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维基百科对BIM的定义是:BIM涵盖了几何学、空间关系、地理信息系统、各种建筑构件(如供应商的详细信息)的性质及数量。建筑信息模型可以用来显示整个生命周期的建设,包括了建设和运营的过程。建材信息的提取非常方便,每个部分、每个系统都可以提供。建筑信息模型用数字化的建筑组件表示真实世界中用来建造建筑物的构件。对于传统电脑辅助设计用矢量图形构图来表示物体的设计方法来说是个基本的改变,因为它能够结合众多图则来展示对象。

美国国家BIM标准(The National Building Information Modeling Standards Committee简称NBIMS)对BIM的定义如下:
“A Building Information Model(BIM)is a digital representation of physical and functional characteristics of a facility,As such it serves as a shared knowledge resource for information about a facility forming a reliable basis for decisions during its life-cycle from inception onward.
A basic premise of BIM is collaboration by different stakeholders at different phases of the life-cycle of a facility to insert、extract、update or modify information in the BIM process to support and reflect the roles of that stakeholder.The BIM is a shared digital representation founded on open standards for interoperability.”
该定义的中心思想是BIM是利用数字技术进行建设项目设计、施工、运营的过程,过程的成果是一个信息丰富的多维项目模型——即BIM模型。

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