Improved design procedures for slotted hidden gap HSS brace connections & I-shape flange connections & the use of electroslag welding for the fabrication of heavy steel structures

拟议的研究是针对提高知识，设计，制造和详细规定，在加拿大热轧钢连接及其对构件响应的影响加载。ADF集团和DPHV表示需要三个相关的研究项目：1）开槽隐藏间隙HSS支撑连接，2）电渣焊接连接和组合柱，3）I形截面的螺栓法兰板连接。第一个项目解决的情况下，在钢支撑框架的抗震设计中，支撑连接是至关重要的，以促进非弹性性能的横向承载系统。开槽隐藏间隙HSS支撑连接是HSS支撑的传统连接钢筋的经济和结构上有吸引力的替代方案。本项目的目标是通过非线性非弹性有限元分析、材料测试、连接测试和支撑/连接测试，为开槽隐藏间隙HSS支撑连接开发一个全面的设计方法和详细建议。**第二个项目涉及使用电渣焊连接重型构件。目的是研究窄间隙改进电渣焊用于制造与加劲肋和连续板的连接以及用于组合箱形柱角节点，包括对制造程序、材料性能和整体结构对载荷的响应的影响。研究涉及焊接工艺开发、材料测试和有限元建模。** 第三个项目包括对I形钢构件的块体剪切破坏规定和受拉翼缘断裂准则设计要求的适用性进行调查。目的是调查目前的设计程序的适用性块剪切破坏的翼缘的I形截面，并评估使用两个块剪切破坏和拉伸翼缘断裂准则在设计的I形构件端弯矩连接。研究包括数值分析和实验室测试。**

The proposed research is directed towards improving the state of knowledge, design, fabrication & detailing provisions in Canada of hot-rolled steel connections and their influence on member response to loading. The ADF Group & DPHV have expressed the need for three related research projects: 1) Slotted hidden gap HSS brace connections, 2) Electro-slag welded connections & built-up columns, and 3) Bolted flange plate connections of I-shape sections.**The 1st project addresses the situation in seismic design of steel braced frames where the brace connections are critical in terms of facilitating inelastic performance of the lateral load carrying system. The slotted hidden gap HSS brace connection is an economically and structurally attractive alternative to traditional connection reinforcements for HSS braces. The objective of this project is to develop an all-encompassing design method & detailing recommendations for the slotted hidden gap HSS brace connection by means of non-linear inelastic finite element analyses, materials testing, connection testing & brace / connection testing.**The 2nd project involves the use of electro-slag welding for connecting heavy members. The objectives are to investigate the use of narrow gap improved electro-slag welding for the fabrication of connections with stiffeners & continuity plates and for built-up box column corner joints, including the influence on fabrication procedures, material properties and overall structural response to loading. The research involves weld procedure development, materials testing & finite element modelling. **The 3rd project comprises an investigation of the applicability of the block shear failure provision and tension flange fracture criterion design requirement for steel I-shape members. The objective is to investigate the applicability of the current design procedure for block shear failure in the flanges of I-shaped sections, and to evaluate the use of both block shear failure & the tension flange fracture criterion in the design of I-shaped member end moment connections. The research involves both numerical analyses & laboratory testing.**