【摘要】 粘贴碳纤维增强复合材料(CFRP)板能有效提高钢-混凝土组合梁的强度和刚度.文中采用非线性有限元方法分析了简支CFRP板加固钢-混凝土组合梁的极限承载力和刚度,并对非线性有限元模型中胶层和栓钉连接层的影响进行了研究.将非线性有限元分析结果、理论公式计算结果和试验结果进行分析和比较,发现:(1)非线性有限元分析得到的应力-应变曲线及CFRP板的纵向应变与试验结果吻合较好;(2)考虑连接层的非线性有限元模型比不考虑连接层的具有更高的精度;(3)CFRP板的性能在钢梁屈服后才得到充分发挥;(4)与其他方法相比,由考虑连接层非线性有限元模型计算得到的抗弯极限承载力最接近试验结果,误差小于2.5%.更多还原

【Abstract】 It has been confirmed that an externally-bonded carbon fibre-reinforced polymer(CFRP) plate can effe-ctively improve the strength and stiffness of steel-concrete composite beams.In this paper,the nonlinear finite element(FE) method was used to calculate the ultimate bearing capacity and stiffness of the simply-supported CFRP strengthened composite beams,and the effects of adhesive and shear studs were also discussed.Then,the nonli-near FE results were compared with the theoretical and experimental ones.Analytical results indicate that(1) both the stress-strain curve and the longitudinal strain of CFRP plate obtained by nonlinear FE analysis are in good agreement with the experimental ones;(2) the nonlinear FE model considering the joint is more accurate than the one not considering the joint;(3) The effect of CFRP is not significantly displayed until the steel beam yields;and(4) as compared with the results obtained by other analytical methods,the results obtained by the nonlinear FE model considering the joint are more close to the experimental ones,with an error of less than 2.5%.更多还原