多点荷载作用下钢筋混凝土梁受力特性及损伤演化规律研究

钢筋混凝土结构因其具有较好受拉和抗压性能,在各种建筑领域中被广泛使用。钢筋混凝土结构作为现代建筑工程中广泛采用的一种关键结构形式,其在服役期间的损伤特性一直是工程领域关注的重点。该文利用ABAQUS有限元数值软件,建立多点荷载作用下钢筋混凝土梁的数值仿真计算模型,对钢筋混凝土梁的多点荷载作用下受力特性及损伤演化规律开展研究。研究发现,钢筋混凝土梁在竖向位移荷载作用过程中,拉应力集中于梁下部,压应力区在梁上部;随外部荷载持续作用,纵向受力钢筋上形成的应力会传递至环向的箍筋上;钢筋混凝土梁在纯弯段受压区处,混凝土的应变大于材料的最大压缩应变,导致受压区内的混凝土出现损伤破坏;在钢筋混凝土梁受力过程中,混凝土的强度等级和受拉钢筋的强度等级对梁体的整体强度有决定性作用。

The reinforced concrete structure has a good tensile and compression performance,so it has been widely applied in all kinds of construction fields.As one of the most important structures in modern construction projects,the damage properties of RC structures have always been concerned about in engineering field.In this paper,a numerical simulation model of RC beam under multi-point load is developed using ABAQUS FEM software.The results show that in the course of vertical displacement,the tension stress is concentrated at the bottom of the beam,while the compressive stress is located at the top of the beam;with the continuous action of external load,the stress formed on the longitudinal steel bar will be transferred to the circumferential stirrups;in the compression zone of the pure bending section of the reinforced concrete beam,the strain of the concrete is greater than the maximum compressive strain of the material,which leads to the damage and failure of the concrete in the compression area.In the stress process of reinforced concrete beam,the strength grade of concrete and the strength grade of tensile steel bar play a decisive role in the overall strength of the beam.