CN112784386A - Reliability assessment method for towering tower equipment in typhoon weather - Google Patents
Reliability assessment method for towering tower equipment in typhoon weather Download PDFInfo
- Publication number
- CN112784386A CN112784386A CN201911072564.5A CN201911072564A CN112784386A CN 112784386 A CN112784386 A CN 112784386A CN 201911072564 A CN201911072564 A CN 201911072564A CN 112784386 A CN112784386 A CN 112784386A
- Authority
- CN
- China
- Prior art keywords
- tower
- vibration
- wind speed
- analysis
- equipment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
- G06Q10/063—Operations research, analysis or management
- G06Q10/0635—Risk analysis of enterprise or organisation activities
Landscapes
- Business, Economics & Management (AREA)
- Human Resources & Organizations (AREA)
- Engineering & Computer Science (AREA)
- Strategic Management (AREA)
- Entrepreneurship & Innovation (AREA)
- Economics (AREA)
- Operations Research (AREA)
- Game Theory and Decision Science (AREA)
- Development Economics (AREA)
- Marketing (AREA)
- Educational Administration (AREA)
- Quality & Reliability (AREA)
- Tourism & Hospitality (AREA)
- Physics & Mathematics (AREA)
- General Business, Economics & Management (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention belongs to the field of petroleum and chemical engineering safety engineering, and relates to a wind-induced vibration safety evaluation method for towering tower equipment in extreme weather. The method comprises the following steps: calculating the first six-order natural frequency and the corresponding vibration mode of the tower; calculating the critical wind speed when the first six-order vibration mode generates resonance; judging the first several orders of vibration modes of the tower as the vibration to be inspected; calculating the wind pressure and wind speed distribution on the surface of the tower; performing mechanical analysis on the tower; and carrying out fatigue analysis on the tower. The method can comprehensively analyze the stress distribution and the vibration condition of the high-rise tower under the typhoon condition, can reinforce the stress concentrated part in advance, reduces the amplitude of the tower top, and avoids the accidents of leakage, explosion and the like caused by structural failure.
Description
Technical Field
The invention belongs to the field of petroleum and chemical engineering safety engineering, and relates to a wind-induced vibration safety evaluation method for towering tower equipment in extreme weather.
Background
The tower equipment plays an important role in the chemical and petrochemical industries, and the investment accounts for about 30-40% of the total investment of chemical and petrochemical projects. The tower apparatus is a large open-air standing apparatus that is sensitive to wind loads. In recent decades, typhoon disasters frequently occur in coastal areas, typhoon grades are higher and higher, threats are caused to high tower equipment of petrochemical enterprises, and rapid development of the petrochemical industry in China is severely restricted.
The impact of typhoons on tower equipment is divided into two aspects: firstly, the wind pressure causes stress distribution on the surface of the tower equipment, the wind pressure is on the windward side, and the wind suction is on the two sides of the tower equipment and on the leeward side. The maximum stress is concentrated at the joint of the skirt and the tower body and the foundation bolt, so that deformation and fracture are easily caused. In addition, in a certain Reynolds number range, Karman vortex streets can be formed in the lee direction of the tower equipment after wind blows through the tower equipment, and the vortex shedding can cause the vibration of the tower equipment. If the shedding frequency of the vortex is the same as the natural frequency of the tower apparatus, the resonance of the tower apparatus may be caused. Further, if the amplitude of the tower equipment exceeds the maximum allowable value, an accident such as a local breakage or collapse occurs. When evaluating the reliability of tower equipment that stands high in a typhoon, it is necessary to analyze the stress distribution, resonance condition, tower top amplitude (deflection), and fatigue condition of the surface of the tower equipment to evaluate the reliability thereof. The chinese invention patent CN103177301A discloses a typhoon disaster risk estimation method, which establishes a typhoon disaster risk estimation model, and can perform statistical analysis on loss data caused by typhoon disasters in a monitored area, and predict whether the estimated area is disaster-causing and the disaster-causing risk level in a period of time in the future. The patent is mainly used for predicting the disaster damage conditions of all buildings and resident properties in a large-scale area, and the reliability of certain high-rise tower equipment of a chemical enterprise cannot be evaluated. The Chinese patent application CN104599023A discloses a typhoon weather transmission line time-varying reliability calculation method and a risk evaluation system, which can predict the probability distribution of the failure of a transmission line section in a time period in typhoon weather, and realize the small-scale and high-precision prediction of the power transmission line of a power grid. Because the structural difference between the power transmission line and the towering tower equipment in the petrochemical industry is large, the evaluation method provided by the patent cannot be directly applied to reliability evaluation of the tower equipment.
In the prior art, the reliability research on the tower equipment towering under the typhoon has certain limitation, and the reliability of the tower equipment towering under the typhoon cannot be evaluated, so that the development of a method for evaluating the reliability of the tower equipment towering under the typhoon weather is necessary.
Disclosure of Invention
The invention aims to provide a reliability evaluation method for towering tower equipment in typhoon weather, which is used for predicting the stress distribution and vibration condition of the towering tower equipment in typhoon weather by combining theoretical analysis and a numerical simulation method, judging whether the towering tower equipment reaches the fatigue limit or not and calculating the reliability of the tower equipment. The method is suitable for evaluating the reliability of the petrochemical equipment with thin-wall shell structures such as high-rise towers, chimneys, storage tanks and the like in the chemical industry in typhoon weather, and has important significance for researching the wind resistance reliability of petrochemical equipment facilities in extreme weather such as typhoon.
In order to realize the purpose of the invention, the technical means adopted by the invention are as follows: a reliability evaluation method for high-rise tower equipment in typhoon weather comprises the following steps:
calculating the first six-order natural frequency and the corresponding vibration mode of the tower;
calculating the critical wind speed when the first six-order vibration mode generates resonance;
judging the first several orders of vibration modes of the tower as the vibration to be inspected;
calculating the wind pressure and wind speed distribution on the surface of the tower;
performing mechanical analysis on the tower;
and carrying out fatigue analysis on the tower.
The invention further improves the following steps: according to the design parameters of the tower, a mathematical method in JB/T4710-2005 Steel Tower Container or a Modal module of finite element analysis software ANSYS is adopted to carry out Modal analysis, and the first six-order natural frequency and the corresponding mode of the tower are calculated.
The invention further improves the following steps: the calculation formula of the critical wind speed is as follows:
in the formula, vci, critical wind speed at the ith order mode resonance, m/s;
da, outer diameter of the column, mm;
ti, the natural vibration period of the ith order vibration mode of the tower, s;
st, the storuha number, St 0.2 for a tower vessel with a circular cross-section according to GB 50009.
The invention further improves the following steps: the method for judging the vibration to be considered comprises the following steps: according to the measured field wind speed information and the critical wind speed, if the wind speed v is less than vc1, the resonance of the tower does not need to be considered; if vc1< v < vc2, then the vibration of the first mode shape of the tower should be considered; if v > -vc 2, the vibrations of the first and second modes should be considered.
The invention further improves the following steps: the wind pressure and wind speed distribution on the surface of the tower are calculated by establishing a typhoon wind field numerical model of the high-rise tower in a Fluent module of ANSYS software.
The invention further improves the following steps: in the model, the distance from the tower to the inlet boundary is more than 5 times of the outer diameter of the tower; the distance from the tower to the outlet boundary is more than 10 times of the outer diameter of the tower; the gas inlet boundary conditions are determined from wind speed and wind direction information measured by the wind speed sensor.
The invention further improves the following steps: the mechanical analysis comprises static analysis and dynamic analysis.
The invention further improves the following steps: the static analysis or dynamic analysis method comprises the following steps:
and (3) calculating and analyzing the stress distribution, the vibration mode, the vibration frequency and the deflection of the tower top of the tower by adopting a fluid-solid coupling method and taking the calculated wind pressure and wind speed distribution on the surface of the tower as initial conditions for statics analysis or dynamics analysis of the tower.
The invention further improves the following steps: and checking the tower according to the calculated stress distribution and vibration data and the allowable stress and the control value of the deflection of the tower top, and judging whether the tower exceeds a safety critical value after being influenced by typhoon.
The invention further improves the following steps: the fluid-solid coupling method comprises the steps of coupling a fluid calculation module Fluent with a structural module Static Structure and a structural module in a Workbench of ANSYS software, and transmitting tower surface wind pressure information calculated by the Fluent to the structural analysis module Static Structure and the structural module.
The method can comprehensively analyze the stress distribution and the vibration condition of the high-rise tower under the typhoon condition, reinforce the part with concentrated stress in advance, add a damper and the like to change the vibration frequency of the tower, reduce the amplitude of the tower top, ensure the structural safety of the tower under the typhoon, and avoid the accidents of leakage, explosion and the like caused by structural failure.
Drawings
Fig. 1 is a flowchart of a reliability evaluation method for tower equipment in typhoon weather.
Detailed Description
The method for evaluating reliability of tower equipment in typhoon weather according to the present invention will be described in detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can better understand the technical idea of the present invention.
The method for evaluating the reliability of the towering tower equipment in the typhoon weather, as shown in fig. 1, specifically comprises the following steps:
1. according to the selected design parameters such as the size, the material and the like of the high-rise tower, a mathematical method in JB/T4710-2005 Steel Tower Container or a Modal module of finite element analysis software ANSYS is adopted for Modal analysis, and the first six-order natural frequency and the corresponding mode of the tower are calculated.
2. And (3) calculating the critical wind speed of the first six-order resonance of the tower crane according to the calculation method of the critical wind speed in JB/T4710-2005 steel tower container and the first six-order natural frequency in the step 1, as follows:
in the formula, vci, critical wind speed at the ith order mode resonance, m/s;
da, outer diameter of the column, mm;
ti, the natural vibration period of the ith order vibration mode of the tower, s;
st, St Rohm number, taking St as 0.2 for a tower type container with a circular section according to GB 50009;
3. and judging the vibration of the first several vibration modes of the tower to be considered according to the wind speed information measured by the wind speed sensor arranged in the factory. If the wind speed v < vc1, then the tower resonance need not be considered; if vc1< v < vc2, then the vibration of the first mode shape of the tower should be considered; if v > -vc 2, the vibrations of the first and second modes should be considered.
4. And establishing a typhoon field numerical model of the high-rise tower in a Fluent module of ANSYS software. The geometric model is to follow the relevant regulation of building wind load fluid calculation guideline written by the Japan architecture society, in order to avoid the overlap of the outer high-pressure part of the numerical wind tunnel and the inlet boundary and further influence the distribution of the whole pressure, the distance from the tower to the inlet boundary is more than 5 times of the outer diameter of the tower, and simultaneously, in order to reduce the influence of non-physical pressure distribution near the outlet boundary on the pressure around the tower, the distance from the tower to the outlet boundary is more than 10 times of the outer diameter of the tower. The gas inlet boundary conditions are determined from wind speed and wind direction information measured by the wind speed sensor. Through the arrangement, the distribution conditions of the wind pressure and the wind speed on the surface of the tower can be calculated and obtained.
5. And coupling the fluid calculation module Fluent and the structural modules Static Structure and Modal in the Workbench of ANSYS software by adopting a fluid-solid coupling method, transmitting the tower surface wind pressure information obtained by Fluent calculation to the structural analysis modules Static Structure and Modal, and analyzing the stress distribution, vibration mode, vibration frequency, tower top deflection and the like of the tower surface.
6. And (4) checking the tower according to the stress distribution and vibration data calculated in the step 5 and according to allowable stress in JB/T4710-2005 steel tower container and the control value of tower top deflection at home and abroad, and judging whether the tower exceeds a safety critical value after the tower is influenced by typhoon.
7. And (4) carrying out fatigue analysis on the tower according to a fatigue curve in JB-4732 Steel pressure vessel-analysis design Standard, and calculating the fatigue life of the tower.
Through the steps, stress distribution and vibration conditions of the high-rise tower under the typhoon condition can be comprehensively analyzed, the part with concentrated stress can be reinforced in advance, the vibration frequency of the tower is changed by adding a damper and the like, the amplitude of the tower top is reduced, the structural safety of the tower under the typhoon is ensured, and accidents such as leakage, explosion and the like caused by structural failure are avoided.
Claims (10)
1. A reliability evaluation method for high-rise tower equipment in typhoon weather comprises the following steps:
calculating the first six-order natural frequency and the corresponding vibration mode of the tower;
calculating the critical wind speed when the first six-order vibration mode generates resonance;
judging the first several orders of vibration modes of the tower as the vibration to be inspected;
calculating the wind pressure and wind speed distribution on the surface of the tower;
performing mechanical analysis on the tower;
and carrying out fatigue analysis on the tower.
2. The method for evaluating reliability of high-tower equipment in typhoon weather as claimed in claim 1, wherein: according to the design parameters of the tower, a mathematical method in JB/T4710-2005 Steel Tower Container or a Modal module of finite element analysis software ANSYS is adopted to carry out Modal analysis, and the first six-order natural frequency and the corresponding mode of the tower are calculated.
3. The method for evaluating reliability of high-tower equipment in typhoon weather according to claim 2, wherein: the calculation formula of the critical wind speed is as follows:
in the formula, vci, critical wind speed at the ith order mode resonance, m/s;
da, outer diameter of the column, mm;
ti, the natural vibration period of the ith order vibration mode of the tower, s;
st, the storuha number, St 0.2 for a tower vessel with a circular cross-section according to GB 50009.
4. The method for evaluating reliability of high-tower equipment in typhoon weather as claimed in claim 3, wherein: the method for judging the vibration to be considered comprises the following steps: according to the measured field wind speed information and the critical wind speed, if the wind speed v is less than vc1, the resonance of the tower does not need to be considered; if vc1< v < vc2, then the vibration of the first mode shape of the tower should be considered; if v > -vc 2, the vibrations of the first and second modes should be considered.
5. The method for evaluating reliability of high-tower equipment in typhoon weather as claimed in claim 4, wherein: the wind pressure and wind speed distribution on the surface of the tower are calculated by establishing a typhoon wind field numerical model of the high-rise tower in a Fluent module of ANSYS software.
6. The method for evaluating reliability of high-tower equipment in typhoon weather as claimed in claim 5, wherein: in the model, the distance from the tower to the inlet boundary is more than 5 times of the outer diameter of the tower; the distance from the tower to the outlet boundary is more than 10 times of the outer diameter of the tower; the gas inlet boundary conditions are determined from wind speed and wind direction information measured by the wind speed sensor.
7. The method for evaluating reliability of high-tower equipment in typhoon weather according to claim 6, wherein: the mechanical analysis comprises static analysis and dynamic analysis.
8. The method for evaluating reliability of high-tower equipment in typhoon weather as claimed in claim 7, wherein: the static analysis or dynamic analysis method comprises the following steps: and (3) calculating and analyzing the stress distribution, the vibration mode, the vibration frequency and the deflection of the tower top of the tower by adopting a fluid-solid coupling method and taking the calculated wind pressure and wind speed distribution on the surface of the tower as initial conditions for statics analysis or dynamics analysis of the tower.
9. The method for evaluating reliability of high-tower equipment in typhoon weather as claimed in claim 8, wherein: and checking the tower according to the calculated stress distribution and vibration data and the allowable stress and the control value of the deflection of the tower top, and judging whether the tower exceeds a safety critical value after being influenced by typhoon.
10. The method for evaluating reliability of high-tower equipment in typhoon weather as claimed in claim 8, wherein: the fluid-solid coupling method comprises the steps of coupling a fluid calculation module Fluent with a structural module Static Structure and a structural module in a Workbench of ANSYS software, and transmitting tower surface wind pressure information calculated by the Fluent to the structural analysis module Static Structure and the structural module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911072564.5A CN112784386A (en) | 2019-11-05 | 2019-11-05 | Reliability assessment method for towering tower equipment in typhoon weather |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911072564.5A CN112784386A (en) | 2019-11-05 | 2019-11-05 | Reliability assessment method for towering tower equipment in typhoon weather |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112784386A true CN112784386A (en) | 2021-05-11 |
Family
ID=75748828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911072564.5A Pending CN112784386A (en) | 2019-11-05 | 2019-11-05 | Reliability assessment method for towering tower equipment in typhoon weather |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112784386A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114936501A (en) * | 2022-07-20 | 2022-08-23 | 深圳市城市公共安全技术研究院有限公司 | Method and device for evaluating filling degree of vertical oil storage tank under wind pressure |
-
2019
- 2019-11-05 CN CN201911072564.5A patent/CN112784386A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114936501A (en) * | 2022-07-20 | 2022-08-23 | 深圳市城市公共安全技术研究院有限公司 | Method and device for evaluating filling degree of vertical oil storage tank under wind pressure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105468876B (en) | method and system for real-time online evaluation of safety state of power transmission tower | |
| CN102330645A (en) | Health monitoring system and method for wind generator system structure | |
| CN102928213A (en) | Wharf structure anti-fatigue test system and test method | |
| Chen et al. | Damage detection of long-span bridges using stress influence lines incorporated control charts | |
| Han et al. | Coupling analysis of finite element and finite volume method for the design and construction of FPSO crane | |
| CN103955555B (en) | Fatigue life design method for windproof and shockproof high-rise tower | |
| Ribeiro et al. | Wind-induced fatigue analysis of high-rise guyed lattice steel towers | |
| Lu et al. | Wind-induced vibration assessment of tower cranes attached to high-rise buildings under construction | |
| CN112784386A (en) | Reliability assessment method for towering tower equipment in typhoon weather | |
| CN104264589B (en) | A kind of Hanging Basket status real time monitor method | |
| Fu et al. | Vortex-induced vibration and countermeasure of a tubular transmission tower | |
| Ju | Increasing the fatigue life of offshore wind turbine jacket structures using yaw stiffness and damping | |
| Zhao et al. | Experimental study on the bearing capacity and fatigue life of lightning rod structure joints in high-voltage substation structures | |
| CN117309060B (en) | Building curtain wall structure performance monitoring system based on cloud computing | |
| CN113358313A (en) | Method for testing looseness of bolts of power transmission iron tower | |
| Li et al. | Failure criteria and wind-induced vibration analysis for an offshore platform jacking system | |
| CN116756504A (en) | Underground factory building environment monitoring model and trend early warning algorithm | |
| Pollino et al. | In-situ measurements of fatigue demands on a wind turbine support structure | |
| Belver et al. | Enhanced vortex shedding in a 183 m industrial chimney | |
| Xiong et al. | Integrated fatigue assessment method considering average stress effects of large-scale lattice wind turbine support structures | |
| Jayarajan | Seismic fragility assessment of a pipe rack structure in a petrochemical complex by incremental dynamic analysis | |
| Khosrowjerdi et al. | Effect of wind load on combined arches in dome buildings | |
| Niu | Ellipse phenomenon and oval phenomenon found in fault diagnoses of tower-mast structures and experimental verification | |
| Henriques et al. | Design of Lattice Wind Towers and Comparison with the Typical Self-Supported Tubular Towers | |
| Yang et al. | What are the appropriate target safety level and corresponding partial load safety factor for bolted joints on wind turbine tower frame? |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |