Collabortive Research: Strengthening of Nonductile Moment Resisting Frames

二十多年前建造的非延性钢筋混凝土抗弯矩框架已被确定为现有建筑清单中与减轻危害相关的最紧迫问题之一。在过去的六年中，对钢筋混凝土框架的各种修复和加强技术进行了研究，包括增加结构墙，护套或扩大柱和/或梁，以及增加钢支撑。这个研究项目扩展了以前在德克萨斯大学进行的工作。该程序包括框架测试以及对非延性抗弯矩框架加强程序的关键细节的测试。项目主要分为两大任务：(1)非延性框架加墙相关问题，包括柱拼接性能改善、墙体顶部界面缺陷研究、界面剪切传递试验（轴向载荷和榫槽影响）、框架加墙试验；(2)在钢筋混凝土框架上增加钢支撑系统，包括连续性连接的细节，具有高长细比支撑的系统，以及具有低长细比支撑的系统。这是德克萨斯大学奥斯汀分校和H. J. Degenkolb Associates的合作研究项目。本研究项目由H. J. Degenkolb Associates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. This 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 H. J. Degenkolb Associates.