火灾后加劲型方钢管混凝土柱轴压力学性能研究  

Study on Axial Compression Performance of Stiffened Concrete-Filled Square Steel Tube Columns after Fire

作　　者：李学锋[1] 王慧峰 刘振辉 LI Xuefeng;WANG Huifeng;LIU Zhenhui(School of Management,Shenyang Jianzhu University,Shenyang,China,110168;Liaoning Construction Science Research Institute Limited,Shenyang,China,110005)

机构地区：[1]沈阳建筑大学管理学院,辽宁沈阳110168 [2]辽宁省建设科学研究院有限责任公司,辽宁沈阳110005

出　　处：《沈阳建筑大学学报（自然科学版）》2021年第4期642-649,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(52078310)。

摘　　要：目的对火灾后加劲型钢管混凝土柱轴压性能及受力全过程工作机理进行研究。方法通过借助相关文献中的试验进行有限元模型验证后,利用有限元软件ABAQUS对试件变形形态进行分析,研究受火时间、加劲肋厚度以及钢材屈服强度对试件承载力的影响。结果常温下普通钢管混凝土柱以及火灾前后加劲型钢管混凝土柱在轴向荷载作用下均表现为中部鼓曲,且加劲肋出现局部屈曲;受力全过程中试件混凝土荷载分担比经历了先增大后减小的过程,荷载分担比最大为40.11%;通过参数分析发现,当采用ISO-834标准升温曲线对试件进行升温处理后,试件承载力显著降低;改变加劲肋厚度以及钢材强度对试件承载力影响相对较小。结论加劲肋的存在能有效提高试件的承载能力,经历火灾后的加劲型钢管混凝土柱仍具有足够的安全储备空间。To study the axial compression performance and the working mechanism of the whole process of the stiffened concrete-filled steel tube column afterward firing.After the finite element verification with the help of the test in the related references,the finite element software ABAQUS is used to analyze the deformation of the tested piece,at the same time,the effects of fire time,stiffener thickness and steel yield strength on the bearing capacity of the tested pieces were studied.The normal temperature of ordinary steel tube concrete columns and the stiffened steel tube concrete columns before and after fire showed central bulge under axial load,and the stiffeners appeared partial buckling,the concrete load-bearing ratio of the tested pieces has experienced a process of increasing at first and then decreasing during the whole stress process,and the maximum load-bearing ratio is 40.11%;Through parameter analysis,when the ISO-834 standard heating curve is used to treat the tested pieces,the bearing capacity of the tested pieces is significantly decreased,and the influence of changing the thickness of the stiffener and the strength of the steel on the bearing capacity of the tested pieces is relatively small.The existence of stiffeners can effectively improve the load-bearing capacity of the tested pieces,the stiffened steel tube concrete column after fire still has enough safety capacity.

关 键 词：火灾 加劲型钢管混凝土柱 轴压性能 有限元 

分 类 号：TU391[建筑科学—结构工程]