BRITE Synergy: Holistic Framework for Structural Stability Design of Buildings

这个促进工程变革和公平进步的研究思路（BRITE）协同项目将综合建筑结构稳定性的不同研究思路，创建一个整体的评估和设计框架，在广泛的现实世界场景中始终如一地应用基本原则。这些场景包括：低地震，风是最重要的，行为名义上是弹性的；中地震，其性能通常是非弹性的，延性反应低，退化严重；具有高延性的非弹性高地震反应。在所有情况下，无论响应是静态的还是动态的，不稳定的根本原因是重力作用于变形的系统结构的影响。该项目将把当前的研究成果和行业实践结合起来，形成对稳定性行为的一致看法。在美国，考虑多种荷载条件和危险将包括很大一部分建筑库存。最终，该项目将通过支持具有弹性性能的建筑的经济设计和建造来造福社会。本项目将开发的建筑物结构稳定性设计框架将侧重于在整个预期响应范围内提供持续的正刚度，以抵消P-Delta效应。虽然这个中心概念很简单——建筑的横向系统必须有足够的刚度来抵抗施加的横向载荷和重力载荷通过横向位移产生的不稳定效应——但它的简单掩盖了稳定性行为的复杂性，以及与不同需求和结构响应组合的稳定性设计相关的细微差别。目前的非地震情况下的稳定性设计框架是严格的，即结构有适度的超强，结构的极限强度发生在显著的非弹性变形之前，但其对力放大的关注并不能转化为显著的非弹性变形、超强和/或退化的地震情况。对刚度的一贯关注将统一建筑结构稳定性的处理，并提供一个连贯的理念，使设计创新和支持下一代建筑横向系统的发展。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This Boosting Research Ideas for Transformative and Equitable Advances in Engineering (BRITE) Synergy project will synthesize distinct threads of research on building structural stability to create a holistic framework for assessment and design that consistently applies fundamental principles across a broad range of real-world scenarios. These scenarios include: low-seismic where wind is most important and behavior is nominally elastic; moderate-seismic where behavior is often inelastic with low-ductility response and severe degradation; high-seismic where behavior is inelastic with high-ductility response. In all cases, whether response is static or dynamic, the essential cause of instability is the effect of gravity acting on the deformed system configuration. This project will coalesce the current research state-of-the-art and industry state-of-the-practice into a consistent view of stability behavior. The consideration of multiple loading conditions and hazards will encompass a large portion of the building stock in the United States. Ultimately, this project will benefit society by supporting economical design and construction of buildings with resilient performance.The framework for structural stability design of buildings that will be developed in this project will focus on providing persistent positive stiffness across the full range of expected response to counteract P-Delta effects. Although this central concept is simple – the lateral system of the building must have adequate stiffness to resist the applied lateral loads plus the destabilizing effects of gravity loads acting through lateral displacements – its simplicity belies the complexity of stability behavior and the nuances associated with stability design for diverse combinations of demand and structural response. The current stability design framework for non-seismic scenarios, where the structure has modest overstrength and the ultimate strength of the structure occurs prior to significant inelastic deformation, is rigorous, but its focus on force amplification does not translate to seismic scenarios where significant inelastic deformation, overstrength and/or degradation are expected. A consistent focus on stiffness will unify the treatment of building structural stability and provide a coherent philosophy that enables innovation in design and supports development of next-generation building lateral systems.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.