端板连接蜂窝梁平面钢框架抗连续性倒塌动力性能研究  

The Study on the Dynamic Performance of Planar Steel Frames with Castellated Beams Connected by End-Plates against Continuous Collapse

作　　者：杨恩光 陈勇[2] 贾连光[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁 沈阳 [2]中国建筑东北设计研究院有限公司,辽宁 沈阳

出　　处：《土木工程》2024年第4期531-542,共12页Hans Journal of Civil Engineering

摘　　要：为研究端板连接蜂窝梁平面钢框架抗连续性倒塌的动力性能,本文采用拆除构件法研究中柱失效下的端板连接蜂窝梁平面钢框架的抗连续性倒塌动力性能分析,并研究不同端板厚度、开孔率、首孔距离及孔形等参数对其抗连续性倒塌动力性能的影响。结果表明:中柱失效后,随失效柱的位移增加,蜂窝梁首孔处逐渐形成塑性铰,结构内传力路径重分布,使其重新维持稳定,并未发生连续倒塌。失效点极限竖向位移为419.1 mm,失效柱第三层极限水平位移为25.7 mm。端板厚度对其抗连续性倒塌性能影响较大,端板厚度为6 mm时,失效柱两侧蜂窝梁极限竖向转角达到7.34˚,结构发生连续性倒塌,建议端板厚度为10~14 mm之间。开孔率和首孔距离对连续倒塌性能影响较小,开孔率对其极限位移影响为正相关,推荐开孔率在50%~70%之间,首孔距离对其极限位移影响为正相关,推荐首孔距离在0.5~1.5 h之间。正六边形孔端板连接蜂窝梁平面钢框架相较圆孔形会更加稳定。基于位移法,提出适合端板连接蜂窝梁平面钢框架结构的动力放大系数为1.2。In order to study the dynamic performance of the planar steel frame with castellated beams connected by end-plates against continuous collapse, this paper uses the component disassembly method to study the dynamic performance analysis of the planar steel frame with castellated beams connected by end-plates under the failure of the central column, and studies the influence of parameters such as plate thickness, opening ratio, first hole distance and hole shape on its dynamic performance against continuous collapse. The results show that after the central column fails, as the displacement of the failed column increases, plastic hinges gradually form at the first hole of the castellated beam, and the force transmission path within the structure is redistributed, allowing it to regain stability without continuous collapse. The ultimate vertical displacement of the failure point is 419.1 mm, and the ultimate horizontal displacement of the third layer of the failed column is 25.7 mm. The thickness of the end-plate has a great influence on its resistance to continuous collapse. When the end-plate thickness is 6mm, the ultimate vertical rotation angle of the castellated beams on both sides of the failed column reaches 7.34˚, and the structure undergoes continuous collapse. It is recommended that the end-plate thickness be between 10~14 mm. The opening ratio and first hole distance have little impact on the continuous collapse performance. The opening ratio has a positive correlation with its ultimate displacement. It is recommended that the opening ratio be between 50%~70%. The first hole distance has a positive correlation with its ultimate displacement. , the recommended first hole distance is between 0.5~1.5 h. The regular hexagonal hole end-plate connected to the castellated beam flat steel frame is more stable than the round hole shape. Based on the displacement method, it is proposed that the dynamic amplification factor suitable for end-plate connected castellated beam planar steel frame structures is 1.2.

关 键 词：蜂窝梁平面钢框架 端板连接 连续倒塌 动力性能研究 动力放大系 

分 类 号：TU3[建筑科学—结构工程]