摘要
为研究不锈钢管和不锈钢管混凝土构件的局部承压性能,采用静力性能试验方法,对26个不同边界条件、加载条件和方式、支承板宽度和高厚比的中空不锈钢管试件及8个内灌混凝土的不锈钢管试件的腹板屈曲性能进行试验,考察了不锈钢管在端部和内部集中荷载作用下的破坏模式,给出了荷载—位移曲线以及局部承压区域应变强度分布曲线,分析了边界条件、加载条件、支承板宽度、高厚比和内灌混凝土对不锈钢管局部承压极限承载力和延性的影响。试验结果表明:支承板宽度的增大能显著提高中空不锈钢管局部受压极限承载力;其他条件相同时,腹板名义高厚比为50的中空不锈钢管试件局部受压极限承载力均明显高于腹板名义高厚比为75的试件;腹板名义高厚比为50的中空不锈钢管试件的延性均明显低于腹板名义高厚比为75的试件;其他条件相同时,中空不锈钢管内部一侧翼缘加载(IG)的局部受压极限承载力最高,内部两侧翼缘加载(ITF)的局部受压极限承载力次之,端部一侧翼缘加载(EG)和端部两侧翼缘加载(ETF)的局部受压极限承载力最低;内灌混凝土对不锈钢管局部受压极限承载力提高非常显著。
To research the mechanical behavior of stainless steel tubes under local axial compres-sion, twenty-six stainless steel tubes with different loadings, bearing length, height-to-thickness rati-os were tested. Eight stainless steel tubes that were filled with concrete to enhance the local load bearing strength were tested. Failure modes, load-end vertical displacement and strain intensity dis-tribution curves were presented. The effects of boundary conditions, loading conditions, bearing length, height-to-thickness ratio and filling concrete on the ultimate local load carrying capacity and the ductility of stainless steel tubes were also studied. It was found that, as the bearing length in-creases, the effect of bearing length on the ultimate local load carrying capacity of the tubes is more obvious. Under the same condition, the ultimate local load carrying capacity of the tube with the height-to-thickness ratio of 50 is all larger than that of the tube with the height-to-thickness ratio of 75,but the ductility of the tubes is just the opposite. The ultimate local load carrying capacity of the tubes under Interior-Ground（IG） loading, Interior-Two-Flange（ITF） loading, End-Ground（EG） loading and End-Two-Flange loading decreases successively. The effect of filling concrete on the ul-timate local load carrying capacity of stainless steel tubes is obvious.
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2016年第5期1330-1341,共12页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金资助项目(51278209
51478047)
长江大学工程技术学院科学发展基金资助项目(15j0402)
关键词
局部承压
力学性能
中空不锈钢管
内灌混凝土不锈钢管
极限承载力
local bearing
mechanical behavior
stainless steel hollow sections tubes
stainless steel composite sections tubes
ultimate carrying capacity
