensioning process, seriously affecting the tensioning and forming of architectural membrane structures.

[0010] 3. There is a lack of accurate and reasonable assessment methods for the safety evaluation of building membrane structures before and after corrosion. Summary of the Invention

[0011] This invention proposes a performance testing device and safety assessment method for building membrane structures in simulated corrosive environments. It overcomes the shortcomings of existing technologies, such as the inability to control the deformation of the tensioned membrane plumb bob and the inability to conduct safety performance assessments of membrane structures under long-term corrosive conditions. It can accurately control the tension and direction of the membrane structure and conduct long-term corrosion after tensioning, enabling accurate mechanical performance analysis and assessment of the membrane structure's safety performance before and after corrosion.

[0012] The present invention adopts the following technical solution.

[0013] A performance testing device for architectural membrane structures under simulated corrosion environments is used to test the performance and assess the safety of architectural membrane materials. It includes a membrane tensioning device, an artificial corrosion simulation device, and a data acquisition system. The membrane tensioning device is used to fix the architectural membrane material under test and apply tension to it during testing. The artificial corrosion simulation device includes a control module and connected booster pumps and ultraviolet lamps. During testing, the control module simulates the corrosion aging environment of the membrane material by quantitatively switching the booster pump and ultraviolet lamps. The data acquisition system includes a laser displacement sensor. When the architectural membrane material with marked points deforms in the simulated corrosion aging environment, the laser displacement sensor monitors the deformation corresponding to the marked points and generates test data.

[0014] The membrane tensioning device includes an upper convex clamping plate (2) and a lower concave clamping plate (3) for fixing a rectangular architectural membrane (1); it also includes a slide rail support rod (4), a slide rail (5), a tension sensor (6) and a support frame (7); small holes are evenly drilled around the membrane; when fixing the membrane, high-strength boundary bolts (8) are used to pass through the small holes around the membrane to fix the four sides of the membrane to the upper convex clamping plate (2) and the lower concave clamping plate (3) respectively;

[0015] The marking points on the building membrane are light-scattering marking points (18).

[0016] The artificial simulation corrosion device comprises a salt solution storage tank (9), a booster water pump (10), a liquid delivery pipe (11), an atomizing nozzle (12), an ultraviolet lamp (13), an ultraviolet lamp cover (14), a controller (15), a support plate (16) and a support frame (17); the booster water pump (10) is connected to the salt solution storage tank (9);

[0017] The first end of the liquid delivery pipe (11) is connected to the booster water pump (10); the end of the liquid delivery pipe (11) is connected to a plurality of atomizing nozzles (12) pointing to the building membrane to be tested; the ultraviolet lamp cover (14) is arranged outside the ultraviolet lamp (13); the controller is connected to the booster water pump (10) and the ultraviolet lamp (13); the atomizing nozzles (12), the ultraviolet lamp (13) and the ultraviolet lamp cover (14) are fixed to the support plate (16).

[0018] The support frame (17) is used for fixing the support plate (16), and the projection area of the support plate (16) on the ground is smaller than the surface area of the building membrane to be tested (1).

[0019] The support frame body (7) is composed of a top layer square steel pipe (7-1), a bottom layer square steel pipe (7-2), a four-corner square steel pipe column (7-3), a four-corner diagonal square steel pipe (7-4) and a bottom steel sheet (7-5).

[0020] The slide rail support rods (4) are respectively connected to the slide rails (5) and the upper convex clamping plates (2) and the lower concave clamping plates (3); the slide rail support rods are placed at the slide rails and slide, and the slide rails (5) constrain the building membrane (1) to move in the tension direction when the building membrane (1) is tensioned.

[0021] U-shaped lock buckles (22) are welded at the middle positions of the upper convex clamping plates (2) and the lower concave clamping plates (3); the number of the upper convex clamping plates is two and they are parallel to each other; the number of the lower concave clamping plates is two and they are parallel to each other; the tension female bolts (23) are welded at the perpendicular positions of the top layer square steel pipes (7-1) and the U-shaped lock buckles (22); the front and rear ends of the tension sensor (6) are respectively connected to the lifting eyes; the front lifting eye (24-1) is connected to the U-shaped lock buckle (22); the rear lifting eye (24-2) is connected to the front end of the universal ring (25); the rear end of the universal ring (25) is connected to the tension male screw rod (26); the building membrane (1) is tensioned by uniformly rotating the tension male screw rod (26), so that the building membrane (1) forms a saddle shape in the tension process due to the constraint of the upper convex clamping plates and the lower concave clamping plates, and the tension value in the tension process is monitored by the tension sensor (6).

[0022] The four-corner square steel pipe columns (7-3) are welded to the support frames (17), and the support frames (17) are welded to the support plates (16).

[0023] The salt solution storage tank (9) outputs the corrosion salt solution to the booster water pump (10), which outputs a certain amount of corrosion salt solution to the measured building membrane according to the instruction of the control module.

[0024] The controller is used for timing and quantitative control of the ultraviolet lamp (13) and the booster water pump (10) to open the membrane for spraying and ultraviolet aging test.

[0025] The safety evaluation method of the simulated corrosion environment building membrane structure performance test device adopts the simulated corrosion environment building membrane structure performance test device described above, and is characterized by comprising the following steps.

[0026] Step S1: The plurality of scattered light marker points (18) are pasted on the surface of the building membrane (1), and the laser displacement sensor (19) is used to test the distance X1 from the uncorroded building membrane (1), and the test data is transmitted to the computer (21) for storage.

[0027] Step S2: The ultraviolet lamp (13) and the booster water pump (10) are turned on to spray and ultraviolet aging test the membrane.

[0028] Step S3: The laser displacement sensor (19) is used to test the scattered light marker points (18) pasted on the surface of the building membrane (1) after completing the aging test, and the deformation data X2 of the building membrane (1) after corrosion is obtained.

[0029] Step S4: Based on the X1 and X2 data stored in the computer (21), a finite element model (27) of the building membrane (1) after corrosion is established, a plurality of load cases of the finite element model (27) are simulated, the stress state of the building membrane (1) under different load states before and after corrosion is analyzed, and the safety evaluation of the building membrane (1) is carried out according to the numerical analysis results.

[0030] The method further comprises the following steps.

[0031] Step S5: Artificially apply static or dynamic load to the surface of the building membrane (1) by using counterweight or small ball, and monitor the deformation data X3 of the surface of the building membrane (1) by using the laser displacement sensor (19) during the load application process.

[0032] Step S6: Based on the X1 and X3 data stored in the computer (21), the finite element model (27) is imported, and the safety evaluation of the building membrane (1) before and after corrosion is carried out according to the numerical analysis results.

[0033] Compared with the prior art, the application is simple to manufacture and convenient to operate, can be used to carry out relevant corrosion tests and tests, can accurately obtain the configuration of the membrane structure before and after corrosion, and can accurately carry out safety evaluation of the membrane structure, obtain complete stress and strain of the membrane structure before and after corrosion, and provide a test device and an evaluation method for all parties in the field of building operation, construction, membrane material manufacturers and basic scientific research, fill a gap in the field of corrosion environment of building membrane structure, and have very important social and economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0034] The application will be further described in detail below in combination with the drawings and specific embodiments:

[0035] Figure 1 is a schematic structural diagram of a tensioning complete test device of the application; Figure 1

[0036] Figure 2 is a schematic structural diagram of a test device of the application; Figure 2

[0037] Figure 3 is a schematic structural diagram of a tensioning device of the application; Figure 3 Figure 4 is a schematic structural diagram of an artificial simulation corrosion device of the application;

[0038] Figure 4 Figure 5 is a flow chart of a safety evaluation method of the application.

[0039] Figure 6 is a flow chart of a safety evaluation method of the application. Figure 5 DETAILED DESCRIPTION

[0040] The application will be further described in detail below in combination with the drawings and specific embodiments:

[0041] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0042] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and in addition, it should be understood that when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of a feature, step, operation, device, component and / or combination thereof.

[0043] ​​​​As shown in the figure, the simulated corrosion environment building membrane structure performance testing device is used for performance testing and safety performance evaluation of the building membrane material, and comprises a membrane material tensioning device, an artificial simulated corrosion device and a data acquisition system; the membrane material tensioning device is used for fixing the building membrane material to be tested and applying tension to the membrane material during testing; the artificial simulated corrosion device comprises a control module, a booster water pump and an ultraviolet lamp connected to the control module; the control module simulates the corrosion aging environment of the membrane material by quantitatively switching the booster water pump and the ultraviolet lamp during testing; and the data acquisition system comprises a laser displacement sensor, which monitors the deformation of the marked point corresponding to the deformation of the building membrane material with the marked point in the simulated corrosion aging environment of the membrane material and forms test data.

[0044] The membrane material tensioning device comprises an upper convex clamping plate 2 and a lower concave clamping plate 3 for fixing a rectangular building membrane material 1; further comprises a slide rail support rod 4, a slide rail 5, a tension sensor 6 and a support frame body 7; small holes are uniformly drilled around the membrane material; the upper convex clamping plate 2 and the lower concave clamping plate 3 use high-strength boundary bolts 8 to pass through the small holes around the membrane material when fixing the membrane material, and the four edges of the membrane material are respectively fixed on the upper convex clamping plate 2 and the lower concave clamping plate 3;

[0045] The marked point on the building membrane material is a scattered light marked point 18 capable of scattering light;

[0046] The artificial simulated corrosion device comprises a salt solution storage tank 9, a booster water pump 10, a liquid delivery pipe 11, an atomizing nozzle 12, an ultraviolet lamp 13, an ultraviolet lamp shade 14, a controller 15, a support plate 16 and a support frame 17; the booster water pump 10 is connected to the salt solution storage tank 9;

[0047] The booster water pump 10 is connected to the liquid delivery pipe 11 at the first end; a plurality of atomizing nozzles 12 directed to the building membrane material to be tested are connected to the liquid delivery pipe 11 at the end; the ultraviolet lamp shade 14 is arranged outside the ultraviolet lamp 13; the controller is connected to the booster water pump 10 and the ultraviolet lamp 13; the atomizing nozzle 12, the ultraviolet lamp 13 and the ultraviolet lamp shade 14 are fixed to the support plate 16;

[0048] The support frame 17 is used for fixing the support plate 16, and the projection area of the support plate 16 on the ground is smaller than the surface area of the building membrane material 1 to be tested.

[0049] The support frame body 7 is composed of a top layer square steel pipe 7-1, a bottom layer square steel pipe 7-2, four corner square steel pipe columns 7-3, four corner diagonal square steel pipes 7-4 and a bottom steel sheet 7-5.

[0050] The slide rail support rod 4 is connected with the slide rail 5 and the upper convex clamping plate 2 and the lower concave clamping plate 3, respectively, and the slide rail support rod is placed at the bottom sheet of the slide rail, and when the building membrane material 1 is tensioned, the slide rail 5 restricts the building membrane material 1 to move in the tension direction.

[0051] The U-shaped lock buckle 22 is welded at the middle position of the upper convex clamping plate 2 and the lower concave clamping plate 3, the number of the upper convex clamping plate is two and they are parallel to each other, the number of the lower concave clamping plate is two and they are parallel to each other, the top layer square steel pipe 7-1 is welded with the tension female bolt 23 at the vertical position of the U-shaped lock buckle 22, the front and rear ends of the tension sensor 6 are connected with the lifting ring, respectively, the front lifting ring 24-1 is connected with the U-shaped lock buckle 22, the rear lifting ring 24-2 is connected with the front end of the universal ring 25, the rear end of the universal ring 25 is connected with the tension male screw rod 26, the building membrane material 1 is tensioned by rotating the tension male screw rod 26 uniformly, the building membrane material 1 forms a saddle shape in the tension process due to the restriction of the upper convex clamping plate and the lower concave clamping plate, and the tension value in the tension process is monitored by the tension sensor 6.

[0052] The four-corner square steel pipe column 7-3 is welded with the support frame 17, and the support frame 17 is welded with the support plate 16.

[0053] The salt solution storage tank 9 outputs the corrosion salt solution to the booster water pump 10, and the booster water pump outputs the quantitative corrosion salt solution to the measured building membrane material through the infusion tube and the spray according to the instruction of the control module.

[0054] The controller is used for timing and quantitative control of the opening of the ultraviolet lamp tube 13 and the booster water pump 10 to spray and ultraviolet aging test on the membrane material.

[0055] The safety evaluation method of the building membrane structure performance test device in the simulated corrosion environment adopts the building membrane structure performance test device in the simulated corrosion environment, and is characterized by comprising the following steps.

[0056] Step S1: The plurality of astigmatism mark points 18 are pasted on the surface of the building membrane material 1, the distance X1 from the astigmatism mark points 18 to the uncorroded building membrane material 1 is tested by using the laser displacement sensor 19, and the test data is transmitted to the computer 21 for storage.

[0057] Step S2: The ultraviolet lamp tube 13 and the booster water pump 10 are turned on to spray and ultraviolet aging test on the membrane material.

[0058] Step S3: The astigmatism mark points 18 pasted on the surface of the building membrane material 1 after the aging test are tested by using the laser displacement sensor 19, and the deformation data X2 of the building membrane material 1 after the corrosion aging is obtained.

[0059] Step S4: Based on the X1 and X2 data stored in the computer 21, a finite element model 27 of the building membrane 1 after corrosion is established, and simulation of various load cases is performed on the finite element model 27 to analyze the stress state of the building membrane 1 under different load states before and after corrosion, and safety evaluation of the building membrane 1 is carried out according to the numerical analysis results.

[0060] The method further comprises the following steps:

[0061] Step S5: Artificially applying static or dynamic load to the surface of the building membrane 1 using counterweights or small balls, and monitoring the deformation data X3 of the surface of the building membrane 1 using a laser displacement sensor 19 during the load application process.

[0062] Step S6: Based on the X1 and X3 data stored in the computer 21, import the finite element model 27, and according to the numerical analysis results, carry out safety evaluation of the building membrane 1 before and after corrosion.

Claims

1. A device for testing the performance of architectural membranes in simulated corrosive environments, for the purpose of performance testing and safety evaluation of architectural membranes, characterized in that: The application relates to a building film tensile testing device which comprises a film material tensile device, an artificial simulated corrosion device and a data acquisition system; the film material tensile device is used for fixing a building film to be tested and applying a tensile force to the film during testing; the artificial simulated corrosion device comprises a control module and a booster water pump and ultraviolet lamp connected to the control module; the control module simulates a film corrosion aging environment by quantitatively opening and closing the booster water pump and the ultraviolet lamp during testing; and the data acquisition system comprises a laser displacement sensor which monitors the deformation of a mark point on the building film in the simulated film corrosion aging environment and forms testing data. The film material tensile device comprises an upper convex clamping plate (2) and a lower concave clamping plate (3) used for fixing a rectangular building film (1); further comprises a slide rail support rod (4), a slide rail (5), a tensile force sensor (6) and a support frame body (7); small holes are uniformly drilled around the film; the upper convex clamping plate (2) and the lower concave clamping plate (3) are used for fixing the film by penetrating the small holes around the film with high-strength boundary bolts (8) during fixing of the film; and the four edges of the film are respectively fixed on the upper convex clamping plate (2) and the lower concave clamping plate (3). The mark point on the building film is a scattered light mark point (18) which can scatter light; The artificial simulated corrosion device comprises a salt solution storage tank (9), a booster water pump (10), a liquid delivery pipe (11), an atomizing nozzle (12), an ultraviolet lamp (13), an ultraviolet lamp cover (14), a controller (15), a support plate (16) and a support frame (17); the booster water pump (10) is connected to the salt solution storage tank (9); The booster water pump (10) is connected to the first end of the liquid delivery pipe (11); the liquid delivery pipe (11) is connected to a plurality of atomizing nozzles (12) which are directed to the building film to be tested; the ultraviolet lamp cover (14) is arranged outside the ultraviolet lamp (13); the controller is connected to the booster water pump (10) and the ultraviolet lamp (13); and the atomizing nozzles (12), the ultraviolet lamp (13) and the ultraviolet lamp cover (14) are fixed to the support plate (16); The support frame (17) is used for fixing the support plate (16), and the projection area of the support plate (16) on the ground is smaller than the surface area of the building film (1) to be tested; The support frame body (7) is composed of a top layer square steel pipe (7-1), a bottom layer square steel pipe (7-2), four corner square steel pipe columns (7-3), four corner inclined square steel pipes (7-4) and a bottom steel sheet (7-5). The upper convex clamping plate (2) and the lower concave clamping plate (3) are welded with a U-shaped lock buckle (22) at the middle position, the number of the upper convex clamping plate is two and they are parallel to each other, the number of the lower concave clamping plate is two and they are parallel to each other, the top layer square steel pipe (7-1) is welded with a tension female bolt (23) at the vertical position of the U-shaped lock buckle (22), the front and rear ends of the tension sensor (6) are respectively connected with a lifting ring, the front lifting ring (24-1) is connected with the U-shaped lock buckle (22), the rear lifting ring (24-2) is connected with the front end of a universal ring (25), the rear end of the universal ring (25) is connected with a tension male screw rod (26), the building membrane (1) is stretched by rotating the tension male screw rod (26) uniformly, the building membrane (1) forms a saddle shape in the stretching process due to the constraint of the upper convex clamping plate and the lower concave clamping plate, and the tension value in the stretching process is monitored by the tension sensor (6); The slide rail support rod (4) is connected with the slide rail (5) and the upper convex clamping plate (2) and the lower concave clamping plate (3), the slide rail support rod is placed at the slide rail with the bottom sheet body sliding, when the building membrane (1) is stretched, the slide rail (5) constrains the building membrane (1) to move in the stretching direction.

2. The simulated environmental architectural film performance testing device of claim 1, wherein: The four-corner square steel pipe column (7-3) is welded with a support frame (17), and the support frame (17) is welded with a support plate (16).

3. The simulated environmental architectural film performance testing apparatus of claim 1, wherein: The salt solution storage tank (9) outputs the corrosion salt solution to the booster water pump (10), and the booster water pump outputs the quantitative corrosion salt solution to the measured building membrane through the infusion tube and the spray according to the instruction of the control module.

4. The simulated environmental architectural film performance testing apparatus of claim 1, wherein: The controller is used for timing and quantitative control of the ultraviolet lamp tube (13) and the booster water pump (10) to open to spray and ultraviolet aging test on the membrane.

5. The safety evaluation method of the simulated corrosion environment building membrane structure performance testing device, using the simulated corrosion environment building membrane structure performance testing device of claim 1, characterized in that: The method comprises the following steps: Step S1: a plurality of astigmatism mark points (18) are pasted on the surface of the building membrane (1), a laser displacement sensor (19) is used to test the distance X1 from the uncorroded building membrane (1), and the test data is transmitted to a computer (21) for storage; Step S2: the ultraviolet lamp tube (13) and the booster water pump (10) are turned on to spray and ultraviolet aging test on the membrane; Step S3: the laser displacement sensor (19) is used to test the astigmatism mark points (18) pasted on the surface of the building membrane (1) after the aging test is completed, and the deformation data X2 of the building membrane (1) after corrosion and aging is obtained; Step S4: based on the X1 and X2 data stored in the computer (21), a finite element model (27) of the building membrane (1) after corrosion is established, a plurality of load cases are simulated on the finite element model (27), the stress conditions of the building membrane (1) under different load states before and after corrosion are analyzed, and the safety of the building membrane (1) is evaluated according to the numerical analysis results.

6. The method for safety evaluation of the simulated corrosion environment building membrane structure performance test device according to claim 5, characterized in that: The method further comprises the following steps: Step S5: artificial weight blocks or small balls are used to apply static or dynamic load on the surface of the building membrane (1), and the laser displacement sensor (19) is used to monitor the deformation data X3 of the surface of the building membrane (1) during the load application process. Step S6: Based on the X1 and X3 data stored by the computer (21), the finite element model (27) is imported, and the safety assessment of the building membrane material (1) before and after corrosion is carried out according to the numerical analysis results.

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