Abstract
Building exit has always been an emphasis of research in the field of evacuation. Existing studies on crowd flow characteristics at building evacuation bottlenecks usually focus on plane exit, but insufficient attention has been paid to the characteristics of crowd flow at the convex exit. Convex exit can be considered as such a structure like a double-bottleneck linked passage. This paper aims to study the influence of geometric structure characteristics of the convex exit on crowd evacuation and put forward the optimal design strategy of this structure, so as to improve the efficiency of evacuation in an emergency. Using social force model-based software, MassMotion, it is found that convex exit is indeed more efficient and safer than common plane exit in terms of evacuation time and pedestrians’ congestion, especially when the desired speed is relatively higher, indicating that convex exits are more suitable for crowd evacuation in case of emergency. Four size-related parameters of convex exit are analyzed in detail, namely the width of the bottleneck at passage (Wp), the passage width (W), the passage length (L), and the exit width (We), to find out the optimum design of convex exit. The research shows that the optimal size ratio is that Wp:W:L:We equals 1.5:1.75:3.5:1, and as the overall magnification of building size and the number of pedestrians increases, the evacuation time gradually tends to a stable value, which indicates that this optimal ratio has good adaptability in size effect. Finally, based on the in-depth mechanism of pedestrian flow at the convex exit, three possible application scenarios are proposed to illustrate the feasible optimum design of the convex exit. The results of this study can provide new ideas for research on the structure of building exits.
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References
Alizadeh R (2011). A dynamic cellular automaton model for evacuation process with obstacles. Safety Science, 49: 315–323.
Cuesta A, Ronchi E, Gwynne SMV, et al. (2017). School egress data: Comparing the configuration and validation of five egress modelling tools. Fire and Materials, 41: 535–554.
Echeverría-Huarte I, Zuriguel I, Hidalgo RC (2020). Pedestrian evacuation simulation in the presence of an obstacle using self-propelled spherocylinders. Physical Review E, 102: 012907.
Garcimartín A, Maza D, Pastor JM, et al. (2018). Redefining the role of obstacles in pedestrian evacuation. New Journal of Physics, 20: 123025.
Ha V, Lykotrafitis G (2012). Agent-based modeling of a multi-room multi-floor building emergency evacuation. Physica A: Statistical Mechanics and Its Applications, 391: 2740–2751.
Haghani M, Sarvi M (2019). Simulating pedestrian flow through narrow exits. Physics Letters A, 383: 110–120.
Helbing D, Farkas I, Vicsek T (2000). Simulating dynamical features of escape panic. Nature, 407: 487–490.
Imanishi M, Jo AD, Sano T (2021). Effects of pedestrian motivation and opening shape on pedestrian flow rate at an opening. Fire Safety Journal, 120: 103056.
Jia X, Yue H, Tian X, et al. (2017). Simulation of pedestrian flow with evading and surpassing behavior in a walking passageway. Simulation, 93: 1013–1035.
Khamis N, Selamat H, Ismail FS, et al. (2020). Optimized exit door locations for a safer emergency evacuation using crowd evacuation model and artificial bee colony optimization. Chaos, Solitons & Fractals, 131: 109505.
Li J, Jiang L, Shen C, et al. (2016). Human experiments for optimizing obstacles settings in a crowd system. Complex Systems and Complexity Science, 13: 22–26. (in Chinese)
Li Q, Gao Y, Chen L, et al. (2019). Emergency evacuation with incomplete information in the presence of obstacles. Physica A: Statistical Mechanics and Its Applications, 533: 122068.
Li Q, Liu Y, Kang Z, et al. (2020a). Improved social force model considering conflict avoidance. Chaos: An Interdisciplinary Journal of Nonlinear Science, 30: 013129.
Li L, Liu H, Han Y (2020b). An approach to congestion analysis in crowd dynamics models. Mathematical Models and Methods in Applied Sciences, 30: 867–890.
Marzouk M, Al Daour IA (2018). Planning labor evacuation for construction sites using BIM and agent-based simulation. Safety Science, 109: 174–185.
Mu HL, Lo SM, Song WG, et al. (2015). Impact of wedge-shaped design for building bottlenecks on evacuation time for efficiency optimization. Simulation, 91: 1014–1021.
Pan H, Zhang J, Song W (2020). Experimental study of pedestrian flow mixed with wheelchair users through funnel-shaped bottlenecks. Journal of Statistical Mechanics: Theory and Experiment, 2020: 033401.
Parisi DR, Dorso CO (2005). Microscopic dynamics of pedestrian evacuation. Physica A: Statistical Mechanics and Its Applications, 354: 606–618.
Parisi DR, Dorso CO (2007a). Morphological and dynamical aspects of the room evacuation process. Physica A: Statistical Mechanics and Its Applications, 385: 343–355.
Parisi DR, Dorso CO (2007b). Why “faster is slower” in evacuation process. In: Waldau N, Gattermann P, Knoflacher H, et al. (eds), Pedestrian and Evacuation Dynamics 2005. Berlin, Heidelberg: Springer.
Sano T, Ronchi E, Minegishi Y, et al. (2017). A pedestrian merging flow model for stair evacuation. Fire Safety Journal, 89: 77–89.
Shi X, Ye Z, Shiwakoti N, et al. (2019). Examining effect of architectural adjustment on pedestrian crowd flow at bottleneck. Physica A: Statistical Mechanics and Its Applications, 522: 350–364.
Tanimoto J, Hagishima A, Tanaka Y (2010). Study of bottleneck effect at an emergency evacuation exit using cellular automata model, mean field approximation analysis, and game theory. Physica A: Statistical Mechanics and Its Applications, 389: 5611–5618.
Tavares RM (2009). Finding the optimal positioning of exits to minimise egress time: A study case using a square room with one or two exits of equal size. Building Simulation, 2: 229–237.
Tian H, Dong L, Xue Y (2015). Influence of the exits’ configuration on evacuation process in a room without obstacle. Physica A: Statistical Mechanics and Its Applications, 420: 164–178.
Wang J, Zhang L, Shi Q, et al. (2015). Modeling and simulating for congestion pedestrian evacuation with panic. Physica A: Statistical Mechanics and Its Applications, 428: 396–409.
Wang J, Jin B, Li J, et al. (2019). Method for guiding crowd evacuation at exit: The buffer zone. Safety Science, 118: 88–95.
Xue S, Jiang R, Wong SC, et al. (2020). Wall-following behaviour during evacuation under limited visibility: Experiment and modelling. Transportmetrica A: Transport Science, 16: 626–653.
Yang X, Yang X, Wang Q, et al. (2020). Guide optimization in pedestrian emergency evacuation. Applied Mathematics and Computation, 365: 124711.
Yano R (2018). Effect of form of obstacle on speed of crowd evacuation. Physical Review E, 97: 032319.
Zhang Y, Ma J, Si Y, et al. (2017). Required width of exit to avoid the faster-is-slower effect in highly competitive evacuation. Chinese Physics B, 26: 084504.
Zhao Y, Li M, Lu X, et al. (2017). Optimal layout design of obstacles for panic evacuation using differential evolution. Physica A: Statistical Mechanics and Its Applications, 465: 175–194.
Zhao Y, Lu T, Fu L, et al. (2020). Experimental verification of escape efficiency enhancement by the presence of obstacles. Safety Science, 122: 104517.
Zheng X, Zhong T, Liu M (2009). Modeling crowd evacuation of a building based on seven methodological approaches. Building and Environment, 44: 437–445.
Zuriguel I, Parisi DR, Hidalgo RC, et al. (2014). Clogging transition of many-particle systems flowing through bottlenecks. Scientific Reports, 4: 7324.
Acknowledgements
This research was sponsored by the National Natural Science Foundation of China (No. 71774079), the Major Natural Science Research Projects in Colleges and Universities of Jiangsu Province (No. 19KJA460011), the National Natural Science Foundation of China (No. 51874182), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (No. SJCX21_0438), and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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Li, J., Wang, J., Li, J. et al. Research on the influence of building convex exit on crowd evacuation and its design optimization. Build. Simul. 15, 669–684 (2022). https://doi.org/10.1007/s12273-021-0858-8
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DOI: https://doi.org/10.1007/s12273-021-0858-8