【摘要】 基于ABAQUS有限元分析软件,建立了钢筋混凝土梁计算分析模型,考虑混凝土和钢筋的材料率相关性,研究不同加载速率、不同纵筋率和不同剪跨比时钢筋混凝土剪切梁的力学性能、变形性能和损伤特性。计算结果表明:随着加载速率的增加,钢筋混凝土梁的极限强度和极限位移都增加,梁的损伤和开裂加剧,梁的破坏形式由低加载速率时的弯剪破坏变化为高加载速率时的剪切破坏;纵筋率对极限承载力的影响不大,但纵筋率提高裂缝开展会更加充分;随着剪跨比的增加,钢筋混凝土梁的极限承载能力降低,极限承载力的下降幅度会随着剪跨比的增加而减小。更多还原

【Abstract】 The RC beam model was developed using the ABAQUS finite element software. The rate-dependent damage plastic model of concrete and the rate-dependent elastic-plastic model of rebar were selected in this model. The effects of loading rate,shear span ratio and longitudinal reinforcement ratio on the mechanical properties,deformation and damage characteristics of RC beams were simulated. Results show that the ultimate strength and the ultimate displacement of the RC beam increase with the increasing of loading rate,the damage and cracks of concrete developed more rapidly. The failure forms of the RC beam change from the bending-shear failure at the low loading rate to the shear failure at the high loading rate. The longitudinal reinforcement ratio has little effect on the ultimate bearing capacity,but the oblique cracks developed fully with the increase of longitudinal reinforcement. With the increase of shear span ratio,the ultimate bearing capacity of RC beam decreases,and the shear span ratio is greater,the ultimate bearing capacity reduces smaller.更多还原