再生混凝土梁抗弯性能非线性有限元分析

采用有限元软件ANSYS对再生混凝土梁的抗弯性能进行非线性有限元分析。针对不同的再生粗骨料取代率和纵向受拉钢筋配筋率,在其余试件参数完全相同的情况下,研究再生混凝土梁正截面的抗弯性能。分析结果表明再生混凝土梁与普通混凝土梁的变形和裂缝开展情况基本相同,但抗弯刚度和延性存在差异。随着再生粗骨料取代率的增加,再生混凝土梁的抗弯刚度有下降的趋势,但延性有所提高。另外,随着纵向钢筋配筋率的增大,梁的抗弯承载力不断提高,但变形能力逐步下降。最后,再生混凝土梁的抗弯过程与普通混凝土梁基本相同,平截面假定仍然成立。

Nonlinear Finite Element Analysis on Flexural Behavior of Recycled Concrete Beams

This paper mainly discusses the flexural behavior of recycled concrete beams using nonlinear finite element by the software ANSYS.With the same specimen parameters but different replacement ratio of recycled coare aggregate and the percentage of vertical reinforcement,the normal section flexural behavior of recycled aggregate concrete beams were investigated.The analysis shows that the flexural rigidity of recyled concrete beam reduces,the ductility of recyled concrete beam is improved with the increase of coarse aggregate content,wherea,the deflection and crack development are similar to the natural aggregate concrete beam.In addition The flexural capacity is increased,while the deflection capacity is decreased gradually with the increase of the percentage of vertical reinforcement.Finally,the flexural process of recycled concrete beam is approximately the same to the natural aggregate concrete beam,and the plain-section presumption of ordinary concrete beam of flexure is also applied to recycled concrete beam.