摘要:城市更新是指对城市现有的建筑和基础设施进行改造和升级，而大型既有建筑改造往往是城市更新中的重难点。本文以昆明融通中心改造项目为例，进行大型既有建筑改造设计的数字化路线探索。该项目在主体结构封顶后无任何防护措施的情况下闲置至今近25年，为对其进行加固改造，项目团队提出了“五套模型”体系——环境原状模型、结构原状模型、结构优化模型、全专业低碳优化模型以及数字孪生模型。通过基于五套模型体系的大型既有建筑改造设计的数字化技术路径，促进大型既有建筑的改造提升和绿色化、数字化建设的可行性和可靠性。

Abstract: Urban renewal refers to the transformation and upgrading of existing buildings and infrastructure in a city, and large-scale existing building renovation is often the key and difficult point in urban renewal. This article takes the Kunming Rongtong Center renovation project as a case to explore the digital route of large-scale existing building renovation design. The project has been vacant for nearly 25 years without any protective measures after the completion of its main structure. In order to reinforce and renovate it, the project team proposed a "five set model" system - environmental intact model, structural intact model, structural optimization model, full professional low-carbon optimization model, and digital twin model. Through the digital technology path of large-scale existing building renovation design based on five sets of model systems, promote the feasibility and reliability of the renovation, greening, and digital construction of large-scale existing buildings.