Factory building structure anti-micro-vibration optimization design method

Abstract

The invention relates to the technical field of micro-vibration prevention of civil engineering structures, and particularly provides a factory building structure micro-vibration prevention optimization design method which comprises the following steps: measuring acceleration response of an external environment to be built of a factory building, and performing frequency domain analysis; according to the plant building requirement and the anti-micro-vibration level requirement, plant structure arrangement is conducted; a finite element model is established, the measured environment acceleration response serves as input excitation, and the speed response of each point of the structure is calculated through time-history analysis; selecting representative points; performing 1 / 3 octave analysis on the speed response of the selected point, comparing the speed response in the horizontal direction and the speed response in the vertical direction with micro-vibration response limit values required by design, adjusting the sectional dimensions of columns, beams and plates of the plant structure according to the comparison result, and performing recalculation. The invention provides a systematic factory building structure anti-micro-vibration optimization design method. And the structure can be optimized more comprehensively, and the economical efficiency of the structure is improved. And the design efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-micro-vibration of civil engineering structures, and in particular relates to an optimization design method for anti-micro-vibration of a plant structure. Background Art

[0002] With the development of the times, modern high-tech products have higher and higher requirements for the precision of production and processing, especially electronic products such as chips and panels. The equipment used to produce these products often requires micron or even nanometer precision. Under such conditions, the slight vibration brought by the environment may have a great impact on the equipment. In serious cases, it may also affect the normal use of the equipment, reduce the service life of the equipment, affect the processing accuracy of the product, and reduce the product yield. Therefore, for the production plant of such products, anti-micro-vibration design is of great significance and is also an important consideration in plant design and planning.

[0003] In the anti-micro-vibration design of factory buildings, by optimizing the structural scheme and improving the anti-micro-vibration ability of the structure itself, no additional subsystem is often required. It has significant advantages in terms of economy and is the preferred solution for anti-micro-vibration design. However, my country has not been conducting research in the field of structural anti-micro-vibration design for a long time, and the relevant technology is not yet mature. There are mainly the following problems:

[0004] 1) Lack of systematic anti-micro-vibration design theory and methods;

[0005] 2) The relevant technology is not mature enough, which leads to the design and planning of many engineering projects relying on foreign consulting agencies, resulting in high project design costs;

[0006] 3) The current factory building structure design is conservative, resulting in the structural components being often larger in size, and the economy of factory building construction needs to be improved.

[0007] With the development of my country's electronic technology industry, the demand for related industrial plants is increasing, and higher requirements are placed on the anti-micro-vibration ability of plants. Therefore, the anti-micro-vibration optimization design of plant structures is of great significance for improving the economic efficiency of plant project construction, strengthening the technical level of plant structure design in my country, and promoting the development of my country's high-tech industries. Summary of the invention

[0008] In view of the problems existing in the above-mentioned prior art, the present invention provides a method for optimizing the design of anti-micro-vibration of a factory building structure. The method comprehensively considers the coupling effects of components such as beams, plates, columns, etc. in the structure and their influence on the micro-vibration response, and systematically and efficiently iteratively optimizes the design of the factory building structure, so that the design result meets the requirements of anti-micro-vibration while having good economy.

[0009] The present invention proposes a method for optimizing the design of anti-micro-vibration of a plant structure, comprising the following steps:

[0010] Step 1: Measure the acceleration response of the external environment of the planned plant and conduct frequency domain analysis;

[0011] Step 2: Arrange the plant structure according to the plant building requirements and anti-micro-vibration level requirements;

[0012] Step 3: Establish a finite element model of the plant structure, use the measured environmental acceleration response as input excitation, and calculate the velocity response of each point of the structure through time history analysis;

[0013] Step 4: Select representative points of the target number;

[0014] Step 5: Perform 1 / 3 octave band analysis on the velocity response of the selected point, compare the velocity response in the horizontal direction with the micro-vibration response limit required by the design, adjust the cross-sectional size of the column of the plant structure according to the comparison result, and recalculate the velocity response in the horizontal direction;

[0015] Step 6: Compare the vertical velocity response with the micro-vibration response limit required by the design, adjust the cross-sectional dimensions of the beams and slabs of the plant structure according to the comparison results, and recalculate the vertical velocity response;

[0016] Step 7: Determine whether the horizontal velocity response and the vertical velocity response both meet the micro-vibration response limit of the design requirements. If not, return to step 5 until the design requirements are met.

[0017] Furthermore, in step 5, the step of comparing the velocity response in the horizontal direction with the micro-vibration response limit required by the design, and adjusting the cross-sectional size of the column of the plant structure according to the comparison result includes:

[0018] Determine whether the velocity response in the horizontal direction meets the micro-vibration response limit required by the design:

[0019] If not, increase the column section size;

[0020] If so, and it is below the preset ratio of the limit, the column section size is reduced.

[0021] Furthermore, in step 6, the step of comparing the vertical velocity response with the micro-vibration response limit required by the design, and adjusting the cross-sectional dimensions of the beams and plates of the plant structure according to the comparison result includes:

[0022] Determine whether the vertical velocity response meets the micro-vibration response limit required by the design:

[0023] If not, increase the cross-sectional dimensions of the beams and slabs at the over-limit points;

[0024] If so, and it is lower than the preset ratio of the limit, the cross-sectional dimensions of the beam and slab are reduced.

[0025] Furthermore, in step 6, the target ratio of plate thickness to beam height is 1 / 2-1 / 1; when the vertical velocity response does not meet the micro-vibration response limit required by the design, the thickness of the plate is increased.

[0026] Increasing the plate thickness can more effectively control the micro-vibration of the structure and ensure the rationality of the beam and plate dimensions.

[0027] Furthermore, in step 6, the target ratio of the beam section width to the height is 1 / 4-1 / 2.

[0028] Furthermore, in step 6, when adjusting the cross-sectional dimensions of the beams and slabs of the factory building structure, if the 1 / 3 octave maximum velocity response of the selected point increases after increasing the cross-sectional dimensions of the beams and slabs, then the cross-sectional dimensions of the beams are adjusted to analyze whether the velocity response can be reduced. If so, this is used as the cross-sectional dimension of the beams for further analysis.

[0029] If the maximum response increases after increasing the cross-sectional dimensions of beams and plates, it indicates that resonance may exist. By adjusting the cross-sectional dimensions of beams, the structure can better avoid the resonance range of environmental excitation, thereby improving the economy of the structure.

[0030] Furthermore, in the finite element analysis in step 3, the external excitation is input in the form of acceleration boundary conditions at the bottom of the vertical components of the plant structure.

[0031] Compared with existing methods such as the large mass method and the large stiffness method, the calculation results of this method can better reflect the micro-vibration response of the actual structure and avoid the morbid and stability problems in numerical calculations.

[0032] Furthermore, the vertical components include columns and shear walls of the factory building structure.

[0033] Furthermore, the step 1 includes: measuring the horizontal acceleration response and vertical acceleration response of the environment where the factory building is to be built by an acceleration sensor, with a sampling frequency of not less than 160 Hz, and performing frequency domain analysis on the collected data.

[0034] Compared with displacement and velocity, the acceleration response of environmental excitation is easier to measure and has higher measurement accuracy. Since the main frequency domain range of environmental excitation is between 0 and 80 Hz, the sampling frequency should not be lower than 160 Hz to ensure that the frequency domain analysis results can cover a sufficient frequency domain range.

[0035] Furthermore, in step 3, the measurement points used for measuring the excitation cover the surroundings of the planned construction site of the plant and multiple working conditions in the environmental vibration. Each measurement point records two orthogonal excitations in the horizontal and vertical directions, and the excitation with the most unfavorable spectral characteristics is selected as the input excitation.

[0036] Since the structural optimization design process involves the process of considering horizontal and vertical responses separately, the environmental excitation measured by this method can make the calculation results more reliable and closer to reality.

[0037] The beneficial effects of the present invention are:

[0038] 1) A more systematic optimization design method for anti-micro-vibration of factory building structures was proposed.

[0039] 2) In the structural optimization design, beams, plates, columns and other components are comprehensively considered, which can optimize the structure more comprehensively, thereby better improving the economic efficiency of the structure.

[0040] 3) Taking into account the influence characteristics of different types of components on the micro-vibration response of the structure, the iterative design speed is often faster, which improves the design efficiency.

[0041] 4) Taking into account the structural resonance phenomenon caused by environmental excitation, the structure can better avoid the resonance range of environmental excitation, which is beneficial to improving the economy of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a flow chart of the present invention.

[0043] Figure 2 This is the electronic factory environment vibration acceleration time history response data obtained by the method of the present invention.

[0044] Figure 3 This is the frequency domain amplitude spectrum of the electronic plant environment vibration acceleration obtained by the method of the present invention.

[0045] Figure 4 This is a three-dimensional diagram of the finite element model of the plant structure established by the method of the present invention.

[0046] Figure 5 Schematic diagram of the plane positions of points P1 and P2 selected in the electronic factory building of the method of the present invention.

[0047] Figure 6 This is a 1 / 3 octave speed response amplitude diagram of point P1 obtained by finite element simulation of the method of the present invention.

[0048] Figure 7 This is a 1 / 3 octave speed response amplitude diagram of point P2 obtained by finite element simulation of the method of the present invention. DETAILED DESCRIPTION

[0049] The present application is further described in detail below with reference to the accompanying drawings and specific implementations:

[0050] This embodiment takes a certain electronic factory project in Shanghai as an example to explain in detail the specific implementation mode of the present invention.

[0051] like Figure 1 As shown in the figure, the steps of the anti-micro-vibration optimization design method for the plant structure are as follows:

[0052] Step (1): Measure the acceleration response of the environment where the factory building is to be built and perform frequency domain analysis.

[0053] The horizontal and vertical acceleration responses were measured by using an acceleration sensor at the proposed site of the plant. The sampling frequency domain of the acquisition instrument used in the measurement process was 200Hz, and measurements were made at multiple locations around the proposed site of the plant. The final selected environmental acceleration time history response data is as follows: Figure 2 As shown, the X and Y directions correspond to the two horizontal directions, and the Z direction corresponds to the vertical direction. The Fourier transform of the collected data is performed to obtain the acceleration amplitude spectrum of the environmental excitation as shown in Figure 3 shown.

[0054] Step (2): Arrange the structure according to the building requirements and the anti-micro-vibration level requirements.

[0055] The main structure of the plant has three floors, and the anti-micro-vibration level requirements are based on the internationally accepted VC standard (Vibration Criteria). The anti-micro-vibration level requirements for individual areas on the 1st and 2nd floors are VC-B, and the main part of the 3rd floor is the clean production area, and the corresponding anti-micro-vibration level requirements are VC-D. Since the clean production area is the core content of the anti-micro-vibration design, the subsequent optimization design is mainly based on this area. Due to the high anti-micro-vibration requirements in this area, dense columns are set under this area to improve the stiffness of the floor. The dimensions of the main structural components in this area are shown in Table 1. The corresponding VC-D standard requires that the 1 / 3 octave speed response in the range of 1 to 80 Hz does not exceed 6.25μm / s.

[0056] Table 1 Structural dimensions of main components in clean production area

[0057] Component Type plate Liang column Cross-section size 650mm 350mm×800mm 700mm×700mm

[0058] Step (3): Use ABAQUS software to establish a finite element model of the plant structure, input the environmental acceleration response measured in step (1) into the plant structure as an excitation, and calculate the velocity response of each point of the structure through time history analysis. The established finite element model of the plant structure is as follows: Figure 4 As shown in Figure 1, the acceleration excitation is input as acceleration boundary conditions at the bottom nodes of vertical components such as columns and shear walls.

[0059] Step (4): Based on the calculated velocity response, select a certain number of representative points as analysis points. The following description takes two points P1 and P2 in the clean production area as an example. The positions of P1 and P2 are as follows: Figure 5 shown.

[0060] Step (5): Perform 1 / 3 octave analysis on the velocity response of P1 and P2 to determine whether the velocity response in the horizontal direction meets the micro-vibration response limit of the design requirements. If it does not meet the requirements, increase the column section size. If it meets the requirements and is less than 70% of the limit, appropriately reduce the column section size to keep it within the limit range and then recalculate. For the structure shown in Table 1, the 1 / 3 octave amplitude of the velocity response at points P1 and P2 is as follows: Figure 6 and Figure 7 By changing the cross-sectional dimensions of the column, the maximum values ​​of the 1 / 3 octave velocity responses of P1 and P2 in the horizontal direction are shown in Table 2. Based on the above results, the cross-sectional dimensions of the column are selected as 550 mm × 550 mm for subsequent analysis.

[0061] Table 2 Maximum 1 / 3 octave velocity response of P1 and P2 under different column sizes (μm / s)

[0062]

[0063] Step (6): Determine whether the vertical velocity response of the selected point meets the micro-vibration response limit required by the design. If not, increase the cross-sectional dimensions of the beam and slab at the exceeding point. If it meets the requirements and is lower than 80% of the limit, appropriately reduce the cross-sectional dimensions of the beam and slab, and then recalculate until the structure is in the optimal state. The cross-sectional dimensions of the beam and slab are changed respectively, and the maximum values ​​of the 1 / 3 octave velocity response in the vertical direction of P1 and P2 are obtained as shown in Table 3. According to the analysis results, the cross-sectional dimensions of the beam are taken as 250×800 and the thickness of the slab is taken as 600mm.

[0064] Table 3 Maximum 1 / 3 octave velocity response of P1 and P2 under different beam and plate cross-sectional dimensions (μm / s)

[0065]

[0066] Step (7): Analyze the optimized structure again to check whether the response of each point exceeds the limit. At this time, the velocity response of each point meets the requirements of the VC standard. Finally, the cross-sectional dimensions of the column are determined to be 550mm×550mm, the cross-sectional dimensions of the beam are 250mm×800mm, and the thickness of the plate is 600mm. Through the above optimization design, not only can the structure meet the requirements of anti-microvibration, but the dimensions of the beams, columns, and plates are also more economical.

[0067] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A method for optimizing the design of anti-micro-vibration of a plant structure, characterized in that: The following steps are involved: Step 1: Measure the acceleration response of the external environment of the planned plant and conduct frequency domain analysis; Step 2: Arrange the plant structure according to the plant building requirements and anti-micro-vibration level requirements; Step 3: Establish a finite element model of the plant structure, use the measured environmental acceleration response as input excitation, and calculate the velocity response of each point of the structure through time history analysis; Step 4: Select representative points of the target number; Step 5: Perform 1 / 3 octave band analysis on the velocity response of the selected point, compare the velocity response in the horizontal direction with the micro-vibration response limit required by the design, adjust the cross-sectional size of the column of the plant structure according to the comparison result, and recalculate the velocity response in the horizontal direction; Step 6: Compare the vertical velocity response with the micro-vibration response limit required by the design, adjust the cross-sectional dimensions of the beams and slabs of the plant structure according to the comparison results, and recalculate the vertical velocity response; Step 7: Determine whether the horizontal velocity response and the vertical velocity response both meet the micro-vibration response limit of the design requirements. If not, return to step 5 until the design requirements are met.

2. The method for optimizing the anti-micro-vibration design of a plant structure according to claim 1 is characterized in that: In step 5, the step of comparing the velocity response in the horizontal direction with the micro-vibration response limit required by the design, and adjusting the cross-sectional size of the column of the plant structure according to the comparison result includes: Determine whether the velocity response in the horizontal direction meets the micro-vibration response limit required by the design: If not, increase the column section size; If so, and it is below the preset ratio of the limit, the column section size is reduced.

3. The method for optimizing the anti-micro-vibration design of a plant structure according to claim 1 is characterized in that: In step 6, the step of comparing the vertical velocity response with the micro-vibration response limit required by the design, and adjusting the cross-sectional dimensions of the beams and slabs of the plant structure according to the comparison result includes: Determine whether the vertical velocity response meets the micro-vibration response limit required by the design: If not, increase the cross-sectional dimensions of the beams and slabs at the over-limit points; If so, and it is lower than the preset ratio of the limit, the cross-sectional dimensions of the beam and slab are reduced.

4. The method for optimizing the anti-micro-vibration design of a plant structure according to claim 3 is characterized in that: In step 6, the target ratio of plate thickness to beam height is 1 / 2-1 / 1; when the vertical velocity response does not meet the micro-vibration response limit required by the design, the thickness of the plate is increased.

5. The method for optimizing the design of anti-micro-vibration of a plant structure according to claim 4 is characterized in that: In step 6, the target ratio of the beam section width to the height is 1 / 4-1 / 2.

6. The method for optimizing the anti-micro-vibration design of a plant structure according to claim 3 is characterized in that: In step 6, when adjusting the cross-sectional dimensions of the beams and slabs of the plant structure, if the 1 / 3 octave maximum velocity response of the selected point increases after increasing the cross-sectional dimensions of the beams and slabs, the cross-sectional dimensions of the beams are adjusted to analyze whether the velocity response can be reduced. If so, this is used as the cross-sectional dimension of the beams for further analysis.

7. The method for optimizing the design of anti-micro-vibration of a plant structure according to claim 1, characterized in that: In the finite element analysis in step 3, the external excitation is input in the form of acceleration boundary conditions at the bottom of the vertical components of the plant structure.

8. The method for optimizing the design of anti-micro-vibration of a plant structure according to claim 7 is characterized in that: The vertical components include columns and shear walls of the factory building structure.

9. The method for optimizing the anti-micro-vibration design of a plant structure according to claim 1, characterized in that: The step 1 comprises: measuring the horizontal acceleration response and the vertical acceleration response of the environment where the plant is to be built by means of an acceleration sensor, with a sampling frequency of not less than 160 Hz, and performing frequency domain analysis on the collected data.

10. The method for optimizing the design of anti-micro-vibration of a plant structure according to claim 1, characterized in that: In step 3, the measurement points used for measuring the excitation cover the surroundings of the planned construction site of the plant and multiple working conditions in the environmental vibration. Each measurement point records two orthogonal excitations in the horizontal and vertical directions, and the excitation with the most unfavorable spectral characteristics is selected as the input excitation.

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