盐冻环境下钢筋混凝土梁抗弯性能仿真分析

采用数值模拟技术同时考虑到混凝土力学性能及钢筋混凝土粘结性能受盐冻融作用的损伤,对经历不同盐冻融循环次数后钢筋混凝土梁的抗弯性能进行了非线性分析,研究了其抗力性能受盐冻融循环作用的影响规律.结果表明:盐冻环境下梁抗弯性能退化的主要原因是由于混凝土力学性能的降低,而粘结性能退化对梁抗力性能的影响并不显著；盐冻融作用达到一定程度后钢筋混凝土梁的破坏类型会发生改变,将由适筋破坏转换为超筋破坏；梁端锚固区粘结性能的冻融损伤对梁抗力性能有一定程度的影响,尤其当冻融程度较严重时,梁的承载力较锚固良好时约有4％左右的降幅.

Simulation Analysis of Flexural Performance of Reinforced Concrete Beam in Salt-frost Environment

Considering the damage of concrete mechanical properties and bonding behavior between the steel bar and concrete after the freezing and thawing function in the numerical simulation,the nonlinear analysis on flexural performance of reinforced concrete beam which experiences different salt-frost cycles is conducted,and the evolution law of resistance performance of reinforced concrete beam is studied.It is shown that,in the salt-frost environment,the decrease of concrete mechanical properties is the main reason that causes the degeneration of RC beam on flexural performance,while the reduction of bonding property has an unobvious effect on the beam resistance performance.When the salt-frost cycles reach a certain level,the beam failure pattern would change from the under-reinforced failure to over-reinforced failure.The freeze-thaw damage of bonding property in the beam-ends anchorage zone has a certain effect on the beam resistance behavior,especially for the more serious freeze-thaw degree,the resistance performance of the beam reduces about 4% than the perfect anchor beam.