Zheng Fang

Zheng Fang
Wuhan University | WHU ·  College of Civil Engineering

About

76
Publications
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Publications

Publications (76)
Article
The fierce positive pressure problem at the bottom of a building drainage pipe system can cause building discharge backflow or indoor environmental pollution. Full-scale discharge experiments on the vent pipe bottom position were conducted in a 60-m-high experimental tower. The vent pipe bottom connected to the drainage stack and to the horizontal...
Article
Full-text available
Most old urban areas of China have a dense population, severely indurated underlying surface, and highly developed underground space. Those increase the waterlogging risk and obstruct the stormwater management in old urban areas. To propose an appropriate engineering strategy for low impact development (LID) transformation in an urban area, a simul...
Article
Full-text available
This paper presents a comprehensive set of numerical simulations for the characterization of a water mist spray emerging from a nozzle positioned at 2.2 m from floor level and operating at a pressure of 1.0 MPa. The droplet volume-median diameter is about 90 μm and the spray half-angle is around 42°. The spray shape is visualized using a laser shee...
Article
Experimental investigation on the fire plume mass flow rate distribution in the upstream and downstream direction of fire is performed. Series of tests were conducted in a reduced-scale tunnel model with longitudinal ventilation. The ceiling temperatures along the tunnel were measured under different heat release rate of the fire source and longitu...
Article
The individual and combined effect of a water mist system (WMS) and longitudinal ventilation (LV) on the fire HRR, smoke temperature and back-layering (BL) degree were explored in a 3 m (width)×2.2 m(height)×30 m (length) tunnel model. A series of 39 tests has been conducted in 6 configurations, varying the velocity, water volume flow rate and nozz...
Article
Computational Fluid Dynamics (CFD) simulation results, obtained with FDS 6.0.1, are presented of reduced-scale tunnel fire tests with longitudinal mechanical ventilation and an activated water spray system. This is a sub-set of a more extensive data set, in the context of blocking fire-induced smoke tunnel tests conducted previously. As discussed i...
Article
A 1/3 scaled tunnel model was built to explore the effect of fire source elevation on fire and smoke behavior, and especially the critical velocity, in a tunnel with longitudinal ventilation. An experimental campaign has been carried out with a series of tests in 9 configurations, varying the fire size, ventilation velocity and fire elevation. Resu...
Article
Gravity-driven membrane (GDM) filtration system is a promising process for decentralized drinking water treatment. During the operation, membrane relaxation and shear stress could be simply achieved by intermittent filtration and water disturbance (created by occasionally shaking membrane model or stirring water in membrane tank), respectively. To...
Article
A new advanced oxidation process, FeS-activated sulfite system, was firstly established to degrade β-blockers in water at near neutral pH. By choosing propranolol (PRO) as a model compound, the experimental conditions including FeS and sulfite doses, initial pH, dissolved oxygen, and co-existed components were investigated. Up to 95% of PRO was eli...
Article
Full-text available
In high-rise and ultra-high-rise residential buildings, the drainage systems usually adopt the S-shaped offset pipe joint to avoid collisions of pipelines with beams and columns. However, the flow direction changes at the offset point would significantly affect the drainage capacity of the systems. To better understand the influence of pipe offset...
Article
A 1/3-scale model tunnel installed with a water mist segment system is built to study the effectiveness of a water mist segment system in blocking fire-induced smoke and heat. Interaction of water with fire is avoided. A series of 14 tests are performed for a wide range of settings, including variable fire loads, nozzle quantities, water pressures...
Article
UV-activated persulfate (PS) systems have been widely employed to remove organic contaminants. However, the heavy use of persulfate may lead to secondary pollution. Here we proposed a novel UV/PS/sulfite oxidation process, in which sulfite would not only promote but also partially replace persulfate to produce sulfate radicals. We tested this syste...
Article
Experiments on different vent pipe diameters (nominal diameters of 100, 75 and 50 mm; DN100, DN75 and DN50, respectively) in a full-scale circuit vent building drainage system were conducted in a 60 -m high structure, and the wastewater discharge capacities as a function of vent pipe diameter were measured. Critical pipe pressures, water seal losse...
Article
Computational Fluid Dynamics (CFD) simulation results, obtained with FDS 6.0.1 (McGrattan et al., 2013), are presented of reduced-scale tunnel fire tests. In (Sun et al., 2016), an extensive data set has been discussed in terms of temperature measurements in a reduced-scale tunnel, involving longitudinal ventilation and a variety of water supply th...
Article
This article presents computational fluid dynamics results of the impact of a water spray on the fire smoke layer inside a hood. The models and the settings of parameters are discussed. Three experiments are performed by means of computational fluid dynamics simulations, and the comparisons show good agreement between measured data and predicted re...
Article
Full-text available
Computational Fluid Dynamics (CFD) is a useful tool in tunnel fire safety, providing reliable data as a supplement and extension of experiments. In this work, simulations of reduced-scale tunnel fire experiments, concerning in a concrete tunnel model with a scale of 1/3, are presented. It mainly focuses on evaluating the quality of the CFD results....
Article
Full-text available
Based on the cultural relic buildings fire characteristics and fire safety management parameters, put forward five aspects of ZigBee perception factors of the cultural relic buildings, including the fire hazards, evacuation characteristics, fire safety facilities, firefighting and rescue condition and the fire safety management. Setting up cultural...
Article
Based on the Froude similarity law, a small-scale tunnel model (1/14) was built based in this study to investigate critical velocities of tunnels. Critical velocity is the minimum air velocity required to resist the spread of smoke from a fire upstream in a tunnel. A set of experiments was conducted to investigate the critical velocities under diff...
Article
Full-text available
With the higher ultra-tall towers development, there are more difficult designs in evacuation. The collaborative evacuation among stairs and elevators was put forward based on analysis of the advantages and disadvantages of elevators for evacuation of ultra-tall tower. Then the principle of collaborative evacuation strategy and design key points we...
Article
Full-text available
Fire poses a great risk to people in a tunnel if it is not controlled effectively, so how to detect and locate a fire is an important issue of tunnel fire protection. In this study, numerical simulation has been carried out to study the impact of longitudinal ventilation on fire detection system of an urban tunnel using FDS 5.5. It can be concluded...
Article
Full-text available
More and more comprehensive pipeline corridors are built in the urban cities to avoid the inconvenience effects of traffic jams to people's daily lives that pipelines laying caused and raise the quantity of pipeline management. While, the fire risk degree of comprehensive pipeline corridor is pretty high. This article analyses the fire risk type an...
Article
Full-text available
Smoke poses a great risk to people in a tunnel fire if not controlled effectively, so how to extract smoke out of tunnel is an important issue of tunnel fire protection. In this study, numerical simulation has been carried out to study the influence of smoke damper configuration on point extraction ventilation system of an urban tunnel using FDS 5....
Conference Paper
Previous tunnel fire disasters have shown that serious damage could be caused. The first goal of tunnel fire safety is to guarantee the life safe of tunnel users. It is therefore important to pay much attention to the evacuation system of tunnels. The main purpose of this paper is to provide the approach and reasonable value of walk speed for evacu...
Article
A water system, consisting of several water mist nozzles, has been installed in a reduced-scale tunnel. Its effectiveness in blocking fire-induced smoke and heat is tested, with and without longitudinal ventilation. A total of 14 fire tests have been carried out, with 250 ml methanol in an iron tray (25 cm × 20 cm) as fuel. Temperatures have been m...
Article
Based on the basic physic laws and the idea of two-zone model of fire, a mathematical model of the downward smoke displacement in fire under the effect of water droplets is constructed by analyzing the interaction between a single droplet and hot air flow and by investigating the impact of water droplets on the smoke layer of fire. Then, the constr...
Article
This essay studies the breakage of glass curtain due to the fire in a tower building with a CFD (computation fluid dynamics) based simulation package (FDS). The heat release rate of fire is 6MW which determined by the function of the tower. The results shows temperature in vertical direction change a lot. Since the tress generated by temperature di...
Article
According to the fire characteristics of building fire, the paper employed AHP (analytic hierarchy process) to establish building fire risk assessment system, including categories of factories, hotels, malls, schools and public amenities, based on the using properties of buildings. Meanwhile, the questionnaires and the cluster analysis were propose...
Article
Full-text available
Based on the characters of wholesale and retail market, it owns larger amount of inventory, bigger fire load, larger crowds and bigger daily trading volume of the wholesale market, and lager size of the mall. Through investing the occupant density of Wuhan Financing Brand Square which used normal population mean and variance of interval estimation...
Conference Paper
The simple automatic sprinkler system, with the characteristics of small investment and simple construction, is widely used in various small existing buildings that have high risk of fire. In this study, experiments were conducted to analyze the feasibility of using plastic pipe in the simple automatic sprinkler system. The results of the study con...
Article
A stand-alone analytical model for downward smoke layer displacement caused by a water spray is developed. The model can be implemented into two-zone model calculations. Smoke flow into and out of the water spray envelope is incorporated, as well as a model for the heat exchange between the smoke and the water droplets. The model input quantities a...
Article
Full-text available
Due to the limited space, the lateral pattern to control tunnel fire smoke spread is usually used by double-decked tunnel. There is a smoke exhaust dust in one side, and an exit passageway in the other. FDS is adopted in this article to discuss the lateral ventilation changes caused by different smoke vent area, number, and spacing. According to th...
Article
Full-text available
An Urban Traffic Link Tunnel (UTLT) is a novel type of underground transportation system consisting of a main tunnel in a loop shape and several linked tunnels. It has a higher level of fire risk compared to other common road tunnels. In this study, numerical and experimental study has been conducted to investigate the smoke control of Wuhan Centra...
Article
Full-text available
Taking a city underwater tunnel as an example, temperature variation and smoke movement under longitudinal ventilation smoke control system and central smoke exhaust system were measured by full-scale experiment. Different longitudinal airflow speeds under central exhaust system were discussed. Based on the results, a fire caused by an accidental v...
Article
An analytical model is developed from basic principles to quantify the downward smoke displacement as caused by a water spray from e.g., a sprinkler head. The underlying assumptions are identified and the global balance is described between downward drag force, potentially downward buoyancy due to a cooling effect within the water spray envelope in...
Article
A set of experiments is presented on the effect of a water spray on a fire-induced smoke layer. The downward smoke layer displacement as a result of the interaction with the water droplets is quantified for a wide range of settings, including variable fire conditions, smoke layer temperature, smoke layer thickness and water spray operation pressure...
Article
In order to further understand the features of evacuees' psychology, behavior, and decision-making which are in accord with Chinese characteristics during the fire evacuation of residential buildings, post-fire surveys were carried out with the assistance of local fire professionals in Wuhan during 2010 and 2012. The condition, behavior, and decisi...
Article
A double-chamber microbial fuel cell (MFC) was used to dispose Dioscorea Zingiberensis wastewater and retrieve electrical energy. Both electrical performance and contaminant degradation characteristics were investigated. The potential of the MFC achieved 0.50-0.55 V over a 1000 ohm resistance, and the Coulombic efficiency was 7.01% or so. The maxim...
Article
Full-text available
Cross passageways have been commonly applied in the evacuation system of tunnels, and the width and spacing of the cross passageways decide the evacuation capacity of the tunnel. In design, increasing the width of the cross passageways and reducing their spacing can improve the evacuation ability of tunnels. However, it will certainly increase the...
Article
Full-text available
Safe evacuation criterion was first analyzed for fire safety assessment of city underwater tunnel. Then a worst fire scenario of a real underwater tunnel was set up, and simulations on fire smoke spread and people evacuation were carried out based on this scenario. The available safe egress time (ASET) was derived from the fire simulation, while th...
Article
Full-text available
As more and more underground car parks are built in the city, it is important to design an good fire protection system. Nowadays, many car parks use the impulse ventilation system to control smoke when fire takes place. In order to study the smoke control of impulses ventilation during car park fires when sprinkler system is installed, FDS is used...
Article
The characteristics of city underwater tunnels are unfavorable for evacuation. Reasonable design and evaluation of the evacuation capacity are the premise of the safety of tunnel users. An observation experiment was carried out by using the inner vertically evacuation with slide as research object. The velocity of getting off vehicle, the running s...
Article
1/20 scale model test and full scale field test were carried out to study the critical velocity for fire ventilation in horizontal tunnels. Combined with the test results, small-scale test results by Jae and full-scale test and simulation by Hu, a semi-empirical model was developed to predict the longitudinal critical velocity for tunnel fire venti...
Article
Safe evacuation is the most fundamental requirement of fire safety measures in buildings. Many computer based evacuation models have been developed to quantify and model human movement in the buildings. Two methods are usually used to represent the building enclosure in these models: fine and coarse networks. This paper presents a fine network mode...
Article
Safe evacuation is the most fundamental requirement of fire safety measures in buildings. Traditional building evacuation design is governed by prescriptive building codes which neither have a clear statement of design objectives, nor proper consideration of the interactions between different components of the evacuation system. With rapid developm...
Article
A survey of crowd movement was recently performed at the main railway station in Wuhan City, China during the traditional Chinese spring festival in 2003. The crowd was formed by passengers in the exit tunnel of the station after getting off a train. The observed maximum density of the crowd and maximum speed of the fastest individual were 2.8 pers...
Article
This paper reports observations of passenger flow in the Wuchang railway station in Wuhan, China during the Chinese Traditional Spring Festival in 2006. The data collected are used to verify a crowd dynamics model previously developed. The crowd dynamics model is based on simulating the global movement of each individual under the influence of the...
Article
Coherent Target Analysis (CTA) method derived for the (Interferometric SAR) InSAR data processing has developed as one of the critical techniques in the field of surveying subtle land deformation. This paper discusses the principles and characteristics of CTA procedure, which can remove the errors caused by temporal and spatial decorrelation and at...
Article
Full-text available
This paper discusses the validation of the data sets of Permanent Scatterer (PS) technique. The test area is chosen in the main town of Shanghai. Using 26 scenes of ERS-1/2 images within 1993 to 2000, more than 22,000 Permanent Scatterers (PSs), data sets of PS technique, are derived. Because of the linear model of them in time series, the main poi...
Article
Human being is at risk from many natural and man-made hazards, such as the recent South Asian tsunami strike and the New York's "9·11" incident in 2001. Evacuation of people from the hazardous region is a way to reduce the ill effects of disasters and evacuation planning is a critical component in emergency management. This paper discusses on devel...
Article
A simulation approach for ranking of fire safety attributes of buildings has been developed on the basis of Analytic Hierarchy Process (AHP) method. The proposed approach can assist fire safety professionals to evaluate the relative weighting of fire safety attributes of a building in the form of a hierarchy of references through a series of pairwi...
Article
Buildings erected in ancient China were often of wood and thatch and were particularly flammable. The ancient world developed a number of ways to minimize the damage caused by fire. An analysis of the architecture of ancient construction and urban planning, has revealed over a hundred fire prevention features. These items could be categorized into...
Article
The United Kingdom, New Zealand, Australia, Sweden, Hong Kong and many other developed countries are moving away from the prescriptive-based building/fire codes and towards performance-based approaches. Designers adopt a fire safety engineering approach to provide rational design on the basis of performance criteria. One of the major issues in fire...
Article
The crowd flow pattern under emergency situations has been studied on the basis of dynamic movement principles. It has been demonstrated that the surrounding crowd density will influence the speed of an individual. The derivation of the movement equations of people with respect to the impacts at front, back and lateral directions has been given, an...
Article
The background, contents and structure of performance-based fire engineering approach are explained, and its advantage and disadvantage are discussed after reviewing the development of the performance-based fire engineering all over the world. The paper describs the impact of this approach to the fire protection system in China. Finally, referring...
Article
This article presents the development of an automatic process in transforming computer-drawn architectural plans into a building fire evacuation simulator—spatial-grid evacuation model (SGEM). The SGEM has been developed to model the dynamic positions of each occupant of a building at every time point under an evacuation process. The presented proc...
Data
Full-text available
Refuge floorspace is implemented as a temporary place for high-rise-building evacuees to take a short rest before further evacuating in the case of a fire. It is specified as a requirement in the Fire Code of Hong Kong to provide designated refuge floors for high-rise buildings. To meet its desired function, a refuge floor must be a safe place for...
Article
Full-text available
Refuge floorspace is implemented as a temporary place for high-rise-building evacuees to take a short rest before further evacuating in the case of a fire. It is specified as a requirement in the Fire Code of Hong Kong to provide designated refuge floors for high-rise buildings. To meet its desired function, a refuge floor must be a safe place for...
Article
Traditionally, the spatial design of a building is influenced by the prescriptive fire safety codes. As buildings develop and become more complex and new materials are used, the prescriptive fire safety rules may not provide an efficient solution to the new building design. A system approach to the design of fire safety in buildings on the basis of...
Article
The spatial design of a building affects the movement of occupants. In complex buildings with a large population, such as places of assembly, the movement of people towards the exits under emergency situations is a major concern. Ideally, people should leave the building smoothly under emergency situations. Traditionally the layout design is govern...
Article
Full-text available
This article presents a numerical study of external heat and smoke spread caused by compartment fires in multistory buildings. Usually, a building fire causes not only hazard to the occupants in that compartment, but also poses a possible threat to the occupants in other compartments, in particular to those located at upper stories. In this study,...
Article
Full-text available
Refuge floor is used as a temporary safe space for evacuees resided in high-rise building under emergency case, e.g., fire situation. The provision of refuge floor is a prescriptive requirement in the fire code of Hong Kong. Such a provision is desirable by regulators as it relates to simple rules and has administrative convenience. However, the sa...
Article
A modified coarse network model has been developed to simulate the evacuation patterns in high-rise buildings. The model can account for high-density situations as well as recording the process of an individual's locomotion pattern. The results of simulations show that all occupants in a high-rise building are unlikely to escape in a few minutes. P...
Article
Full-text available
Refuge ¯oor is specially designed in high-rise buildings for the purpose of supplying a temporarily safe place for evacuees under emergency situations. The provision of such designated refuge ¯oor is a prescriptive requirement in the ®re code of Hong Kong. Such a provision appears to be desirable by the regulators as it relates to simple rules and...
Data
Refuge floor is used as a temporary safe space for evacuees resided in high-rise building under emergency case, e.g., fire situation. The provision of refuge floor is a prescriptive requirement in the fire code of Hong Kong. Such a provision is desirable by regulators as it relates to simple rules and has administrative convenience. However, the sa...
Data
This article presents a numerical study of external heat and smoke spread caused by compartment res in multistory buildings. Usually, a building re causes not only hazard to the occupants in that compartment, but also poses a possible threat to the occupants in other compartments, in particular to those located at upper stories. In this study, thre...
Article
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This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the cont...
Article
Evacuation systems are designed as a means to protect people in emergency situations in buildings. The traditional design of an egress system in a building normally follows the prescriptive requirements stipulated in fire or building codes. The codes usually govern the capacity of exit routes, which are normally based on intuitive judgment. With th...