美国建筑连续性倒塌设计标准的现状

Development of American building progressive collapse design criteria

1968年英国Ronan Point大厦发生连续性倒塌后,包括英国、加拿大、美国在内的许多发达国家的研究人员对结构的连续性倒塌问题进行了大量的研究,并逐步将研究成果写入各类标准。美国总务局和国防部分别出版旨在帮助其管辖的建筑建立抵抗连续性倒塌性能的GSA标准和UFC标准,是目前最为系统、全面和实用的两部标准。论述了当前有关连续性倒塌标准的基本方法;详细阐述了UFC标准和GSA标准关于结构连续性倒塌的概念、设计方法、设计过程以及实施步骤等问题的规定;在以上论述的基础上总结了美国当前连续性倒塌设计标准的特点与不足并为建筑物连续性倒塌设计的进一步研究工作提供了思路。

Much of research have been done by professionals of many developed countries including Britain, Canada and America since the progressive collapse of the British Ronan Point Building oceurred in 1968, and the research findings written into some different criteria. The United States General Services Administration and the United States Department 0f Defense respectively published GSA criteria and UFC criteria about progressive collapse to set up the capability of these buildings to resist progressive collapse. GSA and UFC are the most systemic, comprehensive and applied criteria up to now. In this paper, the basic methods about progressive collapse were introduced. Discussions about the conception, design method, and design process of progressive collapse in the UFC criteria and GSA criteria were provided. The characteristic and deficiency of those codes were generalized based on the foregoing discussion. The clues for the future job about building progressive collapse were provided for the professionals.