In this paper, we conduct a trajectory-based analysis on pedestrian turning movement on a stair landing. The extracted trajectories indicate pedestrians walk along arc paths. The compression effect resulting from pedestrians’ desire to seek the shortest path during the turning movement is not observed. Based on the developing trends of angular speed and speed, two phases can be distinguished during the whole turning process, namely deceleration and uniform speed phase when moving downstairs, and acceleration and uniform speed phase when moving upstairs. According to the fundamental diagrams, compared with ascent movement, pedestrians move faster when going downstairs on the stair landing, and the speed is much lower than that in the straight corridor, due to the effect of turning movement and stairs. Two regimes can be spotted from the fundamental diagrams. When the density is lower than the critical one, the speed decreases sharply with the increase of density, while it decreases smoothly when the density is higher than the critical one. According to the density distributions, the area with the maximal density occurs after turning for descent movement, while it occurs before turning for ascent movement. Taking the average speed computed from trajectories as a reference, we further provide some empirical values for parameters (e.g., the turning radius of the arc path) proposed in the method based on hypothetical travel path.

在本文中，我们对楼梯平台上的行人转弯运动进行了基于轨迹的分析。提取的轨迹表明行人沿着弧形路径行走。没有观察到行人在转弯运动中寻求最短路径所产生的压缩效应。根据角速度和角速度的发展趋势，在整个转弯过程中可以区分出两个阶段，即下楼时的减速和匀速阶段，上楼时的加速和匀速阶段。根据基本图，与上升运动相比，由于转弯运动和楼梯的影响，在楼梯平台下楼时，行人的移动速度较直走廊慢得多。从基本图中可以看出两种制度。当密度低于临界值时，速度随着密度的增加而急剧下降，而当密度高于临界值时，速度平稳下降。根据密度分布，密度最大的区域出现在下降运动转弯之后，而出现在上升运动转弯之前。以从轨迹计算出的平均速度为参考，我们进一步为基于假设行驶路径的方法中提出的参数（例如，圆弧路径的转弯半径）提供了一些经验值。根据密度分布，密度最大的区域出现在下降运动转弯之后，而出现在上升运动转弯之前。以从轨迹计算出的平均速度为参考，我们进一步为基于假设行驶路径的方法中提出的参数（例如，圆弧路径的转弯半径）提供了一些经验值。根据密度分布，密度最大的区域出现在下降运动转弯之后，而出现在上升运动转弯之前。以从轨迹计算出的平均速度为参考，我们进一步为基于假设行驶路径的方法中提出的参数（例如，圆弧路径的转弯半径）提供了一些经验值。