Performance-Based Design and Assessment of Buildings under Extreme Snow Loads

这项研究的目的是开发一个新的框架，以性能为基础的设计和评估的建筑物承受大雪负荷。近年来，美国的暴风雪造成了结构故障，需要花费高昂的维修费用，中断业务，破坏建筑内容，危及生命安全。基于性能的方法可以通过在结构设计决策中明确考虑雪引起的坍塌和建筑物关闭的风险来改进当前的雪工程方法。研究方法从开发将雪灾与结构响应和建筑性能联系起来的概率模块框架，到在雪荷载作用下结构倒塌和建筑物倒塌风险的非线性模拟建模和概率评估，以及在多危险背景下雪荷载设计程序的应用。成果包括将基于性能的积雪设计框架应用于典型的平顶和特殊场馆类型的结构的演示，用于评估积雪设计决策和建筑规范规定的工具，研究成果的文档，以及为加州大学土木工程专业本科生研究人员举办的一系列座谈会。这项研究旨在开发一种新的建筑设计工具，以改进对结构失效和建筑关闭风险的表征，以抵御积雪荷载。这些进展将有助于作出决定，最大限度地减少对生命和财产的风险，从而改进个别建筑的设计，并重新审查有关积雪的规范规定。由于与全球气候变化相关的天气模式日益多变，这些事态发展尤其及时。该项目将吸引一批不同的本科生研究人员，以促进学生对结构和危险研究的兴趣，并培养土木工程专业的研究生。本科生和研究生研究人员将参加由P.I组织的新的系研究座谈会，以增加对系和更广泛的学术界的参与。

The objective of this research is to develop a new framework for performance-based design and assessment of buildings subjected to large snow loads. Snow storms in recent years in the U.S. have caused structural failure, requiring costly repairs, interrupting business, damaging building contents and endangering life safety. Performance-based methods can improve the current approach to snow engineering by explicitly accounting for the risks of snow-induced collapse and building closure in decisions about structural design. The research approach progresses from the development of a probabilistic modular framework to relate snow hazard to structural response and building performance, to nonlinear simulation modeling and probabilistic assessment of the risk of collapse and building closure in structures subjected to snow loads, and to the application of snow load design procedures in a multi-hazard context. Deliverables include the demonstration of the application of the performance-based framework for snow design to typical flat-roof and special arena-type structures, tools for evaluating snow design decisions and building code provisions, documentation of research results, and a colloquia series for undergraduate researchers in civil engineering at CU. This research seeks to develop a new tool for design of buildings to resist snow loads, based on improved characterization of risks of structural failure and building closure. These advancements will facilitate decisions to minimize risk to life and property, leading to improved design of individual buildings and reexamination of code provisions for snow loading. These developments are particularly timely due to increasingly variable weather patterns associated with global climate change. The project will engage a diverse group of undergraduate researchers to promote student interest in structures and hazards research and in pursuing graduate students in civil engineering. Undergraduate and graduate researchers will participate in a new department research colloquia organized by the P.I to increase engagement in the department and wider scholarly community.