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Study on Fire Smoke Properties of Subway Station Passageway by Simulation Experiments

Zhu Wei,Lu Ping,Liao Guangxuan,Li Peide,Hong Yixiu

Strategic Study of CAE 2005, Volume 7, Issue 2,   Pages 91-96

Abstract: Temperature relative value is provided to analyze the law of smoke temperature along the station passagewayBased on images collected, the conditions needful for coming into being smoke layer and the applicabilityof zone model are discussed in the investigation of smoke properties in subway fire.Otherwise, it is also indicated from the results of smoke component measurements that CO concentration

Keywords： subway fire     scale model     smoke temperature     smoke configuration     CO concentration    

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Effects of green roof damping and configuration on structural seismic response

Frontiers of Structural and Civil Engineering   Pages 1133-1144 doi: 10.1007/s11709-023-0959-9

Abstract: Sustainable structures are critical for addressing global climate change. Hence, their structural resilience or ability to recover from natural events must be considered comprehensively. Green roofs are a widely used sustainable feature that improve the environment while providing excellent occupant amenity. To expand their usage, their inherent damping and layout sensitivity to seismic performance are investigated in this study. The soil of a green roof can serve as a damper to dissipate the energy generated by earthquakes or other dynamic events. Results of preliminary analysis show that a green roof soil can increase localized damping by 2.5% under both dry and saturated conditions. Based on these findings, nonlinear time-history analyses are conducted on a three-story building in SAP2000 to monitor the structural behavior with and without a green roof. The increased damping in the green roof soil is beneficial to the structural performance, i.e., it reduces the building displacement and acceleration by 10% and 12%, respectively. Additionally, certain configurations are more effective and beneficial to the structural response than others, which suggests the possibility of design optimization. Based on the findings of this study, new methods of modeling and considering green roofs in structural design are established.

Keywords： green infrastructure     green roof     structural resilience     seismic design    

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Effect of cutterhead configuration on tunnel face stability during shield machine maintenance outages

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 4,   Pages 522-532 doi: 10.1007/s11709-023-0930-9

Abstract: Owing to long-distance advancement or obstacles, shield tunneling machines are typically shut down for maintenance. Engineering safety during maintenance outages is determined by the stability of the tunnel face. Pressure maintenance openings are typically used under complicated hydrogeological conditions. The tunnel face is supported by a medium at the bottom of the excavation chamber and compressed air at the top. Owing to the high risk of face failure, the necessity of support pressure when cutterhead support is implemented and a method for determining the value of compressed air pressure using different support ratios must to be determined. In this study, a non-fully chamber supported rotational failure model considering cutterhead support is developed based on the upper-bound theorem of limit analysis. Numerical simulation is conducted to verify the accuracy of the proposed model. The results indicate that appropriately increasing the specific gravity of the supporting medium can reduce the risk of collapse. The required compressed air pressure increases significantly as the support ratio decreases. Disregarding the supporting effect of the cutterhead will result in a tunnel face with underestimated stability. To satisfy the requirement of chamber openings at atmospheric pressure, the stratum reinforcement strength and range at the shield end are provided based on different cutterhead aperture ratios.

Keywords： tunnel face stability     cutterhead configuration     aperture ratio     pressure gradient     support ratio    

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Optimizing the configuration of a clearwell by integrating pilot and full-scale tracer testing

LIU Wenjun, DU Zhipeng, JIN Junwei

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 3,   Pages 270-275 doi: 10.1007/s11783-007-0045-x

Abstract: confirmed that the installation of baffles within clearwells is an efficient way to optimize their configuration
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Tracing the impact of stack configuration on interface resistances in reverse electrodialysis by in situ

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 4, doi: 10.1007/s11783-021-1480-9

Abstract:

• RED performance and stack resistance were studied by EIS and LSV.

Keywords： Reverse electrodialysis     Electrochemical impedance spectroscopy     Concentration polarization     Spacer shadow effect    

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Study on Particle Size and Its Distribution Function of Standard Fire Smoke

Shu Xueming,Zheng Kui,Yuan Hongyong,Yao Bin

Strategic Study of CAE 2005, Volume 7, Issue 8,   Pages 51-55

Abstract:

Smoke is the important parameter of fire detection, and smoke particle size and its distribution mayaffect the sensitivity of smoke detectors directly.In this paper, the theory, configuration and measurement method of Scanning Mobility Particle Sizer (The particle size distribution function of smoke were studied by mathematic fitting methods, and theThe results may be benefit for the foundational research on fire smoke detection.

Keywords： smoke     particle     size     distribution function    

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Passive convergence-permeable reactive barrier (PC-PRB): An effective configuration to enhance hydraulic

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 12, doi: 10.1007/s11783-022-1591-y

Abstract:

● A novel PRB configuration based on passive convergent flow effect

Keywords： Passive convergence-permeable reactive barrier (PC-PRB)     Permeable reactive barrier configuration     Numerical    

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Efficient Configuration Space Construction and Optimization for Motion Planning Article

Jia Pan, Dinesh Manocha

Engineering 2015, Volume 1, Issue 1,   Pages 46-57 doi: 10.15302/J-ENG-2015009

Abstract:

The configuration space is a fundamental concept that is widely used in algorithmic robotics.In this paper, we survey some of our recent work on solving two important challenges related to configurationspaces: ① how to efficiently compute an approximate representation of high-dimensional configurationThese algorithms perform collision queries on many configuration samples., which quickly converges to the exact configuration space.

Keywords： configuration space     motion planning     GPU parallel algorithm    

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National Fire Protection Association, Quincy, MA, 1995Study on smoke filling combined with sprinklercooling and natural smoke exhaust

Li Sicheng,Chen Ying,Hu Longhua,Huo Ran and Yang Dong

Strategic Study of CAE 2010, Volume 12, Issue 9,   Pages 90-95

Abstract:

A mathematical model was developed for predicting smoke filling combinedwith sprinkler cooling and natural smoke exhaust.Experiments were carried out to validate the model, with experimental results, smoke filling characteristicsResults showed that smoke filling velocity combined with sprinkler cooling and natural smoke exhausthas a very small difference; the final height of smoke reduces with sprinkler cooling; for the range

Keywords： fire protection engineering     sprinkler spray     sprinkler cooling     natural smoke exhaust     smoke filling    

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Experimental study on the control of black smoke pollution from the ceramic kilns based on the mechanism

CUI Xiao, LI Caiting, WANG Fei, LI Shanhong, XIAO Chenchang, PENG Yu, ZHAI Yunbo

Frontiers of Environmental Science & Engineering 2008, Volume 2, Issue 1,   Pages 109-115 doi: 10.1007/s11783-008-0021-0

Abstract: Aiming at the characteristics of carbon black, a new method of controlling the black smoke from the industrial
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Study of Fire Smoke Flow Characteristics of Horizontal Tunnel Using Longitudinal Ventilation

Lu Ping,Cong Beihua,Liao Guangxuan,Fan Weicheng,Li Peide

Strategic Study of CAE 2004, Volume 6, Issue 10,   Pages 59-64

Abstract:

The management of subway tunnel fire smoke is an important component in city public safety.In this paper, on the basis of theoretical analysis of the main factors affecting fire smoke flow inestablished to express the relationships between the critical environments, critical velocities, air speeds, smokeThe results can provide instructions for tunnel smoke managements and emergency handling.

Keywords： subway tunnel     fire smoke     buoyant effect     thermal resistance effect     critical velocity    

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The Influence of Flow Velocity on Response Sensitivity of Smoke Detectors

Xie Qiyuan,Su Guofeng,Yuan Hongyong,Zhang Yongming

Strategic Study of CAE 2005, Volume 7, Issue 11,   Pages 76-80

Abstract:

The objective of the work was to evaluate the performance of photoelectric and ionic smoke detectorsThe experiment results indicate that the sensitivity of the two kinds of smoke detectors decreases sharplyHowever, for the smoldering cottons at the entrance of FE/DE, the sensitivity of the ionic smoke detectorAccordingly, the ionization smoke detector is more suitable for those locations with high flow velocity

Keywords： flow velocity     smoke detectors     smoke particle     size distribution of particles    

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Elevator Configuration Based on the Markov Network Queuing Model

Zong Qun,Cheng Yiju,Song Junyuan

Strategic Study of CAE 2003, Volume 5, Issue 10,   Pages 69-72

Abstract: Based on the model elevator configuration parameters of the serving stations are calculated, comparingMeanwhile the result shows the validity and feasibility of the method applied to elevator configuration

Keywords： Markov network queuing theory     elevator traffic model     optimizing elevator configuration    

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Evaluation and Recombination of Property Right Configuration for Urban Water Supply System

Xiao Wen,Ouyang Fangrui,Wang Xianjia

Strategic Study of CAE 2004, Volume 6, Issue 7,   Pages 48-52

Abstract:

In this paper, two basic models of recombination of property right configuration for urban water supplyThe evaluation index and methodology of property right configuration for urban water supply system areThe characteristics of the two property right configuration models and actions of different benefit bodies

Keywords： urban water supply system     property right configuration     recombination of property right     evaluation of    

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Solution of Integral Equations and Experimental Analysis of Fire Smoke Plumes in Stably Linearly Thermally

Fang Jun,Shu Xueming,Yuan Hongyong,Zheng Xin

Strategic Study of CAE 2004, Volume 6, Issue 1,   Pages 37-43

Abstract: Measurements on the different fire smoke plumes in the medium-scale and big-scale experimental roomsavailable literatures, thus this work validates the integral model and provides a good foundation for the smoke

Keywords： stably linearly thermally stratified environment     fire smoke plume     solution of integral equations     experimental    

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Title Author Date Type Operation

Study on Fire Smoke Properties of Subway Station Passageway by Simulation Experiments

Zhu Wei,Lu Ping,Liao Guangxuan,Li Peide,Hong Yixiu

Journal Article

Effects of green roof damping and configuration on structural seismic response

Journal Article

Effect of cutterhead configuration on tunnel face stability during shield machine maintenance outages

Journal Article

Optimizing the configuration of a clearwell by integrating pilot and full-scale tracer testing

LIU Wenjun, DU Zhipeng, JIN Junwei

Journal Article

Tracing the impact of stack configuration on interface resistances in reverse electrodialysis by in situ

Journal Article

Study on Particle Size and Its Distribution Function of Standard Fire Smoke

Shu Xueming,Zheng Kui,Yuan Hongyong,Yao Bin

Journal Article

Passive convergence-permeable reactive barrier (PC-PRB): An effective configuration to enhance hydraulic

Journal Article

Efficient Configuration Space Construction and Optimization for Motion Planning

Jia Pan, Dinesh Manocha

Journal Article

National Fire Protection Association, Quincy, MA, 1995Study on smoke filling combined with sprinklercooling and natural smoke exhaust

Li Sicheng,Chen Ying,Hu Longhua,Huo Ran and Yang Dong

Journal Article

Experimental study on the control of black smoke pollution from the ceramic kilns based on the mechanism

CUI Xiao, LI Caiting, WANG Fei, LI Shanhong, XIAO Chenchang, PENG Yu, ZHAI Yunbo

Journal Article

Study of Fire Smoke Flow Characteristics of Horizontal Tunnel Using Longitudinal Ventilation

Lu Ping,Cong Beihua,Liao Guangxuan,Fan Weicheng,Li Peide

Journal Article

The Influence of Flow Velocity on Response Sensitivity of Smoke Detectors

Xie Qiyuan,Su Guofeng,Yuan Hongyong,Zhang Yongming

Journal Article

Elevator Configuration Based on the Markov Network Queuing Model

Zong Qun,Cheng Yiju,Song Junyuan

Journal Article

Evaluation and Recombination of Property Right Configuration for Urban Water Supply System

Xiao Wen,Ouyang Fangrui,Wang Xianjia

Journal Article

Solution of Integral Equations and Experimental Analysis of Fire Smoke Plumes in Stably Linearly Thermally

Fang Jun,Shu Xueming,Yuan Hongyong,Zheng Xin

Journal Article