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Seismic rehabilitation performance of steel side plate moment connections

机译:钢制侧板弯矩连接件的抗震性能

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Moment connections in an existing steel building located in Kaohsiung, Taiwan were rehabilitated to satisfy seismic requirements based on the 2005 AISC seismic provisions. Construction of the building was ceased in 1996 due to financial difficulties and was recommenced in 2007 with enhanced connection performance. Steel moment connections in the existing building were constructed by groove welding the beam flanges and bolting the beam web to the column. Four moment connections, two from the existing steel building, were cyclically tested. A non-rehabilitated moment connection with bolted web-welded flanges was tested as a benchmark. Three moment connections rehabilitated by welding full-depth side plates between the column face and beam flange inner side were tested to validate the rehabilitation performance. Test results revealed that (1) the non-rehabilitated existing moment connection made by in situ welding process prior to 1996 had similar deformation capacity as contemporary connection specimens made by laboratory welding process, (2) all rehabilitated moment connections exhibited excellent performance, exceeding a 4% drift without fractures of beam flange groove-welded joints, and (3) presence of the full-depth side plates effectively reduced beam flange tensile strain near the column face by almost half compared with the non-rehabilitated moment connection. The connection specimens were also modeled using the non-linear finite element computer program ABAQUS to further confirm the effectiveness of the side plate in transferring beam moments to the column and to investigate potential sources of connection failure. A design procedure was made based on experimental and analytical studies.
机译:根据2005 AISC地震规定,对位于台湾高雄的现有钢结构建筑物中的弯矩连接进行了修复,以满足地震要求。由于经济困难,该建筑于1996年停止建造,并于2007年因连接性能提高而重新开始建造。通过对梁的法兰进行坡口焊接并将梁腹板螺栓连接到柱上,可以构建现有建筑物中的钢力矩连接。循环测试了四个力矩连接,其中两个来自现有的钢结构。带有螺栓腹板焊接法兰的非修复力矩连接已作为基准进行了测试。测试了通过在柱面和梁翼缘内侧之间焊接全深度侧板进行修复的三矩连接,以验证修复性能。测试结果表明:(1)1996年之前通过原位焊接工艺制成的未修复的现有弯矩连接件的变形能力与通过实验室焊接工艺制成的当代连接标本具有相似的变形能力;(2)所有已修复的力矩连接均表现出优异的性能,超过了4%的漂移没有梁法兰槽焊接接头的断裂,(3)全深度侧板的存在与未修复的力矩连接相比,可有效地将柱面附近的梁法兰拉伸应变降低了近一半。还使用非线性有限元计算机程序ABAQUS对连接样本进行建模,以进一步确认侧板在将梁弯矩传递给柱子方面的有效性,并研究连接失败的潜在根源。根据实验和分析研究制定了设计程序。

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