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原文传递 Design Ground Snow Loads: Historical Perspective and State of the Art

题名：	Design Ground Snow Loads: Historical Perspective and State of the Art
正文语种：	eng
作者：	Al-Rubaye, Salam;Maguire, Marc;Bean, Brennan
作者单位：	Univ Nebraska Lincoln Durham Sch Architectural Engn & Construct 1110 S 67th St Omaha NE 68182 USA;Univ Nebraska Lincoln Durham Sch Architectural Engn & Construct 1110 S 67th St Omaha NE 68182 USA;Utah State Univ Dept Math & Stat 3900 Old Main Hill Logan UT 84322 USA
摘要：	This paper reviews the development of snow load research since the contemporary introduction and calibration of the ANSI A581982 provisions (and subsequent ASCE 7-88). The ASCE 77-88 ground snow loads were based on the data and methods available at the time and subsequently updated in 1995. The provided loads are based on 50-year mean recurrence intervals, with design loads for each category being obtained through a combination of partial safety and importance factors. Changes and improvements in snow load design over the last 40 year necessitate a reconsideration of the original calibration of these safety and importance factors. This paper discusses the need for a movement away from a uniform-hazard snow load design approach in combination with uniform load and importance factors, in favor of reliability-targeted design snow loads. This paper reviews the concept of reliability targeted loads as a means of meeting the ASCE 7 goal of uniform risk/reliability in the US. This paper further describes the incremental changes in both reliability and snow load research that will culminate in a change from uniform hazard (i.e. 50-year) loads to uniform-reliability loads. The purpose of this paper is to describe the motivation for, and historical context of E 7, the forthcoming changes to design ground snow loads in ASCE 7-22. Furthermore, the paper discusses the future of snow load prediction and its impact on the engineer and the code, particularly in regards to the implications of climate change for future snow load design. (C) 2022 American Society of Civil Engineers.
出版年：	2022
期刊名称：	Journal of structural engineering
卷：	148
期：	6
页码：	03122001.1-03122001.12