CFRP约束混凝土圆柱轴心受压力学性能分析

采用基于非相关联流动法则的混凝土Drucker-Prager模型,对碳纤维增强复合材料（CFRP）约束混凝土圆柱的轴压受力性能进行了非线性有限元计算,分析了CFRP厚度、CFRP缠绕角度和混凝土强度3种因素对柱轴压力学性能的影响。结果表明：采用非相关联流动法则计算得到的数值结果与试验结果吻合良好;随CFRP厚度增加,柱的极限压应力和压应变均增大;CFRP环向缠绕比成角度缠绕的混凝土柱能获得更大的极限压应力;混凝土强度越低,CFRP的约束效率越高。

Mechanical Properties of Concrete Cylinders Confined with CFRP Sheets Subjected to Axial Compression

Based on Drucker-Prager criterion with non-associated flow rule,numerical analysis of mechanical properties of concrete cylinders were carried out by using non-linear finite element method.The effect caused by various parameters such as wrap thickness,fiber orientation and concrete strength on axial mechanical properties of concrete cylinders is discussed.The results show that the results calculated by non-associated flow rule conform to that in the test.It is demonstrated that there is significant enhancement both in compressive strength and ductility of cylinders with the increase of wrap thickness.Moreover,the gain in axial compressive strength is observed to be higher for lower strength concrete and be highest in the cylinders wrapped with the hoop orientation.