腐蚀与荷载作用下高强钢筋RPC梁精细化模拟

Refined Simulation of High-Strength Reinforced RPC Beams under Corrosion and Load Condition

摘要:

随着高强钢筋和高性能混凝土在钢筋混凝土结构中的扩大应用，钢筋锈蚀对混凝土结构耐久性的影响不容忽视。为了揭示高强钢筋和RPC材料对钢筋混凝土梁构件耐久性退化的影响，首先，采用数值模拟方法，将2种混凝土（RPC和C60）、2种钢筋（HTRB600和HRB400）进行组合，形成HRPC、LRPC和HRC这3种类型的钢筋混凝土梁；其次，以锈蚀时间（0、30、60、90、120 d）为变量，引入了考虑锈蚀效应的材料性能退化模型，以模拟在腐蚀和荷载耦合作用下的结构承载力劣化情况；最后，将仿真计算结果与试验数据进行比较，验证了仿真计算方法的可靠性。

Abstract:

With the expanding application of high-strength rebar and high-performance concrete in reinforced concrete structures, the impact of rebar corrosion on the durability of concrete structures cannot be overlooked. To reveal the influence of high-strength rebar and RPC materials on the durability degradation of reinforced concrete beams, firstly the numerical simulation method is adopted to combine two types of concrete (RPC and C60) and two types of rebar (HTRB600 and HRB400), forming three types of reinforced concrete beams (HRPC, LRPC and HRC). And then, taking corrosion time (0, 30, 60, 90 and 120 d) as variables, a material performance degradation model considering the effects of corrosion is introduced to simulate the deterioration of structural load-bearing capacity under the coupled effects of corrosion and loading. Finally, the simulation results are compared with experimental data to validate the reliability of the simulating calculation method.