基于损伤理论的钢筋混凝土拱结构破坏过程的数值模拟

NUMERICAL SIMULATION OF FAILURE PROCESS OF REINFORCED CONCRETE ARCH BY DAMAGE THEORY

从一服役28年的旧拱桥上拆下来两个钢筋混凝土拱肋,对其进行了静载破坏试验。将第一作者提出的弹性损伤理论与有限元法相结合,针对钢筋混凝土结构的破坏问题,建立了相应的损伤力学有限元数值计算方法,编制了相应的计算机程序。对钢筋混凝土拱肋的破坏过程进行了数值模拟计算。拱的破坏模式、位移与应变的理论计算结果与试验结果吻合良好。得出了混凝土材料损伤特性参数的数值,揭示了混凝土材料破坏过程中一些复杂的力学行为。在较大的荷载水平下,钢筋混凝土结构呈明显的非线性特征。研究表明,本文损伤模型可以较好地描述混凝土材料的损伤与破坏行为。

Two reinforced concrete arches, which have been in service for 28 years, were removed from an old bridge to the laboratory. Failure experiments were performed. Combining the elastic damage theory with the finite element method proposed by the first author, a numerical method and a computer program are developed to simulate the failure process of the RC arch structures. The theoretical results of the failure mode, displacements and strains of the arch structure are in good agreement with the experimental observations. The concrete damage parameters are obtained. Numerical results reveal the complicated behavior of concrete in a damaging process. The reinforced concrete structures exhibit pronounced nonlinearity at large loading levels. The elastic damage theory is valid to describe the damage and fracture behavior of concrete.