The central business district is a densely populated area, compared with other evacuation modes, pedestrian evacuation is the most effective evacuation mode in case of emergency. During emergency evacuation, the pace of the crowd and the effective width of the roads are closely relevant. At present, there are differences in the setting of effective width of road in the central business district at home and abroad, and they pay more attention to the general traffic value of road, without too much research and exploration on the setting of effective width of road in emergency evacuation. In the case of limited space resources, it is increasingly important to study the effect of effective width of road on pedestrian evacuation in the central business district. Based on this, this paper conducts Research measure on the effective width of road, business center of the Three Gorges Square in Chongqing. After research measuring, it is modally analyzed according to relevant regulation. The result of the research shows that the main pedestrian road of Three Gorges Square can’t meet the demands of the urgent evacuation. And when the effective width of the roads w ≥7.6 m, it can meet the demands of high-density pedestrian evacuation in commercial center.
Pedestrian evacuation is an important measure to ensure disaster safety in central retail districts, the efficiency of which is affected by the synergy of road network planning indices. This paper established the typical forms of central retail district (CRD) road networks in terms of block form, network structure and road grade, taking China as an example. The experiment was designed using the orthogonal design of experiment (ODOE) method and quantified the evacuation time under different road network planning indices levels through the Anylogic simulation platform. Using range and variance analysis methods, the synergy of network density, network connectivity, road type and road width on pedestrian evacuation efficiency were studied from the perspectives of significance, importance and optimal level. The results showed that the type of CRD will affect the importance of network planning indices, and that the network connectivity is insignificant (P 0.477/0.581) in synergy; networks with wide pedestrian primary roads (30.1~40.0 m), medium secondary roads (3.1~5.0 m/side) and high density (11.0~13.0 km/km2) have the highest evacuation efficiency. From the perspective of evacuees, this paper put forward urban design implications on CRD road networks to improve their capacity for disaster prevention and reduction.
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