Construction simulation analysis method for composite floor on wheel type construction machine

Abstract

The invention discloses a construction simulation analysis method for a composite floor slab on a wheel type construction machine, which comprises the following steps: step S1, floor load is pre-applied to a steel beam of the composite floor slab, and the floor load is used for replacing the application of a concrete slab unit, so that the steel beam generates first-stage deformation delta 1 under the action of the floor load; s2, the floor load applied in the step S1 is passivated, then a concrete slab unit is added to the steel beam, deformation of the concrete slab unit is kept consistent with the first-stage deformation delta 1, and cooperative deformation of concrete and the steel beam is achieved; and S3, on the basis of the cooperative deformation formed in the step S2, adding vehicle loads of the wheeled construction machinery, and separating the vehicle loads according to construction stages to complete construction simulation analysis. By simulating the load and deformation state of the whole construction process, the accuracy of the checking result is improved, and the construction safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and more specifically, to a construction simulation analysis method for composite floor slabs on wheeled construction machinery. Background Technology

[0002] Using wheeled construction machinery on floor slabs is a common construction method in steel structure engineering. The movement of cranes on the floor slab and their fixed-position lifting operations involve calculations of the floor slab's load-bearing capacity, cracks, and deflection. Currently, the traditional approach to calculating the load-bearing capacity of wheeled construction machinery on floor slabs is through numerical simulation analysis using finite element method (FEM) software. This involves creating a structural model using FEM software such as Midas, discretizing the infinite-degree-of-freedom problem into a finite number of small regions, and then treating each small region as a finite-degree-of-freedom problem. A certain static load is applied to the tire area of ​​a specific slab for individual calculation, thus obtaining an approximate solution for the entire structure.

[0003] During the project construction phase, the calculation of floor slabs for construction machinery (wheeled) is mainly divided into two categories based on the type of floor slab: calculation of cast-in-place concrete floor slabs and calculation of composite floor slabs. For cast-in-place concrete slabs, due to the single material and the absence of multiple materials working together, existing calculation and analysis software algorithms are quite practical, and the analysis results generally match the actual situation in practical projects. For composite floor slabs, the general calculation methods are similar to those for cast-in-place concrete floor slabs. However, practical experience has shown that composite floor slabs frequently experience end bending failure and support shear failure, and the internal forces at the failure points are greater than those for cast-in-place concrete floor slabs. Existing calculation methods for composite floor slabs deviate significantly from the actual stress state, failing to accurately reflect the true working performance of the floor slab under the action of construction machinery, thus posing potential construction safety hazards. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of this invention is to provide a construction simulation analysis method for composite floor slabs on wheeled construction machinery. By simulating the load and deformation state of the entire construction process, the accuracy of the calculation results is improved and construction safety is ensured.

[0005] The present invention adopts the following technical solution:

[0006] A construction simulation analysis method for composite floor slabs on wheeled construction machinery includes the following steps:

[0007] Step S1: Simulate the floor slab curing process

[0008] A floor load is pre-applied to the steel beams of the composite floor slab. The floor load is used to replace the application of concrete slab units, so that the steel beams undergo a stage deformation Δ1 under the action of the floor load.

[0009] Step S2: Simulate the concrete curing and forming process

[0010] The floor load applied in step S1 is passivated, and then concrete slab units are added to the steel beam, and the deformation of the concrete slab units is kept consistent with the first-stage deformation Δ1, so as to achieve coordinated deformation of concrete and steel beam.

[0011] Step S3: Simulate the process of wheeled construction machinery moving onto the floor slab.

[0012] Based on the collaborative deformation formed in step S2, the vehicle load of wheeled construction machinery is added, and the vehicle load is separated according to the construction stage to complete the construction simulation analysis.

[0013] Furthermore, the floor load is the self-weight load of the composite floor slab, which is calculated and determined based on the design thickness and material density of the concrete slab.

[0014] Furthermore, the specific method for "passivating the floor load applied in step S1" in step S2 is as follows: by using the load passivation function of the finite element analysis software, the floor load applied to the steel beam in step S1 is removed without changing the first-stage deformation Δ1 that has already occurred in the steel beam.

[0015] Furthermore, the specific method for "separating the vehicle load according to the construction stage" in step S3 is as follows: the vehicle load is discretized into the moving load during the construction machinery walking stage and the static load during the fixed-station hoisting stage, and simulation calculations are performed separately.

[0016] Furthermore, the composite floor slab is a profiled steel sheet-concrete composite floor slab or a steel truss concrete composite floor slab.

[0017] Furthermore, the specific steps for "achieving coordinated deformation of concrete and steel beam" in step S2 are as follows: when adding concrete slab units, the stiffness of the concrete slab units is superimposed based on the first-stage deformation Δ1 of the steel beam, so that the concrete slab and steel beam form an integral force system, simulating the coordinated working state of the two.

[0018] Beneficial effects

[0019] This invention effectively reduces additional stress within the slab by applying the slab's self-weight load and simulating the curing process without considering the slab's stiffness. After the concrete slab has cured, concrete slab units are added based on the deformation of the steel beams from the previous step, ensuring coordinated deformation between the concrete slab and the steel beams, while effectively simulating the overall stiffness of the concrete slab and the surrounding steel beams under this condition. The final step adds wheeled construction machinery loads to the cumulative deformation from the first two steps, resulting in a more accurate match to actual site conditions and calculation results that are closer to real-world values. Attached Figure Description

[0020] Figure 1 A schematic diagram of beam and column installation;

[0021] Figure 2 A schematic diagram of floor slab pouring;

[0022] Figure 3 A schematic diagram showing the completion of floor slab curing;

[0023] Figure 4 This is a diagram illustrating the operation of a truck crane.

[0024] Figure 5 Flowchart of the construction simulation analysis method of this invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] As shown in the figure, this invention discloses a construction simulation analysis method for composite floor slabs on wheeled construction machinery, comprising the following steps:

[0027] Step S1: Simulate the floor slab curing process

[0028] A floor load is pre-applied to the steel beams of the composite floor slab. The floor load is used to replace the application of concrete slab units, so that the steel beams undergo a stage deformation Δ1 under the action of the floor load.

[0029] Step S2: Simulate the concrete curing and forming process

[0030] The floor load applied in step S1 is passivated, and then concrete slab units are added to the steel beam, and the deformation of the concrete slab units is kept consistent with the first-stage deformation Δ1, so as to achieve coordinated deformation of concrete and steel beam.

[0031] Step S3: Simulate the process of wheeled construction machinery moving onto the floor slab.

[0032] Based on the collaborative deformation formed in step S2, the vehicle load of wheeled construction machinery is added, and the vehicle load is separated according to the construction stage to complete the construction simulation analysis.

[0033] This invention takes into account the impact of the concrete floor slab pouring and curing process on the steel structure. Floor loads are pre-applied to the steel beams, and the floor slabs are passivated after curing. The actual situation is simulated through a cumulative model.

[0034] This invention reduces the calculation deviation of additional stress within the slab by applying floor loads to replace concrete slab units to simulate the curing stage, avoiding additional stress within the slab caused by prematurely incorporating the stiffness of the unformed concrete slab, and is consistent with the actual state of concrete without stiffness contribution during the curing stage.

[0035] In one embodiment of the present invention, the floor load is the self-weight load of the composite floor slab, which is calculated and determined based on the design thickness and material density of the concrete slab.

[0036] During the curing stage of the concrete slab, its strength and stiffness have not yet been formed, and it cannot participate in load-bearing. In this step, instead of adding concrete slab elements to the finite element model, a "floor load" (i.e., the self-weight load of the concrete slab, calculated based on the design thickness and density of the concrete) is pre-applied directly to the steel beam, causing the steel beam to undergo a stage deformation Δ1 under this load. This process can realistically simulate the actual state during the curing stage where the steel beam only bears the self-weight of the floor slab and the concrete slab contributes no stiffness, avoiding the calculation deviation of additional stress within the slab caused by prematurely incorporating the stiffness of the concrete slab.

[0037] In one embodiment of the present invention, the specific method of "passivating the floor load applied in step S1" in step S2 is as follows: by using the load passivation function of the finite element analysis software, the floor load applied to the steel beam in step S1 is removed without changing the first-stage deformation Δ1 that has been generated in the steel beam.

[0038] After the concrete has cured and its strength and stiffness meet the design requirements, it needs to work in conjunction with the steel beams. First, the floor load applied in step S1 is removed using the load passivation function of the finite element software (but the first-stage deformation Δ1 of the steel beam is retained). Then, concrete slab elements are added to the steel beams, and the initial deformation of the concrete slab elements is made consistent with the first-stage deformation Δ1 of the steel beams. Through this operation, the concrete slab and the steel beams form an integrated load-bearing system, accurately simulating their coordinated deformation state and reflecting the overall stiffness of the concrete slab and the surrounding steel beams.

[0039] In one embodiment of the present invention, the specific method of "separating the vehicle load according to the construction stage" in step S3 is as follows: the vehicle load is discretized into the moving load of the construction machinery walking stage and the static load of the fixed station hoisting stage, and simulation calculations are performed separately to finally obtain the bearing capacity, crack and deflection data of the composite floor slab under the action of the construction machinery, thus completing the construction simulation analysis.

[0040] In one embodiment of the present invention, the composite floor slab is a profiled steel sheet-concrete composite floor deck or a steel truss-concrete composite floor deck. The present invention accurately simulates coordinated deformation. After curing, concrete slab units are added to the deformation of the steel beams, ensuring consistent and coordinated deformation between the two. This truly reflects the stiffness characteristics of the overall load-bearing system of the "steel beam-concrete slab," solving the problem of neglecting coordinated deformation in existing methods.

[0041] In one embodiment of the present invention, the specific steps of "achieving coordinated deformation of concrete and steel beam" in step S2 are as follows: when adding concrete slab units, the stiffness of the concrete slab units is superimposed based on the first-stage deformation Δ1 of the steel beam, so that the concrete slab and the steel beam form an integral force system, simulating the coordinated working state of the two.

[0042] The calculation results of this invention are closer to reality. It simulates the entire process of curing, forming and mechanical operation in stages, and separates vehicle loads according to construction stages. It is completely matched with the actual process of on-site construction. The calculation results can accurately reflect the real stress state of the composite floor slab, providing a more reliable basis for construction safety.

[0043] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A construction simulation analysis method for composite floor slabs on wheeled construction machinery, characterized in that: Includes the following steps: Step S1: Simulate the floor slab curing process A floor load is pre-applied to the steel beams of the composite floor slab. The floor load is used to replace the application of concrete slab units, so that the steel beams undergo a stage deformation Δ1 under the action of the floor load. Step S2: Simulate the concrete curing and forming process The floor load applied in step S1 is passivated, and then concrete slab units are added to the steel beam, and the deformation of the concrete slab units is kept consistent with the first-stage deformation Δ1, so as to achieve coordinated deformation of concrete and steel beam. Step S3: Simulate the process of wheeled construction machinery moving onto the floor slab. Based on the collaborative deformation formed in step S2, the vehicle load of wheeled construction machinery is added, and the vehicle load is separated according to the construction stage to complete the construction simulation analysis.

2. The construction simulation analysis method for combined floor slabs on wheeled construction machinery according to claim 1, characterized in that: The floor load is the self-weight load of the composite floor slab, which is calculated based on the design thickness and material density of the concrete slab.

3. The construction simulation analysis method for composite floor slabs on wheeled construction machinery according to claim 1, characterized in that: The specific method for "passivating the floor load applied in step S1" in step S2 is as follows: by using the load passivation function of the finite element analysis software, the floor load applied to the steel beam in step S1 is removed without changing the first-stage deformation Δ1 that has already occurred in the steel beam.

4. The construction simulation analysis method for combined floor slabs on wheeled construction machinery according to claim 1, characterized in that: The specific method for "separating the vehicle load according to the construction stage" in step S3 is as follows: the vehicle load is discretized into the moving load of the construction machinery walking stage and the static load of the fixed station hoisting stage, and simulation calculations are performed separately.

5. The construction simulation analysis method for combined floor slabs on wheeled construction machinery according to claim 1, characterized in that: The composite floor slab is either a profiled steel sheet-concrete composite floor slab or a steel truss-concrete composite floor slab.

6. The construction simulation analysis method for composite floor slabs on wheeled construction machinery according to claim 1, characterized in that: The specific steps for "achieving coordinated deformation of concrete and steel beam" in step S2 are as follows: when adding concrete slab elements, the stiffness of the concrete slab elements is superimposed based on the first-stage deformation Δ1 of the steel beam, so that the concrete slab and steel beam form an integral force system, simulating the coordinated working state of the two.

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