Test method for combined bending-shear loading of beam webs

Abstract

The present invention belongs to the technical field of mechanical property testing and discloses a test method for composite bending and shear loading of beam webs. S1: Calculate the width of the upper and lower edge reinforcement plates at any position in the length direction of the test beam, and design and manufacture the upper and lower edge reinforcement plates based on the calculated widths; S2: Fix the upper and lower edge reinforcement plates to the upper and lower edge plates of the test beam respectively; S3: Fix the first end of the test beam, the upper and lower edge reinforcement plates on the same side to the fixed end; S4: Calculate the load force required to be applied by the loading assembly at the second end of the test beam; S5: Apply the load force to the second end of the test beam through the loading assembly. In the present invention, the upper and lower edge reinforcement plates are used to ensure uniform loading of the beam web of the test beam, accurately simulate the actual force of the beam web, accurately test and verify the beam web, and ensure the stability of the test beam in actual use.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical performance testing, in particular to a testing method for beam web bending-shear composite loading. Background Art

[0002] In aircraft manufacturing, key components require testing to ensure overall quality. The horizontal stabilizer beam web structure, a key component of an aircraft, requires composite loading testing. Prior art testing protocols for composite bending and shear loading of beam web structures typically test the entire test beam (including the beam web, the upper and lower flanges connected to the upper and lower ends of the beam web). This results in uneven loading (shear force and bending moment) in the beam web region, making it impossible to accurately simulate the loading in the beam web region and, consequently, to accurately verify the beam web. Summary of the Invention

[0003] The object of the present invention is to provide a test method for beam web bending-shear combined loading, which can accurately simulate the loading of the beam web and accurately test and verify the performance of the beam web.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A test method for beam webs subjected to combined bending and shear loading is used to verify the performance of the beam web of a test beam. The length of the test beam is set to X, and the upper and lower edge reinforcement plates are fixedly connected to the upper and lower edge plates of the test beam, respectively. The test method for beam webs subjected to combined bending and shear loading comprises the following steps:

[0006] S1, calculate the width b of the upper edge reinforcement plate and the lower edge reinforcement plate at any position along the length direction of the test beam X , according to the calculated number of b X and designing and manufacturing the upper edge reinforcement plate and the lower edge reinforcement plate;

[0007] S2, fixing the manufactured upper edge reinforcement plate and the manufactured lower edge reinforcement plate to the upper edge plate and the manufactured lower edge plate respectively;

[0008] S3, fixing the first ends of the test beam, the upper edge reinforcement plate, and the lower edge reinforcement plate on the same side to a fixed end;

[0009] S4, calculating the load force that the loading assembly needs to apply to the second end of the test beam based on the actual load on the beam web;

[0010] S5, applying a load force to the second end of the test beam through the loading assembly to verify whether the beam web can meet the use requirements.

[0011] As an optional solution, in step S1,

[0012] b X =EI spar *F Z0 X / 2Eth2 / M Y-spar +b0;

[0013] Among them, EI spar is the bending stiffness of the test beam, F Z0 is the load that the first end of the test beam is required to withstand, E is the elastic modulus, t is the thickness of the upper edge reinforcement plate or the lower edge reinforcement plate, h is the height of the test beam, M Y-spar is the bending moment borne by the web of the beam at any position along its length direction, and b0 is the width of the upper edge reinforcement plate and the lower edge reinforcement plate when x=0.

[0014] As an optional solution, in step S4,

[0015] The load force applied by the loading assembly to the second end of the test beam includes F1 and F2 applied in opposite directions perpendicular to the upper edge plate and the lower edge plate, and the distance between the force application point at F1 and the second end of the test beam is L1, and the distance between the force application point at F2 and the second end of the test beam is L2, F1=(M Y0 -F Z0 L2) / (L2-L1), F2=(M Y0 -F Z0 L1) / (L2-L1);

[0016] Among them, M Y0 The first end of the test beam is required to withstand the bending moment.

[0017] As an optional solution, in step S1, b X The derivation process is as follows:

[0018] The shear force F that the test beam bears at any position along its length Z and bending moment M Y They are,

[0019] F Z =F Z0 ,

[0020] M Y＝ M Y0 +F Z0 X, where F Z0 and M Y0 are the loads required at the first end of the test beam, respectively;

[0021] Since the shear force is mainly transmitted by the beam web, the shear force F borne by any position of the beam web along its length is Z-spar =F Z0 ;

[0022] The bending moment M at any position along the length of the beam web is Y-spar for,

[0023] M Y-spar =(M Y *EI spar ) / (EI spar +2Eb X th2)=(M Y0 +F Z0 X)*EI spar / (EI spar +2Eb X th2),

[0024] Therefore, it can be concluded that M Y0 =M Y-spar +2Eb X th 2*M Y-spar / EI spar -F Z0 X, set 2Eb X th 2*M Y-spar / EI spar -F Z0 X=C, C is a constant, and further we can conclude that b X =EI spar *(C+F Z0 X) / 2Eth2 / M Y-spar ;

[0025] When X=0, b0=EI spar *C / 2Eth2 / M Y-spar , we get C = 2Eth2*b0*M Y-spar / EI spar ;

[0026] Finally, b X =EI spar *F Z0 X / 2Eth2 / M Y-spar +b0.

[0027] As an optional solution, in step S4, the derivation process of F1 and F2 is as follows:

[0028] F Z0 =F2-F1,

[0029] M Y0=F2*L2-F1*L1;

[0030] It is concluded that F1=(M Y0 -F Z0 L2) / (L2-L1), F2=(M Y0 -F Z0 L1) / (L2-L1).

[0031] As an optional solution, in step S4, the loading assembly includes a loading plate, a connecting belt plate, an upper loading ear plate and a lower loading ear plate, the connecting belt plate is connected between the loading plate and the second end of the beam web, the second end of the upper edge reinforcement plate and the second end of the lower edge reinforcement plate are respectively connected to the upper surface and lower surface of the loading plate, the upper loading ear plate is connected to the loading plate and is located on the upper side of the loading plate, the lower loading ear plate is connected to the loading plate and is located on the lower side of the loading plate, and the distance between the force application point of the upper loading ear plate and the end face of the second end of the test beam is L2, and the distance between the force application point of the lower loading ear plate and the end face of the second end of the test beam is L1.

[0032] As an optional solution, the loading assembly further includes an anti-torsion bar, wherein the anti-torsion bar is configured to abut against the loading plate to prevent the loading plate from twisting.

[0033] As an optional solution, two groups of anti-torsion bars are provided, and the two groups of anti-torsion bars are respectively in contact with two side surfaces of the loading plate in a direction perpendicular to the beam web.

[0034] As an optional solution, in step S3, the fixed end includes a fixed plate, an upper connecting angle plate, a lower connecting angle plate and a side connecting angle plate, and step S3 is specifically as follows:

[0035] The beam web is connected to the fixed plate through the side connecting angle plate, the upper edge reinforcement plate is connected to the fixed plate through the upper connecting angle plate, and the lower edge reinforcement plate is connected to the fixed plate through the lower connecting angle plate.

[0036] As an optional solution, before step S3, the fixing plate is first fixed to the load-bearing wall.

[0037] Beneficial effects of the present invention:

[0038] The present invention provides a test method for beam web bending shear combined loading, which calculates the structural dimensions b of the upper edge reinforcement plate and the lower edge reinforcement plate according to the actual load of the beam web of the test beam. X The upper and lower edge reinforcement plates are respectively provided on the upper and lower edge plates of the test beam to ensure that when the loading component applies the load, the web of the test beam is subjected to the bending moment M Y-sparand shear force F Z-spar The test method for combined bending and shear loading of beam webs in the present invention ensures uniform loading of the beam webs of the test beams through the upper and lower edge reinforcement plates, accurately simulates the actual loading of the beam webs, enables accurate test verification of the beam webs, and ensures the stability of the test beams in actual use. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a flow chart of a test method for beam web bending-shear combined loading provided by an embodiment of the present invention;

[0040] Figure 2 Schematic diagram of the structure of the test beam involved in the embodiment of the present invention;

[0041] Figure 3 1 is a schematic structural diagram of the connection between the test beam and the upper and lower edge reinforcement plates involved in an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the structure of the loading test device involved in the embodiment of the present invention. Figure 1 ;

[0043] Figure 5 This is a schematic diagram of the structure of the loading test device involved in the embodiment of the present invention. Figure 2 .

[0044] In the picture:

[0045] 100, test beam; 101, upper edge plate; 102, lower edge plate; 103, beam web;

[0046] 1. Upper edge reinforcement plate; 2. Lower edge reinforcement plate;

[0047] 3. Fixed end; 31. Fixed plate; 32. Upper connecting angle plate; 33. Lower connecting angle plate; 34. Side connecting angle plate;

[0048] 4. Loading assembly; 41. Loading plate; 42. Connecting belt plate; 43. Upper loading lug plate; 44. Lower loading lug plate; 45. Anti-torsion bar. DETAILED DESCRIPTION

[0049] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0050] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, mechanical or electrical connections, direct or indirect connections through an intermediate medium, and internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0051] In the description of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0052] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0053] The embodiment of the present invention provides a test method for beam web bending shear combined loading, which is used to verify the performance of the beam web 103 of the test beam 100. The length of the test beam 100 is set to X. When the test beam 100 is actually used, the beam web 103 is subjected to a bending moment M. Y-spar and shear force F Z-spar In order to ensure that the designed beam web 103 can withstand the above bending moment M Y-spar and shear force F Z-spar Before assembling the test beam 100 to actual application, the performance of the beam web 103 needs to be verified. The test method for the beam web bending-shear combined loading can be applied to the loading test device, such as Figure 2-Figure 5 As shown, the loading test device includes a fixed end 3, an upper edge reinforcement plate 1, a lower edge reinforcement plate 2 and a loading assembly 4. The first end of the test beam 100 is fixedly connected to the fixed end 3, the upper edge reinforcement plate 1 is fixedly connected to the upper edge plate 101 of the test beam 100, and the lower edge reinforcement plate 2 is fixedly connected to the lower edge plate 102 of the test beam 100. The loading assembly 4 is used to apply the required load force to the second end of the test beam 100. Before use, the loading test device needs to be designed with the following parameters based on the structural dimensions of the test beam 100 and the actual load borne by the test beam 100: 1) The width b of the upper edge reinforcement plate 1 and the lower edge reinforcement plate 2 X ; 2) The load force applied by the loading component 4.

[0054] In order to obtain the above parameters, Figure 1 As shown, the test method for beam web bending-shear combined loading includes the following steps:

[0055] S1, according to the actual bending moment M of the beam web 103 Y-spar and shear force F Z-spar Calculate the width b of the upper edge reinforcement plate 1 and the lower edge reinforcement plate 2 at any position along the length direction (X-axis direction) of the test beam 100 X (dimensions along the Y axis), and several b are obtained based on the calculation X Design and manufacture the upper edge reinforcement plate 1 and the lower edge reinforcement plate 2 to obtain the required width dimensions;

[0056] S2, the upper edge reinforcement plate 1 and the lower edge reinforcement plate 2 are fixedly connected to the upper edge plate 101 and the lower edge plate 102 of the test beam 100 respectively. When the loading assembly 4 applies a load force to the second end of the test beam 100, the upper edge reinforcement plate 1 and the lower edge reinforcement plate 2 can ensure that the web 103 of the test beam 100 is subjected to the bending moment M Y-spar and shear force F Z-spar The force is consistent with the actual force, and the force is uniform and accurate;

[0057] S3, fixing the first ends of the test beam 100, the upper edge reinforcement plate 1, and the lower edge reinforcement plate 2 on the same side to the fixed end 3, so as to facilitate the loading assembly 4 to apply a load force to the second end of the test beam 100;

[0058] S4, according to the actual load of the web 103 of the test beam 100, calculate the load force that the loading assembly 4 needs to apply to the second end of the test beam 100, and according to the bending moment M that the web 103 of the test beam 100 is subjected to in actual use Y-spar and shear force F Z-spar Calculate the load force applied by the loading assembly 4 to ensure that when the loading assembly 4 applies the load force, the web 103 of the test beam 100 is subjected to a bending moment M Y-spar and shear force F Z-spar are consistent with the actual load;

[0059] S5 , applying a load force to the second end of the test beam 100 through the loading assembly 4 to verify whether the beam web 103 of the test beam 100 can meet the use requirements.

[0060] The test method for combined bending and shear loading of the beam web in the present invention ensures uniform loading of the beam web 103 of the test beam 100 through the upper edge reinforcement plate 1 and the lower edge reinforcement plate 2, accurately simulates the actual force of the beam web 103, can accurately test and verify the beam web 103, and ensure the stability of the test beam 100 in actual use.

[0061] In step S1, b X =EI spar *F Z0 X / 2Eth2 / M Y-spar +b0; where, EI spar is the bending stiffness (known value) of the test beam 100 at any position along its length (i.e., any cross-sectional position along the X-axis), F Z0 is the load that the first end of the test beam 100 is required to withstand (a known value), E is the elastic modulus, t is the thickness of the upper edge reinforcement plate 1 or the lower edge reinforcement plate 2 along the Z axis (generally designed to be 5 mm), h is the height of the test beam 100 along the Z axis (which can be measured), and M Y-spar is the bending moment (a known value) borne by the web 103 at any position along its length (i.e., any cross section along the X-axis), and b0 is the cross-sectional width of the upper and lower edge reinforcing plates 1 and 2 at x = 0 (b0 can be designed to be 1.5 times the width of the upper and lower edge reinforcing plates 101 and 102). This formula can be used to calculate the width of the upper and lower edge reinforcing plates 1 and 2, and thus determine their structural design parameters.

[0062] In this embodiment, the upper edge reinforcement plate 1 is fixedly connected to the upper edge plate 101 by a plurality of screws, and the lower edge reinforcement plate 2 is fixedly connected to the lower edge plate 102 by a plurality of screws.

[0063] In step S4, refer to Figure 4 and combined Figure 5 The loading assembly 4 includes a loading plate 41, a connecting strip plate 42, an upper loading ear plate 43 and a lower loading ear plate 44. The connecting strip plate 42 is connected between the loading plate 41 and the second end of the beam web 103. In this embodiment, two connecting strip plates 42 can be provided. The two connecting strip plates 42 are simultaneously connected to the loading plate 41 and the beam web 103 on both sides along the Y-axis direction (i.e., perpendicular to the direction of the beam web 103). The second end of the upper edge reinforcement plate 1 is connected to the loading plate 41 along the Z-axis direction. The upper surface of the lower edge reinforcement plate 2 is connected to the lower surface of the loading plate 41 along the Z-axis direction. The upper loading lug plate 43 is provided on the upper side of the loading plate 41, and the distance between the connection point (i.e., the force application point) of the upper loading lug plate 43 and the loading plate 41 and the end surface of the second end of the test beam 100 is L2. The lower loading lug plate 44 is provided on the lower side of the loading plate 41, and the distance between the connection point (i.e., the force application point) of the lower loading lug plate 44 and the loading plate 41 and the end surface of the second end of the test beam 100 is L1. Therefore, the upper loading lug plate 43 and the lower loading lug plate 44 respectively apply load forces F2 and F1 to form the load force applied by the loading assembly 4 to the second end of the test beam 100. F2 is upward along the Z-axis direction, and F1 is downward along the Z-axis direction. F1 = (M Y0 -FZ0 L2) / (L2-L1), F2=(M Y0 -F Z0 L1) / (L2-L1); where M Y0 is the bending moment (known value) that the first end of the test beam 100 is required to withstand. The load forces F2 and F1 that need to be applied can be calculated using the above formula to meet the actual force requirements of the beam web 103.

[0064] The connection between the connecting strip 42 and the second end of the loading plate 41 and the beam web 103, the connection between the second end of the upper edge reinforcement plate 1 and the loading plate 41, and the connection between the second end of the lower edge reinforcement plate 2 and the loading plate 41 all use multiple screws.

[0065] To further explain the formula, b X The derivation process is as follows:

[0066] First of all, it should be noted that, referring to Figure 2 and Figure 3 , the bending moment M at any position on the beam web 103 along its length Y-spar and shear force F Z-spar are all known values, and the bending moment M of the cross section at each position Y-spar are the same, the shear force F of the cross section at each position Z-spar are the same, therefore, it is necessary to design the upper edge reinforcement plate 1 and the lower edge reinforcement plate 2 to ensure that the bending moment M of the cross section at each position on the beam web 103 Y-spar and shear force F Z-spar Same as actual load.

[0067] The shear force F that the test beam 100 bears at any position along its length is Z and bending moment M Y They are:

[0068] F Z =F Z0 ;

[0069] M Y =M Y0 +F Z0 X, where F Z0 and M Y0 are respectively the shear force and bending moment required at the first end of the test beam 100, both of which are known values;

[0070] The shear force is mainly transmitted by the beam web 103. The shear force transmitted by the upper edge reinforcement plate 1 and the lower edge reinforcement plate 2 is relatively small and is not considered to affect the shear force distribution of the cross section of the beam web 103. Therefore, the shear force F borne by any cross section of the beam web 103 on the X axis is Z-spar =F Z0 ;

[0071] The bending moment load borne by the web 103 at any position along its length (i.e., any cross section on the X axis) is, M Y-spar =(M Y *EI spar ) / {EIspar+2(Eb X t3 / 12+Eb X th2)}, due to the bending stiffness Eb X t3 / 12 compared to Eb X th2 is a smaller amount, so Eb can be ignored X t3 / 12, and then we can conclude that M Y-spar =(M Y *EI spar ) / (EI spar +2Eb X th2), M Y =M Y0 +F Z0 Substituting X into the above formula, we can get M Y-spar =(M Y0 +F Z0 X)*EI spar / (EI spar +2Eb X th2), and then further deduce M Y0 =M Y-spar +(2Eb X th2*M Y-spar / EI spar )-F Z0 X, to ensure the bending moment M of the cross section at each position of the beam web 103 Y-spar If it does not change, you need to ensure 2Eb X th2*M Y-spar / EI spar -F Z0 X is a constant, set 2Eb X th2*M Y-spar / EI spar -F Z0 X is equal to the constant C, and further, b X =EI spar *(C+F Z0 X) / 2Eth2 / M Y-spar ; When X = 0, b0 = EI spar *C / 2Eth2 / M Y-spar , we get C = 2Eth2*b0*M Y-spar / EI spar Finally, b X =EI spar *FZ0 X / 2Eth2 / M Y-spar +b0.

[0072] The derivation process of F1 and F2 is as follows:

[0073] F Z0 =F2-F1;

[0074] M Y0 =F2*L2-F1*L1; and then we can conclude that F1=(M Y0 -F Z0 L2) / (L2-L1), F2=(M Y0 -F Z0 L1) / (L2-L1).

[0075] In this embodiment, the upper loading lug plate 43 and the lower loading lug plate 44 are respectively connected to the actuator, and the actuator can load the loading plate 41 through the upper loading lug plate 43 and the lower loading lug plate 44 .

[0076] Furthermore, the loading assembly 4 further includes an anti-twist rod 45 , which can abut against the loading plate 41 to prevent the loading plate 41 from twisting.

[0077] Two groups of anti-torsion bars 45 are provided, and the two groups of anti-torsion bars 45 are respectively abutted against the two sides of the reinforcing plate along the Y-axis direction. The number of anti-torsion bars 45 contained in each group of anti-torsion bars 45 is four. Four anti-torsion bars 45 are respectively used to abut against the two sides of the loading plate 41 along the Y-axis direction, and the anti-torsion effect is stronger.

[0078] In step S3, the fixed end 3 includes a fixed plate 31, an upper connecting angle plate 32, a lower connecting angle plate 33 and a side connecting angle plate 34. Step S3 is specifically as follows: the beam web 103 is connected to the fixed plate 31 through the side connecting angle plate 34. Two side connecting angle plates 34 can be provided, one side connecting angle plate 34 is connected between the fixed plate 31 and one side of the beam web 103, and the other side connecting angle plate 34 is connected between the fixed plate 31 and the other side of the beam web 103. The upper edge reinforcement plate 1 is connected to the fixed plate 31 through the upper connecting angle plate 32, and the lower edge reinforcement plate 2 is connected to the fixed plate 31 through the lower connecting angle plate 33. The above connections can also be fixed by multiple screws.

[0079] In order to further prevent the transition sections at both ends of the test beam 100 from being damaged, the web 103 of the test beam 100 is provided with first reinforcing plates on both side surfaces of the first end, and second reinforcing plates are provided on both side surfaces of the second end. One first reinforcing plate is sandwiched between one side surface of the first end of the web 103 and a side connecting angle plate 34, another first reinforcing plate is sandwiched between the other side surface of the first end of the web 103 and the other side connecting angle plate 34, one second reinforcing plate is sandwiched between one side surface of the second end of the web 103 and a connecting strip plate 42, and another second reinforcing plate is sandwiched between the other side surface of the second end of the web 103 and the other connecting strip plate 42.

[0080] Before performing step S3 , the fixing plate 31 is first fixed to the load-bearing wall to facilitate the loading assembly 4 to apply the load force to the test beam 100 .

[0081] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Test method for combined bending and shear loading of beam webs, characterized in that: For verifying the performance of a beam web (103) of a test beam (100), the length of the test beam (100) is set to X, an upper edge reinforcement plate (1) and a lower edge reinforcement plate (2) are fixedly connected to the upper edge plate (101) and the lower edge plate (102) of the test beam (100), respectively. The test method for the beam web bending-shear combined loading comprises the following steps: S1, calculate the width b of the upper edge reinforcement plate (1) and the lower edge reinforcement plate (2) at any position along the length direction of the test beam (100) X , according to the calculated number of b X Design and manufacture the upper edge reinforcement plate (1) and the lower edge reinforcement plate (2), b X =EI spar *F Z0X / 2Eth 2 / M Y-spar +b0; Among them, EI spar is the bending stiffness of the test beam (100), F Z0 is the load force that the first end of the test beam (100) is required to withstand, E is the elastic modulus, t is the thickness of the upper edge reinforcement plate (1) or the lower edge reinforcement plate (2), h is the height of the test beam (100), M Y-spar is the bending moment borne by the beam web (103) at any position along its length direction, and b0 is the width of the upper edge reinforcement plate (1) and the lower edge reinforcement plate (2) when x=0; S2, fixing the manufactured upper edge reinforcement plate (1) and the lower edge reinforcement plate (2) to the upper edge plate (101) and the lower edge plate (102) respectively; S3, fixing the first ends of the test beam (100), the upper edge reinforcement plate (1), and the lower edge reinforcement plate (2) on the same side to a fixed end (3); S4, calculating the load force that the loading assembly (4) needs to apply to the second end of the test beam (100) based on the actual load on the beam web (103); S5, applying a load force to the second end of the test beam (100) through the loading assembly (4) to verify whether the beam web (103) can meet the use requirements.

2. The test method for beam web bending-shear combined loading according to claim 1, characterized in that: In step S4, The load force applied by the loading assembly (4) to the second end of the test beam (100) includes F1 and F2 applied in opposite directions in a direction perpendicular to the upper edge plate (101) and the lower edge plate (102), and the distance between the force application point at F1 and the second end of the test beam (100) is L1, and the distance between the force application point at F2 and the second end of the test beam (100) is L2, and F1=(M Y0 -F Z0 L2) / (L2-L1), F2=(M Y0 -F ZO L1) / (L2-L1); Among them, M Y0 The first end of the test beam (100) is required to withstand a bending moment.

3. The test method for beam web bending-shear combined loading according to claim 2, characterized in that: In step S1, b X The derivation process is as follows: The shear force F borne by the test beam (100) at any position along its length direction Z and bending moment M Y They are, F Z =F Z0 , MY=M Y0 +F Z0 X, where F Z0 and M Y0 are the loads required at the first end of the test beam (100); Since the shear force is mainly transmitted by the beam web (103), the shear force F borne by any position of the beam web (103) along its length direction is Z-spar =F Z0 ; The bending moment M borne by any position of the beam web (103) along its length direction is Y-spar for, M Y-spar =(M Y *EI spar ) / (EI spar +2Eb x th 2 )=(M Y0 +F Z0 X)*EI spar / (EI spar +2Eb x th 2 ), Therefore, it can be concluded that M Y0 =M Y-spar +2Eb x th 2 *M Y-spar / EI spar -F Z0 X, set 2Eb x th 2 *M Y-spar / EI spar -F Z0 X=C, C is a constant, and further we can conclude that b X =EI spar *(C+F Z0 X) / 2Eth 2 / M Y-spar ; When X=0, b0=EI spar *C / 2Eth 2 / M Y-spar , we get C = 2Eth 2 *b0*M Y-spar / EI spar ; Finally, b x =EI spar *F Z0 X / 2Eth 2 / M Y-spar +b0.

4. The test method for beam web bending-shear combined loading according to claim 3, characterized in that: In step S4, the derivation process of F1 and F2 is as follows: F Z0 =F2-F1, <h2 style=";text-align:left;direction:ltr">M<h2 style=";text-align:left;direction:ltr"> Y0 <h2 style=";text-align:left;direction:ltr"> =F2*L2-F1*L1; It is concluded that F1=(M Y0 -F Z0 L2) / (L2-L1), F2=(M Y0 -F Z0 L1) / (L2-L1).

5. The test method for beam web bending-shear combined loading according to claim 2, characterized in that: In step S4, the loading assembly (4) includes a loading plate (41), a connecting strip plate (42), an upper loading ear plate (43) and a lower loading ear plate (44), wherein the connecting strip plate (42) is connected between the loading plate (41) and the second end of the beam web (103), the second end of the upper edge reinforcement plate (1) and the second end of the lower edge reinforcement plate (2) are respectively connected to the upper surface and the lower surface of the loading plate (41), the upper loading ear plate (43) is connected to the loading plate (41) and is located on the upper side of the loading plate (41), the lower loading ear plate (44) is connected to the loading plate (41) and is located on the lower side of the loading plate (41), and the distance between the force application point of the upper loading ear plate (43) and the end face of the second end of the test beam (100) is L2, and the distance between the force application point of the lower loading ear plate (44) and the end face of the second end of the test beam (100) is L1.

6. The test method for beam web bending-shear combined loading according to claim 5, characterized in that: The loading assembly (4) further includes an anti-twist bar (45) configured to abut against the loading plate (41) to prevent the loading plate (41) from twisting.

7. The test method for beam web bending-shear combined loading according to claim 6, characterized in that: Two groups of anti-twist bars (45) are provided, and the two groups of anti-twist bars (45) respectively abut against two side surfaces of the loading plate (41) in a direction perpendicular to the beam web (103).

8. The test method for beam web bending-shear combined loading according to claim 1, characterized in that: In step S3, the fixed end (3) includes a fixed plate (31), an upper connecting angle plate (32), a lower connecting angle plate (33) and a side connecting angle plate (34). Step S3 is specifically as follows: The beam web (103) is connected to the fixed plate (31) through the side connecting angle plate (34), the upper edge reinforcing plate (1) is connected to the fixed plate (31) through the upper connecting angle plate (32), and the lower edge reinforcing plate (2) is connected to the fixed plate (31) through the lower connecting angle plate (33).

9. The test method for beam web bending-shear combined loading according to claim 8, characterized in that: Before step S3, the fixing plate (31) is first fixed to the load-bearing wall.

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