钮鹏, 金春福. 几何缺陷影响下的CFRP-方钢管极限承载力解析解[J]. 工程力学, 2015, 32(增刊): 322-326. DOI: 10.6052/j.issn.1000-4750.2014.05.S025
引用本文: 钮鹏, 金春福. 几何缺陷影响下的CFRP-方钢管极限承载力解析解[J]. 工程力学, 2015, 32(增刊): 322-326. DOI: 10.6052/j.issn.1000-4750.2014.05.S025
NIU Peng, JIN Chun-fu. ANALYTICAL SOLUTIONS ON ULTIMATE BEARING CAPACITY OF A SQUARE CFRP-STEEL TUBE MEMBER WITH INITIAL IMPERFECTION[J]. Engineering Mechanics, 2015, 32(增刊): 322-326. DOI: 10.6052/j.issn.1000-4750.2014.05.S025
Citation: NIU Peng, JIN Chun-fu. ANALYTICAL SOLUTIONS ON ULTIMATE BEARING CAPACITY OF A SQUARE CFRP-STEEL TUBE MEMBER WITH INITIAL IMPERFECTION[J]. Engineering Mechanics, 2015, 32(增刊): 322-326. DOI: 10.6052/j.issn.1000-4750.2014.05.S025

几何缺陷影响下的CFRP-方钢管极限承载力解析解

ANALYTICAL SOLUTIONS ON ULTIMATE BEARING CAPACITY OF A SQUARE CFRP-STEEL TUBE MEMBER WITH INITIAL IMPERFECTION

  • 摘要: 该文利用计算压弯钢构件弹塑性失稳的Ježek法,推导了受轴心压弯外力作用下具有初始几何缺陷且翼缘两侧分别粘贴碳纤维片后的方钢管构件失稳时极限荷载的计算公式。通过采用数值分析法,结合非线性屈曲理论,进行了受初始几何缺陷影响的碳纤维增强方钢管构件的屈曲分析,并得到极限承载力的数值解。将数值分析结果与Ježek法得到的解析解进行比对,可以发现两种计算结果吻合的较好。由计算结果可知,当给定弯矩值时,三种构件当中碳纤维增强后的构件极限承载力始终保持较高数值。给定弯矩较小时,裸钢构件的极限承载力要高于考虑缺陷的碳纤维增强后的构件。当弯矩逐渐增加,其前者的极限承载力降低速度要快于后者。

     

    Abstract: Based on Ježek method for computing the elastic-plastic buckling of the member under axial compressive loads and the bending moments, and considering the initial imperfection, the analytical expressions are derived for calculating the ultimate load of buckling about the neutral axis with the maximum moment of inertia for a square steel tube member with flange outsides wrapped by carbon fibre. Using the elastic-plastic finite element method and the theory of nonlinear buckling, the impact by initial geometric imperfections on the square steel tube member wrapped by carbon fibre is analyzed and the numerical solutions for ultimate bearing capacity are obtained. By comparing with the values of the finite element method (FEM), it shows that the analytical method proposed is valid. The calculation results show that when the value of moment is given, only the ultimate bearing capacity of the member reinforced by the carbon fiber among the three member always keeps a higher figure. When the given moment is small, the ultimate bearing capacity of a bare steel member is higher than that of a steel member reinforced by the carbon fiber with the initial geometric imperfection. When the value of the bending moment increases gradually, the ultimate bearing capacity of the former reduces faster than the latter.

     

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