Research on Components of Entrance and Exit Function Area of Urban Central Business District Underground Parking System

The construction of underground parking system has been widely used in the central business districts of major cities in China, but the arrangement of entrance and exit spacing of underground parking units is unreasonable. This leads to low operation efficiency and a low utilization rate of the underground parking system. However, whether the distance between the entrances and exits of underground parking units is reasonable depends on whether the upstream and downstream functional areas of the entrances and exits of underground parking units will overlap. Overlapping functional areas will cause queuing congestion between entrances and exits when vehicles enter or exit the underground parking unit. Through the analysis of factors affecting the distance between the entrances and exits of the internal parking units of the underground parking system, the calculation model of the elements of the upstream and downstream functional areas of the entrances and exits is proposed. The research results provide a reference basis for the reasonable layout of the internal parking units in urban underground parking system and have a certain guiding significance for planning and design of underground parking system.