摘要
针对传统部分包覆组合柱(PEC柱)中腹板易变形屈曲,以及与混凝土协同作用较弱、易分离等问题,提出一种将腹板形式由平钢板改为波形钢板的波形腹板PEC柱。考虑强弱轴方向、波形腹板方向、横向系杆间距、偏心距4个关键因素,设计10个波形腹板PEC柱试件并进行偏心加载试验。试验结果表明:波形腹板PEC柱试件在偏心受压下的破坏形态基本一致,均表现为受压侧翼缘鼓曲变形和混凝土压碎失效。试件在强轴方向的承载力较弱轴方向的承载力最大增幅为61.20%,延性最大增幅为63.06%;竖向波形腹板试件的承载力和初始刚度均高于横向波形腹板试件的相应值;较小偏心受压试件的承载力高于较大偏心受压试件的承载力;减小横向系杆间距,试件达到峰值荷载后的延性性能提高,最大增幅为75.16%。通过有限元软件ABAQUS建立波形腹板PEC柱偏心受压模型,在与试验结果进行对比验证的基础上,结合已有PEC柱试件的相关规范,拟合得到竖向波形腹板PEC柱压弯承载力计算公式,且理论值与试验值的差异在10%以内。
In order to solve the problems of traditional partially encased composite columns(PEC columns),including easy deformation and buckling of webs,weak synergistic effect with concrete,and easy separation,corrugated web PEC column with corrugated steel plate instead of flat steel plate was proposed.Considering four key factors:strong and weak axis direction,corrugated web direction,transverse tie bar spacing and eccentricity,ten corrugated web PEC column specimens were designed,and eccentric loading experiments were carried out.The test results show that the failure modes of PEC columns with corrugated webs under eccentric compression are the same,manifested as bulging deformation of compression side flange and crushing failure of concrete.Compared to the specimen around weak axis,the bearing capacity and ductility of the specimen around strong axis can be increased by 61.20%and 63.06%at most,respectively;the bearing capacity and initial stiffness of vertical corrugated web specimens are higher than those of transverse corrugated web specimens;the bearing capacity of the specimen with smaller eccentricity is higher than that of the specimen with larger eccentricity;by reducing the spacing of transverse tie bars,the ductility of the specimen can be improved by 75.16%at most after reaching the peak load.The eccentric compression model of the corrugated web PEC column was established by ABAQUS finite element software.The formula for calculating the eccentric bearing capacity of vertical corrugated web PEC column is fitted based on comparing the test results and combining the existing relevant specifications for PEC column.The difference between the theoretical and experimental value is within 10%.
作者
王威
包海洋
白淙尤
刘磊
陈乐乐
WANG Wei;BAO Haiyang;BAI Congyou;LIU Lei;CHEN Lele(College of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)
出处
《建筑钢结构进展》
CSCD
北大核心
2024年第12期1-11,共11页
Progress in Steel Building Structures
基金
国家自然科学基金(52278214、52378314)
陕西省自然科学基础研究计划重点项目(2022JZ-21)
西部装配式建筑工业化协同创新中心科学研究计划项目(N202203)
秦创原创新驱动平台-未来城市建设与管理创新联合研究中心科研项目(YJZX20210008)
陕西省杰出青年科学基金项目(2018JC-025)。
关键词
波形腹板
部分包覆组合柱
偏心受压试验
有限元模拟
压弯承载力
corrugated web
PEC column
eccentric compression test
finite element simulation
eccentric bearing capacity
