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在外表面粘结纤维增强复合板材或钢板能提高钢筋混凝土、金属、木构件的强度或刚度。板材与被加固构件之间的剥离是常出现的破坏模式,而剥离主要取决于构件和薄板之间粘结层的界面应力。采用有限元分析法对界面应力进行预测,研究主要聚焦在非均匀分布荷载的简支梁。基于对梁、粘结层、板的不同假设,采用5个不同的有限元模型对界面应力进行描述。将5种方法的预测值进行相互对比,并与不同组合水平下的解析解进行对比。比较结果清楚显示了每个假设对所预测的界面应力的影响。对于复杂的粘接薄板构件,梁-弹簧-梁模型可以简单、精确地预测界面应力和剥离破坏。为说明梁-弹簧-梁模型的通用性,用相同的模型得到两个更复杂构件的界面应力并进行讨论。
Bonding fiber-reinforced composite sheets or sheets to outer surfaces can increase the strength or stiffness of reinforced concrete, metal, wood components. Peeling between the plate and the member to be reinforced is a failure mode that often occurs, and peeling mainly depends on the interfacial stress of the adhesive layer between the member and the plate. The interfacial stress is predicted by the finite element analysis method, and the simple supported beam with the non-uniform distribution load is mainly studied. Five different FE models are used to describe the interfacial stress based on different assumptions of beams, bonding layers and plates. The predicted values of the five methods are compared with each other and compared with the analytical solutions at different combinations. The results of the comparison clearly show the impact of each hypothesis on the predicted interfacial stress. For complex bonded sheet metal components, the beam-spring-beam model can predict interfacial stress and peel failure simply and accurately. To illustrate the versatility of the beam-spring-beam model, the interfacial stresses of two more complex components are obtained using the same model and discussed.