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夹芯板的冷弯薄壁型钢面层板在泡沫芯层支承下的屈曲性能研究

发布时间:2016-1-18 10:34:36 浏览次数:935

阐述了有关冷弯成型、网络、数据库的相关概念和发展,利用Asp建立基于客户端和服务器端的网络编程模式,利用SQLServer建立了冷弯型钢孔型设计经验数据专家知识库、存放轧辊图纸的轧辊图库和供存放数值模拟结果的数据模拟库.对冷弯薄壁型钢压型表面夹芯板受压面层板在泡沫芯层支承下的屈曲性能进行了理论分析和试验研究。
主要包括:
(1)在假定面层与芯层材料均为线弹性材料、变形处在小变形范围内、面层与芯层之间的接触面没有相对滑动等基础上,并考虑了芯层剪切刚度的影响,推导了夹芯板弯曲内力、变形及正应力的计算公式;
(2)沿夹芯板纵向将面层划分成有限条,较弱的芯层构造有限棱,这样,将夹芯板构造成有限条―棱模型,计算夹芯板的冷弯薄壁型钢受压面层板在泡沫芯层支承下的屈曲临界应力、屈曲荷载及屈曲半波长;
(3)将芯层视为无限弹性半空间,将薄壁金属单板视为支承在其上的四边简支板,利用能量法得到的屈曲临界应力公式,当用来计算夹芯板压型钢板受压上翼缘板的屈曲应力时,需要乘以修正系数以考虑压型钢板腹板和下翼缘板以及受拉面层的作用,从而得到夹芯板受压面层板屈曲临界应力的实用计算公式;
(4)用根据能量法求得的泡沫芯层支承下的薄壁金属单板的屈曲系数k,代替Winter有效宽度公式中的屈曲系数,可以作为压型表面夹芯板受压面层板屈曲后性能的计算方法;
(5)完成了6个压型表面夹芯板试件的弯曲屈曲承载力试验,测得了夹芯板受压面层板屈曲时的临界应力、屈曲荷载及屈曲半波长,理论值与试验值吻合较好。  


Theoretical analysis and experimental study on the buckling behavior of cold formed thin walled steel sandwich plate under the support of the foam core layer.
Mainly include:
(1) was derived under the assumption that the surface layer and the core layer material is linear elastic material, the distortion in a small range of deformation, the surface layer and the core layer between the contact surface without relative slip based on, and consider the effect of core layer shear stiffness of the sandwich plate bending internal force, deformation and force calculation formula of normal stress;
(2) along the sandwich panel vertically surface layer is divided into finite strip, weak core layer structure finite edge. This will sandwich panel structure caused by finite strip - edge model, sandwich panels of cold-formed steel compression surface layer in the foam core layer bearing calculation of buckling critical force, buckling loads and buckling half wavelength;
(3) will be the core layer as elastic semi infinite space, regarded single thin-wall metal plate for supporting the plate with all edges simply supported, obtained by the energy method of buckling critical force formula, when used to calculate the sandwich plate pressure plate type compression flange buckling stress need to be multiplied by correction factor to take into account the pressure type steel web and bottom flange and ramen layer, in order to get the sandwich panel is to be pressed surface plate buckling critical force calculation formula;
(4) with according to the energy method of the foam core layer under the support of the thin-walled single plate buckling coefficient K, instead of winter effective width formulas of buckling coefficient can as pressing type surface sandwich panel is to be pressed surface plate buckling performance calculation method;
(5) completed the six pressure type surface sandwich plate specimen flexural buckling bearing force test and got sandwich panel is to be pressed surface plate buckling critical stress, buckling loads and buckling half wavelength. The theoretical values of are in good agreement with the experimental values.



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