Improved consideration of dynamic loads and effects in design of exposed structures

在裸露结构的设计中改进了对动态载荷和效应的考虑

• 批准号: 121270-2013
• 负责人: McClure, Ghyslaine
• 金额: $ 1.89万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=545289
• 关键词: Improved; consideration; dynamic; loads; effects

Current structural engineering practice continues to rely extensively on static analysis methods for design. After over 30 years of extensive use of the limit states or reliability-based design method in most structural design codes worldwide, this approach has exposed its weaknesses for assessing the mechanical security and integrity of critical structures exposed to extreme environmental loads. The performance-based design approach introduced in recent years relies heavily on past methods, essentially accepting limit-states design solutions as acceptable solutions, leaving the issues of security and integrity to the interpretation of designers. Most extreme environmental loads have potentially dynamic effects on exposed structures, and consideration of failure or progressive collapse scenarios cannot generally ignore those dynamic effects when predicting structural response. As such, true performance-based design precludes reliable and relatively accurate response prediction that is rarely feasible with simplified static methods.

目前的结构工程实践仍然广泛依赖于静态分析方法进行设计。经过30多年的广泛使用的极限状态或基于可靠性的设计方法在大多数结构设计规范在世界各地，这种方法暴露了其弱点评估的机械安全性和完整性的关键结构暴露在极端的环境载荷。近年来引入的基于性能的设计方法在很大程度上依赖于过去的方法，基本上接受极限状态设计解决方案作为可接受的解决方案，将安全性和完整性的问题留给设计师来解释。大多数极端环境荷载对暴露结构具有潜在的动力效应，在预测结构响应时，考虑破坏或连续倒塌情况通常不能忽略这些动力效应。因此，真正的基于性能的设计排除了可靠和相对准确的响应预测，这在简化的静态方法中很少可行。