The increasingly common case of weak-axis end moments - - eliminating unnecessary joint stiffeners

弱轴端力矩的情况日益常见 - - 消除不必要的接头加劲肋

• 批准号: 490510-2015
• 负责人: Driver, Robert
• 金额: $ 1.65万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=601438
• 关键词: increasingly; common; case; weak; axis

Industrial structures are most commonly designed using structural steel to take advantage of its versatility, adaptability, and ductility under complex and often ill-defined loading conditions. In order to cover a variety of load cases that could arise during the life of the structure due to wind, design hydraulic events, machine operation, and potential future repurposing, in addition to other loading scenarios common in industrial sectors, design engineers are increasingly adding more complex combined loading cases to the design documents, creating substantial added costs to the fabrication of the structure. This situation could arise as a result of combined vertical and horizontal loads in addition to strong- and weak-axis moments being specified at beam-to-column connections that in truth would not occur concurrently. Even where they do occur concurrently, the loads normally assume a perfectly rigid connection node, whereas flexibilities that are inherent to the surrounding structure actually tend to relieve the applied connection forces. Identifying these cases with confidence, and accordingly accounting for the true structural behaviour in this region would, in turn, result in a significant cost reduction for the structure. The proposed research project will investigate the mechanics of the overall joint and frame behaviour in order to develop a generalised approach to design for complex load combinations, with emphasis on weak-axis moments, to permit the elimination of stiffeners where justified, and in turn reduce costs.

工业结构最常使用结构钢进行设计，以在复杂且通常不明确的载荷条件下利用其多功能性、适应性和延展性。为了涵盖结构寿命期间由于风、设计液压事件、机器操作和潜在的未来重新利用而可能出现的各种载荷情况，除了工业领域常见的其他载荷场景之外，设计工程师越来越多地添加设计文件中的组合载荷工况更加复杂，从而大大增加了结构的制造成本。这种情况可能是由于组合的垂直和水平荷载以及在梁柱连接处指定的强轴力矩和弱轴力矩而出现的，而实际上不会同时发生。即使它们确实同时发生，载荷通常也会呈现出完全刚性的连接节点，而周围结构固有的灵活性实际上往往会减轻所施加的连接力。自信地识别这些情况，并相应地解释该区域的真实结构行为，反过来将导致结构成本的显着降低。拟议的研究项目将研究整体接头和框架行为的力学，以便开发一种通用的方法来设计复杂的载荷组合，重点是弱轴力矩，以允许在合理的情况下消除加强筋，从而减少成本。