不同厚度钢板加固RC梁受力性能的数值模拟研究

Numerical Simulation Study of Mechanical Properties of RC Beams Reinforced with Steel Plates of Different Thicknesses

钢筋混凝土梁的变形与受力性能与结构的服役环境关系密切,在严酷的自然环境中,混凝土结构常发生劣化而影响其正常使用。本文采用ABAQUS非线性数值模拟方法,开展了不同厚度钢板(Q235钢材)加固钢筋混凝土梁的应力和位移。分析结果表明在梁底粘贴钢板可显著增强混凝土梁的抵抗变形能力,而钢板厚度是影响混凝土梁变形的主要参数。;粘贴钢板所形成的复合截面能够有效降低混凝土的拉伸损伤程度,并有效限制混凝土裂缝的开展,同时也显著降低了纵向受拉钢筋的应力。

The deformation and mechanical properties of reinforced concrete beams are closely related to the service environment of the structure.In the harsh natural environment,the concrete structure often deteriorates and affects its normal use.In this paper,the ABAQUS nonlinear numerical simulation method is used to carry out the stress and displacement of reinforced concrete beams strengthened by steel plates(Q235 steel)with different thicknesses.The analysis results show that sticking steel plate at the bottom of the beam can significantly enhance the deformation resistance of the concrete beam,and the thickness of the steel plate is the main parameter affecting the deformation of the concrete beam.The composite section formed by pasting steel plates can effectively reduce the tensile damage of concrete,effectively limit the development of concrete cracks,and also significantly reduce the stress of longitudinal tensile steel bars.