梁翼缘圆弧扩大头和圆孔削弱型内隔板式箱形柱-H型钢梁节点低周往复循环加载试验*
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(1 宁波大学建筑工程与环境学院， 宁波 315211； 2 浙江省二建钢结构有限公司， 宁波 315207)［摘要］对1个常规内隔板式箱形柱-H型钢梁节点和3个梁翼缘圆弧扩大头和圆孔削弱型内隔板式箱形柱-H型钢梁节点进行了低周往复循环加载试验，试验结果表明，常规节点在梁翼缘对接焊缝处脆性断裂，节点塑性转角达不到FEMA 要求的0.03rad。当柱内隔板与柱壁板间焊缝质量较好时，梁翼缘圆弧扩大头和圆孔削弱型节点的塑性转角可达0.03rad，承载力较常规节点提高约70%。圆弧扩大头构造显著降低了梁翼缘对接焊缝的应力集中程度，避免了对接焊缝脆断，圆孔构造促使梁削弱截面形成塑性铰。当内隔板与柱壁板焊缝质量较差时，箱形柱壁板间焊缝过早撕裂，导致内隔板式箱形柱-H型钢梁节点的延性和承载力明显降低。［关键词］箱形柱-H型钢梁节点; 循环加载试验; 扩大头; 圆孔削弱; 塑性转角; 承载力中图分类号：TU391 文献标识码：A 文章编号：1002-848X(2013)21-0014-04Low-cycle reversed loading tests on inner diaphragm joints of H-style steel beam-square steel tubular column with circular enlarged juncture near butt weld and opening holes at beam flangesXie Guangjie1, Wang Wanzhen1, Zhao Yinhai2, Chen Feiyi1(1 Faculty of Architectural Civil Engineering and Environment, Ningbo University, Ningbo 315211, China; 2 Zhejiang Provincial Erjian Steel Structure Co., Ltd., Ningbo 315207, China)Abstract: Low-cycle reversed loading tests were performed on inner diaphragm joints of H-style steel beam-square steel tubular column, including one conventional joint and three joints with circular enlarged juncture near butt weld and opening holes at beam flanges. The test results show that, for the conventional joint, butt weld at beam flange appears brittle fracture and the plastic rotation can not meet with the requirement 0.03rad in the FEMA interim guidelines. For the joints with quality welding between stiffened ribs and column walls, the plastic rotation of joints with circular enlarged juncture near butt weld and opening holes at beam flanges achieves 0.03rad and the loading capacity increases by 70% compared with that of the conventional joint. The stress concentration at butt weld is remarkably mitigated by using circular enlarged juncture. A plastic hinge is formed at the reduced beam section due to the opening holes at beam flanges. For the joints with poor welding between stiffened ribs and column walls, rupture is observed at the weld between the column walls, and the ductility and the bearing capacity of these joints reduce remarkably.Keywords: H-style steel beam-square steel tubular column joint; low-cycle reversed loading test; enlarged juncture; opening hole; plastic rotation; loading capacity*浙江省自然科学基金(LY12E08008)，浙江省公益性技术应用研究计划（2013C31058），浙江省“新世纪151人才工程”项目（11-3-079），宁波市自然科学基金（2013A610192）。通讯作者：王万祯，博士，副教授，Email: wangwanzhen1975@sina.com。参考文献［1］MIRGHADERI S R, TORABIAN S, KESHAVARZI F. I-beam to box-column connection by a vertical plate passing through the column ［J］. Engineering Structures, 2010, 32(8): 2034-2048.［2］GOSWAMI R, MURTY C R. Externally reinforced welded I-beam-to-box-column seismic connection ［J］. Journal of Engineering Mechanics, 2010,136(1):23-30.［3］KIM T, STOJADINOVIC B, WHITTAKE A S. Seismic performance of pre-Northridge welded steel moment connections to built-up box columns ［J］. Journal of Structural Engineering, 2008, 134(2): 289-299.［4］KIM Y, OH S H. Effect of moment transfer efficiency of a beam web on deformation capacity at box column-to-H beam connections ［J］. Journal of Constructional Steel Research, 2007, 63（1）: 24-36.［5］陈以一，李刚，庄磊，等. H型钢梁与钢管柱隔板贯通式连接节点抗震性能试验［J］. 建筑钢结构进展，2006，8(1): 23-30.［6］刘洪波，谢礼立，邵永松. 钢结构箱形柱与工字梁刚性节点有限元分析 ［J］. 哈尔滨工业大学学报，2007，39(8): 1211-1215.［7］林克强，庄胜智，张福全，等.典型钢梁与箱型柱采用梁翼切削或梁翼加盖板抗弯接头的破坏模式［J］. 建筑钢结构进展，2010，12(2)：1-12.［8］蔡飞. 钢框架箱形柱与工字型梁刚性连接节点的抗震性能分析［D］. 南昌：南昌大学，2005.［9］FEMA-267 Interim guidelines: evaluation, repair, modification and design of steel soment frames ［R］. California: SAC-95-02, SAC Joint Venture, 1995.［10］FEMA-267 No.2 Interim guidelines advisory, supplement to FEMA-267 ［R］. California: SAC-990-1, SAC-Joint Venture, 1999.
