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

目前的结构工程实践仍然广泛地依靠静力分析方法进行设计。极限状态或基于可靠性的设计方法在世界上大多数结构设计规范中被广泛使用了30多年，这种方法在评估极端环境荷载下关键结构的机械安全性和完整性方面暴露出其弱点。近年来引入的基于性能的设计方法严重依赖于过去的方法，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，考虑破坏或渐进倒塌的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，而简化的静态方法很少可行。

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.