摘要
为使高烈度区箱形柱设计更为安全、经济合理,根据支承大跨度屋盖钢柱的受力特点,提出一种上部壁厚小、下部壁厚大的变壁厚箱形柱,其截面外形尺寸、抗侧刚度均与等厚箱形柱保持一致,并给出了相应的设计方法。为研究变壁厚箱形柱的受力性能,进行了往复荷载作用下缩尺模型的压弯试验与有限元分析,分析了构件壁厚、上柱高度比和轴压比等参数的影响。试验与有限元分析结果表明:变壁厚箱形柱符合悬臂柱的受力特点,具有良好的抗震性能;变壁厚箱形柱压弯承载力和稳定承载力计算公式与模型试验、有限元分析吻合较好,可以用于变壁厚箱形柱设计;变壁厚箱形柱用钢量明显低于等厚箱形柱,当上柱高度与柱总度之比为0.4左右时,可节约钢材11.7%~16.2%;对于宽厚比满足限值要求、轴压比不大于0.3的箱形柱,变壁厚箱形柱节约钢材的效果较好,具有良好的技术经济性能。
In order to make the design of box-section columns in strong earthquake regions safer,more economical and reasonable,based on the feature of steel columns supporting large-span roof structure,a stepped thickness box(STB)column with small upper wall thickness and large lower wall thickness was proposed.The cross-section dimensions and lateral stiffness were kept the same as those of box columns with the constant thickness,and corresponding design methods were given.In order to study the mechanical properties of STB columns,the compression-bending scaled model test under reciprocating loading and finite element analysis were carried out.The effects of parameters such as wall thickness,upper column height ratio and axial compression ratio of the STB columns were studied comprehensively.The test and numerical analysis results show that the STB columns meet the mechanical characteristics of the cantilever column and have good seismic performance.The calculation formulas for the compression-bending bearing capacity and stable bearing capacity of STB columns are in good agreement with the test and finite element analysis results,and can be used for the design of STB columns.The amount of steel for STB columns is significantly lower than that of equal thickness box-section columns,steel can be saved by 11.7%to 16.2%when the upper column height ratio is about 0.4.For box-section columns with a width-to-thickness ratio meeting the limit requirements and an axial compression ratio no larger than 0.3,the effect of steel saving is better and the STB columns show good mechanical and economic performance.
作者
范重
陈宇辰
柴会娟
张相勇
张朝
夏远哲
沈平
薄广达
FAN Zhong;CHEN Yuchen;CHAI Huijuan;ZHANG Xiangyong;ZHANG Zhao;XIA Yuanzhe;SHEN Ping;BO Guangda(China Architecture Design&Research Institute,Beijing 100044,China;Central Research Institute of Building and Construction of MCC Group,Beijing 100088,China;China Construction Science and Industry Corporation Ltd,Shenzhen 518040,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2020年第S02期202-212,共11页
Journal of Building Structures
基金
“十三五”国家重点研发计划(2016YFC0701201)
中国建设科技集团科技创新基金项目(Z2016J05)
关键词
变壁厚箱形柱
上柱高度比
轴压比
拟静力试验
有限元分析
承载力
抗震性能
stepped thickness box column
upper column height ratio
axial compression ratio
quasi-static test
finite element analysis
bearing capacity
seismic performance
