Test method for judging whether damaged T-beam bridge target can meet passing of armored vehicle

Abstract

The invention discloses a test method for judging whether a damaged T-beam bridge target can meet the passing requirement of an armored vehicle, and belongs to the field of test and evaluation. According to the method, factors such as brake, wheel track and wheel base of the armored vehicle are considered, an equivalent loading block is used for simulating the armored vehicle, and a loading test is carried out at the most unfavorable position of a T-beam bridge target through graded load loading. If the bridge collapses in the loading process, taking a lower level of load to represent the target traffic capacity of the damaged T-beam bridge; and if the bridge is not collapsed, loading a larger level of load until the load is loaded to the maximum tonnage of the simulated armored vehicle, and finally judging whether the T-beam bridge target can meet the passing of the armored vehicle or not. According to the test method, the equivalent loading block is used for replacing the armored vehicle, a graded load loading mode is used, the traffic capacity of the damaged T-beam bridge target is obtained, the test cost is saved, safety risks are avoided, and accurate judgment can be provided for whether the military armored vehicle passes through the damaged T-beam bridge target or not.

Description

Technical Field

[0001] This invention belongs to the field of testing and evaluation technology, and relates to a method for determining whether a damaged T-beam bridge target can meet the requirements of armored vehicle passage tests. Background Technology

[0002] Large bridges, as crucial nodes in transportation infrastructure, hold exceptionally important strategic positions. During military conflicts or terrorist attacks, bridges are frequently targeted. Whether a bridge target damaged by an explosion can accommodate armored vehicles is critical to the transport of weapons, ammunition, personnel, and supplies. The paper "Safety Inspection and Load-Bearing Capacity Assessment of Forest Highway Bridges" uses two loading vehicles with a total load capacity of approximately 430 kN to load the bridge at designated locations; the paper "Research on the Detection and Assessment Method of Load-Bearing Capacity of In-Service Prestressed Concrete Bridges" uses six trucks with a total weight of approximately 370 kN. Neither of these papers considers the most unfavorable location of the damaged bridge target, and the use of actual vehicles for loading results in high testing costs and safety risks. Furthermore, neither paper provides a basis for determining whether a bridge target damaged by an explosion can accommodate temporary passage for loaded vehicles. Summary of the Invention

[0003] This invention provides a method for determining whether a damaged T-beam bridge target can pass through an armored vehicle. By replacing the armored vehicle with an equivalent loading block and using a graded load loading method, the passability of the damaged T-beam bridge target is obtained, which saves test costs and avoids safety risks. It can provide an accurate judgment for whether military armored vehicles can pass through the damaged T-beam bridge target.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A method for determining whether a damaged T-beam bridge target meets the requirements for armored vehicle passage testing includes the following steps:

[0006] Step 1: Consider the braking, track width, and wheelbase of the armored vehicle, and use multi-stage loading blocks to perform an equivalent simulation of the armored vehicle. Obtain the number of stages N of the multi-stage loading blocks based on the size and density of the loading blocks.

[0007] Step 2: Apply actual graded loads to the i-th level loading block at the most unfavorable position of the damaged T-beam bridge target;

[0008] Step 3: Based on the load loading test results of Step 2, determine whether the damaged T-beam bridge target can accommodate armored vehicles.

[0009] If the bridge target collapses after the i-th level equivalent loading block is loaded, it is determined that the damaged T-beam bridge target cannot meet the passage of armored vehicles, and the lower level load is taken to represent the passage capacity of the damaged T-beam bridge target, i.e., N = i-1.

[0010] If the bridge target does not collapse after the Nth level equivalent loading block is loaded, then the damaged T-beam bridge target is deemed to meet the requirements for armored vehicle passage.

[0011] Optionally, step one specifically includes:

[0012] Step 1: Based on the actual tonnage T1 of the armored vehicle (in tons), and considering the braking effect, determine the maximum tonnage T2 of the equivalent loading block (in tons).

[0013] T2 = f × T1;

[0014] In the formula, f is the braking coefficient, in units of 1;

[0015] Step 2: Based on the wheelbase and track width of the armored vehicle, design the quantity, size, and mass of the equivalent loading blocks for the first-level load:

[0016] The equivalent number of primary load blocks is 2, simulating the two sets of track wheels of an armored vehicle; the length of the load block, l1, is in meters, considering the wheelbase of the armored vehicle, and is the track length; the width, k1, is in meters, and is the track width; the height, h1, is in meters, and is half the track height; the mass of the primary load block, M1, is in tons.

[0017] M1 = 2 × ρ × (l1·k1·h1);

[0018] In the formula, ρ is the density of the equivalent loading block, in t / m³. 3 ;

[0019] Step ③: Determine the mass and dimensions of the equivalent loading blocks for other load levels:

[0020] The equivalent loading blocks for other load levels have the same mass and size. The mass of the equivalent loading block for the i-th level is M. i :

[0021]

[0022] In the formula, N is the total number of stages of the graded load.

[0023] Optionally, the length l of the i-th level equivalent loading block i The unit is m, which represents the length l1 of the first-level equivalent loading block, and the width k is... i The unit is m, which is:

[0024] k i =d+k1;

[0025] In the formula, d is the wheelbase of the armored vehicle, in meters; h is the height of the i-th level equivalent loading block. i The unit is m, which is:

[0026]

[0027] Optionally, step two specifically includes:

[0028] Step 1: Place two equivalent loading blocks of the first-level load on the bridge deck at the most unfavorable position of the T-beam bridge target. The distance d between the two equivalent loading blocks, in meters, is the wheel track of the armored vehicle.

[0029] Step 2: Wait for more than 5 minutes. If the damaged T-beam bridge target has not collapsed, then place the secondary load M2 horizontally on the primary load.

[0030] Step 3: Repeat step 2, and apply the next load M. i Horizontally placed under the upper load M i-1 Up, until the bridge collapses or the Nth level load is completed.

[0031] The beneficial effects of this invention are:

[0032] This method considers factors such as the braking performance, wheelbase, and track width of armored vehicles. It uses equivalent loading blocks to simulate armored vehicles and applies graded loads to the bridge deck near the damaged T-beam bridge target. The final determination is whether the most unfavorable position of the T-beam bridge target is suitable for armored vehicle passage. This experimental method saves on testing costs and avoids safety risks, providing an accurate assessment of whether military armored vehicles should pass over damaged T-beam bridge targets. Attached Figure Description

[0033] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0034] Figure 1 This is a schematic diagram of the load test for the traffic capacity of the damaged T-beam bridge target according to the present invention;

[0035] Figure 2 This is a schematic diagram of the equivalent loading block structure of an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the equivalent loading block structure of the i-th level in an embodiment of the present invention;

[0037] Figure 4 This is a physical image of the load-bearing test of the damaged T-beam bridge target according to an embodiment of the present invention. Detailed Implementation

[0038] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0039] This invention proposes a method for determining whether a damaged T-beam bridge target can be used for armored vehicle passage tests, specifically for reinforced concrete T-beam bridges damaged by explosions. This method replaces the armored vehicle with an equivalent loading block and uses a graded load application method to obtain the passage capability of the damaged T-beam bridge target. The final conclusion is whether the damaged T-beam bridge target can be used for armored vehicle passage, providing an accurate assessment of whether military armored vehicles should pass over the damaged T-beam bridge target in emergency situations.

[0040] To solve the above-mentioned technical problems, the present invention provides a method for determining whether a damaged T-beam bridge target can meet the requirements of an armored vehicle passage test. This test method includes the following steps:

[0041] Step 1: Considering the braking, wheelbase, and track width of the armored vehicle, perform an equivalent simulation of the armored vehicle using multi-stage loading blocks, and obtain the number of stages N of the simulated loading blocks based on the size and density of the loading blocks;

[0042] Step Two: At the most unfavorable location of the damaged T-beam bridge target (for T-beam bridges, this is generally the damaged section at the point of maximum bending moment, for example...) Figure 1 The damage location (the damaged section is the most unfavorable position of the damaged T-beam bridge target) is used to apply the actual graded load to the i-level loading block.

[0043] Step 3: Based on the load loading test results of Step 2, determine whether the damaged T-beam bridge target can accommodate armored vehicles.

[0044] If the bridge target collapses after the i-th level equivalent loading block is loaded, it is determined that the damaged T-beam bridge target cannot meet the passage of armored vehicles, and the lower level load is taken to represent the passage capacity of the damaged T-beam bridge target.

[0045] If the bridge target does not collapse after the Nth level equivalent loading block is loaded, then the damaged T-beam bridge target is deemed to meet the requirements for armored vehicle passage.

[0046] In this disclosure, step one specifically includes:

[0047] First, based on the actual tonnage T1 (in tons) of the armored vehicle, and considering the braking effect, determine the maximum tonnage T2 (in tons) of the equivalent loading block.

[0048] T2 = f × T1;

[0049] In the formula, f is the braking coefficient (unit 1);

[0050] Secondly, based on the wheelbase and track width of the armored vehicle, design the quantity, size, and mass of the equivalent loading blocks for the first-level load:

[0051] The equivalent number of primary load blocks is generally two, simulating the two sets of track wheels of an armored vehicle; the length l1 (in meters) of the load block considers the wheelbase of the armored vehicle and is the track length, the width k1 (in meters) is the track width, and the height h1 (in meters) is half the track height; the mass M1 (in tons) of the primary load block is...

[0052] M1 = 2 × ρ × (l1·k1·h1);

[0053] In the formula, ρ is the density of the equivalent loading block (unit: t / m³). 3 );

[0054] Step ③: Determine the mass and dimensions of the equivalent loading blocks for other load levels:

[0055] The equivalent loading blocks for other load levels have the same mass and size. The mass of the equivalent loading block for the i-th level is M. i :

[0056]

[0057] In the formula, N is the total number of stages of the graded load.

[0058] In this disclosure, the length l of the i-th level equivalent loading block i (Unit: m) represents the length l1 (unit: m) and width k of the first-level equivalent loading block. i (Unit: m) is:

[0059] k i =d+k1;

[0060] In the formula, d is the wheel track of the armored vehicle (in meters); h is the height of the i-th level equivalent loading block. i (Unit: m) is:

[0061]

[0062] In this disclosure, step two specifically includes:

[0063] Step 1: Place two equivalent loading blocks of the first-level load on the bridge deck at the most unfavorable position of the T-beam bridge target. The distance d (in meters) between the two equivalent loading blocks is the wheel track of the armored vehicle.

[0064] Step 2: Wait for more than 5 minutes. If the damaged T-beam bridge target has not collapsed, then place the secondary load M2 horizontally on the primary load.

[0065] Step 3: Repeat step 2, and apply the next load M. i Horizontally placed under the upper load M i-1 Up, until the bridge collapses or the Nth level load is completed.

[0066] Example 1:

[0067] Combination Figure 1-4 The method for determining whether a damaged T-beam bridge target meets the requirements for armored vehicle passage testing, as described in this invention, is implemented by following these steps:

[0068] Step 1: Considering factors such as braking, wheelbase, and track width of armored vehicles, use loading blocks to perform an equivalent simulation of the armored vehicle.

[0069] Step 1: Based on the actual tonnage of the armored vehicle (30t) and considering the braking effect, determine the maximum tonnage of the equivalent loading block to be 39t.

[0070] T2 = 1.3 × 30t = 39t

[0071] In the formula, f is the braking coefficient, which is taken as 1.3.

[0072] Step 2: Based on factors such as the wheelbase and track width of the armored vehicle, design the quantity, size, and mass of the equivalent loading blocks for the first-level load:

[0073] The equivalent number of primary load blocks is generally two, simulating the two sets of track wheels of an armored vehicle. The length l1 of the load block considers the wheelbase of the armored vehicle, which is the track length of 4m; the width k1 is the track width of 0.5m; and the height h1 is half the track height of 0.5m. The mass M1 of the primary load block is 4.65t.

[0074] M1=2×2.325×(4·0.5·0.5)=4.65t

[0075] In the formula, ρ is the density of the equivalent loading block, 2.325 t / m³. 3 .

[0076] Step ③: Determine the mass and dimensions of the equivalent loading blocks for other load levels:

[0077] The mass and dimensions of the equivalent loading blocks for other load levels are generally consistent. The mass M of the equivalent loading block for the i-th level is... i

[0078]

[0079] In the formula, N is the total number of stages of the graded load, which is taken as 10 here.

[0080] The length of the i-th level equivalent loading block is l i Generally, the length of the first-level equivalent loading block is l1 = 4m, and the width is k. i Generally,

[0081] k i =d + k1 = 2.5m + 0.5m = 3m

[0082] In the formula, d is the wheel track of the armored vehicle, which is 2.5m.

[0083] The height h of the i-th level equivalent loading block i for

[0084]

[0085] Step 2: Apply graded loads at the most unfavorable position (damaged section at the maximum bending moment) of the damaged T-beam bridge target.

[0086] Step 1: Place two equivalent loading blocks of level 1 load on the bridge deck at the location of the explosion damage to the target on the T-beam bridge. The distance d between the two equivalent loading blocks is 2.5m, which is the wheel track of the armored vehicle.

[0087] Step 2: Wait for more than 5 minutes. If the damaged T-beam bridge target has not collapsed, then place the secondary load M2 = 3.82t horizontally on the primary load.

[0088] Step 3: Repeat step 2, and apply the next load M. i Horizontally placed under the upper load M i-1 Up until the bridge collapses or the 10th level load is completed.

[0089] Step 3: Based on the test results, determine whether the damaged T-beam bridge target is suitable for armored vehicle passage.

[0090] After the 10th level equivalent loading block was applied, the bridge target did not collapse, and it was determined that the damaged T-beam bridge target was suitable for armored vehicle passage.

[0091] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for determining whether a damaged T-beam bridge target meets the requirements for armored vehicle passage testing, characterized in that, Includes the following steps: Step 1: Consider the braking, track width, and wheelbase of the armored vehicle, and use multi-stage loading blocks to perform an equivalent simulation of the armored vehicle. Obtain the number of stages N of the multi-stage loading blocks based on the size and density of the loading blocks. Step 2: Apply actual graded loads to the i-th level loading block at the most unfavorable position of the damaged T-beam bridge target; Step 3: Based on the load loading test results of Step 2, determine whether the damaged T-beam bridge target can accommodate armored vehicles. If the bridge target collapses after the i-th level equivalent loading block is loaded, it is determined that the damaged T-beam bridge target cannot meet the passage of armored vehicles, and the lower level load is taken to represent the passage capacity of the damaged T-beam bridge target, i.e., N = i-1. If the bridge target does not collapse after the Nth level equivalent loading block is loaded, then the damaged T-beam bridge target is deemed to meet the requirements for armored vehicle passage.

2. The method for determining whether a damaged T-beam bridge target meets the requirements of an armored vehicle passage test, as described in claim 1, is characterized in that... Step one specifically includes: Step 1: Based on the actual tonnage T1 of the armored vehicle (in tons), and considering the braking effect, determine the maximum tonnage T2 of the equivalent loading block (in tons). T2 = f × T1; In the formula, f is the braking coefficient, in units of 1; Step 2: Based on the wheelbase and track width of the armored vehicle, design the quantity, size, and mass of the equivalent loading blocks for the first-level load: The equivalent number of primary load blocks is 2, simulating the two sets of track wheels of an armored vehicle; the length of the load block, l1, is in meters, considering the wheelbase of the armored vehicle, and is the track length; the width, k1, is in meters, and is the track width; the height, h1, is in meters, and is half the track height; the mass of the primary load block, M1, is in tons. M1 = 2 × ρ × (l1·k1·h1); In the formula, ρ is the density of the equivalent loading block, in t / m³. 3 ; Step ③: Determine the mass and dimensions of the equivalent loading blocks for other load levels: The equivalent loading blocks for other load levels have the same mass and size. The mass of the equivalent loading block for the i-th level is M. i : In the formula, N is the total number of stages of the graded load.

3. The method for determining whether a damaged T-beam bridge target meets the requirements of an armored vehicle passage test, as described in claim 2, is characterized in that... The length of the i-th level equivalent loading block is l i The unit is m, which represents the length l1 of the first-level equivalent loading block, and the width k is... i The unit is m, which is: k i =d+k1; In the formula, d is the wheelbase of the armored vehicle, in meters; h is the height of the i-th level equivalent loading block. i The unit is m, which is:

4. The method for determining whether a damaged T-beam bridge target meets the requirements of an armored vehicle passage test, as described in claim 1, 2, or 3, is characterized in that... Step two specifically includes: Step 1: Place two equivalent loading blocks of the first-level load on the bridge deck at the most unfavorable position of the T-beam bridge target. The distance d between the two equivalent loading blocks, in meters, is the wheel track of the armored vehicle. Step 2: Wait for more than 5 minutes. If the damaged T-beam bridge target has not collapsed, then place the secondary load M2 horizontally on the primary load. Step 3: Repeat step 2, and apply the next load M. i Horizontally placed under the upper load M i-1 Up, until the bridge collapses or the Nth level load is completed.

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