摘要
为深入分析带悬臂梁段嵌入式加强型节点抗震性能,以及节点构件参数变化对节点抗震性能的影响,对带悬臂梁段嵌入式加强型节点进行拟静力分析,计算结果可为该类型节点设计提供优化方案。分别改变节点的螺栓数目、悬臂梁段外伸翼缘厚度、外伸翼缘宽度以及悬臂梁长度4个主要构件参数,获取一系列节点有限元数值计算模型,通过计算分析节点的滞回性能、破坏形态、耗能能力、承载力、刚度退化及应力路径等,将各系列节点的数值计算结果进行对比,分析节点的螺栓数目、悬臂梁段外伸翼缘厚度、外伸翼缘宽度以及悬臂梁长度对节点力学性能的影响。分析结果表明:翼缘螺栓的数目对节点的力学性能影响较小,在等强设计法设计的节点基础上增加翼缘螺栓数目,对节点的力学性能无明显影响,而减少翼缘螺栓数目会降低节点的整体性,节点会提前发生失稳破坏,但节点的承载能力和刚度下降并不明显。增加外伸翼缘的厚度和悬臂梁段翼缘的宽度可以明显提高节点的耗能能力、承载力和刚度,但当外伸翼缘厚度和外伸翼缘宽度达到一定程度后,耗能能力提高不明显,承载力退化较快,节点在弹塑性阶段的刚度退化加快,节点破坏形态也发生改变,但应力集中现象得到缓解,当外伸翼缘宽度过宽时,节点的耗能能力反而开始降低。悬臂梁段的长度对节点的力学性能有一定影响,增加悬臂梁段长度可提高节点的滞回性能、承载能力和刚度,总体上提高效果没有改变外伸翼缘的宽度和厚度提高的效果明显。由于悬臂梁段外伸翼缘厚度和悬臂梁段翼缘宽度对节点的力学性能影响较大,节点设计时建议外伸翼缘厚度和宽度的选取通过截面控制,外伸梁截面面积与中间梁段翼缘的横截面积比值建议在1.10~1.29范围之内。适当增大悬臂梁段外伸翼缘的截面可明显提高节点的耗能能力、承载能力和刚度,但当悬臂梁段外伸翼缘的截面过大时,破坏形态会发生改变,力学性能略有提高,但会加快节点承载力和刚度的退化速度。
To study seismic performance of embedded and reinforced connection with cantilever beam,and the effect of change of component parameters on the seismic performance of connection.quasi-static analysis on the embedded and reinforced connection with cantilever beam was carried out,the calculation results can provide an optimized scheme for designing of this type of connection.By changing the number of bolts,the thickness and width of the extended flange,the length of the cantilever beam respectively,a series of finite element numerical calculation models of connections were set up.Failure mode,hysteretic behaviour,energy dissipation capacity,bearing capacity,stiffness degradation,and stress path are calculated and analyzed.Numerical calculation results of each series of connection are compared to analyze the effect of the number of bolts,the thickness and width of the extended flange,the length of the cantilever beam on mechanical properties of the connection.The analysis results show that the number of flange bolts has little effect on mechanical properties of the connection.Increasing the number of flange bolts on the basis of the connection designed by the equal strength design method has no obvious effect on the mechanical properties of the connection,while decreasing the number of flange bolts will reduce the integrity of the connection,and the connection will buckle in advance,but the bearing capacity and stiffness of the connection will not decrease significantly.Increasing the thickness of the extended flange and the width of the cantilever flange can significantly improve the energy dissipation capacity,bearing capacity and stiffness of the connection.However,when the thickness and width of the extended flange reach a certain degree,the energy dissipation capacity is not significantly improved,and the bearing capacity degrades rapidly.The stiffness degradation of the connection in the elastoplasticity stage is accelerated,and the failure of connection failure mode also changes,but the stress concentration is relieved.When the width of the extended flange is too wide,on the contrary,the energy consumption capacity of nodes begins to decrease.The length of the cantilever beam segment has a certain effect on the mechanical properties of the connection.Increasing the length of the cantilever beam can improve the hysteretic performance,bearing capacity and stiffness of the connection.On the whole,the effect on improvement is less obvious than that of changing the width and thickness of the extended flange.Because the thickness and width of the flange of the cantilever beam have a great effect on mechanical properties of the connection,it is recommended that the selection of the thickness and width of the extended flange are controlled by the section when the connection is designed,and the ratio of the cross-sectional area of the extended beam to the crosssectional area of the flange of the middle beam section is recommended to be within the range of 1.10~1.29.Properly increasing the section of the extended flange of the cantilever beam can significantly improve the energy dissipation capacity,bearing capacity and stiffness of the connection.However,when the section of the extended flange of the cantilever beam is too large,the failure mode will change,and the mechanical properties will be slightly improved,but the degradation rate of the bearing capacity and stiffness of the connection will be accelerated.
作者
韩明岚
时建华
史震海
王燕
Minglan Han;Jianhua Shi;Zhenhai Shi;Yan Wang(School of Science,Qingdao University of Technology,Qingdao 266033,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China)
出处
《钢结构（中英文）》
2023年第1期1-12,共12页
Steel Construction（Chinese & English）
基金
国家自然科学基金面上资助项目(52078258)
关键词
钢结构
带悬臂梁段节点
拟静力分析
抗震性能
有限元分析
steel structure
connection with cantilever beam
pseudo-static analysis
seismic performance
finite analysis
