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

飓风引发的风雨可能会对房屋造成灾难性的破坏。这项合作提案致力于研究飓风对独户住宅结构的渐进式破坏。研究将集中在内部压力的传播，风致降雨对压力的影响，以及木质住宅复杂结构的非线性分析的发展。对于分析工作，将使用适当的正交分解和数据库辅助的损害预测技术。风压/荷载数据将来自路易斯安那州立大学1：50比例的风洞试验、哈尔滨工业大学(中国)1：10比例的试验以及佛罗里达国际大学12扇风墙设施的近全尺寸试验。这些试验将为研究风荷载对破坏机理的影响和易损性曲线的发展提供机会。这项研究将有助于了解渐进损伤扩展和部件失效机理。获得的新知识将有可能制定改装程序，以减少损害。与外国合作伙伴的合作将提高研究能力。从事该项目的学生将获得风对建筑物的影响和飓风工程方面的经验。拟议的研究针对住宅建筑的飓风影响，住宅建筑是最脆弱和复杂的建筑物之一。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破坏分析成为可能，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制定的程序。将开发住宅结构对风荷载响应的非线性程序。研究成果是(1)关于飓风对住宅建筑的影响及其相互作用的知识进步，从而为损害预测和结构设计/缓解带来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，提高新结构和现有结构的飓风恢复力；以及(3)制定缓解指南，以翻新现有的住房存量。沿着地震工程的道路，该研究方法将有助于建立一种合理的基于性能的风工程设计和减灾方法。这最终将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.