CN103886161A - Steel structure fire resistance design method based on ESSFF - Google Patents
Steel structure fire resistance design method based on ESSFF Download PDFInfo
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- CN103886161A CN103886161A CN201410136930.XA CN201410136930A CN103886161A CN 103886161 A CN103886161 A CN 103886161A CN 201410136930 A CN201410136930 A CN 201410136930A CN 103886161 A CN103886161 A CN 103886161A
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Abstract
The invention discloses a steel structure fire resistance design method based on the ESSFF. The steel structure fire resistance design method based on the ESSFF comprises the steel structure fire resistance design before fire treatment and steel structure reinforcement and restoration design after fire treatment. The steel structure fire resistance design before fire treatment comprises the specific steps that an in-situ temperature field when a fire occurs is determined through the ESSFF, the elevated temperature of a steel structural member is determined through calculation when the fire occurs, the yield strength and the elasticity modulus of the steel structure member under the high temperature condition are calculated, and the fire resistance design of the steel structure member is conducted. Compared with the prior art, the steel structure fire resistance design method based on the ESSFF has the advantages that the ESSFF is adopted to serve as a design tool, the steel structure member is designed according to the influence of the temperature field on a fire site on the steel structure member, and the requirement of the steel structure member for fire resistance is met; meanwhile, by the adoption of the method, reinforcement and recovery of the fire resistance of the steel structure member can be achieved after the fire, and the fire resistance of the steel structure is improved.
Description
Technical field
The invention belongs to the anti-fiery design field of steel building, relate to a kind of Design of Steel Structures Against Fire method based on expert system.
Background technology
Along with the fast development of computer technology, every field is all utilizing computerese (Visual C++ ﹑ Visual Basic etc.) coding to solve corresponding challenge.At present, domestic at Steel Structural Design aspect developing 3D3S space bar Steel Structure CAD Software, STS software etc., lack at the comparison of anti-fiery design aspect.Design of Steel Structures Against Fire expert system (ESSFF) software of exploitation of the present invention, as instrument, for Design of Steel Structures Against Fire provides quantitative foundation, standardizes Design of Steel Structures Against Fire more, rationalizes.
Summary of the invention
Goal of the invention: technical matters to be solved by this invention is for prior art deficiency, and a kind of Design of Steel Structures Against Fire method based on Fire-resistance of Steel Structures expert system that fire resistance requires that meets is provided.
Technical scheme: the invention discloses a kind of Design of Steel Structures Against Fire method based on Fire-resistance of Steel Structures expert system, the method comprises following part:
1) Design of Steel Structures Against Fire before overdoing, concrete steps are:
11) scene temperature field while determining fire by Fire-resistance of Steel Structures expert system (ESSFF);
12) based on scene temperature field in step 11), steel structure member rising temperature when calculative determination fire;
13) result of calculation based in described step 12), yield strength and the elastic modulus of steel structure member under calculating high temperature;
14) yield strength based in described step 13) and elastic modulus, carries out the anti-fire design of steel structure member;
2) overdo after steel structure reinforcing with repair design, concrete steps are:
21), by Fire-resistance of Steel Structures expert system (ESSFF), determine the actual temperature field of steel construction after overdoing;
22) based on described step 21) in definite actual temperature field, calculate overdo after the Residual Load Bearing Capacity of steel construction;
23) based on described step 22) the middle Residual Load Bearing Capacity calculating, the impairment scale of steel construction after definite overdoing;
24) based on described step 22) and step 23) in Residual Load Bearing Capacity and the impairment scale of steel construction, design is reinforced and repaired to steel construction after overdoing.
The anti-fire design of steel structure member in described step 14), specifically designs according to compression member, flexural member, bending component according to member stress feature.
Described step 22) in the Residual Load Bearing Capacity of calculating steel construction, specifically calculate according to compression member, flexural member, bending component according to member stress feature.
Definite method of the actual temperature field of described step 11) is: specific heat, density, coefficient of heat conductivity, fire load density, equivalent dryness-fire Time Calculation room air rising temperature that combustible is provided to Fire-resistance of Steel Structures expert system (ESSFF).
Compared with prior art, the present invention adopts expert system (ESSFF) as design tool, by temperature field, scene of fire is designed steel structure member the impact of steel structure member, thereby meet the requirement of steel structure member to fire resistance, simultaneously, by invention of the present invention, can also carry out to the steel structure member after fire reinforcing and the reparation of fire resistance, improve the fire resistance of steel construction.
Accompanying drawing explanation
Fig. 1 is expert system (ESSFF) ingredient;
The Design of Steel Structures Against Fire method flow of Fig. 2 based on expert system (ESSFF);
Fig. 3 is that the gross thermal value discharging after combustible burning in proposed building calculates;
Fig. 4 is that in proposed building, fire load density calculates;
Fig. 5 is that in proposed building room, atmosphere temperature rising size is calculated;
Fig. 6 is proposed building member temperature temporal evolution curve calculation under fire effect;
Fig. 7 is steel structure member design before overdoing;
Fig. 8 is the anti-fire analysis of steel construction entirety before overdoing;
Fig. 9 is building structure processing flow chart after overdoing;
Figure 10 is steel building lesion assessment flow process after overdoing;
Figure 11 is steel building lesion assessment content after overdoing;
Figure 12 is scene of fire exploration content and process;
Figure 13 is steel structure reinforcing reparation design cycle after overdoing.
Embodiment
Below in conjunction with drawings and Examples, this invention is done further and illustrated.Fig. 1 is the composition of expert system (ESSFF), and Fig. 2 is the process flow diagram of the Design of Steel Structures Against Fire based on expert system (ESSFF).
The present invention mainly comprise Design of Steel Structures Against Fire before overdoing and overdo after steel structure reinforcing reparation design.
1) the anti-fiery design analysis of steel construction before fire
The emphasis of this part is to be mainly partial to the front Design of Steel Structures Against Fire analysis of fire, mainly considers the following aspects:
A) consider fire protection design from building angle
The main fire prevention classification of considering buildings, fire compartment, and the fire resistance rating of structural elements.
B) primary data before Design of Steel Structures Against Fire is determined
The primary data (load, boundary condition etc.) that Design of Steel Structures Against Fire is provided to expert system, forms fire combustion model (temperature-time curve) by expert system, and proposes fire prevention measure (as fire proofing material).
C) Analysis of Bearing Capacity of structural entity and member under high temperature
By steel frame Nonlinear Finite metaprogram under the high temperature of establishment, the load-bearing capacity of steel frame under high temperature is analyzed; the load level bearing according to fire lower member, bearing boundary condition, the protective layer thickness of member etc. of member are tried to achieve component internal force while reaching fire resistance period, then the anti-fiery bearing capacity of member are checked.
D) judge the ability of Fire-resistance of Steel Structures
By comparative analysis, draw the anti-fiery limit capacity of structure, and judge whether to meet the fire-resistant requirement of regulation and stipulation.
2) overdo after steel construction reinforcing repair design analysis
The emphasis of this part is mainly that after being partial to fire, steel structure reinforcing is repaired design analysis, considers the following aspects:
A) situ appraisal after fire and evaluation
The primary data of scene of fire is provided to expert system, infer fire combustion model (temperature-time curve) by expert system, and judge that actual maximum temperature, structural elements local damage degree and structure burning in structure fire process destroy duration.
B) Analysis of Bearing Capacity of structural entity and member after fire
By steel construction Nonlinear Finite metaprogram under the high temperature of establishment, the load-bearing capacity of steel construction under high temperature is analyzed, and drawn fire endurance time and the residual bearing capacity of steel construction.
C) after steel construction fire, diagnose
By the computational analysis comparison of expert system, structural entity and single member are made to the judgement of destructiveness.
D) restored project after steel construction fire is proposed
In conjunction with certain economic target and fire prevention measure, the restored project to structure after fire is proposed.
Below by embodiment, these two kinds of designs are described.
embodiment 1:
This embodiment introduces the Design of Steel Structures Against Fire before overdoing in detail.
Deviser operates according to Fig. 3, by proposed building fuel type, distribution, with quantity input expert system, if this kind of combustible information not in expert system information bank, can add to expert system by the mode of man-machine interaction, can calculate like this gross thermal value discharging after combustible burning in proposed building; Operate according to Fig. 4, the input information expert system such as gross thermal value, the thermal inertia in catch fire room area and the room that catches fire that proposed building combustible is discharged, can calculate fire load density in proposed building; Operate according to Fig. 5, by fire load density in proposed building and the room opening size input expert system of catching fire, can calculate the equivalent dryness-fire time of proposed building under actual fire, according to the equivalent dryness-fire time, utilize iso standard fire intensification computing formula can calculate the size of atmosphere temperature rising in proposed building room; Operate according to Fig. 6; by input information expert systems such as the thermophysical parameter of proposed building protective material, member section type, room air maximum temperature and equivalent dryness-fire times, can calculate the time dependent curve of temperature of proposed building member.
Operate according to Fig. 7, can carry out anti-fire design to steel structure member before overdoing, comprise the anti-fire design of axis compression member, the anti-fire design of flexural member and the anti-fire design of curved pressure member; And can realize three kinds of anti-fiery design processes of steel structure member, comprise: the 1) fire resistance period of known members, demand protective layer thickness; 2) protective layer thickness of known members, demand fire resistance period; 3) known members protective layer thickness and fire resistance period, whether checking computations member fire resistance meets the demands.
Operate according to Fig. 8, can analyze steel construction entirety fire resistance before overdoing, by proposed building geological information, material information, load information and temperature information input expert system, can obtain the reaction (inner force and displacement size) of proposed building under high temperature fire effect.
embodiment 2:
This embodiment introduces the Design of Steel Structures Against Fire after overdoing in detail.
Fig. 9 is building structure processing flow chart after overdoing; Figure 10 is steel building lesion assessment process flow diagram after overdoing; Figure 11 is the content of steel building lesion assessment after overdoing, and comprises evaluation three parts that member is identified, unit is identified and identified to subelement, and every part is assessed security, usability and reliability again; Figure 12 is scene of fire exploration content and process, operates according to Figure 12, can understand scene of fire situation; Operate according to Figure 13, by field investigation situation input expert system after fire, after can being caught fire the maximum temperature of structure and catch fire after structure temperature field distribute, again structure partial damage and entirety damage are waited to input information expert system, can obtain the Residual Load Bearing Capacity of structure after fire, then carry out safety evaluation, propose rational restored project.
Claims (4)
1. the Design of Steel Structures Against Fire method based on Fire-resistance of Steel Structures expert system, is characterized in that, the method comprises following part:
1) Design of Steel Structures Against Fire before overdoing, concrete steps are:
11) scene temperature field while determining fire by Fire-resistance of Steel Structures expert system;
12) based on scene temperature field in step 11), steel structure member rising temperature when calculative determination fire;
13) result of calculation based in described step 12), yield strength and the elastic modulus of steel structure member under calculating high temperature;
14) yield strength based in described step 13) and elastic modulus, carries out the anti-fire design of steel structure member;
2) overdo after steel structure reinforcing with repair design, concrete steps are:
21), by Fire-resistance of Steel Structures expert system, determine the actual temperature field of steel construction after overdoing;
22) based on described step 21) in definite actual temperature field, calculate overdo after the Residual Load Bearing Capacity of steel construction;
23) based on described step 22) the middle Residual Load Bearing Capacity calculating, the impairment scale of steel construction after definite overdoing;
24) based on described step 22) and step 23) in Residual Load Bearing Capacity and the impairment scale of steel construction, design is reinforced and repaired to steel construction after overdoing.
2. according to the Design of Steel Structures Against Fire method based on Fire-resistance of Steel Structures expert system claimed in claim 1, it is characterized in that, the anti-fire design of steel structure member in described step 14), specifically designs according to compression member, flexural member, bending component according to member stress feature.
3. according to the Design of Steel Structures Against Fire method based on Fire-resistance of Steel Structures expert system claimed in claim 1, it is characterized in that,
Described step 22) in the Residual Load Bearing Capacity of calculating steel construction, specifically calculate according to compression member, flexural member, bending component according to member stress feature.
4. according to the Design of Steel Structures Against Fire method based on Fire-resistance of Steel Structures expert system claimed in claim 1, it is characterized in that, definite method of the actual temperature field of described step 11) is: specific heat, density, coefficient of heat conductivity, fire load density, equivalent dryness-fire Time Calculation room air rising temperature that combustible is provided to Fire-resistance of Steel Structures expert system.
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| CN201410136930.XA CN103886161A (en) | 2014-04-04 | 2014-04-04 | Steel structure fire resistance design method based on ESSFF |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106767718A (en) * | 2016-12-21 | 2017-05-31 | 中国矿业大学 | Steel building caves in risk monitoring method in fire |
| CN111539146A (en) * | 2020-04-27 | 2020-08-14 | 中船第九设计研究院工程有限公司 | Integral structure fire resistance limit calculation method based on regional temperature rise analysis |
-
2014
- 2014-04-04 CN CN201410136930.XA patent/CN103886161A/en active Pending
Non-Patent Citations (4)
| Title |
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| JELLE WITTEVEEN 等: "A Critical View on the Results of Standard Fire Resistance Tests on Steel Columns", 《FIRE SAFETY JOURNAL》 * |
| 李国强 等: "耐火钢梁的抗火性能参数分析与抗火设计", 《钢结构》 * |
| 范圣刚 等: "火灾后网架结构的加固与修复设计", 《工业建筑》 * |
| 范圣刚: "钢结构抗火分析及其专家系统（ESSFF）编制", 《中国学位论文全文数据库》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106767718A (en) * | 2016-12-21 | 2017-05-31 | 中国矿业大学 | Steel building caves in risk monitoring method in fire |
| CN106767718B (en) * | 2016-12-21 | 2019-06-14 | 中国矿业大学 | Steel building collapsing risk monitoring method in fire |
| CN111539146A (en) * | 2020-04-27 | 2020-08-14 | 中船第九设计研究院工程有限公司 | Integral structure fire resistance limit calculation method based on regional temperature rise analysis |
| CN111539146B (en) * | 2020-04-27 | 2022-03-11 | 中船第九设计研究院工程有限公司 | Integral structure fire resistance limit calculation method based on regional temperature rise analysis |
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