A simplified analysis method for complex temporary independent support systems

Abstract

The application relates to a simplified analysis method for a complex independent temporary support system, which comprises the following steps: 1, dividing the demarcation point of the temporary structure and the whole structure; 2, establishing a finite element model of the whole structure; 3, establishing a fine nonlinear finite element model of the complex independent temporary support system; 4, performing nonlinear static analysis on the fine nonlinear finite element model of the complex independent temporary support system to obtain a load displacement curve of the temporary structure; 5, establishing a simplified finite element model of the complex independent temporary support system; 6, performing nonlinear static analysis on the simplified finite element model of the complex independent temporary support system to obtain a simplified load displacement curve of the temporary structure; 7, adjusting the material nonlinearity and the geometric nonlinearity model parameters so that the simplified load displacement curve of the temporary structure approximates to the load displacement curve of the temporary structure; and 8, adding the simplified load displacement curve of the temporary structure meeting the approximation requirement to the finite element model of the whole structure to perform whole structure analysis and calculation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of construction site safety management and control, and particularly relates to a simplified analysis method for a complex independent temporary support system. BACKGROUND

[0002] As an important structure in the construction process, the stiffness of the temporary structure has an important influence on the formation of the overall structure. In the analysis of the mechanical properties of the structure, for a simple temporary structure, a full model of the temporary structure can be established, and the influence of the temporary structure can be truly simulated in the simulation. However, for a complex temporary structure, if a full model is established, on the one hand, the overall finite element model for simulating the construction process is too large, which affects the analysis efficiency; on the other hand, the modification of the full model of the complex temporary structure leads to the adjustment of the overall simulation. The temporary structure is usually simplified as a group of vertical springs and the overall structure for calculation. However, the temporary structure is simplified as a group of springs that are not connected to each other, without considering the force connection of the temporary structure itself, i.e., without considering the coupling effect between the springs. For a complex independent temporary support system, if it is simplified as a single linear spring according to the conventional method, the nonlinear load-displacement characteristics of the temporary support system cannot be reflected. The geometric deviation of the temporary structure, the offset of the support point, etc. will reduce its stability and further affect its bearing capacity.

[0003] Therefore, it is of great significance to establish a simplified simulation method for a complex independent temporary support system for overall structural analysis.

[0004] The information disclosed in this BACKGROUND section is only intended to increase an understanding of the general background of the application and is not intended to be a recognition or a suggestion that this information forms part of the prior art that is already known to those of ordinary skill in the art. SUMMARY

[0005] The present application provides a simplified analysis method for a complex independent temporary support system, which comprises the following steps:

[0006] To solve the above technical problems, the present application comprises the following technical solutions:

[0007] A simplified analysis method for a complex independent temporary support system, comprising the following steps:

[0008] Step S1, dividing the demarcation point of the temporary structure and the overall structure, denoted as Q point; the temporary structure and the overall structure are connected through the Q point for transmitting displacement and force boundary;

[0009] Step S2: Establish the overall structural finite element model;

[0010] Step S3: Based on beam elements, shell elements, or solid elements, establish a refined nonlinear finite element model of the complex independent temporary support system. The nonlinearity includes material nonlinearity and geometric nonlinearity.

[0011] Step S4: Perform nonlinear static analysis on the complex independent temporary support system detailed nonlinear finite element model in step S3 using the arc length method or Ritz method to obtain the load-displacement curve of the temporary structure.

[0012] Step S5: Based on beam elements, shell elements or solid elements, establish a simplified finite element model of a complex independent temporary support system. The nonlinearity includes material nonlinearity and geometric nonlinearity, or nonlinear spring elements can be used to equivalently form a simplified finite element model of a complex independent temporary support system.

[0013] Step S6: Simplify the finite element model of the complex independent temporary support system in step S5, and perform nonlinear static analysis using the arc length method or Ritz method to obtain the load-displacement curve of the simplified temporary structure.

[0014] Step S7: Adjust the material nonlinearity and geometric nonlinearity or nonlinear spring element parameters of the simplified finite element model of the complex independent temporary support system so that the load-displacement curve of the simplified temporary structure approximates the load-displacement curve of the temporary structure.

[0015] Step S8: Add the simplified temporary structure load-displacement curve that meets the approximation requirements to the overall structural finite element model, perform overall structural analysis, form the overall structural finite element equation, and solve it using numerical calculation methods.

[0016] Furthermore, in step S4, the load-displacement curve of the temporary structure is as follows:

[0017] 1 F = 1 f( Q U) (1)

[0018] in, Q U is the generalized displacement at point Q of the temporary structure's load-displacement curve; 1 f(*) is a generalized nonlinear function.

[0019] Furthermore, in step S6, the simplified temporary structure load-displacement curve is as follows:

[0020] 2 F = 2 f( Q U) (2)

[0021] in, QU represents the generalized displacement at point Q in the simplified load-displacement curve of the temporary structure. 2 f(*) is a generalized nonlinear function.

[0022] Further, step S7 includes: 2 f(*) approaches 1 f(*), until we get:

[0023]

[0024] Where ξ is the convergent minimum value.

[0025] Furthermore, the generalized displacement at point Q of the temporary structure load-displacement curve or the generalized displacement at point Q of the simplified temporary structure load-displacement curve is a translational displacement or a rotational displacement.

[0026] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0027] This invention provides a simplified analysis method for complex independent temporary support systems. It replaces the complex independent temporary support system with a simplified nonlinear finite element model of the rod system or a single nonlinear spring element model to analyze the overall structure, improving analysis efficiency. The approximate nonlinear finite element model of the rod system or the single nonlinear spring element model can realistically reproduce the mechanical properties of the complex independent temporary support system, especially the weakening of its load-bearing capacity due to overall stability, thus improving the safety of structural verification calculations. Furthermore, replacing the complex independent temporary support system with a simplified nonlinear finite element model of the rod system or a single nonlinear spring element model facilitates the simulation of the overall model's construction process (such as unloading), for example, by using temperature adjustment methods to achieve the required unloading amount and analyzing the stiffness perturbation of temporary supports. This simplified analysis method for complex independent temporary support systems is easy to operate, has low cost, and has good potential for widespread application. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the temporary structure load-displacement curve and the simplified temporary structure load-displacement curve in a simplified analysis method for complex independent temporary support systems according to an embodiment of the present invention.

[0029] Figure 2 A flowchart of a simplified analysis method for complex independent temporary support systems in one embodiment of the present invention. Detailed Implementation

[0030] The simplified analysis method for complex independent temporary support systems provided by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention. For ease of description, the terms "upper" and "lower" used below are consistent with the upper and lower directions in the accompanying drawings, but this should not be construed as a limitation of the technical solution of the present invention.

[0031] Example 1

[0032] The following is combined with Figure 1 and 2 This invention provides a detailed explanation of the simplified analysis method for complex, independent, temporary support systems.

[0033] Please refer to Figure 1 and 2 A simplified analysis method for complex independent temporary support systems includes the following steps:

[0034] Step S1: Delineate the boundary between the temporary structure and the overall structure, denoted as point Q; the temporary structure and the overall structure transfer displacement and force boundaries through point Q.

[0035] Step S2: Establish the overall structural finite element model, denoted as Model0;

[0036] Step S3: Based on beam elements, shell elements or solid elements, establish a refined nonlinear finite element model of the complex independent temporary support system. The nonlinearity includes material nonlinearity and geometric nonlinearity, denoted as Model1.

[0037] Step S4: For the complex independent temporary support system in Model 1, perform nonlinear static analysis using the Arc-length Method or the Riks Method to obtain the load-displacement curves of the temporary structure.

[0038] Step S5: Based on beam elements, shell elements, or solid elements, establish a simplified finite element model of the complex independent temporary support system. The nonlinearity includes material nonlinearity and geometric nonlinearity, or a simplified finite element model of the complex independent temporary support system can be equivalently formed by using nonlinear spring elements, denoted as Model2. That is, the simplified finite element model of the complex independent temporary support system can be a rod nonlinear finite element model or a single nonlinear spring element model.

[0039] Step S6: For the simplified finite element model of the complex independent temporary support system in Model2, perform nonlinear static analysis using the Arc-length Method or the Riks Method to obtain the load-displacement curves of the simplified temporary structure.

[0040] Step S7: Adjust the material nonlinearity and geometric nonlinearity model parameters or nonlinear spring parameters of the simplified finite element model of the complex independent temporary support system in Model2 so that the load-displacement curve of the simplified temporary structure approximates the load-displacement curve of the temporary structure.

[0041] Step S8: Add the simplified temporary structure load-displacement curve that meets the approximation requirements to the overall structural finite element model Model0, perform overall structural analysis, form the overall structural finite element equation, and solve it using numerical calculation methods.

[0042] In this embodiment, more preferably, in step S4, the load-displacement curve of the temporary structure is:

[0043] 1 F = 1 f( Q U) (1)

[0044] in, Q U is the generalized displacement at point Q of the temporary structure's load-displacement curve; 1 f(*) is a generalized nonlinear function.

[0045] In this embodiment, more preferably, in step S6, the simplified temporary structure load-displacement curve is as follows:

[0046] 2 F = 2 f( Q U) (2)

[0047] in, Q U represents the generalized displacement at point Q in the simplified load-displacement curve of the temporary structure. 2 f(*) is a generalized nonlinear function.

[0048] In this embodiment, more preferably, step S7 includes: 2 f(*) approaches 1 f(*), until we get:

[0049]

[0050] Where ξ is the convergent minimum value.

[0051] In this embodiment, more preferably, the generalized displacement at point Q of the temporary structure load displacement curve or the generalized displacement at point Q of the simplified temporary structure load displacement curve is a translational displacement or a rotational displacement.

[0052] The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples. The above embodiments only illustrate several implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A simplified analysis method for complex independent temporary support systems, characterized in that, Includes the following steps: Step S1: Delineate the boundary between the temporary structure and the overall structure, denoted as point Q; the temporary structure and the overall structure transfer displacement and force boundaries through point Q. Step S2: Establish the overall structural finite element model; Step S3: Based on beam elements, shell elements, or solid elements, establish a refined nonlinear finite element model of the complex independent temporary support system. The nonlinearity includes material nonlinearity and geometric nonlinearity. Step S4: Perform nonlinear static analysis on the complex independent temporary support system detailed nonlinear finite element model in step S3 using the arc length method or Ritz method to obtain the load-displacement curve of the temporary structure. Step S5: Based on beam elements, shell elements, or solid elements, establish a simplified finite element model of the complex independent temporary support system, wherein the nonlinearity includes material nonlinearity and geometric nonlinearity; or use nonlinear spring elements to equivalently form a simplified finite element model of the complex independent temporary support system. Step S6: Simplify the finite element model of the complex independent temporary support system in step S5, and perform nonlinear static analysis using the arc length method or Ritz method to obtain the load-displacement curve of the simplified temporary structure. Step S7: Adjust the material nonlinearity and geometric nonlinearity or nonlinear spring element parameters of the simplified finite element model of the complex independent temporary support system so that the load-displacement curve of the simplified temporary structure approximates the load-displacement curve of the temporary structure. Step S8: Add the simplified temporary structure load-displacement curve that meets the approximation requirements to the overall structural finite element model, perform overall structural analysis, form the overall structural finite element equation, and solve it using numerical calculation methods.

2. The method according to claim 1, characterized in that, In step S4, the load-displacement curve of the temporary structure is as follows: 1 F= 1 f( Q U) (1) in, Q U is the generalized displacement at point Q of the temporary structure's load-displacement curve; 1 f(*) is a generalized nonlinear function.

3. The method according to claim 2, characterized in that, In step S6, the simplified temporary structure load-displacement curve is as follows: 2 F= 2 f( Q U) (2) in, Q U represents the generalized displacement at point Q in the simplified load-displacement curve of the temporary structure. 2 f(*) is a generalized nonlinear function.

4. The method according to claim 3, characterized in that, Step S7 includes: 2 f(*) approaches 1 f(*), until we get: Where ξ is the convergent minimum value.

5. The method according to claim 3, characterized in that, The generalized displacement at point Q of the temporary structure load-displacement curve, or the generalized displacement at point Q of the simplified temporary structure load-displacement curve, is a translational displacement or a rotational displacement.

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