First, the paper sets up finite element models of 4-point bending RC beam strengthened with FRP sheet. Not only material nonlinear of concrete and steel bar but bond style of longitudinal steel, stirrup and FRP are taken into account.
本文首先建立了纤维布加固钢筋混凝土梁四点弯曲的有限元模型，考虑了混凝土、钢筋的材料非线性以及纵向钢筋、箍筋和纤维布与混凝土之间的联结关系。
参考来源 - 碳纤维布加固钢筋混凝土梁有限元分析及试验研究Based on these theories, the method including material nonlinear, state nonlinear (contact), harmonic response and fatigue are applied to 8 load cases of every part.
在这些方法和原理的基础上分别对每种零件的不同荷载工况（具体分为8种工况）进行了材料非线性、状态非线性（接触）、谐响应以及疲劳寿命的计算。
参考来源 - 电气化铁道接触网抱箍类零部件有限元分析·2,447,543篇论文数据，部分数据来源于NoteExpress
The model include material nonlinear, geometry nonlinear and state nonlinear.
模型包括材料非线性、几何非线性、状态非线性。
Geometry nonlinear and material nonlinear and state nonlinear and dynamic load were involved in simulating course.
在模拟过程中涉及几何非线性、材料非线性、状态非线性和动态加载等问题。
So the effect of the material nonlinear and geometry nonlinear should be considered when the stability issue is analyzed.
所以在计算稳定问题的时候，应该计入几何非线性和材料非线性的影响。
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