LOCAL BUCKLING OF COMPOSITE FRP SHAPES BY DISCRETE PLATE ANALYSIS
LOCAL BUCKLING OF COMPOSITE FRP SHAPES BY DISCRETE PLATE ANALYSIS
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DOI：
10.1061/(asce)0733-9445(2001)127:3(245
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发表时间：
2001-03
期刊：
影响因子：
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通讯作者：
P. Qiao;J. Davalos;Jialai Wang
中科院分区：
文献类型：
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作者：
P. Qiao;J. Davalos;Jialai Wang
对纤维增强塑料（FRP）结构形状的离散层合板或面板的局部屈曲进行了分析研究。拉挤FRP型材的法兰被建模为受到均匀轴向面内载荷的离散板。本文给出了两种不同边界条件和无载边弹性约束的复合材料板的分析实例。通过同时求解两个超越方程，得到了临界屈曲应力合力和临界屈曲波数随板的高宽比的变化规律。利用这种新的求解方法和回归分析，可以有效地用边界弹性约束系数来表示板屈曲应力的简化表达式。约束在法兰腹板连接的影响被认为是，并给出了明确的表达式约束系数的I和箱形截面，它表明，实际情况之间的简单支撑和完全约束（夹紧）的条件。FRP柱局部屈曲的理论预测与试验数据和有限元特征值分析吻合良好。以类似的方式，在平面内剪切载荷下FRP形状的腹板单元被建模为具有和不具有由翼缘板提供的弹性约束。该公式可用于确定沿卸载边沿着有弹性约束的层合板的局部屈曲承载力，并可进一步用于预测FRP型材（如柱和梁）的局部屈曲强度。
An analytical study of local buckling of discrete laminated plates or panels of fiber-reinforced plastic (FRP) structural shapes is presented. Flanges of pultruded FRP shapes are modeled as discrete panels subjected to uniform axial in-plane loads. Two cases of composite plate analyses with different boundary con- ditions and elastic restraints on the unloaded edges are presented. By solving two transcendental equations simultaneously, the critical buckling stress resultant and the critical value of the number of buckled waves over the plate aspect ratio are obtained. Using this new solution technique and regression analysis, simplified ex- pressions for predictions of plate buckling stress resultants are efficiently formulated in terms of coefficients of boundary elastic restraints. The effects of restraint at the flange-web connection are considered, and explicit expressions for the coefficients of restraint for I- and box-sections are given; it is shown that actual cases lie between simply supported and fully restrained (clamped) conditions. The theoretical predictions show good agreement with experimental data and finite-element eigenvalue analyses for local buckling of FRP columns. In a similar manner, web plate elements of FRP shapes under in-plane shear loads are modeled with and without elastic restraints provided by the flange panels. The present formulation can be applied to several cases to determine local buckling capacities of laminated plates with elastic restraints along the unloaded edges and can be further used to predict the local buckling strength of FRP shapes, such as columns and beams.