CAREER: Impact of Green Roof and Vertical Greenery Systems on Structural Performance for Multi-Hazard Scenarios

该学院早期职业发展（CAREER）奖将通过为绿色基础设施（GI）（即绿色屋顶和垂直绿化结构）提供新颖的设计方法，以减少与这些事件相关的金钱损失、死亡和停机时间，从而提高社区应对气候变化和从地震等自然灾害事件中恢复的弹性和能力。应对气候变化需要具有 GI 的可持续结构。这项研究将通过一套针对 GI 重量变化的应用指南，包括在不同含水量水平下实现最佳结构性能的相关要求，解决具有地震/风风险地区的 GI 建筑执业工程师和用户的资源严重缺口。该教育计划包括针对本科生和研究生的可持续结构弹性的教育视频系列，以及针对来自代表性不足群体的五名大学生助理的研究经验。此外，开放获取研究成果、设计指南和新的教育材料将告知加州州立大学系统的土木工程学生、美国的执业土木工程师和公众消费者，以加大可持续发展力度，减少气候变化和自然灾害事件的负面影响。该项目生成的数据将在美国国家科学基金会 (NSF) 支持的自然灾害工程研究基础设施数据仓库 (https://www.DesignSafe-CI.org) 中公开提供。该奖项支持 NSF 在国家地震减灾计划中的作用。 该奖项的目标是增进对地理标志敏感性、对结构行为的影响以及作为缓解策略的潜力的了解。人们已经确定需要将结构响应描述为可持续设计和弹性设计之间的综合努力，因为过去几十年来 GI 使用的增长速度已经超过了支持工程界设计工作的研究速度。该项目的研究目标包括：（1）量化由于自然灾害（即干旱、风暴潮）、自然生长和其他生命周期因素（即维护不良）引起的地理标志变化而导致的结构行为分布； (2) 制定提高抗震性能的初始设计策略； (3) 考虑地理标志的变化，为可持续结构制定一套变革性的设计指南。这将通过模态行为的敏感性分析以及使用地震场景的非线性时程分析来测试战略 GI 计划来实现。教育目标是培训下一代土木工程师通过新的、开放的教育材料了解可持续建筑设计，并向执业土木工程师和公众通报可持续发展努力的积极影响，以减少气候变化和风/地震事件的负面影响。告知和建立工程对 GI 设计的信心将：(1) 通过改进设计、建模和分析程序来提高结构弹性； (2) 减少与结构失效相关的人力/经济成本； (3) 在促进可持续发展的同时增加地理标志的使用。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

This Faculty Early Career Development (CAREER) award will contribute to the resilience and capacity of communities to address climate change and recover from natural hazard events, such as earthquakes, by producing a novel design approach for green infrastructure (GI) (i.e., green roof and vertical greenery structures) to decrease monetary losses, deaths, and downtime associated with these events. Sustainable structures with GI are needed to tackle climate change. This research will address a critical gap in resources for practicing engineers and users of buildings with GI in regions with seismic/wind risk with a set of applied guidelines for weight variations of GI, including associated demands at various moisture content levels for optimal structural performance. The educational plan includes an educational video series on sustainable structural resilience for undergraduate and graduate students and research experiences for five university student assistants from underrepresented groups. Further, open access to research results, design guidelines, and new educational materials will inform civil engineering students in the California State University system, practicing civil engineers in the U.S., and public consumers to increase sustainability efforts and decrease negative impacts of climate change and natural hazard events. Data generated from this project will be made publicly available in the National Science Foundation (NSF)-supported Natural Hazards Engineering Research Infrastructure Data Depot (https://www.DesignSafe-CI.org). This award supports the NSF role in the National Earthquake Hazards Reduction Program. The goal of this award is advance knowledge on GI’s sensitivities, influences on structural behavior, and potential as a mitigation strategy. There is an established need to characterize structural response as a combined effort between sustainable and resilient design because the increase in GI usage over the past several decades has outpaced research to support the engineering community in its design efforts. The project’s research objectives include: (1) quantification of structural behavior distributions due to changes in the GI from natural hazards (i.e., drought, storm surge), natural growth, and other life-cycle factors (i.e., poor maintenance); (2) development of an initial design strategy for increased seismic performance; and (3) creation of a transformative set of design guidelines for sustainable structures considering GI variabilities. This will be achieved through sensitivity analyses of modal behavior and testing of a strategic GI plan using nonlinear time history analyses for a seismic scenario. The educational goals are to train the next generation of civil engineers to understand sustainable building designs with new, open-access educational materials and to inform practicing civil engineers and the public about the positive impacts of sustainability efforts that decrease the negative impacts of climate change and wind/seismic events. Informing and building engineering confidence in GI design will: (1) increase structural resilience with improved designs, modeling, and analysis procedures; (2) reduce the human/economic costs associated with structural failure; and (3) increase the use of GI while promoting sustainability.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.