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

飓风引发的风雨会对房屋造成灾难性的破坏。该合作方案旨在研究飓风对单户住宅结构的逐步破坏。本文将重点研究木质住宅复杂结构的内部压力传播、风雨对压力的影响以及非线性分析的发展。在分析工作中，将采用适当的正交分解和数据库辅助损伤预测技术。风压/载荷数据将从路易斯安那州立大学进行的1:50比例风洞试验中获得；在哈尔滨工业大学（中国）以1:10的比例进行了测试，并在佛罗里达国际大学的12扇风墙设施进行了近乎全尺寸的测试。这些试验将为研究风荷载对结构损伤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式损伤传播和构件失效机理。获得的新知识将有可能开发改造程序以减少损害。与外国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。拟议的研究解决了飓风对住宅建筑的影响，这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加载输入的数据库辅助损伤预测将使渐进式破坏分析成为可能，但使用适当的正交分解将大大减少计算成本。分析程序将遵循为地震工程开发的程序。将开发住宅结构对风荷载响应的非线性程序。研究成果包括：(1)飓风对住宅建筑的影响及其相互作用方面的知识进步，为灾害预测和结构设计/减灾提供更现实和准确的荷载输入；(2)通过了解荷载路径和破坏模式，增强新建和现有结构的飓风恢复能力；(3)制定减灾指南，对现有住房进行改造。遵循地震工程的路径，研究方法将有助于建立合理的基于性能的风力工程设计和缓解方法。这将最终减少飓风和强风相关事件造成的损失。

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.