活力使空间产生多功能的、集中而频繁交流的能力，是影响城市广场社会作用的重要因素。以重庆市三峡广场之中心下沉式广场为调研对象，通过实地拍照观测，对该广场的活力产生的来源——人的活动进行类型和数量上的分析，得出其活力不足的状况；在此基础上，从吸引力、方便性、适应性三个方面探析该广场活力缺失的本原因素——场所。研究发现：人和场所是构成广场活力的基本因素，人的活动需要具有独特魅力的场所，要从场所的空间物质构成及文化内涵着手，方能塑造富有活力的广场空间。%Vitality endows the space with multiple functions and frequent communication capacity, and has been an important factor in affecting the social function of city square. Central sunken square is a part of the Three Gorges Plaza in Chongqing, and the paper analyzes the type and number of human activities, which is the source and appearance of vitality by field camera observation, and draws the conclusion of its insufficient vitality. On this basis, the paper then analyzes place element, the origin of vitality, in the three aspects of attractiveness, convenience and adaptability. It is found that people and place are the basic elements of square vitality, and human activities require place of the unique charm. Only pay close attention to the spacial material construction and cultural connotation of the place, can we create a square full of vitality.
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