摘要
震后可恢复功能的关键是保证震后节点的主要部件不发生塑性变形,只需要更换局部构件即可恢复节点的受力性能。基于此,提出了一种新型的可恢复功能装配式钢结构开洞槽钢梁柱节点,节点通过翼缘盖板连接悬臂梁段和开洞槽钢组合梁段,在对悬臂梁段加强的同时将翼缘盖板进行了狗骨式削弱处理,将塑性铰转移到可更换的翼缘盖板上。对5个不同参数的节点算例进行了有限元模拟,主要考察了翼缘盖板厚度、中间螺栓间距、狗骨削弱段宽度和单侧螺栓数量等参数变化对节点受力性能和可恢复功能的影响,获得了各节点算例的荷载-位移曲线、节点破坏模式、相对滑移曲线、应力曲线等。研究结果表明:这种新型的可恢复功能装配式钢结构开洞槽钢节点具有良好的承载能力,能够实现震后可恢复功能要求;翼缘盖板狗骨式设计可很好地实现节点损伤控制;翼缘盖板的厚度主要影响节点的屈服荷载及峰值承载力;翼缘盖板中间螺栓间距大小不会影响节点的屈服荷载,但会影响节点的峰值承载力。
The key to the earthquake-resilience is to ensure that the main components of the joint do not undergo plastic deformation,so after earthquake,the joint function can be restored by replacing the replaceable members. On that basis,a new type of joint called earthquake-resilient prefabricated opening-web channel beam-column joint was proposed. The cantilever beam and the opening-web channel beam were connected by flange cover plates and web connecting plates. The flange of the cantilever beam was strengthened and the flange cover plates were weakened like dog bone,so the plastic hinge could be transferred to the flange cover plates effectively. A total of 5 different numerical examples were designed for finite element analysis,mainly to investigate the influence of the thickness of the flange cover plates,the middle bolts interval,the width of dog bone weakening section and the number of bolts on the mechanical properties and earthquake-resilience of joints. The load-displacement curve,failure modes of joints,relative slip curve,stress curves were analyzed in detail. The results showed that this new type of joint had good bearing capacity and could meet the requirements of earthquake-resilience. The dog bone weakening of flange cover plates could realize the damage control effectively. The thickness of flange cover plates mainly affected the yield load and peak load of the joint. However,the middle bolts interval would affect the peak load of the joint,not the yield load.
作者
张爱林
程魁魁
姜子钦
韦石兰
申存杰
ZHANG Ailin;CHENG Kuikui;JIANG Ziqin;WEI Shilan;SHEN Cunjie(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;Beijing Engineering Research Center of High-Rise and Large-Span Prestressed Steel Structure,Beijing University of Technology,Beijing 100124,China;Beijing Advanced Innovation Center for Future City Design,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)
出处
《工业建筑》
CSCD
北大核心
2020年第3期29-35,共7页
Industrial Construction
基金
国家自然科学基金项目(51608014)
中国博士后科学基金项目(2017T100020)。
关键词
可恢复功能
梁柱节点
狗骨削弱截面
开洞槽钢组合梁
有限元分析
earthquake-resilience
beam-column joint
dog bone weakening section
opening-web channel beam
finite element analysis
