屈曲约束翼缘盖板连接的钢框架节点滞回性能研究  

Study on hysteretic behavior of steel frame joints connected with buckling-restrained flange cover plates

作　　者：冯玉龙 韦明途 种迅[1] 蒋庆[1] FENG Yulong;WEI Mingtu;CHONG Xun;JIANG Qing(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学土木与水利工程学院,合肥230009

出　　处：《建筑结构》2023年第5期110-118,共9页Building Structure

基　　金：国家自然科学基金项目(51708166);中央高校基本科研业务费专项资金资助(JZ2019HGTB0086);中国博士后科学基金资助项目(2018M630706)。

摘　　要：为提升钢框架节点抗震性能,实现塑性铰转移、损伤集中和损伤构件的可更换,针对带悬臂梁段拼接节点,提出了一种屈曲约束翼缘盖板连接的钢框架节点。对7个系列共14个节点进行了数值模拟分析,对比了不同类型节点的性能差异并研究了关键设计参数对节点滞回性能的影响规律。结果表明,节点塑性变形集中在可更换的屈曲约束翼缘盖板上,滞回较为饱满且稳定;翼缘盖板与翼缘面积比增加时,节点承载力增加,但比值超过约1/2时,梁柱可能出现损伤,难以实现损伤集中的设计目标;梁段间隙过大,翼缘盖板可能发生局部屈曲,建议控制其厚度与梁段间隙比值不低于1/5;约束板约束范围达到50%时,即能有效约束翼缘盖板;增加翼缘盖板削弱段长度,使梁段间隙偏心率在0~0.25区间时,节点滞回曲线变化不大,翼缘盖板损伤减小;当螺栓数量较少时,翼缘盖板在屈服耗能前会产生滑移,进而影响节点滞回性能;腹板近翼缘侧螺栓孔由圆形改为槽形时,可以改善腹板螺栓孔处应力状况。To improve the seismic performance of steel frame joints and realize the transfer of plastic hinge,concentrated damage and replacement of damaged members,a kind of steel frame joint with buckling-restrained flange cover plates was proposed.A total of 14 joints in 7 series were numerically simulated.The performance differences between various types of joints were compared,and the influence of key design parameters on the hysteretic performance of the joints was studied.The results show that the plastic deformation of the joint proposed is concentrated on the replaceable buckling-restrained flange cover plate,and it exhibits a full and stable hysteretic performance.When the area ratio between the flange cover plate and the flange increases,the bearing capacity of the joints increases;however,the beam and column may damage,making it difficult to achieve centralized damage when the ratio exceeds about 1/2.If the gap between beam segments is too large,a local buckling may occur to the cover plate;and it is recommended to control the ratio of thickness of cover plate to the gap at least 1/5.The flange cover plate can be effectively restrained when the range of the restraining plate reaches 50%.When the eccentricity ratio of the gap is between 0 and 0.25 with increasing weakened segment length of the flange cover plate,the hysteretic curves of the joints change slightly,and the damage of the cover plates decreases.When the number of bolts is small,the cover plate will slide before yield,which will affect the hysteretic performance of the joint.When the bolt holes of the web flange near the flanges are changed from circular to grooved,the stress situation at the bolt holes of the web can be improved.

关 键 词：屈曲约束翼缘盖板 钢框架节点 数值模拟 滞回性能 损伤集中 参数化分析 

分 类 号：TU391[建筑科学—结构工程]