硫酸盐腐蚀钢筋混凝土板受弯力学性能的退化规律.pdfVIP

学兔兔 2012年第10期 混凝土与水泥制 品 2012 No．10 10月 CHINA CONCRETE AND CEMENT PRODUC 0ctober 硫酸盐腐蚀钢筋混凝土板受弯力学性能的退化规律 周效国 ，汪俊华 (1．江苏科技大学船舶与海洋工程学院，镇江212003； 2．江苏科技大学土木工程与建筑学院，镇江212003) 摘 要：通过大型非线性数值分析软件ABAQUS对受硫酸盐腐蚀后的钢筋混凝土板进行模拟分析，揭示了 ABAQUS中塑性损伤模型进行非线性模拟的有效性以及钢筋混凝土板受腐蚀后受弯性能的退化规律。通过模拟结 果和试验结果的对比，可以看出，ABAQUS非线性模拟是行之有效的。从ABAQUS模拟结果和试验结果均可看出 随着腐蚀度D的增加，板的极限承载力、延性和刚度逐渐减小，其中承栽力下降约3％-5％，延性下降约 19％~28％， 刚度下降9。96％一19．43％，而跨中挠度逐渐增大，这主要是因为随着硫酸盐的不断侵蚀，生成膨胀性物质钙矾石，板 截面的损伤不断严重，使得截面的有效抗弯高度以及弹性模量降低，最终造成板的承载力、延性、刚度的降低以及 跨中挠度的增大。 关键词：硫酸盐腐蚀；塑性损伤模型；受弯性能；腐蚀度；承载力；挠度；延性；刚度 Abstract：The la职e—sca1e nonlinear finite element software ABAQUS is used to simulate the reinforced concrete slab attacked by sulfate to reveal the effectiveness about nonlinear simulation of damaged D1astic model in ABAQUS and the flexura1 performance degradation laws of reinforced concrete slab attacked by sulfate．Compared with the simulation results and experimental results，it’S found that to use ABAQUS to simulate nonlinear performance is effective．The ultimate strength，ductility and stiffness of these slabs gradually decrease when the corrosion degree D increases，and the ultimate strength decrease about 3％-5％，the ductility declines about 19％-28％，the stiffness decline about 9．96％-19．43％， meanwhile the deflection increases because of the constant erosion of sulfate，which results in much expansive substance (Ettringite)，and the cross-sections of the slab continue to damage seriously，all these make the effective flexural height of the crDss-section and the elastic modulus decr