摘要
对3块钢板夹钢管组合板进行了抗弯试验,绘制了荷载–位移(P-δ)曲线,记录了加载失效过程图。基于假设的失效模型和能量原理,推导建立了组合板最大承载力公式,并将最大承载力理论值与试验值进行比较。对试验结果进行了模拟与验证,讨论了钢板厚度和钢管壁厚对最大承载力的影响,并将最大承载力理论值与模拟值进行对比分析。结果表明:钢管数量越多,承载力越大。变形失效时,主要有焊缝开裂、上钢板局部屈曲和芯层钢管局部压扁等现象。数值模拟可以较好地预测试验最大承载力和变形情况。推导的最大承载力公式可以较好地预测试验结果和模拟结果,具有较高的精度。当用钢量增加较少时,仅增加上钢板厚度对提升组合板最大承载力最为有效。当用钢量增加较多时,同时增加上下钢板厚度对提升组合板最大承载力最为有效。
Bending resistance experiment of 3 pieces of steel pipes sandwich panels were done,and the Load-displacement(P-δ) curves and failure process diagram were made. Based on the fictitious failure model and energy principle,the peak bearing capacity formula were derived with comparison between theoretical and experimental values. The experimental results were simulated and verified by numerical simulation,and further discusses the thickness of steel panels and steel pipes wall thickness influence on bearing capacity,comparing theoretical and experimental values. The results are as follows: the more the number of steel pipes,the bigger the bearing capacity. Weld cracking,up panel buckling and steel core layer local flattening happen at the process of deformation failure. Deformation and peak bearing capacity can be predicted by numerical simulation. The results of experiment of simulation can be predicted by peak bearing capacity formula,with a superior precision. When the amount of steel increases less,increasing the thickness of the up steel panel is the most effective way to enhance the bearing capacity. When the amount of steel increases more,increasing the thickness of the up and down steel panel is the most effective way to enhance the bearing capacity.
出处
《土木工程与管理学报》
北大核心
2018年第1期104-109,145,共7页
Journal of Civil Engineering and Management
基金
国家科技支撑计划(2014BAB15B01-02)
国家自然科学基金(51478469)
关键词
组合板
最大承载力
变形
数值模拟
优化
sandwich panel
peak bearing capacity
deformation
numerical simulation
optimization
