大跨度复杂屋盖积雪漂移堆积机理、过程模拟与实测研究

项目名称： 大跨度复杂屋盖积雪漂移堆积机理、过程模拟与实测研究

项目编号： No.51478147

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑科学

项目作者： 范峰

作者单位： 哈尔滨工业大学

项目金额： 90万元

中文摘要： 随着全球范围内极端天气现象的逐渐增加，因积雪造成的屋盖结构坍塌事故也 在逐渐增多。大跨度和轻型结构是对雪荷载敏感的结构体系，因此雪荷载的取值是其设计过程中的一个重要考虑因素。此外，近年来，大跨度和轻型结构在我国得到大范围应用，对雪荷载设计方法有着十分迫切的应用需求。本项目针对积雪漂移的形成机理、数值模拟方法和风洞试验方法等开展基础研究，并结合实际结构的现场实测结果，对大跨度复杂屋盖的雪荷载分布情况进行系统分析与总结，建立相对完整的雪荷载设计方法。主要研究内容包括：（1）大跨度屋盖积雪分布的现场实测与影响因素分析；（2）积雪的物理性质和风对积雪漂移的作用机理；（3）积雪漂移的数值模拟与风洞试验方法；（4）大跨度复杂屋盖的雪荷载设计方法体系的建立。本项目的开展，可提高我国对屋面雪荷载的认识与研究水平，并可为实际工程的雪荷载取值与我国荷载规范的修订提供依据。

中文关键词： 大跨度复杂屋盖；积雪漂移；堆积机理；过程模拟；实地测量

英文摘要： Snow-induced roof collapses are increasing around the world partly because of the increasing in extreme weather events such as snowstorms. When designing snow-load-sensitive structures, such as large-span roofs and lightweight steel structures which are widely used over the country, snow load is one of the principal design loads. Furthermore, rationale for the code recommended design snow load is not clear and has not been calibrated using newly developed probability methods or verified with field observed snow depth information. This project is mainly focused on estimating the required design snow load considering the physic process of and uncertainty in snow accumulation such that the designed structures are sufficiently safe and economic. To achieve this objective, the tasks of the project are concentrated on: （1）full-scale and model-scale measurements of snow depth on roofs and analysis of factors that influence it; (2) properties of snow pack and the role of wind in the accumulation of snow on roofs; (3) methods of simulating snowdrift with numerical model and in wind tunnel; (4) estimation of the required design snow load on large-span roofs for codified use. The funding of this project will increase the needed research activity in snow load on large-span roofs to reduce possible economic losses and fatalities caused by snowstorms. The tasks and research results are essential for calibrating the codified snow load implemented in the national building code.

英文关键词： complex large-span roofs;snowdrift;snow accumulation;physic-based modeling;field measurement