Collaborative Research: Strengthening of Nonductile Moment Resisting Frames

20多年前建造的非延性钢筋混凝土抗弯框架已被认为是现有建筑库存中与减轻危险相关的最紧迫的问题之一。在过去的六年里，人们研究了各种钢筋混凝土框架的修复和加固技术，包括增加结构墙、套装或加大柱和/或梁，以及增加钢支撑。这项研究计划扩展了德克萨斯大学之前进行的工作。该计划包括框架试验以及关于非延性抗弯框架加固程序关键细节的试验。该项目分为两个主要任务：(1)在非延性框架中增加结构墙的相关问题，包括柱拼接性能的改善，墙顶界面缺陷的研究，界面剪力传递试验(轴向荷载和销钉的影响)，以及填充墙框架试验；以及(2)在钢筋混凝土框架中增加钢支撑系统，包括为保持连续性而对连接进行细部处理，具有高长细比的支撑系统，以及具有低长细比的支撑系统。这是得克萨斯大学奥斯汀分校和德根科尔布联合公司的合作研究项目。该研究项目由德克萨斯大学参与。

Nonductile reinforced concrete moment-resisting frames constructed twenty or more years ago have been indentified as one of the most pressing problems associated with mitigating hazards in the existing building inventory. During the past six years a variety of repair and strengthening techniques for reinforced concrete frames have been investigated and includes addition of structural walls, jacketing or enlarging columns and/or beams, and addition of steel bracing. This research program extends previous work conducted at the University of Texas. The program consists of frame tests as well as tests on critical details of strengthening procedures for nonductile moment-resisting frames. The project is divided into two major tasks: (1) Problems associated with addition of structural walls to nonductile frames, including improvement of column splice performance, study of interface flaws at top of wall, interface shear transfer tests (influence of axial load and dowels), and frame tests with infill walls; and (2) Addition of steel bracing systems to reinforced concrete frames including detailing of connections for continuity, systems with braces having high slenderness ratios, and systems with braces having low slenderness ratios. This is a collaborative research project between the University of Texas at Austin and H. J. Degenkolb Associates. This research project represents the participation by the University of Texas.