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为了研究碳纤维增强复合材料(CFRP)筋混凝土梁的非线性力学性能,基于非线性理论推导了CFRP筋梁的有限元分析模型:对4个预应力CFRP筋混凝土梁进行了非线性全过程分析,考察了预应力CFRP筋、GFRP筋和普通钢筋的应力发展规律。与试验资料对比可知,计算结果与试验数据吻合良好,说明采用弥散裂缝模式、Owen屈服准则和Hinton压碎准则能较好地描述混凝土开裂、屈服和压碎特性,同时也说明了CFRP筋及其力学效应用组合单元模拟的有效性以及本文中研制程序的正确性。CFRP筋具有高强度性能,梁试件破坏时CFRP筋均未失效;与受拉区配筋为钢筋相比,GFRP筋在全过程中处于弹性阶段。
In order to study the nonlinear mechanical properties of CFRP reinforced concrete beams, the finite element analysis model of CFRP beams is deduced based on the nonlinear theory. The nonlinear full-process analysis of four prestressed CFRP reinforced concrete beams is carried out. The stress development of prestressed CFRP bars, GFRP bars and ordinary bars were investigated. Compared with the experimental data, the calculated results are in good agreement with the experimental data, indicating that the use of diffusion fracture mode, Owen yield criterion and Hinton crushing criterion can better describe the cracking, yielding and crushing properties of concrete, and also shows that CFRP tendons and their The effectiveness of the combination of mechanic effect with the unit and the correctness of the developed procedure in this paper. The CFRP tendons have high strength performance, and the CFRP tendons did not fail in the failure of the beam specimens. Compared with the reinforcement in the tension zone, the GFRP tendons are in the elastic phase in the whole process.