Bridge stand column protection method and system based on LS-DYNA and storage medium

Abstract

The invention provides an LS-DYNA-based bridge stand column protection method and system and a storage medium, and the method comprises the steps: carrying out the numerical simulation based on LS-DYNA, and obtaining a corresponding model between the penetration depth of a falling stone impacting a stand column and the falling stone impact energy; the maximum penetration depth of the column impacted by the falling rocks is obtained according to the falling rock data and the corresponding model among the penetration depth of the bridge column with the protective steel plate, the falling rock impact energy and the thickness of the protective steel plate, and whether protection needs to be additionally arranged on the bridge column or not is judged by combining the maximum allowable penetration depth of the bridge column; when protection needs to be additionally arranged on the bridge stand column, the minimum thickness of the protection steel plate is obtained according to the maximum permissible penetration depth and rockfall data of the bridge stand column; and rockfall impact disaster protection is conducted on the bridge stand column according to the minimum thickness of the protection steel plate. Corresponding steel plate protection can be adopted for the bridge stand column according to the minimum thickness of the bridge stand column protection steel plate, and high reliability and rapidity are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge column protection, and in particular relates to a bridge column protection method, system and storage medium based on LS-DYNA. Background Art

[0002] With the advancement of technology and the expansion of construction scale, the construction and development of bridges in mountainous areas have achieved remarkable results, playing an extremely important role in transportation, economic development, social connections, disaster prevention and rescue, etc.

[0003] During the use of bridges in mountainous areas, especially in bridge-tunnel projects, rocks often fall from the slopes and hit bridge columns, causing impact on the bridge columns, which may cause damage to structural components such as bridge columns and may even cause bridge collapse, posing a serious threat to the bridge structure, traffic safety, and the safety of life and property of people.

[0004] At present, bridge columns in the rockfall impact zone of bridges in mountainous areas generally do not adopt special protection methods, and safety hazards often occur during long-term use. Summary of the invention

[0005] In order to solve the technical problem in the background technology that there is a lack of a special protection method for bridge columns in the rockfall impact area, the present invention provides a bridge column protection method, system and storage medium based on LS-DYNA.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a bridge column protection method based on LS-DYNA, comprising:

[0008] S1: Data collection, obtaining rockfall data and the maximum permissible penetration depth of bridge columns [P cz ];

[0009] S2: Based on the rockfall data, combined with the penetration depth P of the rockfall hitting the column cz The impact energy of rockfall E cs The corresponding model between them is used to calculate the maximum penetration depth P of the falling rock hitting the column. czmax ; Wherein, the penetration depth P of the falling rock hitting the column cz The impact energy of rockfall E cs The corresponding models between them are obtained based on LS-DYNA numerical simulation;

[0010] S3: Based on the penetration depth of the rockfall hitting the column and the maximum permissible penetration depth of the bridge column [P cz ], to determine whether additional protection is needed for bridge columns;

[0011] S4: If additional protection is required for bridge columns, the maximum permissible penetration depth of the bridge columns [P cz ], rockfall data and the penetration depth P of bridge columns with protective steel plates sz The impact energy of rockfall E cs , protective steel plate thickness S t The corresponding model between the three is used to calculate the minimum thickness of the protective steel plate; wherein, the penetration depth P of the bridge column with the protective steel plate is sz The impact energy of rockfall E cs , protective steel plate thickness S t The corresponding models among the three are obtained based on LS-DYNA numerical simulation;

[0012] S5: Protect bridge columns from rockfall impact disasters based on the minimum thickness of the protective steel plate.

[0013] Optionally, the rockfall data in step S1 includes: the mass m of the rockfall, the impact velocity v of the rockfall, and the angle θ between the impact velocity of the rockfall and the horizontal direction.

[0014] Optionally, the step S2 specifically includes:

[0015] S2.1: Select the bridge column structure and carry out the rockfall impact energy E cs and column penetration depth P cz The penetration depth P of the rockfall impacting the column is obtained by using the LS-DYNA numerical simulation orthogonal test. cz The impact energy of rockfall E cs The corresponding model between

[0016] S2.2: Based on the penetration depth P of the rockfall impacting the column cz The impact energy of rockfall E cs The corresponding model and rockfall data are used to obtain the maximum energy E of the rockfall hitting the column. csmax and the maximum penetration depth P of the rockfall impacting the column czmax .

[0017] Optionally, in step S2,

[0018] Rockfall impact energy E cs =0.5m*(vcosθ) 2 / 1000, where v is the impact velocity of the rockfall, θ is the angle between the impact velocity of the rockfall and the horizontal direction, and m is the mass of the rockfall;

[0019] The penetration depth P of the rockfall hitting the column cz The impact energy of rockfall E cs The corresponding model between them is:

[0020] P cz =-0.62427+0.12999*In(E cs +190.97661),

[0021] Among them, E cs The impact energy of falling rocks.

[0022] Optionally, in step S3, if the maximum penetration depth P of the rockfall hitting the column is czmax Greater than the maximum permissible penetration depth of the bridge column [P cz ], the judgment result is that it is necessary to add protection to the bridge columns;

[0023] If the maximum penetration depth of the rockfall into the column is P cz Less than or equal to the maximum permissible penetration depth of the bridge column [P cz ], the judgment result is that there is no need to add protection for the bridge columns.

[0024] Optionally, the step S4 includes:

[0025] S4.1: According to the bridge column structure, carry out the impact energy E of rockfall cs , protective steel plate thickness S t And the penetration depth P of the bridge column with protective steel plate sz The penetration depth P of the bridge column with protective steel plate is obtained by LS-DYNA numerical simulation orthogonal test. sz The impact energy of rockfall E cs , protective steel plate thickness S t The correspondence model between the three;

[0026] S4.2: If the judgment result is that additional protection is needed for the bridge column, according to the penetration depth P of the bridge column with protective steel plate, sz The impact energy of rockfall E cs , protective steel plate thickness S t The corresponding model between the three, and the maximum penetration depth P of the falling rock hitting the column czmax , the maximum energy of the rockfall hitting the column E csmax and the maximum permissible penetration depth of bridge columns [P cz ], calculate the minimum steel plate protection thickness S tmin .

[0027] Optionally, in step S4, the penetration depth P of the bridge column with a protective steel plate is sz The impact energy of rockfall E cs , Steel plate protection thickness S t The corresponding model between the three was obtained by statistical fitting using Origin mathematical software, where

[0028] P sz =-0.06781+0.18494*exp(E cs / 1097.527)*exp(-S t / 19.167), P sz is the penetration depth of the bridge column with protective steel plate, E cs is the rockfall impact energy, S t The thickness of the protective steel plate.

[0029] Optionally, in step S4.2, the minimum steel plate protection thickness S tmin Correspondingly, the penetration depth P of the bridge column with protective steel plate sz Less than the maximum permissible penetration depth of the bridge column [P cz ].

[0030] In a second aspect, the present invention also provides a bridge column protection system based on LS-DYNA, including a data acquisition unit, a simulation calculation unit, and an output unit;

[0031] The data unit is used to obtain rockfall data and the maximum permissible penetration depth of bridge columns [P cz ];

[0032] The calculation and judgment unit is used to calculate the penetration depth P of the rockfall impact column according to the rockfall data. cz The impact energy of rockfall E cs The corresponding model between them is used to calculate the maximum penetration depth P of the falling rock hitting the column. czmax ; According to the penetration depth of rockfall hitting the column and the maximum permissible penetration depth of the bridge column [P cz ], determine whether it is necessary to add protection to the bridge column; if it is necessary to add protection to the bridge column, then according to the maximum allowable penetration depth of the bridge column [P cz ], rockfall data and the penetration depth P of bridge columns with protective steel plates sz The impact energy of rockfall E cs , protective steel plate thickness S t The corresponding model between the three is used to calculate the minimum thickness of the protective steel plate;

[0033] The output unit is used to output the minimum thickness of the protective steel plate.

[0034] In a third aspect, the present invention provides a storage medium storing instructions, wherein the instructions are generated by any of the above-mentioned bridge column protection methods based on LS-DYNA.

[0035] The beneficial effects of the present invention are:

[0036] The present invention provides a bridge column protection method based on LS-DYNA, which performs numerical simulation based on LS-DYNA to obtain the penetration depth P of the falling rock hitting the column. cz The impact energy of rockfall E cs The corresponding model between the two, and the penetration depth P of the bridge column with protective steel plate sz The impact energy of rockfall E cs , protective steel plate thickness S t The correspondence model between the three can be used to obtain the maximum penetration depth P of the rockfall impact column based on the rockfall data. czmax , combined with the maximum permissible penetration depth of the bridge column [P cz ], judge whether it is necessary to add protection to the bridge column; if it is necessary to add protection to the bridge column, then according to the maximum allowable penetration depth of the bridge column [P cz ], rockfall data, calculate the minimum thickness of the protective steel plate; and protect the bridge column from rockfall impact disasters according to the minimum thickness of the protective steel plate. The bridge column protection method based on LS-DYNA provided by the present invention can obtain the minimum thickness of the bridge column protective steel plate based on LS-DYNA numerical simulation, combined with the rockfall data and maximum penetration depth of the bridge column, so that the corresponding steel plate protection can be adopted for the bridge column according to the minimum thickness of the bridge column protective steel plate, which has high reliability and rapidity.

[0037] At the same time, the present invention also provides a bridge column protection system based on LS-DYNA, which can obtain the minimum thickness of the bridge column protection steel plate based on LS-DYNA numerical simulation and combined with the rockfall data and maximum penetration depth of the bridge column, so as to take corresponding steel plate protection for the bridge column, with high reliability and rapidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic diagram of a bridge column protection method based on LS-DYNA in the present invention;

[0039] Figure 2 is a schematic diagram of a bridge column structure selected in the present invention;

[0040] Figure 3 It is a schematic diagram of the calculation model when the bridge column selected in the present invention has no protective steel plate;

[0041] Figure 4 It is a schematic diagram of the calculation model when the bridge column selected in the present invention has a protective steel plate;

[0042] Figure 5 The damage to the bridge columns and reinforcement after falling rocks at different speeds hit the bridge columns without protective steel plates in the present invention;

[0043] Figure 6 The damage to the bridge columns and reinforcement after falling rocks at different speeds hit the bridge columns when there is a protective steel plate in the present invention;

[0044] Figure 7 It is the stress diagram of the falling rock hitting the protective steel plate with a thickness of 10 mm at different speeds in the present invention;

[0045] Figure 8 It is the displacement change curve of rockfall impact when there is no protective steel plate in the present invention;

[0046] Fig. 9 This is the displacement change curve of rockfall impact when the thickness of the protective steel plate is 10 mm in the present invention;

[0047] Fig.10 The rockfall impact energy E is obtained by plotting the relationship between the rockfall impact energy and the penetration depth in the origin software. cs and the penetration depth P of the rockfall hitting the column cz relationship;

[0048] Fig.11 The present invention is directed to the working condition of adding a steel plate for protection, and plots a relationship curve diagram of the corresponding relationship among the rockfall impact energy, the steel plate setting thickness, and the penetration depth;

[0049] Fig.12 is the penetration depth P of the rockfall impacting the column in the present invention. cz The impact energy of rockfall E cs Validation scatter plot of the corresponding model;

[0050] Fig.13 is the penetration depth P of the bridge column with protective steel plate in the present invention. sz The impact energy of rockfall E cs , Steel plate protection thickness S t Validation scatter plot of the corresponding model among the three. DETAILED DESCRIPTION

[0051] The present invention provides a bridge column protection method, system and storage medium based on LS-DYNA. In order to facilitate the explanation of the bridge column protection method, system and storage medium based on LS-DYNA provided by the present invention, they are described below in conjunction with the drawings and embodiments.

[0052] Example 1

[0053] See also Figure 1 , showing a schematic diagram of a bridge column protection method based on LS-DYNA described in this application, including:

[0054] S1: Data collection, obtaining rockfall data and the maximum permissible penetration depth of bridge columns [P cz ].

[0055] Optionally, the rockfall data in the present invention includes: the mass m of the rockfall, the rockfall impact velocity v, and the angle θ between the rockfall impact velocity and the horizontal direction.

[0056] Specifically, the rockfall data in the present invention can be obtained through geological exploration data and field investigation.

[0057] S2: Based on the rockfall data, combined with the penetration depth P of the rockfall hitting the column cz The impact energy of rockfall E cs The corresponding model between them is used to calculate the maximum penetration depth P of the falling rock hitting the column. czmax ; Wherein, the penetration depth P of the falling rock hitting the column cz The impact energy of rockfall E cs The corresponding models are obtained based on LS-DYNA numerical simulation.

[0058] Optionally, step S2 in the present invention specifically includes:

[0059] S2.1: Select the bridge column structure and carry out the rockfall impact energy E cs and column penetration depth P cz The penetration depth P of the rockfall impacting the column is obtained by using the LS-DYNA numerical simulation orthogonal test. cz The impact energy of rockfall E cs The corresponding model between

[0060] S2.2: Based on the penetration depth P of the rockfall impacting the column cz The impact energy of rockfall E cs The corresponding model and rockfall data are used to obtain the maximum energy E of the rockfall hitting the column. csmax and the maximum penetration depth P of the rockfall impacting the column czmax .

[0061] Optionally, in step S2 of the present invention,

[0062] Rockfall impact energy E cs =0.5m*(vcosθ) 2 / 1000, where v is the impact velocity of the rockfall, θ is the angle between the impact velocity of the rockfall and the horizontal direction, and m is the mass of the rockfall;

[0063] The penetration depth P of the rockfall hitting the column cz The impact energy of rockfall E cs The corresponding model between them is:

[0064] Pcz =-0.62427+0.12999*In(E cs +190.97661),

[0065] Among them, E cs The impact energy of falling rocks.

[0066] S3: Based on the penetration depth of the rockfall hitting the column and the maximum permissible penetration depth of the bridge column [P cz ] to determine whether additional protection is needed for bridge columns.

[0067] Optionally, in step S3 of the present invention, if the maximum penetration depth P of the rockfall hitting the column is czmax Greater than the maximum permissible penetration depth of the bridge column [P cz ], the judgment result is that it is necessary to add protection to the bridge columns;

[0068] If the maximum penetration depth of the rockfall into the column is P cz Less than or equal to the maximum permissible penetration depth of the bridge column [P cz ], the judgment result is that there is no need to add protection for the bridge columns.

[0069] S4: If additional protection is required for bridge columns, the maximum permissible penetration depth of the bridge columns [P cz ], rockfall data and the penetration depth P of bridge columns with protective steel plates sz The impact energy of rockfall E cs , protective steel plate thickness S t The corresponding model between the three is used to calculate the minimum thickness of the protective steel plate; wherein, the penetration depth P of the bridge column with the protective steel plate is sz The impact energy of rockfall E cs , protective steel plate thickness S t The corresponding models among the three are obtained based on LS-DYNA numerical simulation.

[0070] Optionally, step S4 in the present invention includes:

[0071] S4.1: According to the bridge column structure, carry out the impact energy E of rockfall cs , protective steel plate thickness S t And the penetration depth P of the bridge column with protective steel plate sz The penetration depth P of the bridge column with protective steel plate is obtained by LS-DYNA numerical simulation orthogonal test. sz The impact energy of rockfall E cs , protective steel plate thickness S t The correspondence model between the three;

[0072] S4.2: If the judgment result is that additional protection is needed for the bridge column, according to the penetration depth P of the bridge column with protective steel plate, sz The impact energy of rockfall E cs , protective steel plate thickness S t The corresponding model between the three, and the maximum penetration depth P of the falling rock hitting the column czmax , the maximum energy of the rockfall hitting the column E csmax and the maximum permissible penetration depth of bridge columns [P cz ], calculate the minimum steel plate protection thickness S tmin .

[0073] Optionally, in step S4 of the present invention, the penetration depth P of the bridge column with the protective steel plate is sz The impact energy of rockfall E cs , Steel plate protection thickness S t The corresponding model between the three was obtained by statistical fitting using Origin mathematical software, where

[0074] P sz =-0.06781+0.18494*exp(E cs / 1097.527)*exp(-S t / 19.167), P sz is the penetration depth of the bridge column with protective steel plate, E cs is the rockfall impact energy, S t The thickness of the protective steel plate.

[0075] Optionally, in step S4.2 of the present invention, the minimum steel plate protection thickness S tmin Correspondingly, the penetration depth P of the bridge column with protective steel plate sz Less than the maximum permissible penetration depth of the bridge column [P cz ].

[0076] S5: Protect bridge columns from rockfall impact disasters based on the minimum thickness of the protective steel plate.

[0077] In this embodiment, numerical simulation is performed based on LS-DYNA to obtain the penetration depth P of the falling rock hitting the column. cz The impact energy of rockfall E cs The corresponding model between the two, and the penetration depth P of the bridge column with protective steel plate sz The impact energy of rockfall E cs , protective steel plate thickness S t The correspondence model between the three can be used to obtain the maximum penetration depth P of the rockfall impact column based on the rockfall data. czmax , combined with the maximum permissible penetration depth of the bridge column [P cz], judge whether it is necessary to add protection to the bridge column; if it is necessary to add protection to the bridge column, then according to the maximum allowable penetration depth of the bridge column [P cz ], rockfall data, calculate the minimum thickness of the protective steel plate; and protect the bridge column from rockfall impact disasters according to the minimum thickness of the protective steel plate. The bridge column protection method based on LS-DYNA provided by the present invention can obtain the minimum thickness of the bridge column protective steel plate based on LS-DYNA numerical simulation, combined with the rockfall data and maximum penetration depth of the bridge column, so that the corresponding steel plate protection can be adopted for the bridge column according to the minimum thickness of the bridge column protective steel plate, which has high reliability and rapidity.

[0078] Specifically, in this embodiment, according to the penetration depth P of the bridge column with a protective steel plate sz The impact energy of rockfall E cs , Steel plate protection thickness S t The corresponding model between the three should make the minimum protective steel plate thickness S tmin When the corresponding bridge column with protective steel plate is penetrated to depth P sz Less than the maximum permissible penetration depth of the bridge column [P cz ], the minimum protective steel plate thickness S can be obtained tmin ; After obtaining the minimum protective steel plate thickness S tmin After that, you can refer to the minimum protective steel plate thickness S tmin Protective steel plates are selected to provide additional protection for bridge columns, thereby ensuring the protective effectiveness of bridge columns and avoiding falling rocks from impacting bridge columns and causing damage to bridge columns and other structural components.

[0079] Example 2

[0080] In order to explain the bridge column protection method based on LS-DYNA in Example 1, a specific description is given through examples in this embodiment.

[0081] For example, in this embodiment, the rockfall impact energy E cs , column penetration depth P cz LS-DYNA numerical simulation orthogonal test, and the impact energy E of rockfall cs , protective steel plate thickness S t And the penetration depth P of the bridge column with protective steel plate sz The process of LS-DYNA numerical simulation orthogonal test is as follows:

[0082] Select the bridge column structure. In this embodiment, a conventional plate-column simply supported bridge structure is selected. Figure 2The bridge structure includes a bridge pavement 1, a box girder 2, a bridge deck shim 3, a cap beam 4, and a column 5, wherein the column 5 is vertically arranged, the cap beam 4 is fixedly installed on the column 5, a bridge deck shim 3 is arranged on the upper side of the cap beam 4, the bridge box 2 is supported by the bridge deck shim 3, and a bridge pavement 1 is fixedly arranged on the upper part of the bridge box 2; when additional protection is provided for the bridge column, it also includes a protective steel plate 6, and during the simulation process, a falling rock 7 that hits the bridge column.

[0083] Based on the design parameters of the bridge structure, a geometric model of the rockfall impact bridge structure is created in the ANSYS interface. The rockfall and bridge deck pads use the MAT_JOHNSON_HOLMQUIST_CONCRETE model, the steel uses the MAT_PLASTIC_KINEMATIC kinematic reinforcement model, and the columns and cap beams use the MAT_JOHNSON_HOLMQUIST_CONCRETE model. The calculation model is referenced Figure 3 and Figure 4 .

[0084] In this example, the column diameter is 1.4 meters, the height is 12 meters, and the center distance between the two columns is 6.4 meters. The reinforcement diameter is 1.1 cm, the longitudinal reinforcement spacing is 20 cm, the stirrup spacing is 20 cm, and the reinforcement cover thickness is 45 mm.

[0085] In this example, the falling rock is simulated by a cube with a side length of 1 meter; the falling rock hits the center of the left column vertically, and the impact speeds are 12m / s, 16m / s, 20m / s, and 24m / s, respectively, and the corresponding impact energies are 151.2kJ, 268.8kJ, 420.0kJ, and 604.8kJ; the thickness of the column protection steel plate is 0mm, 5mm, 10mm, 15mm, and 20mm respectively.

[0086] In this example, the mass of the upper bridge panel is selected as 4250kN. Four pads are set between the panel and the column. The pad length × width × height = 1.1m × 0.6m × 0.15m. Therefore, the average pressure exerted by each pad is 1609.848kPa. The pads and beams, and the fallen rocks and columns are in surface contact. CONSTRAINED_LAGRANGE_IN_SOLID is used for coupling between the internal reinforcement of the column and the concrete.

[0087] During the numerical simulation, the calculation parameters are shown in Table 1.

[0088] Table 1 Calculation parameters

[0089]

[0090] Reference Figure 5 and Figure 6, shows the damage to bridge columns and reinforcement after falling rocks hit bridge columns at different impact speeds without protective steel plates or with protective steel plates of 10 mm thickness. It can be seen that the penetration depth of falling rocks is significantly reduced after adding steel plate protection, and the degree of damage to steel bars and concrete is greatly improved. Therefore, adding steel plate protection can be used to protect against falling rock impact.

[0091] Reference Figure 7 , shows the stress diagram of a 10 mm thick protective steel plate under different impact velocities. It can be seen that the protective steel plate has been subjected to large-scale impact energy after the rockfall impact, and the stress and deformation effects of the steel plate are obvious. Moreover, as the rockfall impact speed gradually increases, the stress and deformation amplitude of the steel plate increases significantly, and the steel plate protection structure has an obvious protective effect on the column.

[0092] Reference Figure 8 and Fig. 9 , shows the displacement change curve of rockfall impact without protective steel plate and with protective steel plate thickness of 10 mm. It can be seen that the rockfall impact is a two-stage process. The first stage is that the rockfall impacts the column and penetrates quickly to the peak value; the second stage is that the rockfall rebounds. It can be seen that the first stage of rockfall penetration is significantly weakened under the protection of bridge column + steel plate, which shows that the protective steel plate has a significant protective effect on the column. After conducting orthogonal numerical simulation tests on rockfall impact energy and protective steel plate thickness, the peak penetration depth test results are statistically calculated, see Table 2.

[0093] Table 2 Results of orthogonal test on penetration depth

[0094]

[0095] When the thickness of the steel plate is set to zero, the relationship between the impact energy and penetration depth in Table 2 is plotted in the origin software. Fig.10 , obtain the rockfall impact energy E cs and the penetration depth P of the rockfall hitting the column cz relationship.

[0096] For adding protective steel plates, a relationship curve is drawn for the corresponding relationship between the impact energy of rockfall, the thickness of protective steel plates, and the penetration depth of rockfall hitting the column in Table 2, see Fig.11 , obtain the rockfall impact energy E cs , protective steel plate thickness S t , the penetration depth P of the falling rock hitting the column cz Statistical formula:

[0097] P cz =-0.62427+0.12999*In(E cs +190.97661)

[0098] E cs=0.5m*(vcosθ) 2 / 1000

[0099] P sz =-0.06781+0.18494*exp(E cs / 1097.527)*exp(-S t / 19.167).

[0100] Furthermore, in order to verify the present invention, the applicant also conducted the following verification:

[0101] Reference Fig.12 , the impact energy of the rockfall E cs As variables, they are the rockfall impact energy E cs The values ​​are assigned as 151.2 kJ, 268.8 kJ, 420 kJ, and 604.8 kJ, and are substituted into the penetration depth P of the rockfall impacting the column. cz The impact energy of rockfall E cs The corresponding model between:

[0102] P cz =-0.62427+0.12999*In(E cs +190.97661), and the corresponding penetration depth calculation value is obtained. The numerical simulation results and the calculation results are used as the X and Y coordinate values ​​to draw a scatter plot. It can be seen that the penetration depth P of the rockfall impacting the column cz The impact energy of rockfall E cs The calculation results of the corresponding models have better reliability.

[0103] Reference Fig.13 , the impact energy of the rockfall E cs , protective steel plate thickness S t As variables, they are the rockfall impact energy E cs The values ​​are 151.2 kJ, 268.8 kJ, 420 kJ, and 604.8 kJ, respectively, and the thickness of the protective steel plate is assigned to 0, 5 mm, 10 mm, 15 mm, and 20 mm, respectively. The penetration depth P of the bridge column with the protective steel plate is sequentially introduced in an orthogonal manner. sz The impact energy of rockfall E cs , Steel plate protection thickness S t The corresponding model between the three:

[0104] P sz =-0.06781+0.18494*exp(E cs / 1097.527)*exp(-S t / 19.167), and the calculation results are obtained. The numerical simulation results and the calculation results are used as the X and Y coordinate values ​​to draw a scatter plot. It can be seen that the penetration depth P of the bridge column with protective steel plate sz The impact energy of rockfall E cs , Steel plate protection thickness S t The calculation results of the corresponding model among the three are more reliable.

[0105] Example 3

[0106] The present invention also provides a bridge column protection system based on LS-DYNA, including a data acquisition unit, a calculation and judgment unit, and an output unit; the data unit is used to obtain rockfall data and the maximum permissible penetration depth of the bridge column [P cz ]; the calculation and judgment unit is used to calculate the penetration depth P of the rockfall impact column according to the rockfall data cz The impact energy of rockfall E cs The corresponding model between them is used to calculate the maximum penetration depth P of the falling rock hitting the column. czmax ; According to the penetration depth of rockfall hitting the column and the maximum permissible penetration depth of the bridge column [P cz ], determine whether it is necessary to add protection to the bridge column; if it is necessary to add protection to the bridge column, then according to the maximum allowable penetration depth of the bridge column [P cz ], rockfall data and the penetration depth P of bridge columns with protective steel plates sz The impact energy of rockfall E cs , protective steel plate thickness S t The corresponding model between the three is used to calculate the minimum thickness of the protective steel plate; the output unit is used to output the minimum thickness of the protective steel plate.

[0107] It should be noted that the LS-DYNA-based bridge column protection system in this embodiment corresponds to the LS-DYNA-based bridge column protection method in Example 1 and Example 2, and its implementation method and beneficial effects are also similar, which will not be repeated here.

[0108] Example 4

[0109] The present invention also provides a storage medium, in which instructions are stored, and the instructions are generated according to the bridge column protection method based on LS-DYNA in the above embodiment 1.

[0110] Specifically, the storage medium described in the present invention may include random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, register, hard disk, removable disk or CD-ROM. It should be noted that those skilled in the art may select the form and type of storage medium according to actual production and use requirements, and this is not further limited in this embodiment.

[0111] It should be noted that those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

Claims

1. A bridge column protection method based on LS-DYNA, characterized in that: include: S1: Data collection, obtaining rockfall data and the maximum permissible penetration depth of bridge columns [P cz ]; S2: Based on the rockfall data, combined with the penetration depth P of the rockfall hitting the column cz The impact energy of rockfall E cs The corresponding model between them is used to calculate the maximum penetration depth P of the falling rock hitting the column. czmax ; Wherein, the penetration depth P of the falling rock hitting the column cz The impact energy of rockfall E cs The corresponding models between them are obtained based on LS-DYNA numerical simulation; S3: Based on the penetration depth of the rockfall hitting the column and the maximum permissible penetration depth of the bridge column [P cz ], to determine whether additional protection is needed for bridge columns; S4: If additional protection is required for bridge columns, the maximum permissible penetration depth of the bridge columns [P cz ], rockfall data and the penetration depth P of bridge columns with protective steel plates sz The impact energy of rockfall E cs , protective steel plate thickness S t The corresponding model between the three is used to calculate the minimum thickness of the protective steel plate; wherein, the penetration depth P of the bridge column with the protective steel plate is sz The impact energy of rockfall E cs , protective steel plate thickness S t The corresponding models among the three are obtained based on LS-DYNA numerical simulation; S5: Protect bridge columns from rockfall impact disasters based on the minimum thickness of the protective steel plate.

2. The bridge column protection method based on LS-DYNA according to claim 1 is characterized in that: The rockfall data in step S1 include: the mass m of the rockfall, the impact velocity v of the rockfall, and the angle θ between the impact velocity of the rockfall and the horizontal direction.

3. The bridge column protection method based on LS-DYNA according to claim 2 is characterized in that: The step S2 specifically includes: S2.1: Select the bridge column structure and carry out the rockfall impact energy E cs and column penetration depth P cz The penetration depth P of the rockfall impacting the column is obtained by using the LS-DYNA numerical simulation orthogonal test. cz The impact energy of rockfall E cs The corresponding model between S2.2: Based on the penetration depth P of the rockfall impacting the column cz The impact energy of rockfall E cs The corresponding model and rockfall data are used to obtain the maximum energy E of the rockfall hitting the column. csmax and the maximum penetration depth P of the rockfall impacting the column czmax .

4. The bridge column protection method based on LS-DYNA according to claim 3 is characterized in that: In step S2, Rockfall impact energy E cs =0.5m*(vcosθ) 2 / 1000, where v is the impact velocity of the rockfall, θ is the angle between the impact velocity of the rockfall and the horizontal direction, and m is the mass of the rockfall; The penetration depth P of the rockfall hitting the column cz The impact energy of rockfall E cs The corresponding model between them is: P cz =-0.62427+0.12999*In(E cs +190.97661), Among them, E cs The impact energy of falling rocks.

5. The bridge column protection method based on LS-DYNA according to claim 4 is characterized in that: In step S3, if the maximum penetration depth P of the falling rock hitting the column czmax Greater than the maximum permissible penetration depth of the bridge column [P cz ], the judgment result is that it is necessary to add protection to the bridge columns; If the maximum penetration depth of the rockfall into the column is P cz Less than or equal to the maximum permissible penetration depth of the bridge column [P cz ], the judgment result is that there is no need to add protection for the bridge columns.

6. The bridge column protection method based on LS-DYNA according to claim 4 is characterized in that: The step S4 includes: S4.1: According to the bridge column structure, carry out the impact energy E of rockfall cs , protective steel plate thickness S t And the penetration depth P of the bridge column with protective steel plate sz The penetration depth P of the bridge column with protective steel plate is obtained by LS-DYNA numerical simulation orthogonal test. sz The impact energy of rockfall E cs , protective steel plate thickness S t The correspondence model between the three; S4.2: If the judgment result is that additional protection is needed for the bridge column, according to the penetration depth P of the bridge column with protective steel plate, sz The impact energy of rockfall E cs , protective steel plate thickness S t The corresponding model between the three, and the maximum penetration depth P of the falling rock hitting the column czmax , the maximum energy of the rockfall hitting the column E csmax and the maximum permissible penetration depth of bridge columns [P cz ], calculate the minimum steel plate protection thickness S tmin .

7. The bridge column protection method based on LS-DYNA according to claim 6 is characterized in that: In step S4, the penetration depth P of the bridge column with the protective steel plate is sz The impact energy of rockfall E cs , Steel plate protection thickness S t The corresponding model between the three is obtained through statistical fitting of Origin mathematical software, where P sz =-0.06781+0.18494*exp(E cs / 1097.527)*exp(-S t / 19.167), P sz is the penetration depth of the bridge column with protective steel plate, E cs is the rockfall impact energy, S t The thickness of the protective steel plate.

8. The bridge column protection method based on LS-DYNA according to claim 6 is characterized in that: In step S4.2, the minimum steel plate protection thickness S tmin Correspondingly, the penetration depth P of the bridge column with protective steel plate sz Less than the maximum permissible penetration depth of the bridge column [P cz ].

9. A bridge column protection system based on LS-DYNA, characterized in that: It includes a data acquisition unit, a calculation and judgment unit, and an output unit; The data unit is used to obtain rockfall data and the maximum permissible penetration depth of bridge columns [P cz ]; The calculation and judgment unit is used to calculate the penetration depth P of the rockfall impact column according to the rockfall data. cz The impact energy of rockfall E cs The corresponding model between them is used to calculate the maximum penetration depth P of the falling rock hitting the column. czmax ; According to the penetration depth of rockfall hitting the column and the maximum permissible penetration depth of the bridge column [P cz ], determine whether it is necessary to add protection to the bridge column; if it is necessary to add protection to the bridge column, then according to the maximum allowable penetration depth of the bridge column [P cz ], rockfall data and the penetration depth P of bridge columns with protective steel plates sz The impact energy of rockfall E cs , protective steel plate thickness S t The corresponding model between the three is used to calculate the minimum thickness of the protective steel plate; The output unit is used to output the minimum thickness of the protective steel plate.

10. A storage medium, characterized in that: The storage medium stores instructions, which are generated according to the LS-DYNA-based bridge column protection method described in any one of claims 1 to 8.

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