Collaborative Research: Progressive Failure Studies of Residential Houses towards Performance Based Hurricane Engineering

合作研究：针对基于性能的飓风工程的住宅渐进式失效研究

• 批准号: 1233991
• 负责人: Steve C.S. Cai
• 金额: $ 21.79万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2018-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1233991&HistoricalAwards=false
• 关键词: Collaborative; Research; Progressive; Failure; Studies

Hurricane-induced wind and rain can cause catastrophic damages to homes. This collaborative proposal pursues research in progressive damage to single family residential structures under hurricane winds. The research will focus on propagation of internal pressures, influence of wind-driven rain on pressures, and development of nonlinear analysis for the complex structures of wood residential buildings. For analytical work proper orthogonal decomposition and database-assisted-damage-prediction techniques will be used. The wind pressure/load data will be obtained from wind tunnel tests conducted at Louisiana State University at the scale of 1:50; tests conducted at Harbin Institute of Technology (China) at the scale of 1:10, and nearly full-scale tests conducted at Florida International University's 12-fan Wall of Wind facility. The tests will provide opportunity to study impact of wind loads on damage causing mechanism and development of fragility curves. The research will allow understanding of progressive damage propagation and component failure mechanism. New knowledge gained will have the potential of developing retrofitting procedures to reduce the damage. Collaboration with foreign partner will enhance research capability. Students working on the project will gain experience in wind effects on structures and in hurricane engineering.The proposed research addresses hurricane effects on residential buildings that are one of the most vulnerable and complex structures. While a database-assisted-damage-prediction that directly uses time variant wind pressures as loading inputs will make the progressive failure analysis possible, using the proper orthogonal decomposition will greatly reduce the computational cost. The analytical procedure will follow the procedures developed for earthquake engineering. Nonlinear procedures will be developed for response of residential structures to wind loads. The research outcomes are (1) knowledge advancement on hurricane impacts on and interactions with residential constructions, leading to more realistic and accurate loading inputs for damage predictions and structural designs/mitigations, (2) enhancement of hurricane resiliency of new and existing structures by understanding the load paths and failure modes, and (3) development of mitigation guidelines to retrofit the existing housing stock. Following the path of earthquake engineering, the research methodology will help establish a rational performance-based design and mitigation approach for wind engineering. This will eventually reduce losses due to hurricane and strong wind-related events.

飓风引发的风雨会对房屋造成灾难性的破坏。这项合作提案旨在研究飓风对单一家庭住宅结构的渐进破坏。本研究将着重于木结构住宅复杂结构的内压传播、风雨对内压的影响及非线性分析的发展。对于分析工作，将使用适当的正交分解和数据库辅助损伤预测技术。风压/荷载数据将从在路易斯安那州立大学进行的1：50比例的风洞试验、在哈尔滨工业大学（中国）进行的1：10比例的试验以及在佛罗里达国际大学的12扇风墙设施进行的近全尺寸试验中获得。这些试验将为研究风荷载对结构破坏机理和脆性曲线发展的影响提供机会。该研究将有助于理解渐进损伤扩展和构件失效机理。所获得的新知识将有可能制定改进程序，以减少损害。与外国合作伙伴的合作将提高研究能力。参与该项目的学生将获得风对结构的影响和飓风工程方面的经验。拟议的研究涉及飓风对住宅建筑的影响，住宅建筑是最脆弱和最复杂的结构之一。虽然直接使用时变风压作为荷载输入的数据库辅助损伤预测将使渐进失效分析成为可能，但使用适当的正交分解将大大降低计算成本。分析程序将遵循为地震工程开发的程序。非线性程序将开发住宅结构响应的风荷载。研究成果是：（1）飓风对住宅建筑的影响和相互作用的知识进步，导致更现实和准确的负荷输入的损害预测和结构设计/缓解，（2）通过了解负载路径和故障模式，提高新的和现有结构的飓风弹性，（3）缓解指南的发展，以改造现有的住房存量。遵循地震工程的路径，研究方法将有助于建立一个合理的基于性能的设计和减灾方法的风工程。这将最终减少飓风和强风相关事件造成的损失。