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Numerical Simulation of Fire Smoke Spread in a Super High-Rise Building for Different Fire Scenarios.

1. Introduction

With the rapid development of modern urban processes and the progress of architectural science and technology, numerous super high-rise buildings continue to be constructed [1-4]. Some super high-rise buildings have become prominent symbols of city modernization and urbanization, particularly those in metropolitan areas, such as the Burj Khalifa in Dubai, Shanghai Tower, and Goldin Finance 117 in Tianjin. Super high-rise buildings bring people enjoyment and optimize the land area used. However, the height and number of these buildings increases, so do the number and variety of internal combustibles. Problems associated with super high-rise buildings, such as vertical traffic problems, structural problems, and security concerns, have also become increasingly prominent [5-9].

Compared with general building fires, super high-rise building fires have unique characteristics [10]: (1) fire spreads quickly, (2) super high-rise buildings have numerous fire hazards, (3) complex building structures and boundary environments cause particular fire evolution behaviors, (4) crowd evacuation in super high-rise buildings is a major safety concern, (5) fire rescue is difficult and the amount of time required to fight a fire is long, allowing the fire to readily spread, and (6) fires cause substantial loss and grave social consequences. Therefore, identifying methods for effectively preventing the occurrence, development, and spread of fire in super high-rise buildings, ensuring safe evacuation of internal personnel, and reducing casualties and property damage have become crucial concerns in the field of firefighting [11-15]. In the current research on high-rise building fires, NFPA92B is the most widely recognized and used. At the same time, researchers generally conduct research through theoretical analysis, numerical simulation, and CFD simulation methods, mainly to study the spread of smoke and evacuation of people in high-rise building fire.

Zhu et al. [16] conducted research on smoke control in super high-rise building fires. Based on the CCTV North Building fire, Hou et al. [17] numerically simulated the fire spread and temperature distribution of high-rise buildings. Liu et al. [18] analyzed in detail the fire causes of high-rise building fires and proposed protective measures to facilitate evacuation. Yang et al. [19] also simulated the variation of smoke and temperature fields in a high-rise residential building in Japan by numerical simulation. Xia [20] simulated the spread of fire smoke in an elevator shaft of a high-rise building, and Cheng and Hadjisophocleous [21] produced a dynamic model of fire spread that investigated the spread of fire in both horizontal and vertical directions. Jiang et al. [22] published an independent review of the performance of Shanghai Tower in the event of a fire. Sun et al. [23] reviewed the contemporary research on the dynamics of fires in high-rise buildings. Zhang and Ren [24] used a super high-rise building in Chongqing as an example, adopting FDS and the simulation of transient evacuation and pedestrian movements to simulate the spread of smoke and evacuation in a general fire scenario and offered several suggestions for fire safety. Chen et al. [25] proposed an event-driven agent-based modeling approach to quantitatively evaluate elevator-assisted evacuation processes. Yu-ting and Zhou [26] discussed the fire safety status of the building after the 2015 fire accident in Dubai and mentioned the importance of fire protection standards and firefighting equipment. Xu et al. [27] conducted a hot smoke test in the 60 m high atrium of the Shanghai Tower and studied in detail the movement laws and smoke characteristics of fire smoke.

For example, firefighting, smoke control, and personnel evacuation in super high-rise buildings are still beset by certain technical challenges [28-31]. Therefore, using scientific approaches to simulate fire scenarios to understand common modes and characteristics of fire spread is valuable for fire prevention and disaster reduction in super high-rise buildings [32, 33].

This study selected an actual super high-rise building to set up specific fire scenarios, establish a FDS fire model, and analyze the direction and type of spread for a fire in different fire scenarios.

2. Fire Scenario Settings of the Super High-Rise Building

2.1. Building Overview. Basically, the combustion characteristics of high-rise and super high-rise fires are the same; with that the potential spreads many ways, the speed is fast, the fire control is difficult, and the chimney effect is easy to form. The reliability of super high-rise fire facilities is low, the external rescue is difficult, and the environmental conditions are greatly affected. In the existing simulations, the influence of environmental factors on the combustion process of super high-rise buildings is less considered. For example, the boundary conditions such as air velocity and grid setting do not fully consider the characteristics of actual buildings, and there are few fire researches on super high-rise buildings. The research object of this study was the Saigao office, located in Shaanxi Province, China. The building has an approximate height of 150 m, with a total floor area of 85,532 [m.sup.2], a building area of 78,836 [m.sup.2] for 35 stories above ground level, and a building area of 6,696 [m.sup.2] for 3 stories located underground. The building consists of a steel-reinforced concrete frame reinforcing a concrete core-tube structure. The building functions are listed in Table 1.

2.2. Parameter Setting for Fire Scenarios. In the fire settings, the factors determining the degree and speed of fire development were mainly the heat release of the combustion material, fire growth factors, and the ambient temperature affecting the height of the neutral surface of the building. Moreover, this study combined the places for critical fire prevention to establish the fire parameters.

2.3. Heat Release. According to Shanghai's "Technical specification for building smoke control DGJ 08-88-2006", the thermal temperature released in each place varies depending on whether a sprinkler system is set up or not, as indicated in Table 2.

2.4. Fire Growth Factors. Rate of fire growth is a crucial indicator for measuring the risk of fire and is related to the storage of combustibles, combustion characteristics, spatial characteristics, the presence of water sprinkler systems, and ventilation devices. The relationship between fire heat release rate and duration can be expressed by

[Q.sub.f] = [alpha][(t - [t.sub.0]).sup.2], (1)

where [Q.sub.f] is the fire heat release rate in kW, [alpha] is the fire growth factor in kW/[s.sup.2], t is the fire burning time in s, and [t.sub.0] is the smoldering time of the fire in s.

Because of the small effect of smoldering on the spread of fire, smoldering time [t.sub.0] is usually ignored. Accordingly, equation (1) can be simplified as follows:

[Q.sub.f] = [alpha][t.sup.2]. (2)

Fire growth factors for different fire types are provided in Table 3. The primary functions of the super high-rise building used in this study are business and office-related activities, which feature a dense distribution of internal combustible material. Therefore, the typical fire type in such a building can be defined as a fast fire type with a fire growth factor [alpha] of 0.04689.

2.5. Ambient Temperature. In China, the State Council has promoted a campaign that restricts the temperature of air conditioning in public buildings, with the exception of those in certain industries; the temperature can be neither lower than 26[degrees]C in the summer nor higher than 20[degrees]C in the winter. Thus, the ambient temperature used in this study was set at 23[degrees]C.

2.6. Fire Scenario Setting. According to the distribution of the building functional area and the process of smoke spread in different spaces, six fire places were deliberately selected and set up for simulation studies, as detailed in Table 4.

2.7. Fire Hazard Criteria. Considering that the study of fire hazard is usually to ensure the safe evacuation of personnel, it is usually taken in conjunction with the environmental limit which the human body can withstand [34, 35]. Generally, it is considered from three aspects: the smoke layer height, the clear layer temperature, and the visibility, from a position 2.0 m above the ground.

(1) In this paper, the respirable air temperature not higher than 60[degrees]C is determined as the safe temperature.

(2) The visibility in a large-space fire field should be no less than 10 m, and the visibility in a small space should be no less than 5 m.

(3) It is generally considered that the tolerance value of the human body is not higher than 500 ppm when the smoke drops to a dangerous height.

2.8. Building Modeling Setting. From the perspective of personnel safety, in the construction fire, the harm of smoke is greater than the casual hazard of the fire. According to statistics, 80% of the deaths in such fire are caused by smoke. The building modeling process does not consider the damage effect of fire on the internal separation structure of the building but the spread process of the smoke. Set the door connecting the aisle in the room and divide the internal room into a noncombustible wall. Generally, the indoor window is closed. The fire cannot affect the automatic opening of the window, so it is considered to be closed, and at the same time, all the walls are incombustible walls.

3. Simulation Analysis of Smoke in a Super High-Rise Building

According to the setting of the fire scenario presented in Table 4, typical scenarios were selected for use in the analysis of the simulation results. The building structure model in the FDS is displayed in Figure 1.

Whether the fire develops in accordance with the heat release rate of the fire depends on the ratio ([D.sup.*]/[[delta].sup.*]) of the feature size of the fire source to the cell size of the grid where the source is located:

[D.sup.*] = [([Q.sub.f]/[[rho].sub.[infinity]][c.sub.p][T.sub.[infinity]][square root of g]).sup.2/5], (3)

where [D.sup.*] is the feature size of the fire, [[rho].sub.[infinity]] is the gas density at ambient temperature in kg/[m.sup.3], [c.sub.p] is specific heat at constant pressure of the gas in kJ/(kg * K), [T.sub.[infinity]] is ambient temperature in K, and 9 is gravitational acceleration in m/[s.sup.2].

Considering the increase in the heat release rate of the fire source and performance of the computer, the FDS User Manual suggests that the [D.sup.*]/[[delta].sup.*] value is most reasonable within the range of 4 to 16. Thus, [D.sup.*]/[[delta].sup.*] was calculated according to the cell size of the grid where the fire source was located ([[delta].sup.*] = 0.2 m), as detailed in Table 5.

As evident in Table 5, we demonstrated that the grid size was reasonable and that the established fire model was accurate and credible. Furthermore, by employing the adaptive test, we discovered that, to a certain extent, the results did not change significantly (approximately 0.1%) when the number of meshes increased, which further illustrated the reliability of the established fire model.

3.1. Fire Conditions of a Single Room in Different States. The thresholds for fire hazard for the three functional rooms are listed in Table 6. The black areas in Figures 2-4 denote the range in which the room reached the critical threshold. The larger the value, the greater the visibility and the lower the risk. Table 6 specifies the critical time required for fire to become a hazard in three scenarios: Catering area B > shop area A > office area C.

The analytical results revealed that the critical time required for fire to become a hazard in the shop area did not vary significantly under various failure conditions for the automatic sprinkler system and smoke extraction system. Smoke in all scenarios gathered from the corner. In fire scenarios in which the automatic sprinkler system or smoke extraction system experienced a single failure, critical time required for fire to become a hazard was similar, with a difference [less than or equal to]5s. The critical time of fire hazard was approximately 200 s in all the aforementioned fire scenarios, but the maximum straight-line distance from any point in the room to the evacuation gate was 20 m for high-rise buildings with first-rate and second-rate fire-resistance. Therefore, this length of time is sufficient to ensure that people can escape from a single room.

3.2. Fire Conditions of Different Functional Places in the Same State. Scenarios A10, B10, and C10 were selected for comparative analysis in which the fire type was a fire controlled by a sprinkler system.

As can be clearly seen from Figures 5 and 6, the CO mass fraction did not reach the critical value at 600 s, and the entire space of the three different functional sites all reached a dangerous temperature. Therefore, the criterion of CO mass fraction did not play a role in the parameters affecting evacuation time and reduced the critical time required for temperature to become a hazard. At 1800 s, the temperature at the fire source decreased and the fire became smaller, which was related to the fact that the fire scenario selected featured a dysfunctional smoke extraction system and an effective sprinkler system. The temperature and CO mass fraction growth in scenario C10 were faster than those of scenarios A10 and B10. Thus, fire prevention in the office area should be taken seriously because the office areas comprised the majority of super high-rise buildings.

3.3. Fire Spread. As the fire occurred in a room in the building, smoke, heat radiation, and temperature promptly augmented the space, and the smoke spread along various gaps to other areas. During the process of evacuating personnel to the staircase, the accommodation space in the front chamber was limited. Therefore, staff would require a certain space in the aisle.

Scenario D10 was selected for simulation and analysis of the situation in which the automatic sprinkler system was effective but the smoke extraction system was faulty. In the simulation, changes in fire temperature were evaluated by setting thermocouple points, as displayed in Figure 7. The thermocouples were arranged in the key area of the F14 room, and its connected staircase at a height of 2 m from the roof to detect temperature changes, as displayed in Figure 8.

F14-1 and F14-3 were the thermocouples in the front chamber of the staircase, and F14-2 and F14-4 were the thermocouples in the staircase. F14-aisle 1, F14-aisle 2, F14-aisle 3, and F14-aisle 4 were the thermocouples in the aisle, and F14-aisle 1 was located 5 m beneath the fire point. The distance between two adjacent thermocouples was 5 m, and because the area was relatively symmetrical, thermocouples were arranged on the left side only. F14-door 1 and F14-door 2 were thermocouples at the door of the room, and the distance from the fire source was 17 and 4 m, respectively. F14-room 1, F14-room 2, and F14-room 3 were thermocouples in the room with distances from the red fire source of 5, 10, and 15 m, respectively.

According to the simulation results, as displayed in Figure 9, the CO mass fraction at 1800 s was at most 3 x [10.sup.-4], which did not exceed the maximum tolerance limit of 5 x [10.sup.-4]. Therefore, CO does not generally affect the safety evacuation.

In practice, visibility is a parameter closely related to smoke, as indicated in Figure 10, where black is the critical line of visibility for people, with a value of 5 m. The rate of smoke spreading and lowering was exceptionally high, with an adjacent open area being affected almost every 60 s. At 101 s, the top of the room began to gather smoke. At 162 s, the smoke had filled the entire room and spread to the top of the outside aisle, whereas visibility in the room exceeded the visual distance of a person. At 221 s, smoke continued to sink lower in the aisle, spread to the front of the stairs, and then began to gather at the top of the front chamber. At 292 s, the smoke spread to the staircase and gathered at the top of the staircase, further threatening safety evacuation of personnel. At 508 s, the smoke filled the entire space, and all areas were invisible, which seriously affected the normal actions of the personnel.

According to the temperature detected by thermocouples, as presented in Figure 11, the temperature inside the room was higher than 60[degrees]C, which exceeded the temperature range bearable to the human body. In the room, the temperature was higher at greater distances from the fire source; after 200 s, the temperature detection point tended to remain stable, with [T.sub.room1] > [T.sub.room2] > [T.sub.room3], [T.sub.door2] > [T.sub.door1] > 60[degrees]C. [T.sub.door1] had the lowest average temperature, which remained stable at 65[degrees]C after 200 s. The distance between door 2 and the fire source was 4 m, but heat was exchanged inside and outside the room and reduced the temperature of door 2 because the door was open and the temperature outside the room was lower than the temperature inside the room. Accordingly, [T.sub.room2] > [T.sub.door2], as presented in Figure 7.

Compared with the temperature inside the room, the temperature outside the room (Figure 12) was generally much lower. The maximum temperature did not exceed 52[degrees]C, which was lower than the 60[degrees]C threshold for tolerability by the human body. After 200 s, the temperature remained steady, with [T.sub.aisle] > [T.sub.stairroom] > [T.sub.fore-room] > 28 [degrees]C and [T.sub.aisle4] > [T.sub.aisle3] > [T.sub.aisle2] > [T.sub.aisle1] > 42 [degrees]C.

A comparison of the three fire criteria (CO mass fraction, visibility, and temperature) revealed that the dominant factor with the most significant effect on safety evacuation time was visibility. Relevant studies have demonstrated that smoke is the primary cause of death during fires [36-38]. Therefore, the first step during evacuation is to leave the fire room quickly and avoid remaining in a corner, which can effectively prevent harm caused by smoke.

Fire scenario E is displayed in Figure 13; the grid is the fire simulation area in which the temperature condition of the upper floor was the same as that of the lower floor when the fire occurred. The thermocouple arrangement in F14 was the same as in fire scenario D, and the measuring points were arranged in the walkway on the 15th floor, the staircase, and its front chamber, the same as in F14.

Fire scenario F is displayed in Figure 14, and the thermocouple arrangement in F14 was the same as scenario D. The thermocouples of F15 and F16 were arranged in the walkway in the same manner as in F14, as were the staircase and its front chamber.

According to the simulation results of fire scenarios E and F detected by the thermocouples, the temperature of the staircase and its front chamber in the two scenarios were always lower than the threshold temperature of 60[degrees]C for tolerance by the human body. From the perspective of temperature, when a fire occurred in scenarios E and F, the staircase and its front chamber were relatively safer areas that could be used to temporarily protect personnel.

4. Conclusions

To acquire a comprehensive understanding of the laws of fire spread in super high-rise buildings, a FDS simulation was performed on the Saigao office in Shaanxi Province, China. The conclusions of the simulation are as follows:

(1) The critical time required for the same type of fire to become a hazard in a shop, a restaurant, or an office was slightly more than 200 s, with the critical time being shortest in the office area, indicating that protecting and monitoring the office area for fire safety should be a priority.

(2) Compared with temperature and CO mass fraction, visibility was closely related to smoke because it had the most significant effect on the critical time required for fire to become a hazard. The critical time required for fire to become a hazard determined in terms of visibility was significantly shorter than temperature or CO mass fraction.

(3) The speed at which smoke spread and lowered was extremely fast, and smoke always began to accumulate and spread from the corner and the ceiling. From the perspective of visibility, smoke would affect an adjacent open area in almost every 60 s.

Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

Authors' Contributions

Xin Yi and Changkui Lei equally contributed to this work.


This work was supported by the National Nature Science Foundation Funded Project of China (grant no. 5180-4247). The authors are grateful to the guidance of various experts during paper writing and numerical simulations.


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Xin Yi, (1,2) Changkui Lei [ID], (1) Jun Deng, (1,2) Li Ma, (1,2) Jing Fan, (1) Yuanyuan Liu, (1) Lei Bai, (1,2) and Chi-Min Shu (3)

(1) School of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an, China

(2) Shaanxi Key Laboratory of Prevention and Control of Coal Fire, Xi'an, China

(3) Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology, 123,

University Rd., Sec. 3, Douliou, Yunlin, Taiwan

Correspondence should be addressed to Changkui Lei;

Received 16 February 2019; Revised 16 April 2019; Accepted 28 April 2019; Published 14 May 2019

Academic Editor: Behzad Esmaeili

Caption: Figure 1: The super high-rise building structure model used in FDS.

Caption: Figure 2: Critical time of fire hazard for scenario A. (a) A00, (b) A01, (c) A10, and (d) A11.

Caption: Figure 3: Critical time of fire hazard for scenario B. (a) B00, (b) B01, (c) B10, and (d) B11.

Caption: Figure 4: Critical time of fire hazard for scenario C. (a) C00, (b) C01, (c) C10, and (d) C11.

Caption: Figure 5: Slices of the CO mass fraction in different scenarios. (a) A10, (b) B10, and (c) C10.

Caption: Figure 6: Slices of the temperature in different scenarios. (a) A10, (b) B10, and (c) C10.

Caption: Figure 7: Temperature vs. time inside the room in fire scenario D10.

Caption: Figure 8: Thermocouple arrangements of F14. (a) 2D thermocouple arrangements; (b) 3D thermocouple arrangements.

Caption: Figure 9: Slice of the CO mass fraction at 1800 s.

Caption: Figure 10: Visibility slice of fire scenario D10.

Caption: Figure 11: Temperature slice of fire scenario D10.

Caption: Figure 12: Temperature vs. time outside the room of fire scenario D10.

Caption: Figure 13: Structure of fire scenario E.

Caption: Figure 14: Structure of fire scenario F.
Table 1: Summary of the super high-rise building functions.

Floor                               Function

Underground 2nd and        Garage and equipment rooms
3rd floors
Underground 1st floor    Equipment and commercial space
1st floor               Office hall and commercial space
2nd to 6th floors               Commercial space
7th and 21st floors               Refuge story
8th to 20th floors                 Low office
22nd to 35th floors                High office

Table 2: Heat release for various sprinkler systems.

Places                                        Heat release Q (MW)

Mall with a sprinkler system                          5.0
Office and room with a sprinkler system               1.5
Public place with a sprinkler system                  2.5
Office and room without a sprinkler system            6.0
Public place without a sprinkler system               8.0

Table 3: Fire growth factors for various fires.

Fire type                 Typical combustible       Fire growth
                               material               factor

Slow-spreading fire       Hardwood furniture          0.00293
Medium-spreading       Cotton and polyester mats      0.01172
Fast-spreading fire     Wooden shelves and foam       0.04689
Ultra-fast-spreading    Pool fire, fast-burning
fire                     decorative furniture,        0.18750
                          and light curtains

Table 4: Fire scenario design for this study.

Fire location       Fire          Fire growth        Sprinkler
                  scenario   factor (kW/[s.sup.2])    system

F1 shop A           A00             0.04689           Invalid
                    A01             0.04689           Invalid
                    A10             0.04689            Valid
                    A11             0.04689            Valid

F4 restaurant B     B00             0.04689           Invalid
                    B01             0.04689           Invalid
                    B10             0.04689            Valid
                    B11             0.04689            Valid

F15 an office       C00             0.04689           Invalid
area C              C01             0.04689           Invalid
                    C10             0.04689            Valid
                    C11             0.04689            Valid

F14 an office       D00             0.04689           Invalid
area and            D01             0.04689           Invalid
staircase D         D10             0.04689            Valid
                    D11             0.04689            Valid

F14-15 an           E00             0.04689           Invalid
office area and     E01             0.04689           Invalid
staircase E         E10             0.04689            Valid
                    E11             0.04689            Valid

F14-15-16 an        F00             0.04689           Invalid
office area and     F01             0.04689           Invalid
staircase F         F10             0.04689            Valid
                    F11             0.04689            Valid

Fire location       Fire           Smoke
                  scenario   extraction system

F1 shop A           A00           Invalid
                    A01            Valid
                    A10           Invalid
                    A11            Valid

F4 restaurant B     B00           Invalid
                    B01            Valid
                    B10           Invalid
                    B11            Valid

F15 an office       C00           Invalid
area C              C01            Valid
                    C10           Invalid
                    C11            Valid

F14 an office       D00           Invalid
area and            D01            Valid
staircase D         D10           Invalid
                    D11            Valid

F14-15 an           E00           Invalid
office area and     E01            Valid
staircase E         E10           Invalid
                    E11            Valid

F14-15-16 an        F00           Invalid
office area and     F01            Valid
staircase F         F10           Invalid
                    F11            Valid

Fire location       Fire           Maximum heat
                  scenario   release rate of fire (MW)

F1 shop A           A00                 8.0
                    A01                 8.0
                    A10                 5.0
                    A11                 5.0

F4 restaurant B     B00                 8.0
                    B01                 8.0
                    B10                 2.5
                    B11                 2.5

F15 an office       C00                 6.0
area C              C01                 6.0
                    C10                 1.5
                    C11                 1.5

F14 an office       D00                 6.0
area and            D01                 6.0
staircase D         D10                 1.5
                    D11                 1.5

F14-15 an           E00                 6.0
office area and     E01                 6.0
staircase E         E10                 1.5
                    E11                 1.5

F14-15-16 an        F00                 6.0
office area and     F01                 6.0
staircase F         F10                 1.5
                    F11                 1.5

Table 5: Q vs. [D.sup.*] and [D.sup.*]/[[delta].sup.*] values.

Q (kW)                         8      6      5     2.5    1.5

[D.sup.*]                    2.18    1.95   1.81   1.37   1.12
[D.sup.*]/[[delta].sup.*]    10.90   9.75   9.05   6.85   5.60

Table 6: Critical time required for fire to become a hazard for the
three functional rooms.

Fire location          Fire scenario   Critical time required for
                                       fire to become a hazard (s)

F1 shop area A              A00                    184
                            A01                    196
                            A10                    191
                            A11                    212

F4 catering area B          B00                    190
                            B01                    196
                            B10                    194
                            B11                    214

F15 an office area C        C00                    119
                            C01                    121
                            C10                    124
                            C11                    133
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Article Details
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Title Annotation:Research Article
Author:Yi, Xin; Lei, Changkui; Deng, Jun; Ma, Li; Fan, Jing; Liu, Yuanyuan; Bai, Lei; Shu, Chi-Min
Publication:Advances in Civil Engineering
Geographic Code:9CHIN
Date:May 31, 2019
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